Patent Application
20110289647
The present invention is in the field of pressure sensitive labels, and more particularly cold transfer process pressure sensitive labels for textile or other substrates. The pressure sensitive labels can be applied to a substrate and used in applications where a heat transfer label has been traditionally employed, but the present invention may accomplish the bonding with the substrate without the need of applying heat, a process referred as “cold transfer” throughout this disclosure. The pressure sensitive labels are durable and can remain on the substrate through repeated washing and drying cycles.
Heat transfer labels have gained broad acceptance in the garment industry. Care labels, brand identifiers, graphical, numerical and other type of expressions used as decorations or for providing information for shirts, pants, sportswear, and personal identification labels are all examples of such current applications. Heat transfer labels typically use hot melt adhesives which become sticky at elevated temperature so as to enable application to the substrate, but after cooling can feel stiff or rough at ambient temperature. This stiffness or roughness of the label can make the wearer uncomfortable and in some instances can lead to skin irritation. Heat used to apply the label on the garment may also lead to an undesirable bond mark on the garment, that is a darkened or discolored area near where the label is applied. For labels using sublimation dyes, the heat may also cause dye migration through the label causing blurring or fading of the image. The heat may also damage a heat sensitive fabric material, such as synthetic fabric, which may partially melt if the heat is too high or applied for too long a period of time.
Heat transfer labels have also been used broadly in other identification or personalization products such as caps, binders, shoes, tote bags, toys, consumer electronics, sports gear, etc. that are found in schools, sport activities, camps, gyms, and other places. In addition to the issues associated with a heat transfer label described previously, the heating requirement for the transferring process limits the use of such labels to areas where a heat source is readily available. However, there is a larger desire to have transferrable images when there is no source of heat, and where instant personalized souvenirs or mementos can be created, such as an outdoor site of a sporting event, religious retreats, corporate outings, campsites, etc.
Heat used in the transfer process of traditional heat transfer labels may also limit the incorporation of other items into the label. For example, chemical or physical sensing devices, tracking devices, security or detection devices can be sensitive to the high heat used for the transfer process of heat transfer labels and can be damaged through exposure to heat and as such these items have generally not been incorporated as part of the transfer label for garments process.
Traditional pressure sensitive labels have been used in association with garments as name badges and size identification labels. These labels normally do not need to remain on a garment for long periods of time and therefore do not need to be particularly durable so as to withstand repeated washing and drying cycles that may be encountered with the garment. The pressure sensitive label will likely fall off the garment if the garment is subject to washing and drying. The concern for the wearer's comfort is also minimized due to the temporary nature of such applications.
Thus, there is a need for a new label that can be used in lieu of a heat transfer label for garments and other identification or personalization applications. There is a further need for a cold transfer process pressure sensitive label that can remain on a garment through repeated washing and drying cycles and provides softness and comfort to a wearer.
The embodiments of the present invention described below are not intended to be exhaustive or to limit the invention to the precise forms disclosed in the following detailed description. Rather, the embodiments are chosen and described so that others skilled in the art may appreciate and understand the principles and practices of the present invention.
The invention is directed to a cold transfer process pressure sensitive label having similar or better properties to those of conventional heat transfer label offerings. The cold transfer process pressure sensitive label is suitable for use in connection with garment labeling, decoration, personalization, identification, and other purposes.
In one exemplary embodiment of the presently described invention, a pressure sensitive label includes an ink layer, a printable media layer, or both, with the ink layer on top of the printable media layer, and a pressure sensitive adhesive layer on the opposite side of the ink layer. The pressure sensitive adhesive has a wet adhesion to substrate greater than 10 N/in. The pressure sensitive label is capable of remaining on the substrate to which it is attached to through repeated washing and drying cycles.
In another exemplary embodiment of the presently described invention, a pressure sensitive label includes an ink layer and a pressure sensitive adhesive layer. The pressure sensitive adhesive is in registration with the ink layer and substantially juxtaposed thereon.
