Patent Application
20250091332
Eastar™ DN 010 (DN 010): poly- or copolycondensate of a terephthalic acid composed of 54.9% by weight of terephthalic acid, 9.3% by weight (38 mol % based on the diol component) of ethylene glycol and 35.8% by weight (62 mol % based on the diol component) of cyclohexane-1,4-dimethanol, having an inherent viscosity of 0.74 dl/g (measured in a 1:1 mixture of phenol and tetrachloroethane at 25° C.) from Eastman Chemical Company.
Pocan™ B 1600 (PBT 1600): unmodified polycondensate of terephthalic acid and butane-1,4-diol as the diol component having a melt volume rate (MVR) of 14 g/10 min according to ISO 1133 at 260° C. and 2.16 kg from Lanxess AG.
Makrolon™ 3108: high-viscosity amorphous thermoplastic bisphenol A polycarbonate from Covestro AG having an MVR of 6.5 g/10 min according to ISO 1133-1:2011 at 300° C. and 1.2 kg applied weight and a Vicat softening temperature (VST) according to ISO 306:2004 method B120 at 50 N; 120° C./h of 150° C. and a glass transition temperature Tg according to ISO 11357-1,-2 of 149° C.
KRONOS™ 2230: titanium dioxide from Kronos for polycarbonate and other industrial thermoplastics having a TiO2 content of ≥96%.
149.0 g (0.65 mol) of bisphenol A (2,2-bis(4-hydroxyphenyl)propane), 107.9 g (0.35 mol) of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 336.6 g (6 mol) of KOH and 2700 g of water were dissolved with stirring in an inert gas atmosphere. A solution of 1.88 g of phenol in 2500 ml of methylene chloride was then added. 198 g (2 mol) of phosgene were introduced into the well-stirred solution at pH 13 to 14 and 21° C. to 25° C. Thereafter, 1 ml of ethylpiperidine was added and the mixture was stirred further for 45 min. The bisphenoxide-free aqueous phase was removed and the organic phase, after acidification with phosphoric acid, was washed with water until neutral and freed of solvent. The polycarbonate exhibited a relative solution viscosity of 1.255, determined according to DIN EN ISO 1628-1:2009. The Vicat softening temperature of the polymer was determined as 183° C. according to ISO 306:2004 method B120 at 50 N; 120° C./h.
Analogously to PC 1, a mixture of 91.6 g (0.40 mol) of bisphenol A and 185.9 g (0.60 mol) of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane was reacted to give the corresponding polycarbonate 2. The polycarbonate exhibited a relative solution viscosity of 1.251, determined according to DIN EN ISO 1628-1:2009.
The Vicat softening temperature of the polymer was determined as 204° C. according to ISO 306:2004 method B120 at 50 N; 120° C./h.
Analogously to PC 1, a mixture of 44.2 g (0.19 mol) of bisphenol A and 250.4 g (0.81 mol) of 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane was reacted to give the corresponding polycarbonate.
The polycarbonate exhibited a relative solution viscosity of 1.248, determined according to DIN EN ISO 1628-1:2009.
The Vicat softening temperature of the polymer (P1) was determined as 216° C. according to ISO 306:2004 method B120 at 50 N; 120° C./h.
The batches for the production of a white layer were produced using a conventional twin-screw compounding extruder (ZSK 32) at processing temperatures of 250 to 330° C.
Batches having the compositions according to table 1 were compounded and then pelletized:
The system used consists of
The pellet material of a polymer (P3) was supplied to the extruder hopper. The respective material was melted and conveyed in the respective barrel/screw plasticizing system. The material melt was supplied to the die. The melt passed from the die onto the smoothing calendar. On the smoothing calendar, the material underwent final shaping and cooling to give a polymer layer (S3) that can serve as a substrate or intermediate layer. Structuring of the film surfaces was achieved using a matt steel roller (no. 4 surface) and a matt rubber roller (no. 4 surface). The film or layer (S3) was subsequently transported through a take-off and then the layer (S3) was wound up. The corresponding white opaque extrusion layers were produced according to table 2 in this way.
The masterbatch that was used for the production of the laserable polymer layer(s) was produced using a conventional twin-screw compounding extruder (ZSK 32) at processing temperatures of 250 to 330° C.
A masterbatch having the following composition was compounded and subsequently pelletized:
The system used consists of
The pellet material of the base material was supplied to the hopper of the main extruder. The respective material was melted and conveyed in the form of the polymers (P1) or (P2) in the respective barrel/screw plasticizing system. Both material melts were combined in the coextrusion die. The melt passed from the die onto the smoothing calendar. On the smoothing calendar, the material underwent final shaping and cooling. Structuring of the film surfaces was achieved using a structured metal roller (no. 6 surface) and a structured rubber roller (no. 2 surface). The film was subsequently transported through a take-off and then the film was wound up as a multilayer construction (MA) according to the invention.
The compositions of the films of the examples are described in tables 4 and 5.
For the production of three-layer multilayer constructions (MA), the procedure was exactly as described for the two-layer constructions, with the difference that the melt of the polymer (P1) was divided into two strands and fed into the die on both sides of the strand of polymer (P2), so as to obtain a multilayer construction (MA) having the layers (S1)-(S2)-(S6).
The ID documents were laminated according to the layer construction of tables 6 and 7 as follows: A stack was in each case formed from the films in the stated sequence and the lamination was performed on a Melzer roll laminator using the following parameters.
For the multilayer constructions according to the invention, 50 or 100 μm thick layers from examples 9 to 19 as described in table 6 are used. When producing the reference multilayer construction, items 1 and 8 are replaced by items 2 and 7 in the respectively appropriate number. Furthermore, when producing the reference multilayer construction, items 3, 4, 5 and 6 can also be replaced by a layer from example 7a.
The roll laminator has 2 upper and 2 lower standard ID 3-format lamination belts having a width of approx. 120 mm each. Each of the belts has two heating regions and one cooling region (each heating region with 3 heating elements and therebetween a cooling region with 6 cooling elements). Each of the belts has a heating region and a cooling region and can be heated or cooled separately and comes into contact each with an outer layer of the multilayer construction plus substrate in the form of the polymer layer (S4). Preferably, the two upper lamination belts come into contact with the polymer layer (S1) and the two lower lamination belts with the polymer layer (S4). The lamination belts each have a heating unit M330 and a cooling unit M220. The two upper lamination belts were heated to temperature (T1) as indicated in table 7. The two lower lamination belts were heated to a temperature lower than (T1), as also indicated in table 7. The cooling units are arranged in each case after a heating unit. The residence times are also listed in table 7. The transit times used in tests 20 to 29 and reference test 1 of 2×8 seconds (examples 20 to 29) or 2×14 seconds in reference test 1 2 from table 7 were used when calculating the heat flows and heat inputs into the polymer layers (1) or (5). The width and length of the heating zones—i.e. the areas (0.12 m×2 m=0.24 m2)—are the same in reference test 1 as in the tests 20 to 29 according to the invention.
A mean heat flow of 11.47 J/s was used for reference test 1 from table 7. With a contact area of the laminate with the rolls of 0.24 m2, this corresponds to a mean heat input onto the upper side of the respective reference laminate of 47.8 J/s*m2 (heat flow/area 11.47 J/s: 0.24 m2=47.8 J/s*m2).
For the tests 20 to 29, the mean heat flow was 52.7 J/s and the heat input calculated therefrom was calculated from heat flow/area as 219.6 J/s*m2 (52.7 J/s: 0.24 m2=219.6 J/s*m2).
The average value was used for the heat input, as the initial flow of heat is very high starting from an initial temperature of 25° C. and continuously decreases as the contact temperatures of 176° C. to 209° C. are approached.
