Patent Application
20080015108
In embodiments, a biaxially oriented laminated polyester film for transfer applications is disclosed having a total thickness of from about 2.0 to about 7.0 um, comprising at least a first polyester layer (A layer) forming on one side (A side) a first surface and a second layer (B layer) forming on the other side (B side) a second surface, wherein the A side surface has a first surface roughness and the B side surface has a second surface roughness that is greater than the A side surface roughness.
The polyester suitable for use in the present disclosure can be any suitable material and is, in embodiments, is a polymer prepared from a diol and a dicarboxylic acid by condensation polymerization. The dicarboxylic acid is represented, for example, by terephthalic acid, isophthalic acid, phthalic acid, naphthalene dicarboxylic acid, adipic acid, sebacic acid, etc., but not limited thereto. The diol is represented, for example, by ethylene glycol, trimethylene glycol, tetramethylene glycol, cyclohexanedimethanol, etc., but not limited thereto. Specific examples of suitable materials are polyesters selected from the group consisting of polymethylene terephthalate, polyethylene terephthalate, polypropylene terephthalate, polyethylene isophthalate, polytetramethylene terephthalate, poly-1,4-cyclohexylenedimethylene terephthalate and poly-2,6-naphtalate, and mixtures and combinations thereof, although not limited to these materials. These polyesters may be either homopolymers or copolymers. As the copolymerization component, for example, a diol component such as diethylene glycol, neopentyl glycol or polyalkylene glycol, or a dicarboxylic component such as adipic acid, sebacic acid, isophthalic acid, phthalic acid or 2,6-naphthalene dicarboxylic acid can be used, among others. In embodiments, at least one material is selected from the group consisting of polyethylene terephthalate, polypropylene terephthalate, polyethylene isophthalate, polyethylene-2,6-naphthalate and copolymer thereof, which provide, in embodiments, desirable mechanical strength, thermal resistance, chemical resistance and durability.
The biaxially oriented polyester film of the present disclosure has, in embodiments, at least a dual layer structure with the A layer forming on one side (A side) a first surface and the B layer forming on the other side (B side) a second surface. The disclosure provides, in embodiments, film and film ribbon providing excellent film windability and high gloss prints not attainable with previously available mono layer structured films. Triple layer film structures having a C layer disposed between the A and B layers, or multi layer structures are also provided herein, in embodiments. The present dual or multi layer film structures can be produced in the line as described below.
In embodiments, the biaxially oriented polyester film of the present disclosure satisfies the following relationships:
6≦SRaA≦18;
30≦SRaB≦70;
wherein SRaA represents the three dimensional central plane average roughness (nm) of the A side surface, SRaB represents the three dimensional central plane average roughness (nm) of the B side surface.
In embodiments, characteristics are selected to satisfy the following relationships:
8≦SRaA≦;16
35≦SRaB≦65;
When the SRaA value is smaller than about 6, or the SRaB value is smaller than about 30, the windability of the film roll deteriorates. On the other hand, when the SRaA value is larger than about 18, or the SRaB value is larger than about 70, the high gloss characteristic of the prints is adversely affected.
In embodiments, the biaxially oriented polyester film of the present disclosure satisfies the following relationships:
4≦SRpA/SPcA≦12;
wherein SRpA is the three dimensional central plane maximum height (nm) of the A side surface, SPcA is the peak count of particles comprising the A side surface.
In embodiments, the film is selected to satisfy the following relationships:
5≦SRpA/SPcA≦10.
When the SRpA/SPcA value is smaller than about 4, the windability of the film deteriorates. On the other hand, when the SRpA/SPcA value is larger than about 12, the high gloss characteristic of the prints is adversely affected.
In embodiments, the biaxially oriented polyester film of the present disclosure satisfies the following relationships:
2.0≦udAA/udAB≦4.0;
wherein udAA is the dynamic coefficient of friction between two A sides, and udAB is the dynamic coefficient of friction between the A side and the B side.
In embodiments, the film herein satisfies the following relationships:
2.2≦udAA/udAB≦3.8.
When the udAA/udAB value is smaller than about 2.0, the windability of the film deteriorates. On the other hand, when the udAA/udAB value is larger than 4.0, the desired high glossiness of the prints cannot be achieved.
The thickness of the laminated film is selected, in embodiments at from about 2.0 to about 7.0 um, or from about 3.0 to about 6.0 um. When the thickness of the film is smaller than about 2.0 um, thermal properties, mechanical properties, or a combination thereof, deteriorate. On the other hand, when the thickness of the film is larger than about 7.0 um, the heat sensitivity of the film deteriorates because of the need to increase the energy of thermal heads. The ribbon length can be selected at shorter lengths, in embodiments.