In another exemplary embodiment of the presently described invention, a labeled article includes a substrate and a pressure sensitive label. The pressure sensitive label includes an ink layer, or a printable media layer, or both, with the ink layer on top of the printable media layer, and a pressure sensitive adhesive layer on the opposite side of the ink layer. The pressure sensitive adhesive has a wet adhesion greater than 10 N/in. The pressure sensitive label is capable of remaining on the substrate to which it is attached to through repeated washing and drying cycles.
In a further exemplary embodiment of the presently described invention, a process of making a pressure sensitive label is described and includes the steps of first providing a temporary support and subsequently depositing an ink layer on the temporary support. Then depositing a pressure sensitive adhesive layer over the ink layer.
In a further exemplary embodiment of the presently described invention, a garment has a cold transfer pressure sensitive label attached to it. The pressure sensitive label includes an ink layer, or a printable media layer, or both, with the ink layer on top of the printable media layer, and a pressure sensitive adhesive layer on the opposite side of the ink layer. The pressure sensitive adhesive has a wet adhesion greater than 10 N/in. The pressure sensitive label is capable of remaining on the garment through repeated washing and drying cycles.
Other features and advantages of the present invention will become apparent to those skilled in the art from the following detailed description. It is to be understood; however, that the detailed description of the various embodiments and specific examples, while indicating preferred and other embodiments of the present invention, are given by way of illustration and not limitation. Many changes and modifications within the scope of the present invention may be made without departing from the spirit thereof, and the invention includes all such modifications.
These, as well as other objects and advantages of this invention, will be more completely understood and appreciated by referring to the following more detailed description of the presently preferred exemplary embodiments of the invention in conjunction with the accompanying drawings, of which:
Unless otherwise indicated, the illustrations in the above figures are not necessarily drawn to scale.
The apparatuses and methods disclosed in this document are described in detail by way of examples and with reference to the figures. Unless otherwise specified, like numbers in the figures indicate references to the same, similar, or corresponding elements throughout the figures. It will be appreciated that modifications to disclosed and described examples, arrangements, configurations, components, elements, apparatuses, methods, materials, etc. can be made and may be desired for a specific application. In this disclosure, any identification of specific shapes, materials, techniques, arrangements, etc. are either related to a specific example presented or are merely a general description of such a shape, material, technique, arrangement, etc. Identifications of specific details or examples are not intended to be, and should not be, construed as mandatory or limiting unless specifically designated as such. Selected examples of apparatuses and methods are hereinafter disclosed and described in detail with reference made to FIGURES.
The present invention relates to a cold transfer pressure sensitive label that can be used instead of heat transfer labels. The pressure sensitive label can be applied on textile surfaces, or any other surface for which heat treatment is unfavorable or unavailable. The pressure sensitive label can remain on the substrate to which it is attached through repeated washing and drying cycles. The pressure sensitive label of the present invention provides a soft, relatively smooth touch and feeling, which adds to the comfort of the wearer.
Throughout this disclosure, the term “layer” refers to the spacial arrangement of a specific type of material or functional components that can be either a continuous layer or a discontinuous layer, one provided in a pattern or uniform configuration or in a random or non-regular arrangement. One layer is “in registration” with another layer when they align correctly with each other according to the desired design or configuration.
Reference is now directed to
While one indicia layer 104 has been provided in
In a further alternative arrangement instead of multiple layers of ink, printable media layers can also be used in place of one or more of the ink layers. A printable media layer can be made of a printable top-coating, a printable polymer film, or any other printable material that can be made as a layer. Throughout this disclosure, we use the term ink “association layer” to refer interchangeably to an ink layer or a printable media layer.
A PSA label in a further exemplary embodiment of the invention includes a layer of a printable media coated with printable release on one surface and a layer of PSA on opposite surface. In storage, a sheet with multiple PSA labels is self wound with the PSA in contact with the printable release of the printable media. U.S. Pat. Nos. 6,352,768 and 5,621,020 disclosed formulations of printable release. Publications, patents, and patent applications are referred to throughout this disclosure. All references cited herein are hereby incorporated by reference.