Due to the higher temperature (T1) that can be used on the side of the polymer layer (S1) without the latter melting to such an extent that it displays morphological changes, in contrast to the conventional polymer layers as shown for the reference tests, a markedly increased throughput number could be achieved when producing the ID cards. The number of pieces could be increased from 2616 per hour with conventional material to 4100 per hour. This could be raised still if the speed of the lamination belts could be increased further. Thus, the maximum number of pieces possible on the system of 4100 pieces/hour was already achieved with a temperature (T1) of 190° C., and the material still showed no structural changes whatsoever, for example in the form of bubble formation, even at 220° C. All multilayer constructions (MA) according to the invention could be laminated much faster than the reference laminates without loss of adhesive force. The lamination time could be halved, entailing a doubling of the productivity of the roll lamination line.
FIG. 2 schematically illustrates the method according to the invention. In step i) 100, the first polymer layer in the form of the first outer layer (S1), the core layer (S3), the polymer layer (S4) and the second outer layer (S5) was provided rolled up on a roll so that it could be guided from the roll to the lamination belt of the laminating machine. In step ii) 200, the layers (S1), (S2), (S3), (S4), (S5) and optionally (S6) were arranged with respect to one another in such a way that the layers (S1) and (S5) formed the outer layers and all layers could be guided parallel to one another onto the lamination belt of the laminating machine. A further polymer layer (S6) was optionally provided rolled up on a roll so that it could be introduced between the polymer layers (S1) and (S2). In step iii) 300, the laminate was formed at a temperature of between 185 and 200° C. as listed in table 7. The lamination belt moved at a speed of 0.1 m/s. In an optional step iv) 400, the laminate is wound onto a roll.
| Number | Date | Country | Kind |
|---|---|---|---|
| 21185507.7 | Jul 2021 | EP | regional |
The invention relates to a multilayer construction comprising at least five layers (S1) to (S5), wherein the outer layers (S1) and (S5) independently of one another contain a polymer (P1) that has a Vicat softening temperature ≥149° C. Multilayer constructions are mainly used in the field of security documents. For the field of security documents, in particular identification documents, the embedding of a plurality of security features is absolutely necessary, in particular to guarantee the originality of these security documents. Such security documents, in particular identification documents, increasingly comprise polycarbonate. Documents based on polycarbonate are particularly durable and exhibit a high level of security against counterfeiting. Popular security features are transparent regions in, for example, identification cards or in data pages of passports. These transparent regions are also known as “windows”. Holograms, security marks and other elements which are identifiable as an original or a counterfeit by visual inspection may be introduced into these windows. The functioning of the security feature is based on the high transparency of polycarbonate. If the transparency of the document in the window is impaired then said document may be a counterfeit. The reason for this is as follows: When a further transparent film, for example containing false personal information, is stuck over the document, the change in the window is clearly apparent. The window appears less clear when looking through it. The clarity of the window is likewise disturbed by attempts to open and re-bond the document. When producing security documents, the large number of security features to be incorporated means that in the meantime it is a complex matter to select the correct material combinations in order to be able to implement the features while on the other hand providing rapid production possibilities, since bottlenecks are still encountered during the production thereof. Accordingly, there is a great need in the industry to deliver the complex manufacture of the documents as rapidly and as efficiently as possible. An object of the present invention was therefore that of minimizing at least one of the problems mentioned. Furthermore, an object of the invention was that of finding and using a combination of materials which, on the one hand, enable complex security features to be incorporated into the layer construction, and, on the other hand, enable a cost-efficient and rapid production. The invention firstly provides a multilayer construction (MA), comprising (S1) at least one first outer layer (S1) which contains a polymer (P1) that has a Vicat softening temperature of ≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 306:2004 (50 N; 50°/h)(S2) at least one further polymer layer (S2) which contains a polymer (P2) that has a Vicat softening temperature of <149° C., preferably ≤140° C., more preferably ≤130° C., determined according to ISO 306:2004 (50 N; 50°/h), preferably within a range from 120 to 148° C.;(S3) at least one core layer (S3);(S4) at least one further polymer layer (S4) which contains a polymer (P2) that has a Vicat softening temperature of <149° C., preferably ≤140° C., more preferably ≤130° C., determined according to ISO 306:2004 (50 N; 50°/h), preferably within a range from 120 to 148° C.;(S5) at least one second outer layer (S5) which contains a polymer (P1) that has a Vicat softening temperature of ≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 306:2004 (50 N; 50°/h). The multilayer construction (MA) according to the invention solves the problem of high complexity touched upon above by firstly ensuring through the choice of the materials that the adhesion of the layers to one another is sufficient for them not to readily become detached from each other, and at the same time a very wide variety of security features, such as holograms, windows or laser printing, can be incorporated into a security document, for example. Preferably, the multilayer construction (MA) is a constituent of a security document or is the security document itself, in particular is the data page of a passport or is a personal identity card or other ID cards. Depending on which material is used to construct the core layer (S3) and on how heat-sensitive this layer is, the multilayer construction (MA) may additionally have the further polymer layer (S6). The use of the further polymer layer (S6) can help protect heat-sensitive layers that are located in the multilayer construction (MA) from excessively high temperatures during a lamination process. All layers (S1) to (S6) are hereinafter also denoted as polymer layers (S1) to (S6), since they preferably contain or consist of polymers. Thus, the outer layers (S1) and (S5) are also denoted hereinafter as polymer layers (S1) and (S5), these always being the outer layers. The polymer (P1) can be any polymer that has a Vicat softening temperature of ≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 306:2004 (50 N; 50°/h) and would be selected for the multilayer construction (MA) by a person skilled in the art. An opening in the form of a window can in addition be introduced in the multilayer construction (MA) and in particular in the case of security documents offers the possibility of introducing one or more security features at that location. In order to make security features located in the multilayer construction (MA) visible, at least the polymer layers (S1) and (S2) are transparent. The polymer layers (S1), (S2), (S4) and (S5) and optionally also (S6) preferably have a light transmittance in the visible range of within a range from ≥85% to ≤98%, preferably from ≥87% to ≤95%, determined according to ISO 13468-2:2006-07. The window is preferably located only in the core layer (S3). The core layer (S3) can include any material that a person skilled in the art would select for the purpose. Preferably, the core layer (S3) includes a polymer (P3). The polymer (P3) is preferably a thermoplastic. The polymer (P3) is preferably selected from the group consisting of polycarbonates or copolycarbonates based on diphenols, poly- or copolyacrylates and poly- or copolymethacrylates, for example and with preference polymethyl methacrylate (PMMA), poly- or copolymers with styrene, for