In order to realize the surface roughness and dynamic coefficient of friction coefficient characteristics described herein, the average particle diameter or the content of the inert particles are selected accordingly. Further, the stretch draw ratio or treatment temperature during producing biaxially oriented film can be selected to achieve or enhance the desired properties. Inorganic or organic particles, such as colloidal silica, cohesive silica, alumina, calcium carbonate, kaolin, cross-linked polystyrene or silicone particle can be added in order to enhance film windability. In the present disclosure, by satisfying the following relationships, desirable surface roughness and dynamic friction coefficient criteria as described herein are readily achieved:
0.5≦dA≦1.2;
0.02≦cA≦0.06;
2.0≦dB≦3.5;
0.20≦cB≦0.35;
2.0≦dA/dB≦6.0;
wherein dA is the inert particle average diameter of particles comprising the A layer, cA is the inert particle content by weight with respect to the total weight of the A layer, dB is the inert particle average diameter of particles comprising the B layer, cB is the inert particle content by weight with respect to the total weight of the B layer.
In embodiments, the material is selected so as to satisfy the following relationships, providing, in embodiments, the surface roughness and dynamic friction coefficient described before:
0.6≦dA≦1.1;
0.03≦cA≦0.05;
2.2≦dB≦3.2;
0.22≦cB≦0.32;
2.5≦dA/dB≦5.5.
Additionally, in the present disclosure, the runability of the thermal transfer ribbon is improved by, in embodiments, restricting the F-5 value in the longitudinal direction of the film, and further, in various embodiments, by restricting or selecting, the lamination structure, surface roughness, dynamic coefficient of friction for the two or more layers, film layer thickness, average particle diameter and content of particles, or mixtures and combinations thereof. In embodiments, an F-5 value in the longitudinal direction of the film is desirably selected at from about 115 to about 145 MPa, or from about 120 to about 140 MPa. When the F-5 value is smaller than about 115 MPa, runability deteriorates, such as, for example, adverse events such as wrinkles occur easily in the case of using as the thermal transfer ribbon. On the other hand, when the F-5 value is larger than about 145 MPa, productivity deteriorates.
Moreover, in the present disclosure, in embodiments, film treatability is improved by, in embodiments, restricting the heat shrinkage in the transverse direction of the film, selecting the lamination structure, surface roughness, dynamic coefficients of friction, film thickness, and average particle diameter and particle content, and mixtures and combinations of these. The heat shrinkage in the transverse direction of the film is desirably in the range of from about −1.0 to about +1.0%, measured at about 150 degrees for about 30 minutes, or from about −0.8 to about +0.8%, measured at about 150 degrees for about 30 minutes. When the heat shrinkage is lower than about −1.0%, productivity deteriorates. When the heat shrinkage is higher than about +1.0%, film treatability deteriorates, for example, wrinkles occur on the moving path during inking and winding becomes more difficult.
In embodiments, the films described above may advantageously be prepared by the following method. The thermoplastic resins (A and B) can be separately extruded and after the extrusion and before the solidification, the extruded thermoplastic resin sheets are laminated by using a multilayered manifold or a cofluency block. In embodiments, it is desirable to provide a static mixer or gear pump on the moving path of the thermoplastic resin for attaining the desired relationship between the thickness of each layer. The laminated sheet is cooled and solidified on the casting drum, which surface is from about 20 to about 70 degrees Celsius to obtain a laminated non-oriented film. The thus prepared non-oriented laminated film is then stretched in the longitudinal direction from about 5.9 to about 6.5 times at a temperature of from about 80 to about 130 degrees Celsius in the first stretching process. In order to realize an F-5 value in the range of from about 115 to about 145 MPa in the longitudinal direction of the film, the stretch draw ratio is selected at higher than about 5.9 times, and to realize an F-5 value in the range of from about 120 to about 140 MPa in the longitudinal direction of the film, the stretch draw ratio is selected at about 6.0 to about 6.4 times.