Optionally, the PSA label can be die cut into the desired shape. The die cut should be done so that each individual label can be easily torn off or separated from the label sheet or web, but each label is still attached to the label sheet before the application onto a substrate surface in disconnected spots. Upon application onto a substrate surface, the PSA label is unrolled first. The PSA label is then attached to the substrate surface with pressure applied through the side of the facestock.
Printed indicia can be created on the printable media before the label is attached onto the substrate surface, or after the label is attached onto the substrate surface. The indicia can be made through a digital printer such as a laser printer or an ink jet printer; an analog printer such as a screen printer or a flexo printer; a gravure printer; a writing instrument such as markers or pens; or any other printing methods. The inks can be liquid or solid. When created for a washable substrate, the indicia is, for example, made of components that are resistant to washing, i.e., which stay on the washable substrate through attachment to the pressure sensitive adhesive or the ink association layer. Examples of such inks include, without limitation, pigment inks formulated with wash durable polymeric binders such as polyurethane or polyacrylates; solid toners used in commercial laser printers such as laser toner from Oki C3200 printer; and dye-based inks used in printers such as HP or Epson printers. Examples of printers include, without limitation, analog printers, including industrial printing presses such as offset, Indigo, or Xeikon press; commercial inkjet and laser label printers, and office or home printers. Other additives, such as optical brightening agent, sparkling dusts, and indicators or taggants for anti-divergence or authentication or indicating purposes can also be added to the ink formulation.
The printed indicia should have good adhesion to the adhesive layer when contacting directly with the adhesive. For applications on a garment that is stretchable and flexible, elastomeric ink components in the ink formulations may be used. Examples of such components include, without limitation, polyurethane and polyacrylates. Commercially available polyurethanes include L2985 and HD2101 from C.L. Hauthaway & Sons Corporation in Lynn city, MA. MATSUMIN 301W from Matsui International Co. in Gardena, Calif. is an example of acrylic based screen printable ink. The ink can be further cross-linked to improve its washability. Suitable cross-linkers include, without limitation, APR 202 from Advanced Polymer inc., Carlstadt, N.J.; and CX-100 from NeoResins inc., Wilmington, Mass.
The layer of release liner provides protection to the PSA surface until the label is ready for use. Any release liner suitable for use with the chosen adhesive can be used. Release liners can be polyolefin film, coated paper or film, and coated super calendared paper, for example. Examples of coating materials suitable for release liners include, without limitation, silicone-based and fluorine-based materials, or any other material that has the desired releasing properties, for example, waxes, acrylates, and carbamates. The same type of coating materials can be used on the second surface of the temporary support in case of a self wound label. Examples of release coatings include, without limitation, SYL-OFF product lines from Dow Corning in Midland, Mich.; PRIMAL R and RHOPLEX R product lines from Dow Chemicals, Midland, Mich.; and DEHESIVE product lines from Wacker Polymer, Allentown, Pa. Examples of suitable release liners include, without limitation, D2 CL PET 7300A/7350A, Grade 27320, and LOPASIL from Loparex LLC, Willowbrook, Ill.; and PP coated casting liner from Felix Schoeller, Pulaski, N.Y.
The pressure sensitive adhesive needs to have sufficient adhesion to the substrate surface so that the label remains on the substrate surface through the normal use and wear of the substrate. For pressure sensitive labels for garment applications, the labels should stay on the garment through repeated washing and drying cycles. The pressure sensitive adhesive should be able to maintain sufficient adhesion to the garment fabric through the washing and drying process. Therefore, in addition to dry adhesion requirements, the present PSA adhesive should maintain wet tack and wet peel strength on the textiles or substrates to which it is applied. Exemplary textiles include, cotton, polycotton, silk, polyester, spandex, nylon and mixtures of them. The surface properties of such textiles or substrates range from highly hydrophilic to highly hydrophobic. Copolymerization of alkyl acrylate with acrylic acid copolymer and component blending of polar and non-polar polymer, resin, surfactant, cross-linker, and other additives have been discovered to ensure wash durability of the adhesive label. When the pressure sensitive label needs to be die-cut, good die pass through of the blade and separation from the surrounding material is also desired. When soaked with water, the adhesive should maintain a peel force of at least about 10 N/in measured with a modified peel test method. The test method will be explained in detail in the test method section. The adhesive is typically coated at about 50 microns to about 200 microns in thickness.