example and with preference polystyrene (PS) or polystyrene acrylonitrile (SAN), thermoplastic polyurethanes and polyolefins, for example and with preference polypropylene types or polyolefins based on cyclic olefins (for example TOPAS™), poly- or copolycondensates of an aromatic dicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms, for example and with preference poly- or copolycondensates of terephthalic acid, particularly preferably poly- or copolyethylene terephthalate (PET or CoPET), glycol-modified PET (PETG), glycol-modified poly- or copolycyclohexanedimethylene terephthalate (PCTG) or poly- or copolybutylene terephthalate (PBT or CoPBT), preferably poly- or copolycondensates of naphthalenedicarboxylic acid, particularly preferably polyethylene glycol naphthalate (PEN), poly-or copolycondensate(s) of at least one cycloalkyldicarboxylic acid, for example and with preference polycyclohexanedimethanolcyclohexanedicarboxylic acid (PCCD), polysulfones (PSU), polyvinyl halides, for example and with preference polyvinyl chloride (PVC), and mixtures of at least two of these. The core layer (S3) may include additions such as fillers, dyes, pigments, UV stabilizers and other additives, as also stated below in connection with the polymer layer (S1) or (S2). The core layer (S3) preferably has a light transmittance in the visible range of within a range from ≥85% to ≤98%, determined according to ISO 13468-2:2006-07. Alternatively, the core layer may configured to be translucent or opaque. This can for example be achieved by adding fillers, such as scattering particles or pigments such as carbon black, titanium dioxide, zirconium dioxide or barium sulfate. In this case, the core layer includes the filler in an amount within a range from 2% to 45% by weight, particularly preferably from 5% to 30% by weight, based on the total weight of the core layer (S3). The core layer (S3) preferably has a layer thickness in the range from ≥100 μm to ≤750 μm, preferably from ≥200 μm to ≤700 μm, particularly preferably from ≥30 μm to ≤600 μm. The core layer (S3) preferably has at least one opening. The at least one opening can have different shapes and sizes, and the opening in the core layer (S3) preferably has a circular or elliptical shape. The opening in the core layer (S3) is preferably introduced into the core layer (S3) by punching with a suitable tool by methods known to those skilled in the art. Alternatively, the opening can also be introduced into the core layer (S3) by means of a laser, for example an Nd:YAG laser (neodymium-doped yttrium aluminum garnet laser). The opening in the core layer (S3) is preferably not additionally filled with a thermoplastic material. In a preferred embodiment of the multilayer construction (MA), the polymer (P1) is selected from the group consisting of a polycarbonate, a copolycarbonate, and mixtures of at least two of these. The polymer (P1) for the polymer layers (S1) and (S5) is preferably selected independently of each other. The polymer (P1) for the polymer layer (S1) may differ from the polymer (P1) of the polymer layer (S5). Alternatively, the polymer (P1) of the polymer layer (S1) may be the same as for the polymer layer (S5). The polymer (P1) is preferably selected from the group consisting of aliphatic or aromatic polycarbonates or copolycarbonates. Suitable poly- or copolycarbonates are preferably aromatic polycarbonates or copolycarbonates. The polycarbonates or copolycarbonates may be linear or branched in known fashion. These polycarbonates or copolycarbonates may be prepared in known fashion from diphenols, carbonic acid derivatives, optionally chain terminators and optionally branching agents. Details of the preparation of polycarbonates and copolycarbonates have been set out in many patent specifications over the past 40 years or so. Reference may be made here merely by way of example to Schnell, “Chemistry and Physics of Polycarbonates”, Polymer Reviews, Volume 9, Interscience Publishers, New York, London, Sydney 1964, to D. Freitag, U. Grigo, P. R. Müller, H. Nouvertné, BAYER AG, “Polycarbonates” in Encyclopedia of Polymer Science and Engineering, Volume 11, Second Edition, 1988, pages 648-718 and finally to Dres. U. Grigo, K. Kirchner and P. R. Müller, “Polycarbonate” [Polycarbonates] in Becker/Braun, Kunststoff-Handbuch [Plastics Handbook], volume 3/1, Polycarbonate, Polyacetale, Polyester, Celluloseester [Polycarbonates, Polyacetals, Polyesters, Cellulose Esters], Carl Hanser Verlag Munich, Vienna 1992, pages 117-299. In the “Encyclopedia of Polymer Science and Technology”, John Wiley & Sons, Inc., by Daniel J. Brunelle, the article “Polycarbonates” on pages 1 to 33 describes not only the preparation of suitable polycarbonates or copolycarbonates but particularly in table 3 on pages 10 to 13 describes aromatic polycarbonates based on bisphenols. Suitable diphenols may, for example, be dihydroxyaryl compounds of general formula (I), HO—Z—OH (I)in which Z is an aromatic radical which has 6 to 34 carbon atoms and may contain one or more optionally substituted aromatic rings and aliphatic or cycloaliphatic radicals or alkylaryls or heteroatoms as bridging elements. Examples of suitable dihydroxyaryl compounds include: dihydroxybenzenes, dihydroxydiphenyls, bis(hydroxyphenyl)alkanes, bis(hydroxyphenyl)cycloalkanes, bis(hydroxyphenyl)aryls, bis(hydroxyphenyl) ketones, bis(hydroxyphenyl) sulfones, bis(hydroxyphenyl) sulfoxides, and also the ring-alkylated and ring-halogenated compounds thereof. These and further suitable other dihydroxyaryl compounds are described, for example, in DE-A 3 832 396, FR-A 1 561 518, in H. Schnell, Chemistry and Physics of Polycarbonates, Interscience Publishers, New York 1964, p. 28 ff; p. 102 ff, and in D. G. Legrand, J. T. Bendler, Handbook of Polycarbonate Science and Technology, Marcel Dekker New York 2000, p. 72 ff. Preferred dihydroxyaryl compounds are, for example, resorcinol, 4,4′-dihydroxydiphenyl, bis(4-hydroxyphenyl)methane, bis(3,5-dimethyl-4-hydroxyphenyl)methane, bis(4-hydroxyphenyl)-diphenylmethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, 1,1-bis(4-hydroxyphenyl)-1-(1-naphthyl)ethane, 1,1-bis(4-hydroxyphenyl)-1-(2-naphthyl)ethane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 2,2-bis(4-hydroxyphenyl)-1-phenylpropane, 2,2-bis(4-hydroxyphenyl)-hexafluoropropane, 2,4-bis(4-hydroxyphenyl)-2-methylbutane, 2,4-bis(3,5-dimethyl-4-hydroxyphenyl)-2-methylbutane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(3,5-dimethyl-4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-4-methylcyclohexane, 1,3-bis[2-(4-hydroxyphenyl)-2-propyl]benzene, 1,1′-bis(4-hydroxyphenyl)-3-diisopropylbenzene, 1,1′-bis(4-hydroxyphenyl)-4-diisopropylbenzene, 1,3-bis[2-(3,5-dimethyl-4-hydroxyphenyl)-2-propyl]benzene, bis(4-hydroxyphenyl) sulfone, bis(3,5-dimethyl-4-hydroxyphenyl) sulfone and 2,2′,3,3′-tetrahydro-3,3,3′,3′-tetramethyl-1,1′-spirobi[1H-indene]-5,5′-diol or mixtures of at least two of these. Particularly preferred dihydroxyaryl compounds are resorcinol, 4,4′-dihydroxydiphenyl, bis(4-hydroxyphenyl)diphenylmethane, 1,1-bis(4-hydroxyphenyl)-1-phenylethane, bis(4-hydroxy-phenyl)-1-(1-naphthyl)ethane, bis(4-hydroxyphenyl)-1-(2-naphthyl)ethane, 2,2-bis(4-hydroxyphenyl)propane, 2,2-bis(3,5-dimethyl-4-hydroxyphenyl)propane, 1,1-bis(4-hydroxyphenyl)cyclohexane, 1,1-bis(3,5-dimethyl-4-hydroxyphenyl)cyclohexane, 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane, 1,1′-bis(4-hydroxyphenyl)-3-diisopropylbenzene and 1,1′-bis(4-hydroxyphenyl)-4-diisopropylbenzene, or mixtures of at least two of these. Very particularly preferred dihydroxyaryl compounds are 4,4′-dihydroxydiphenyl and 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane. It is possible to use either one dihydroxyaryl compound to form homopolycarbonates or different dihydroxyaryl compounds to form copolycarbonates. It is possible to use either one dihydroxyaryl compound of formula (I) or (Ia) (formulae shown below) to form homopolycarbonates or two or more dihydroxyaryl compounds of formula(e) (I) and/or (Ia) to form copolycarbonates. The various dihydroxyaryl compounds may be connected together in random or blockwise fashion. In the case of copolycarbonates composed of dihydroxyaryl compounds of formulae (I) and (Ia), the molar ratio of dihydroxyaryl compounds of formula (Ia) to the other dihydroxyaryl compounds of formula (I) that are optionally usable as well is preferably between 99 mol % of (Ia) to 