The stretching in the transverse direction is, in embodiments, conducted by using a tenter. The film is preheated to about 100 to about 130 degrees Celsius, and then stretched in the transverse direction from about 3.5 to about 4.5 times as the second stretching process. The thus prepared biaxially stretched film is then heat treated at a temperature of from about 220 to about 240 degrees Celsius. It is also possible for the film to be stretched again in the longitudinal direction, the transverse direction or both longitudinal and transverse direction to enhance the mechanical strength before heat setting if desired. After heat treating, the film was made to relax in the transverse direction from about 3 to about 7% under about 150 to about 185 degrees Celsius, and at last the biaxially oriented laminated polyester film of the present disclosure may be in the form of a roll. In order to realize the heat shrinkage in the range of about −1.0 to about +1.0% in the transverse direction of the film, where it is measured at about 150 degrees Celsius for about 30 minutes, a heat setting temperature is in embodiments, selected in the range of from about 220 to about 240 degrees Celsius and the relaxation ratio in the transverse direction is, in embodiments, selected in the range of from about 3 to about 7%. Moreover, to realize the heat shrinkage in the range of from about −0.8 to about +0.8% in the transverse direction of the film, where it is measured at about 150 degrees Celsius for about 30 minutes, the heat setting temperature is selected, in embodiments, in the range of about from 225 to about 235 degrees Celsius and the relaxation ratio in the transverse direction is, in embodiments, selected in the range of from about 4 to about 6%.
The present films may produced by any suitable method and production thereof is not restricted as described before. For example, the stretching order of longitudinal direction and transverse direction could be replaceable, and it is further possible to utilize a simultaneous biaxial drawing method instead of a conventional successive biaxial drawing method.
In the case of using the films herein as thermal transfer film ribbon, particularly dye sublimation thermal transfer ribbon, in embodiments, an adhesive layer may be provided on the surface of inking side (A side) from the viewpoint of improving the adhesion between ink layer and polyester film. The adhesive layer is desirably formed of a thermoplastic resins such as polyester resins, acrylic resins and so on. The adhesive layer may also contain cross-linking agents or other additives, and these resins can be dissolved in water or organic solvents such as methyl ethyl ketone, acetone or toluene, among others.
An optional heat resistant slip layer, comprising for example, wax derivatives or silicone derivatives, may be provided on the support on a side remote from the thermally transferable resin layer from the viewpoint of avoiding sticking caused by heat from the thermal head during printing. These treatments can be done during or after producing the biaxially oriented polyester film. Well-known coating equipment, such as gravure coaters, roll coaters or rod coaters can be utilized, among other methods can be used.
Coating a thermal transfer ink, particularly dye sublimation thermal transfer ink, onto the inking side of the thus treated biaxially oriented polyester film, thermal transfer ribbon, particularly dye sublimation thermal transfer ribbon, can be accomplished in embodiments. Well-known ink, particularly sublimation dye, can be employed, and generally ink can be dissolved in organic solvents described before, and then coated, although other methods can be used.
The biaxially oriented laminated polyester film of the present disclosure can be used, in embodiments, as a biaxially oriented laminated polyester film for transfer applications so as to realize high glossiness of prints as well as excellent film windability even with films that are both wide and long simultaneously. Particularly, the biaxially oriented laminated polyester film of the present disclosure can be used as biaxially oriented laminated polyester film for thermal transfer ribbon, more particularly, for dye sublimation thermal transfer ribbon so as to achieve good treatability during inking and runability of thermal transfer ribbon additionally.
The following Examples are being submitted to further define various species of the present disclosure. These Examples are intended to be illustrative only and are not intended to limit the scope of the present disclosure. Also, parts and percentages are by weight unless otherwise indicated.
Various physical property values and characteristic properties in the present disclosure were measured and defined as follows.
(1) Three Dimensional Central Plane Average Roughness (SRa), Three Dimensional Central Plane Height (Srp) and Particle Peak Counts (SPc)
Surface roughness of the film was measured by a tracer type three-dimensional surface roughness tester (ET-30HK by Kosaka Kenkyusyo) under conditions of 0.5 um needle radius and 10 mg in load at the cut-off value of 0.25 mm along the transverse direction of the film over 0.5 mm in the length of measurement. Such measurement was made along the longitudinal direction of the film continuously by 80 times at the intervals of 5 um.
SRa and SRp are values defined in JIS-B0601. SPc is determined as follows. A peak count level was determined at the level of separating 0.01 um from average line of surface roughness curve in parallel. Between two intersection points of roughness curve and average line, and roughness curve and peak count level, one peak was defined when existing one intersection point of roughness curve and peak count level. These peaks were counted within the measure length 10 times, and an average value was calculated.