Examples of suitable pressure sensitive adhesives are tackified emulsion polymers, solvent-based polymers, or UV curable polymers. Examples of emulsion polymers include acrylic-based polymers, such as GELVA GME CYTEC 3011, 2397, and 2424 from Cytec Industries, Springfield, Mass.; KIWOPRINT D158, D148 from Kiwo Inc., Seabrook, Tex., AE 5108A, 3413, FT 1147, FT 1149 from Avery Dennison, Painesville, Ohio; and PROHESION 3100, 3200 from Rohm and Haas, Philadelphia, Pa. Examples of solvent-based polymers include I 814 and FT 1158 from Avery Dennison, Pasadena, Calif. Suitable tackifiers include hydrogenated rosin ester based, such as SE-E-720WF from Arakawa Chemical Industries, Ltd. in Osaka. Japan; SNOWTACK 765A and FORAL 85 from Hexion in LaVerge, Tenn.; and PENCEL D-125 from Eastman in Kingsport, Tenn. Tackifiers can be added from 5% to 50%. The pressure sensitive adhesive can be further plasticized. Examples of suitable plasticizers include, without limitation, CITROFLEX A4 and bibutyl sebacate, both from Vertellus Specialties, Indianapolis, Ind. Plasticizers can be added from 3% to 15%. The pressure sensitive adhesive can be further crosslinked. Examples of cross-linkers that can be used for such applications include, without limitation, APR 201, 202, 500 from Advanced Polymer inc., Carlstadt, N.J.; and CX-100 from NeoResins inc., Wilmington, Mass. Cross-linkers can be added from 0.5% to 20%. Emulsion-based polymers have the advantage of low volatile organic compound (VOC) and therefore are preferred in applications where environmentally friendly construction is preferred. Examples of UV-curable adhesives include, without limitation, GELVA GMR 8020-02 from Cytec Industries Inc. in Woodland Park, N.J.
The temporary support needs to have proper adhesion to the ink layer so that ink can be deposited on this support, and yet can be released from this support upon final application onto a substrate surface. We define the adhesion of the ink layer to the temporary support as F1, the adhesion of adhesive to a substrate surface as F2, the adhesion of the adhesive to the release liner as F3, and the adhesion of the ink to the adhesive as F4. The adhesion forces need to satisfy the following relationship:
F1<F2,F3<F1, and F1<F4.
The adhesion forces F1 and F3 can be modified by treatment on the surface of the temporary support and the surface of the PSA release liner respectively. It has been discovered through this invention that the surface energy of the temporary support on the ink contacting side should be between about 20 to about 35 mN/m. A non-silicone based release coating in combination with a matte or textured substrate surface provides good balance of printability and releasing property. Examples of suitable temporary support include, without limitation, printable release coated substrate, such as acrylic-based coating, for example, R130W from Mayzo, Suwanne city, GA; and polypropylene coated sheet, such as HFM sheets from Avery NTP, Pasadena, Calif. The surface energy of the PSA release liner should be about 20 to about 25 mN/m. Silicone coated release typically has surface energy in the lower 20 mN/m range and therefore are good for PSA release, but too low for the temporary support. However, the silicone coated release can still be used as the temporary support with modification of the surface energy by methods known to one skilled in the art, such as corona treatment. Examples of silicone coated release include, D2 CL PET 7300A/7350A, Grade 27320 and 2SLKN and 5.0 MT PET 4400/4400 grade 26967 from Loparex in Iowa, Iowa.