1 mol % of (I) and 2 mol % of (Ia) to 98 mol % of (I), preferably between 99 mol % of (Ia) to 1 mol % of (I) and 10 mol % of (Ia) to 90 mol % of (I), and especially between 99 mol % of (Ia) to 1 mol % of (I) and 30 mol % of (Ia) to 70 mol % of (I). A very particularly preferred copolycarbonate can be prepared using 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane and dihydroxyaryl compounds of formulae (Ia) and (I). Suitable carbonic acid derivatives may, for example, be diaryl carbonates of general formula (II) in whichR, R′ and R″ are the same or different and are independently hydrogen, linear or branched C1-C34-alkyl, C7-C34-alkylaryl or C6-C34-aryl, R may additionally also be —COO—R′″ where R′″ is hydrogen, linear or branched C1-C34-alkyl, C7-C34-alkylaryl or C6-C34-aryl. Preferred diaryl carbonates are, for example, diphenyl carbonate, methylphenyl phenyl carbonates and di(methylphenyl) carbonates, 4-ethylphenyl phenyl carbonate, di(4-ethylphenyl) carbonate, 4-n-propylphenyl phenyl carbonate, di(4-n-propylphenyl) carbonate, 4-isopropylphenyl phenyl carbonate, di(4-isopropylphenyl) carbonate, 4-n-butylphenyl phenyl carbonate, di(4-n-butylphenyl) carbonate, 4-isobutylphenyl phenyl carbonate, di(4-isobutylphenyl) carbonate, 4-tert-butylphenyl phenyl carbonate, di(4-tert-butylphenyl) carbonate, 4-n-pentylphenyl phenyl carbonate, di(4-n-pentylphenyl) carbonate, 4-n-hexylphenyl phenyl carbonate, di(4-n-hexylphenyl) carbonate, 4-isooctylphenyl phenyl carbonate, di(4-isooctylphenyl) carbonate, 4-n-nonylphenyl phenyl carbonate, di(4-n-nonylphenyl) carbonate, 4-cyclohexylphenyl phenyl carbonate, di(4-cyclohexylphenyl) carbonate, 4-(1-methyl-1-phenylethyl)phenyl phenyl carbonate, di[4-(1-methyl-1-phenylethyl)phenyl]carbonate, biphenyl-4-yl phenyl carbonate, di(biphenyl-4-yl) carbonate, 4-(1-naphthyl)phenyl phenyl carbonate, 4-(2-naphthyl)phenyl phenyl carbonate, di[4-(1-naphthyl)phenyl]carbonate, di[4-(2-naphthyl)phenyl]carbonate, 4-phenoxyphenyl phenyl carbonate, di(4-phenoxyphenyl) carbonate, 3-pentadecylphenyl phenyl carbonate, di(3-pentadecylphenyl) carbonate, 4-tritylphenyl phenyl carbonate, di(4-tritylphenyl) carbonate, (methyl salicylate) phenyl carbonate, di(methyl salicylate) carbonate, (ethyl salicylate) phenyl carbonate, di(ethyl salicylate) carbonate, (n-propyl salicylate) phenyl carbonate, di(n-propyl salicylate) carbonate, (isopropyl salicylate) phenyl carbonate, di(isopropyl salicylate) carbonate, (n-butyl salicylate) phenyl carbonate, di(n-butyl salicylate) carbonate, (isobutyl salicylate) phenyl carbonate, di(isobutyl salicylate) carbonate, (tert-butyl salicylate) phenyl carbonate, di(tert-butyl salicylate) carbonate, di(phenyl salicylate) carbonate and di(benzyl salicylate) carbonate. Particularly preferred diaryl compounds are diphenyl carbonate, 4-tert-butylphenyl phenyl carbonate, di(4-tert-butylphenyl) carbonate, biphenyl-4-yl phenyl carbonate, di(biphenyl-4-yl) carbonate, 4-(1-methyl-1-phenylethyl)phenyl phenyl carbonate, di[4-(1-methyl-1-phenylethyl)phenyl]carbonate and di(methyl salicylate) carbonate. Diphenyl carbonate is very particularly preferred. It is possible to use either one diaryl carbonate or different diaryl carbonates. For control or variation of the end groups, it is additionally possible to use, for example, one or more monohydroxyaryl compound(s) as chain terminators that were not used for preparation of the diaryl carbonate(s) used. These may be those of the general formula (III) whereRA is linear or branched C1-C34-alkyl, C7-C34-alkylaryl, C6-C34-aryl or —COO—RD where RD is hydrogen, linear or branched C1-C34-alkyl, C7-C34-alkylaryl or C6-C34-aryl, andRB, RC are the same or different and are independently hydrogen, linear or branched C1-C34-alkyl, C1-C34-alkylaryl or C6-C34-aryl. Preferred monohydroxyaryl compounds are 1-, 2- or 3-methylphenol, 2,4-dimethylphenol 4-ethylphenol, 4-n-propylphenol, 4-isopropylphenol, 4-n-butylphenol, 4-isobutylphenol, 4-tert-butylphenol, 4-n-pentylphenol, 4-n-hexylphenol, 4-isooctylphenol, 4-n-nonylphenol, 3-pentadecylphenol, 4-cyclohexylphenol, 4-(1-methyl-1-phenylethyl)phenol, 4-phenylphenol, 4-phenoxyphenol, 4-(1-naphthyl)phenol, 4-(2-naphthyl)phenol, 4-tritylphenol, methyl salicylate, ethyl salicylate, n-propyl salicylate, isopropyl salicylate, n-butyl salicylate, isobutyl salicylate, tert-butyl salicylate, phenyl salicylate and benzyl salicylate. Particular preference is given to 4-tert-butylphenol, 4-isooctylphenol and 3-pentadecylphenol. Suitable branching agents may be compounds having three or more functional groups, preferably those having three or more hydroxyl groups. Suitable compounds having three or more phenolic hydroxyl groups are, for example, phloroglucinol, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)hept-2-ene, 4,6-dimethyl-2,4,6-tri(4-hydroxyphenyl)-heptane, 1,3,5-tri(4-hydroxyphenyl)benzene, 1,1,1-tri(4-hydroxyphenyl)ethane, tri(4-hydroxy-phenyl)phenylmethane, 2,2-bis(4,4-bis(4-hydroxyphenyl)cyclohexyl]propane, 2,4-bis(4-hydroxy-phenylisopropyl)phenol and tetra(4-hydroxyphenyl)methane. Other suitable compounds having three or more functional groups are, for example, 2,4-dihydroxybenzoic acid, trimesic acid/trimesoyl chloride, cyanuric chloride and 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole. Preferred branching agents are 3,3-bis(3-methyl-4-hydroxyphenyl)-2-oxo-2,3-dihydroindole and 1,1,1-tri(4-hydroxyphenyl)ethane. Furthermore, the polymer layer (S1) may include additions such as fillers, dyes, pigments, UV stabilizers and other additives, as also stated below in connection with the polymer layer (S3). Preferably, the first polymer layer (S1) has transparency in the visible wavelength range, preferably in the range from ≥70% to ≤99%, preferably from ≥80% to ≤95%, particularly preferably >88% to ≤93%, determined according to ISO 13468-2:2006-07. Preferably, the further polymer layer (S2) has transparency in the visible wavelength range, preferably in the range from ≥70% to ≤99%, preferably from ≥80% to ≤95%, particularly preferably ≥88% to ≤93%, determined according to ISO 13468-2:2006-07. In a preferred embodiment of the multilayer construction (MA), the multilayer construction (MA) has at least one further layer (S6) which preferably contains a polymer selected from the group consisting of polymer (P1), polymer (P2), and a mixture of these. Alternatively or in addition, the layer (S6) may also contain a paper, a metal, a glass, or other materials. Preferably, one of the at least one further layers (S6) is arranged either between the layers (S2) and (S3) and/or between the layers (S3) and (S4). Particularly preferably, the at least one further layer (S6) includes a polymer from the group of the polymers (P1). The polymer layer (S5) or the polymer layer (S6) preferably has the same composition of polymers as the polymer layer (S1). In a preferred embodiment of the multilayer construction (MA), the polymer (P1) is a polycarbonate or copolycarbonate of formula (Ia), (I-2), (I-3) or (I-4), with (Ia) in whichR1 and R2 are independently hydrogen, halogen, preferably chlorine or bromine, C1-C8-alkyl, C5-C6-cycloalkyl, C6-C10-aryl, preferably phenyl, and C7-C12-aralkyl, preferably phenyl-C1-C4-alkyl, especially benzyl,m is an integer from 4 to 7, preferably 4 or 5,R3 and R4 can be chosen individually for each X and are independently hydrogen or C1-C6-alkyl andX is carbon,with the proviso that, on at least one atom X, R3 and R4 are both alkyl, or in which R5 is a C1- to C4-alkyl radical, aralkyl radical or aryl radical, preferably a methyl radical or phenyl radical, very particularly preferably a methyl radical. Preferably, the one or more polycarbonates or copolycarbonates based on diphenols of the polymer layer (S1) or (S5) have an MW (weight-average molecular weight, determined by size exclusion chromatography (SEC) after prior calibration with polycarbonate calibrants) of at least 10000 g/mol, preferably of 15000 g/mol to 300 000 g/mol, particularly preferably 17000 to 36000 g/mol, very particularly preferably 17000 to 34000 g/mol. The polymer (P1) may be linear or branched and may be homopolycarbonates or copolycarbonates. Preferably, the at least one polycarbonate or copolycarbonate based on diphenols of the polymer (P1) comprises a carbonate structural unit of the formula (I-1). These polycarbonates or copolycarbonates may be prepared in known fashion from diphenols, carbonic acid derivatives, optionally chain terminators and