(2) Dynamic Coefficient Friction
A glass plate was fixed under a set of two films, a lower film (film in contact with the glass plate) of the set was pulled with a low-speed roll (10 cm/min), and a detector fixed at one end of an upper film (at the opposite end in the pulling direction of the lower film) to detect initial tensile force between the films. A sled having a weight of 1 kg and a lower area of 100 cm2 was used. The dynamic friction of coefficient (ud) was obtained from the following equation:
ud=tensile force during sliding (kg)/load of 1 kg
(3) Film Thickness
Ten films were placed one upon another in such a manner that dust was not be inserted therebetween, and the total thickness of the films measured by an intermittent electronic micrometer to calculate the thickness of each film.
(4) Average Diameter of Inert Particles
The average particle diameter was measured by using a Centrifugal Size Analyzer Type CP-50 manufactured by Shimadzu Corp. The particle diameter corresponding to 50 mass % was read from a cumulative curve showing the relationship between the particle diameter and the residual amount of the particles calculated based upon the obtained centrifugal precipitation curve, and the diameter was used as the average particle diameter.
(5) Content of Inert Particles
The amount of particles was determined by burning 50 grams of polyester film before recovery in a platinum crucible in an oven heated to about 1000 degrees for 3 hours, mixing the burnt residue in the crucible with powder terephthalic acid to form a tablet-formed plate of 50 grams weight, subjecting the tablet to wavelength dispersive fluorescent X-ray spectroscopy, and converting the obtained count of each element into the addition amount by using a calibration curve prepared beforehand. The X-ray output was set to 4 KW.
(6) F-5 Value
Using an Instron type tensile tester, a sample film was tensed at a width of 10 mm, a distance between clips of 100 mm and a tensile speed of 200 mm/min. In the tension-strain curve obtained, a tension at a position of 5% elongation is defined as the F-5 value. The test was performed in an atmosphere having a temperature of about 25 degrees Celsius and a humidity of about 65% RH.
(7) Heat Shrinkage
This measurement was carried out in accordance with JIS-C2318.
Sample size: width 10 mm, marked line interval 200 mm
Measurement condition: temperature 150 degrees Celsius, processing time 30 min, unloaded
Heat shrinkage was calculated by the following equation.
Heat shrinkage (%)=(L0−L)/L0*100
L0: marked line interval before heating
L: marked line interval after heating
(8) Film Windability
30,000 meters length of film roll slit to 1,500 millimeters width was wound on plastic core under a tension of 15 KG and a speed of 300 meters/min. Film windability was evaluated by the following criterion.
Excellent: No wrinkle occurred both in the beginning of and in the middle of winding.
Good: Wrinkles occurred in the beginning of winding but disappeared soon.
Poor: Wrinkles occurred in the beginning of and in the middle of winding, and did not disappear.
(9) Glossiness of Prints
At first, heat resistance slip layer having a following composition was coated on B side at a coverage of 1.0 g/m2 on a dry basis.
After that, adhesive layer having a following composition was coated on A side at a coverage of 1.5 g/m2 on a dry basis.
Moreover, overcoat layer having the following composition was coated onto adhesive layer at a coverage of 1.0 g/m2 on a dry basis.
A full density blotted image was printed on a receiver sheet with a dye sublimation printer UP-D 70A manufactured by Sony Co., 100 mm width and 150 mm length. Glossiness of prints thus prepared was measured with a gloss meter mirror-TR1-glosschecker manufactured by BYK-Gardner Inc., at an angle of incidence of 20 degrees according to JIS Z-8741. Glossiness was defined excellent when the value was no less than 70.
(10) Film Convertability into Thermal Transfer Ribbon
During inking described as (9), the status of moving film on path line and winding film on winder were observed and evaluated by the following criterion.
Excellent: No wrinkle occurred during moving on path line and winding on winder.
Good: No wrinkle occurred during moving on path line but during winding wrinkles occurred.
Acceptable: Wrinkles occurred during moving on path line and it became difficult to wind film on winder.
(11) Runability of Thermal Transfer Ribbon
During test printing described as (9), the status of contacting between ribbon and thermal head and prints quality were observed and evaluated by the following criterion.
Excellent: No sticking between ribbon and thermal head, and no wrinkle occurred during printing.
Good: No sticking between ribbon and thermal head, but wrinkles occurred during printing.
Acceptable: Sticking between ribbon and thermal head occurred and uneasy to proceed to print.