optionally branching agents. Details of the preparation of polycarbonates have been set out in many patent specifications over the past 40 years. Reference may be made here merely by way of example to H. Schnell, “Chemistry and Physics of Polycarbonates”, Polymer Reviews, Volume 9, Interscience Publishers, New York, London, Sydney 1964, to D. Freitag, U. Grigo, P. R. Müller, H. Nouvertné, BAYER AG, “Polycarbonates” in Encyclopedia of Polymer Science and Engineering, Volume 11, Second Edition, 1988, pages 648-718 and also to Dres. U. Grigo, K. Kirchner and P. R. Müller, “Polycarbonate” [Polycarbonates] in Becker/Braun, Kunststoff-Handbuch [Plastics Handbook], volume 3/1, Polycarbonate, Polyacetale, Polyester, Celluloseester [Polycarbonates, Polyacetals, Polyesters, Cellulose Esters], Carl Hanser Verlag Munich, Vienna 1992, pages 117-299. In the “Encyclopedia of Polymer Science and Technology”, John Wiley & Sons, Inc., by Daniel J. Brunelle, the article “Polycarbonates” on pages 1 to 33 describes not only the preparation of suitable polycarbonates or copolycarbonates but particularly in table 3 on pages 10 to 13 describes aromatic polycarbonates based on bisphenols. Starting materials for the realization of polycarbonate structural units according to formula (I-1) are dihydroxydiphenylcycloalkanes of formula (I-1a) in whichX, R1, R2, R3, R4 and m are as defined for formula (I-1). Starting materials for the realization of polycarbonate structural units according to formula (I-2), (I-3) and/or (I-4) are dihydroxydiphenylcycloalkanes of formula (I-2a), (I-3a) and/or (I-4a) in which R5 is a C1- to C4-alkyl radical, aralkyl radical or aryl radical, preferably a methyl radical or phenyl radical, very particularly preferably a methyl radical. Preferably, in formula (I-1a), the radicals R1 and R2 are hydrogen. Preferably, in formula (I-1a), R3 and R4 are both alkyl on 1-2 atoms X, especially on only one atom X. The preferred alkyl radical in formula (I-1a) for R3, R4 is methyl; the X atoms in alpha position to the diphenyl-substituted carbon atom (C-1) are preferably not dialkyl-substituted, and at least one X atom in beta position to C-1 is preferably alkyl-disubstituted. In a preferred embodiment of the multilayer construction (MA), the polycarbonate or copolycarbonate has been prepared partly from the starting materials selected from the group consisting of: or mixtures of at least two of these. Preference is given in formula (I-1a) to dihydroxydiphenylcycloalkanes having 5 and 6 ring carbon atoms in the cycloaliphatic radical (m=4 or 5 in formula (I-1a)), for example the diphenols of formulae (I-1b) to (I-1d), with particular preference being given to 1,1-bis(4-hydroxyphenyl)-3,3,5-trimethylcyclohexane (formula (I-1b) with R1 and R2 being H). The polycarbonates can be prepared according to EP 0359953 A1 from diphenols of formula (I-1a). It is possible to use either one diphenol of formula (I-1a) to form homopolycarbonates or two or more diphenols of formula (I-1a) to form copolycarbonates. At least one of the polymer layers (S1), (S2), (S3), (S4) and/or (S5) of the multilayer construction (MA) may also include at least one filler. The filler is preferably at least one color pigment and/or at least one other filler for generating translucency of the filled layers, particularly preferably a white pigment, very particularly preferably titanium dioxide, zirconium dioxide or barium sulfate, and in a preferred embodiment titanium dioxide. The filling of at least one polymer layer (S1), (S2), (S3), (S4) or (S5) and optionally (S6) of the multilayer construction (MA) with at least one such filler can enhance the visibility of incorporated inscription/images, further increasing the perception of enhanced sharpness and resolution, or prevent electronic components such as antennae and ICs from being visible. Depending on the effect desired, any combination of filling can be undertaken in the individual layers (S1) to (S6). The fillers mentioned are preferably added in amounts of 2% to 45% by weight, particularly preferably of 5% to 30% by weight, based on the total weight of the respective polymer layer (S2), (S3) or (S4) containing the filler, which may be brought about for example by extrusion or coextrusion. In particular, this is the core layer (S3); less preferably this is the polymer layers (S2) or (S4). The polymer layer (S1) or (S5) preferably includes 0% to 1% by weight, more preferably 0.01% to 0.5% by weight, particularly preferably 0.05% to 0.1% by weight of a filler from the list as mentioned above, based on the total weight of the polymer layer (S1) or (S5). Preferably, the polymer layer (S2), (S3) and/or (S4) comprises a filler and the polymer layers (S1) and (S5) are free of fillers. Particularly preferably, the polymer layers (S1), (S2), (S4) and/or (S5) are free of fillers. A part of the multilayer construction (MA) according to the invention, comprising at least one polymer layer (S1) and a further polymer layer (S2) and optionally a further layer (S6) between the layers, i.e. ((S1)-(S6)-(S2)) or next to layer (S2) ((S1)-(S2)-(S6)) or alternatively or additionally the polymer layers (S4) and (S5) with optionally a further layer (S6) between the layers ((S4)-(S6)-(S5)) or next to layer (S4), i.e. ((S6)-(S4)-(S5)), can for example and with preference be produced by means of coextrusion of the layers present, lamination of the layers present or extrusion lamination, i.e. extruding-on of the layer(s). Preference is given to the variants of coextrusion and extruding-on. Very particular preference is given to the production of at least a part of the multilayer construction (MA) by means of coextrusion of at least the polymer layers (S1) and (S2) or (S4) and (S5). Preference is accordingly given to a coextruded multilayer construction (MA) comprising at least one further polymer layer (S2) and/or (S4) and/or optionally (S6) containing at least one blend composed of at least one or more poly- or copolycondensate(s) of an aromatic and/or cycloalkyldicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms with one or more poly- or copolycarbonate(s), characterized in that the proportion of poly- or copolycarbonate(s) in this blend is within a range from ≥50% by weight to ≤90% by weight, preferably a range from ≥60% by weight to ≤80% by weight, very particularly preferably within a range from ≥60% by weight to ≤70% by weight, and in that the poly- or copolycondensate(s) of an aromatic and/or cycloalkyldicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms include a proportion of cyclohexane-1,4-dimethanol, cyclohexane-1,3-dimethanol and/or 2,2,4,4-tetramethylcyclobutane-1,3-diol within a range from ≥20 to ≤80 mol %, preferably within a range from ≥25 to ≤75 mol % and particularly preferably within a range from ≥25 to ≤70 mol %, based on the diol component. More preferred is a coextruded multilayer construction (MA) comprising at least one further polymer layer (S2) containing at least one or more poly- or copolycondensate(s) of an aromatic and/or cycloalkyldicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms with one or more poly- or copolycarbonate(s), characterized in that the proportion of poly- or copolycarbonate(s) in this blend is within a range from ≥50% by weight to ≤90% by weight, preferably a range from ≥60% by weight to ≤80% by weight, very particularly preferably within a range from ≥60% by weight to ≤70% by weight, and in that the poly- or copolycondensate(s) of an aromatic and/or cycloalkyldicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms include a proportion of cyclohexane-1,4-dimethanol, cyclohexane-1,3-dimethanol and/or 2,2,4,4-tetramethylcyclobutane-1,3-diol within a range from 30 to 80 mol %, preferably within a range from 30 to 75 mol % and particularly preferably within a range from 32 to 68 mol %, based on the diol component, and in each case an outer layer (S1) and/or (S5), where these outer layers (S1) and/or (S5) contain one or more poly- or copolycondensate(s) of an aromatic and/or cycloalkyldicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms. The coextruded multilayer construction (MA) optionally contains a further layer (S6), wherein this further layer (S6) comprises one or more poly- or copolycondensate(s) of an aromatic and/or cycloalkyldicarboxylic acid and aliphatic, cycloaliphatic and/or araliphatic diols having 2 to 16 carbon atoms and the layers are arranged in such a way that the two polymer layers (S1) and (S5) form the outer layers of the coextruded multilayer construction (MA). The multilayer construction (MA) according to the invention, whether extruded or laminated, is exceptionally suitable as a constituent for security documents, preferably identification documents and/or bank cards. The multilayer construction (MA) is especially suitable for inscription by means of laser engraving. When using the multilayer construction (MA), high sharpness and high quality of the elements applied by laser engraving are achieved. By means of laser engraving, it is preferably possible to introduce personalizing lettering and/or images into one of the polymer layers (S1), (S2), (S4), (S5) or optionally (S6). The multilayer construction (MA) is very particularly preferably suitable for identification documents in the form of bonded or laminated layer composites in the form of plastics cards, such as for example personal identity cards, passports, driver's licenses, credit cards, bank cards, cards for access control or other identity documents etc. Preferred identification documents within the context of the present invention are multilayer sheet-format documents having security features such as chips, photographs, biometric data etc. These security features can be visible or at least interrogable from the outside. Such an identification document preferably has a size between that of a check card and that of a passport. Such an identification document can also be part of a document composed of a plurality of parts, such as for example an identification document made of plastic in a passport that also comprises paper or paperboard parts. The multilayer construction (MA) exhibits a good adhesion of the individual polymer layers in layer constructions such as for example in security documents, with high resolution, clarity, transparency, planarity and low warpage, even at high lamination temperatures. Furthermore, the multilayer construction (MA), particularly as a constituent in security documents, preferably identification documents and/or bank cards, has a very good chemical resistance, in particular against acetone and synthetic sebum. The durability of security documents containing the multilayer construction (MA) is better than conventional cards, which is apparent in the synopsis of all the parameters mentioned. In a preferred embodiment of the multilayer construction (MA), the polycarbonate or copolycarbonate includes the starting compound (Ib) within a range from 10% by weight to 90% by weight, based on the total mass of the polycarbonate or copolycarbonate, or the polycarbonate or copolycarbonate has a molar ratio of (Ib) to other bisphenol A derivatives within a range from 1:10 to 10:1, preferably within a range from 1:5 to 5:1. In a preferred embodiment of the multilayer construction (MA), the polymer layers (S2), (S3) and (S4) independently of one another contain or consist of at least one polymer (P2) selected from the group consisting of a polycarbonate, a mixture or a blend of a polycarbonate and a copolyester, or mixtures of at least two of these. Preferably, the polymer layer (S4) has transparency in the visible wavelength range, preferably in the range from ≥70% to ≤99%, preferably from ≥80% to ≤95%, particularly preferably ≥88% to ≤93%, determined according to ISO 13468-2:2006-07. In a preferred embodiment of the multilayer construction (MA), the complete multilayer construction (MA) or one of the polymer layers (S1) or (S5) or optionally (S6) has at least one, preferably at least two, particularly preferably all, of the following properties: (A) a thickness within a range from 10 to 1000, preferably within a range from 20 to 950 μm, particularly preferably within a range from 30 to 900 μm, very particularly preferably within a range from 50 to 800 μm;(B) a planarity within a range from 5 to 40 mm, preferably within a range from 10 to 30 mm for a 500 mm*600 mm-sized layer construction;(C) a vertical deviation in the thickness of the multilayer construction (MA) within a range from ≥0.002 to ≤0.020 mm, further preferably within a range from ≥0.003 to ≤0.015 mm, most preferably within a range from ≥0.005 to ≤0.01 mm over the entire area of the multilayer construction (MA);(D) a layer thickness tolerance of from 4% to 20%, further preferably from 5% to 15%, particularly preferably from 6% to 10%, based on the nominal layer thickness of the multilayer construction (MA) or of the respective polymer layers (S1) to (S6);(E) a heat resistance of up to a temperature of 350° C., more preferably up to 380° C.;(F) a transparency within a range from 20% to 98%, preferably from 50% to 95%, particularly preferably from 60% to 90%, measured according to ISO 13468-2:2006-07. The multilayer construction (MA) preferably has at least one, and preferably a combination of properties selected from the group consisting of (A); (B); (C); (D); (E); (F); (A) and (B); (A) and (C); (A) and (D); (A) and (E); (A) and (F); (B) and (C); (B) and (D); (B) and (E); (B) and (F); (C) and (D); (C) and (E); (C) and (F); (D) and (E); (D) and (F); (E) and (F); (A) and (B) and (C); (A) and (B) and (D); (A) and (B) and (E); (A) and (B) and (F); (A) and (C) and (D); (A) and (C) and (E); (A) and (C) and (F); (A) and (D) and (E); (A) and (D) and (F); (A) and (E) and (F); (B) and (C) and (D); (B) and (C) and (E); (B) and (C) and (F); (B) and (D) and (E); (B) and (D) and (F); (B) and (E) and (F); (C) and (D) and (E); (C) and (D) and (F); (C) and (E) and (F); (D) and (E) and (F); (A) and (B) and (C) and (D); (A) and (B) and (C) and (E); (A) and (B) and (C) and (F); (A) and (B) and (D) and (E); (A) and (B) and (D) and (F); (A) and (B) and (E) and (F); (A) and (C) and (D) and (E); (A) and (C) and (D) and (F); (A) and (C) and (E) and (F); (A) and (D) and (E) and (F); (B) and (C) and (D) and (E); (B) and (C) and (D) and (F); (B) and (C) and (E) and (F); (A) and (B) and (C) and (D) and (E); (A) and (B) and (C) and (D) and (F); (A) and (B) and (C) and (E) and (F); (A) and (B) and (D) and (E) and (F); (A) and (C) and (D) and (E) and (F); (B) and (C) and (D) and (E) and (F); (A) and (B) and (C) and (D) and (E) and (F). The planarity mentioned under property (B) can be established by measuring the height deviation of a 500*600 mm-sized piece of the multilayer construction (MA) with the aid of a ruler when the piece is placed on a flat surface such as a table. Preferably, the planarity is determined on both sides of the planar multilayer construction (MA). Preferably, the values of the planarity measurements on both sides of the multilayer construction (MA) are within the specified range of property (B). Preferably, the planarity values on one side of the (MA) do not deviate by more than 10%, preferably not by more than 5%, from the planarity values on the opposite side of the (MA), with the side of the (MA) with the higher values forming the basis for determining the deviation. Preferably, one of the polymer layers (S1) or (S5), that is to say the respective outer layer, each have at least one, preferably both, of the following properties: (A) a thickness within a range from 5 to 100 μm, preferably within a range from 6 to 50 μm, particularly preferably within a range from 7 to 40 μm, very particularly preferably within a range from 10 to 30 μm;(B) a transparency within a range from 20% to 98%, preferably from 50% to 95%, particularly preferably from 60% to 90%, measured according to ISO 13468-2:2006-07. Preferably, the polymer layer (S2) or (S4) each have at least one, preferably both, of the following properties: (C) a thickness within a range from 10 to 100 μm, preferably within a range from 20 to 90 μm, further preferably within a range from 25 to 85 μm, particularly preferably within a range from 30 to 80 μm, very particularly preferably within a range from 40 to 70 μm;(D) a transparency within a range from 20% to 98%, preferably from 50% to 95%, particularly preferably from 60% to 90%, measured according to ISO 13468-2:2006-07. Preferably, one of the polymer layers (S1), (S2), (S3), (S4), (S5) or (S6) includes a laser-sensitive additive, preferably a black pigment, particularly preferably carbon black. The polymer layer containing the laser-sensitive additive can readily be personalized by laser engraving. The inscription of plastics films by means of laser engraving is referred to in short as laser inscription both in the art and hereinbelow. Accordingly, the term “laser-inscribed” is