0.04 parts by weight cross-linked polystyrene particles having an average diameter of 0.8 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) 0.25 parts by weight silica dioxide particles having an average diameter of 2.6 um, manufactured by Toray Industries, Inc. were added to the polyethylene terephthalate, having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B) These polymers were supplied to each extruder and melted at 280 degrees Celsius. The molten polymers were joined in a T-die with combinations of 100 parts by weight of polymer A and 30 parts by weight of polymer B, and the polymer sheet was cast on a rotating cooling drum having a temperature of 20 degrees Celsius to prepare non-stretched laminated film.
The non-stretched film was introduced into a plurality of heated rollers and stretched at a draw ratio of 6.2 times under 125 degrees Celsius in a longitudinal stretching process. The film was introduced into a tenter which grasps both end positions of film by clips, and therein the film was stretched in the transverse direction at a temperature of 115 degrees Celsius and a draw ratio of 4.0 times. After that, the film was heat treated at 230 degrees Celsius and relaxed 4.5% by length in the transverse direction, obtaining biaxially oriented polyester film with 4.8 um thickness.
Three dimensional surface roughness, Dynamic coefficient of friction, F-5 value and heat shrinkage of the film were measured, and slit in a narrow width to evaluate windability. Further, preparing a dye sublimation thermal transfer ribbon, treatability during inking, runability of thermal transfer ribbon and glossiness of prints were evaluated. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, with the exception that 0.02 parts by weight cross-linked polystyrene particles having an average diameter of 0.5 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight of polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except that 0.05 parts by weight calcium carbonate particles having an average diameter of 1.1 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except that 0.21 parts by weight silica dioxide particles having an average diameter of 2.1 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except that 0.33 parts by weight silica dioxide particles having an average diameter of 3.3 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except that 0.06 parts by weight cross-linked polystyrene particles having an average diameter of 0.5 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1 except that a obtaining biaxially oriented polyester film thickness of 3.5 um was selected. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1 except that a biaxially oriented polyester film having a film thickness of 6.4 um was selected. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1 but with stretching at a draw ratio of 5.9 times in a longitudinal stretching process. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1 but with stretching at a draw ratio of 5.5 times in a longitudinal stretching process. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except that the film was heat treated at 223 degrees Celsius and relaxed 3.8% by length in the transverse direction. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except that the film was heat treated at 216 degrees Celsius and relaxed 2.5% by length in the transverse direction. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, with the exceptions that 0.02 parts by weight cross-linked polystyrene particles having an average diameter of 0.8 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight of polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) and, 0.50 parts by weight cross-linked polystyrene particles having an average diameter of 0.3 um, manufactured by Toray Industries, Inc. and 0.35 parts by weight calcium carbonate particles having an average diameter of 1.1 um, manufactured by Toray Industries, Inc., that is, totally 0.85 parts by weight particles having an average diameter of 0.7 um were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1 while changing from a dual extrusion and laminated film to a single extrusion and monolayer film. 0.35 parts by weight silica dioxide particles having an average diameter of 2.6 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except with 0.04 parts by weight cross-linked polystyrene particles having an average diameter of 0.3 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except 0.04 parts by weight silica dioxide particles having an average diameter of 1.4 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate, having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except 0.08 parts by weight cross-linked polystyrene particles having an average diameter of 0.8 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer A) The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except 0.35 parts by weight calcium carbonate particles having an average diameter of 1.1 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B) This film is Lumirror 4XN36H, manufactured by Toray Industries, Inc. The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except 0.10 parts by weight silica dioxide particles having an average diameter of 2.6 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate, having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B). The measurement results of characteristic properties of the film are shown in
A film and a dye sublimation thermal transfer ribbon were obtained in the same manner as Example 1, except 0.38 parts by weight silica dioxide particles having an average diameter of 2.6 um, manufactured by Toray Industries, Inc. were added to 100 parts by weight polyethylene terephthalate having an inherent viscosity of 0.6, manufactured by Toray Industries, Inc. (Polymer B) The measurement results of characteristic properties of the film are shown in
It will be appreciated that various of the above-disclosed and other features and functions, or alternatives thereof, may be desirably combined into many other different systems or applications. Also that various presently unforeseen or unanticipated alternatives, modifications, variations or improvements therein may be subsequently made by those skilled in the art which are also intended to be encompassed by the following claims. Unless specifically recited in a claim, steps or components of claims should not be implied or imported from the specification or any other claims as to any particular order, number, position, size, shape, angle, color, or material.
This application is related to and claims priority from earlier filed U.S. provisional patent application Ser. No. 60/831,272, filed Jul. 17, 2006 and incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 60831272 | Jul 2006 | US |