hereinbelow to be understood as meaning inscribed by laser engraving. The process of laser engraving is known to those skilled in the art and is not to be confused with printing using laser printers. Suitable laser-sensitive additives include for example so-called laser marking additives, i.e. additives composed of an absorber in the wavelength range of the laser to be used, preferably in the wavelength range of Nd:YAG lasers (neodymium-doped yttrium aluminum garnet lasers). Such laser marking additives and the use thereof in molding compounds are described for example in WO-A 2004/50766 and WO-A 2004/50767 and are commercially available from DSM under the brand name Micabs™ Absorbers also suitable as laser-sensitive additives are carbon black and phosphorus-containing tin-copper mixed oxides such as described in WO-A 2006/042714 for example. The laser-sensitive additive may be present in the polymer layers (S1) and/or (S2) and/or (S3) in an amount of 0.5 to 180 ppm, preferably from 1 to 160 ppm, particularly preferably 5 to 120 ppm. In the context of the invention, ppm is to be understood as meaning ppm by weight unless otherwise stated. It is preferable for the particle size of the laser-sensitive additive to be within the range from 100 nm to 10 μm and particularly advantageous for it to be within the range from 50 nm to 2 μm. The optional addition of laser-sensitive additives, preferably black pigments, particularly preferably carbon black, to the polymer layers (S1) and/or (S2) and/or (S4) and/or (S5) does not impair the transparency of the multilayer construction (MA). The invention further provides a method for producing a multilayer construction (MA), comprising the steps of: i) providing at least one first outer layer (S1), at least one further polymer layer (S2), at least one core layer (S3), at least one further polymer layer (S4), at least one second outer layer (S5), and optionally at least one further polymer layer (S6);ii) arranging the layers (S1) to (S5), optionally (S6), in any sequence, with the proviso that the outer layers (S1) and (S5) each form an outer layer of the multilayer construction (MA);iii) forming a laminate from the polymer layers (S1) to (S5) and optionally (S6) provided in step i) and arranged in step ii) at a temperature (T1) of ≥150° C., preferably ≥180° C., more preferably ≥200° C., very particularly preferably ≥210° C., which acts on at least one of the two outer layers (S1) or (S5), preferably on both outer layers (S1) and (S5) equally; wherein the polymer layers (S1) and (S5) each contain or consist of a polymer (P1) that in each case has a Vicat softening temperature of ≥149° C., preferably ≥160° C., further preferably ≥170° C.; more preferably ≥180° C., determined according to ISO 306:2004 (50 N; 50°/h) The polymer layers (S1) to (S5) and optionally (S6) can be provided in step i) in any manner that a person skilled in the art would select for a lamination for producing the multilayer construction (MA). Preferably, they are provided in a continuous lamination system. The sequence of layers (S1) to (S6) during the provision in step i) can be freely selected such that an arrangement of the layers in step ii) is freely selectable so long as the polymer layers (S1) and (S5) each form an outer layer. The laminate can be formed in step iii) in any manner that a person skilled in the art would select for a lamination at a temperature (T1) of at least 150° C. and preferably at most 300° C. Preferably, the lamination takes place in the form of a roll lamination in which the provided polymer layers from steps i) to ii) are guided over at least two opposing rollers or rolls, also called a roller pair. Of the at least two rollers or rolls, at least one is heated up to a temperature (T1). Preferably, the roll lamination takes place via two series-connected roller pairs, each of the 4 rollers of which can be heated individually. A cooling station is preferably located in each case between and/or behind the roller pairs and is cooled to a temperature far below (T1). The cooling stations are preferably brought to a temperature within a range of 10 to 100° C., preferably from 15 to 80° C., particularly preferably from 20 to 50° C. The polymer layer (S1), which is located on the outer side (AS1), then comes into contact with the heated rollers or rolls. Depending on which polymer layer forms the second outer layer (AS2), the second roller or roll may also be heated, may be heated to a lesser degree than the first roller or roll, or may not be heated at all. The opposing roller pairs are preferably heated equally to a temperature (T1) that is ≥150° C., preferably ≥180° C., more preferably ≥200° C., very particularly preferably ≥210° C., but at most 300° C. The contact surface of the rollers on the outer layers (S1) and (S5) is preferably 1 to 100 mm, preferably 2 to 50 mm, particularly preferably 3 to 20 mm. All properties, compositions, dimensions and configurations of the multilayer construction (MA) according to the invention are also applicable in the context of the method for producing the multilayer construction (MA) and are not mentioned again here in order to avoid repetitions. In a preferred embodiment of the method, the heat input into the respective outer layers (AS1) or (AS2), in particular the polymer layer (S1) or (S5), in step iii) is at least ≥50 J/s*m2, preferably ≥60 J/s*m2, particularly preferably ≥80 J/s*m2. These figures are given in joules (J)/second (s)*square meter (m2). In a preferred embodiment of the method, the input of heat to the respective polymer layer (S1) and/or (S5) in step iii) at a roller temperature (T1) starting from 23° C. is effected within ≤15 seconds, preferably ≤10 seconds, more preferably ≤5 seconds, in particular within a range from 5 to 10 seconds. In a preferred embodiment of the method, the polymer layer (S1) or the polymer layer (S5) independently of one another include at least one polymer (P1) selected from the group consisting of a polycarbonate, a copolycarbonate, or a mixture of at least two of these. In a preferred embodiment of the method, the polymer layer (S2), (S3), (S4) or the polymer layer (S6) independently of one another include at least one polymer (P2) selected from the group consisting of a polycarbonate, a mixture or a blend of a polycarbonate and a copolyester, or a mixture of at least two of these. The invention further provides a laminate, in particular a security document containing a multilayer construction (MA) according to the invention or a multilayer construction (MA) produced by the method according to the invention. All properties, compositions, dimensions and configurations of the multilayer construction (MA) according to the invention or the production method thereof are also applicable in the context of the security document and are not mentioned again here in order to avoid repetitions. Preferably, the security document is an identification document, such as an ID card or a passport, and/or a bank card containing at least one multilayer construction (MA). The security document, preferably identification document, according to the invention may comprise further additional layers, for example at least one polymer layer (S6), via which for example further information may be introduced into the security document, preferably identification document and/or bank card. Preferably, the polymer layer (S6) includes the polymer (P2) in an amount within a range from 50% to 100% by weight, further preferably within a range from 70% to 98% by weight, particularly preferably within a range from 80% to 95% by weight, based on the total weight of the polymer layer (S6). The polymer layer (S6) may likewise include additives, as already listed for the polymer layers (S1), (S2) and (S3), preferably in the same amounts as indicated there. Such further information may for example be personalizing portraits or non-personalizing general information contained for example in the same form in every security document, preferably identification document and/or bank card, of the same type. Such layers may for example be introduced into the security document, preferably identification document and/or bank card, from films or polymer layers previously provided with this information by means of conventional printing processes, preferably inkjet or laser printing, particularly preferably color printing. Films or polymer layers that can be printed by means of inkjet printing processes are known per se to those skilled in the art and may for example also be the polymer layers (S6) according to the invention. In particularly preferred embodiments, plastics films or polymer layers (S6) colored white or translucent by means of fillers such as for example titanium dioxide, zirconium dioxide, barium sulfate etc. are used for better visibility of the printed information. Suitable as polymer layers to be printed by means of laser printing, in particular by means of color laser printing, are in particular those of the polymer layers (S2) according to the invention and described at the outset that have a specific surface resistance of 107 to 1013Ω, preferably of 108 to 1012Ω. Specific surface resistance in Ω is determined according to DIN IEC 60093 (1993). These may preferably be those polymer layers (S1), (S5) or optionally (S6) in which, prior to the layer production, to achieve the specific surface resistance, the plastic has had added to it for example an additive selected from tertiary or quaternary, preferably quaternary ammonium or phosphonium salts of a partially fluorinated or perfluorinated organic acid or quaternary ammonium or phosphonium hexafluorophosphates, preferably a partially fluorinated or perfluorinated alkylsulfonic acid, with preference a perfluoroalkylsulfonic acid. These additives may be present in particular in the polymer layer (S1) and/or (S5), but also to a minor extent in the polymer layers (S2) and/or (S3), (S4), (S6). Preferred suitable quaternary ammonium or phosphonium salts are: tetrapropylammonium perfluorooctanesulfonate,tetrapropylammonium perfluorobutanesulfonate,tetrabutylammonium perfluorooctanesulfonate,tetrabutylammonium perfluorobutanesulfonate,tetrapentylammonium perfluorooctanesulfonate,tetrapentylammonium perfluorobutanesulfonate,tetrahexylammonium perfluorooctanesulfonate,tetrahexylammonium perfluorobutanesulfonate,trimethylneopentylammonium perfluorobutanesulfonate,trimethylneopentylammonium perfluorooctanesulfonate,dimethyldineopentylammonium perfluorobutanesulfonate,dimethyldineopentylammonium perfluorooctanesulfonate,N-methyltripropylammonium perfluorobutylsulfonate,N-ethyltripropylammonium perfluorobutylsulfonate,tetrapropylammonium perfluorobutylsulfonate,diisopropyldimethylammonium perfluorobutylsulfonate,diisopropyldimethylammonium perfluorooctylsulfonate,N-methyltributylammonium perfluorooctylsulfonate,cyclohexyldiethylmethylammonium perfluorooctylsulfonate,cyclohexyltrimethylammonium perfluorooctylsulfonate, and the corresponding phosphonium salts. The ammonium salts are preferred. It is also possible with preference to use one or more of the abovementioned quaternary ammonium or phosphonium salts, i.e. mixtures as well. Of very particular suitability are tetrapropylammonium perfluorooctanesulfonate, tetrabutylammonium perfluorooctanesulfonate, tetrapentylammonium perfluorooctanesulfonate, tetrahexylammonium perfluorooctanesulfonate and dimethyldiisopropylammonium perfluorooctanesulfonate, and the corresponding perfluorobutanesulfonic salts. Particular preference is given to using dimethyldiisopropylammonium perfluorobutanesulfonate (diisopropyldimethylammonium perfluorobutylsulfonate) as additive. The salts mentioned are known or can be prepared by known methods. The salts of the sulfonic acids can be prepared for example by combining equimolar amounts of the free sulfonic acid with the hydroxyl form of the corresponding cation in water at room temperature and concentrating the solution. Other preparation processes are described for example in DE-A 1 966 931 and NL-A 7 802 830. The salts mentioned are with preference added, in amounts of 0.001% to 2% by weight, preferably of 0.1% to 1% by weight, based on the total weight of the respective polymers (P1), (P2) or (P3), to the polymers (P1), (P2) or (P3) prior to shaping to give the multilayer construction (MA) according to the invention, which may preferably be brought about by extrusion or coextrusion. Preferably, the multilayer construction (MA) according to the invention is used for the accelerated production of a laminate, with production preferably being effected within 15 seconds, further preferably within 10 seconds, particularly preferably within 5 seconds, in particular within a range from 5 to 10 seconds, preferably using temperatures within a range from 180° C. to 230° C., particularly preferably from 190° C. to 210° C. Preferably, simultaneously to the elevated temperature, a pressure is applied within a range from 10 N/cm2 to 400 N/cm2, with preference from 30 N/cm2 to 300 N/cm2, particularly preferably from 40 N/cm2 to 250 N/cm2. Preference is given to the use of the multilayer construction (MA) according to the invention for producing a laminate within 15 seconds, preferably within 10 seconds, particularly preferably within 5 seconds, in particular within a range from 5 to 10 seconds. The invention further provides for the use of a multilayer construction (MA) according to the invention or of a multilayer construction (MA) produced by the method according to the invention for a surface treatment, in particular a lamination, at a temperature (T1) within a range from ≥160° C. to ≤250° C., preferably within a range from ≥170° C. to ≤240° C.; more preferably within a range from ≥180° C. to ≤230° C., particularly preferably within a range from ≥185° C. to ≤220° C., very particularly preferably within a range from ≥190° C. to ≤210° C. Preferably, simultaneously to the elevated temperature, a pressure is applied within a range from 10 N/cm2 to 400 N/cm2, with preference from 30 N/cm2 to 300 N/cm2, particularly preferably from 40 N/cm2 to 250 N/cm2. When using the multilayer construction (MA) according to the invention for a surface treatment, in particular for a lamination, the multilayer construction (MA) is layered in one of the arrangement possibilities described above in connection with the multilayer construction (MA) according to the invention and the production method thereof, and is exposed to the chosen temperature (T1) and to an elevated pressure for as short a period as possible, preferably for 5 to 30 seconds, preferably 10 to 20 seconds. The pressure is preferably within a range from 10 N/cm2 to 1400 N/cm2, with preference from 30 N/cm2 to 1200 N/cm2, particularly preferably from 40 N/cm2 to 1000 N/cm2. Since both temperature and pressure are preferably transferred to the polymer layers (S1) to (S5) and substrate via a roller or roll, the pressure is also introduced only for a short period. After the lamination process, a layer composite is obtained that holds the laminated layers together in such a way that the layer composite can only be separated back into the layers by destroying the laminate or that the individual layers can no longer be detached from one another at all. All properties, compositions, dimensions and configurations of the multilayer construction (MA) according to the invention or the production method thereof are also applicable in the context of the security document and are not mentioned again here in order to avoid repetitions. Preference is given to the use of the multilayer construction (MA) according to the invention for the production of a security document, preferably an identification document, in particular in a construction as described previously for this purpose. As already mentioned, further security features may have been introduced into the security document. The resulting security document, preferably identification document and/or bank card, may for example be produced in a manner such that a layer stack is assembled from the various polymer layers and substrates for the construction of the security document, preferably identification document and/or bank card, and is laminated to give a layer composite and then cut into the suitable shape for the security document, preferably identification document and/or bank card. Further layers may optionally be applied subsequently to this composite laminate, for example by bonding-on and/or laminating-on further films or by coating using paint compositions. The examples which follow serve for exemplary elucidation of the invention and should not be seen as limiting. In the context of the description of the polymer layers (S1) to (S6) or of the multilayer construction, reference is also made to films as a synonym for polymer layers.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/EP2022/069279 | 7/11/2022 | WO |