Suitable printable media can be a film or a printable top coating. For garment applications, it is also desirable to use a soft and stretchable material as the printable media layer so that the label can stretch to the same extent as the fabric material. Suitable films include films made of polyurethane, polyethylene terephthalate (PET), ethylene vinyl acetate (EVA), fabric, synthetic leather, suede, foam, specialty paper, polypropylene, polyethylene, polyolefin, inkjet printable media, toner printable media, polyvinyl chloride (PVC), non-pvc film, biodegradable polymers, polylactic acid (PLA), bamboo textile, and other woven and nonwoven materials. Examples of such film materials include, without limitation, Avery printable Fabric from Avery Dennison, Pasadena, Calif.; VIENNA and ELITE, both are laser toner printable and writable synthetic leather from Fifield, Hingham, Mass.; DUREFLEX, an aromatic polyurethane from Deerfield, Bayer material science in South Deerfield, Mass.; HAUTHANE, HD 4664 and L 2985, polyurethane based emulsion, from Hauthaway and Sons Co located in Lynn, Mass.; Neenah paper 9754P0 from Neenah paper in Neenah Wis.; and EVA based MC912Q51 from Bloomer Plastics, Bloomer, Wis.; and WORTHEN PS603P from Worthen, Nashua, N.H.
Various topcoatings can be used as the printable media. U.S. patent application Ser. No. 12/619,652 disclosed such printable topcoating with a flexibility that can match that of a fabric. It is incorporated herein by reference in its entirety.
Other additives, such as pigment, humectant, cross-linking agent, and viscosity modifier can also be added into this printable media layer to improve its performance and processability. TiO2 or hollow sphere polymer suspension, for example, can be added to improve the whiteness of the printable media. The printable media layer can be from about 10 microns to about 500 microns thick.
The label can be created using any process suitable for making such a label. When image-only transfer is needed, i.e., only the imaged area is desired to be left on the substrate, indicia patterning and registration with the adhesive is one important aspect to allow only the imaged area to be applied on textile or target surface. Layer registration between indicia and adhesive can be made by analog or digital cutting or printing, mechanical or optical assisted registration during printing, or utilizing novel process via stencil contact printing, fluid doming, pressure jetting, valving, nozzling, paste dispensing, digital non-contact printing, valve jetting, ultrasonic jetting, ink jetting, powder sprinkling or dry film transfer process. The material components which allow for analog and digital patterning and registration include the indicia forming material as well as the adhesive material, for example, toner or inks that allow for analog or digital printing, and liquid PSA that allows for analog printing or digital dispensing. When using a conventional process for PSA patterning or converting where the tackiness of the PSA can be an issue, the process can be facilitated through using capping or encapsulation techniques. For example, a high softening point tackifier can be utilized to cap or encapsulate the PSA to make the PSA surface non-tacky. This non-tacky surface allows for easier handling, additional printing, direct stacking, self-winding on the PSA or contact with other layers during patterning or converting, and capable of being homogenized with the underlying PSA layers by further heating or other suitable activation means. Other possible PSA activation mechanisms include UV or e-beam pattern curing, chemical reaction activation, or core/shell composite PSA, etc.
An exemplary method of making a label according to the present invention is illustrated in the block diagram 50 of
In another embodiment of the invention, the label can be created according to the process illustrated in Flowchart 500 in
In a further embodiment of the invention, the label can be created using the process as illustrated in Flowchart 5000 in
In addition to the foregoing, the label can be further overcoated with a varnish or other material to provide a glossy appearance or improved washability. This step may occur during the label forming process, after printing, or even after the label has been attached onto a substrate surface.
The elimination of heat from the label application process further enables the incorporation of other functional items or devices into the label that may otherwise be sensitive to heat. Such items or devices include, without limitation, chemical or physical sensing devices, tracking devices, or detection devices. If applied by conventional heat transfer process, those items or devices could be damaged or not function properly due to the heat used in the application process of the transfer to the garment.
The pressure sensitive label of the current invention solves this problem. For example, a RFID tag can be attached to the target textile with the PSA in the transfer label; heat sensitive indicators or taggants, such as irreversible temperature change marker. Other functional components can also be encased in the PSA for product marking or identification purposes. Such components include, without limitation, barcodes, identification components, indication components, sensing components, marking components, tracking components, and authentication components. The PSA label can be further utilized to form a sandwiched structure, such as with a RFID inlay on an adhesive/liner carrier. Taggant, indicator, or sensor components such as irreversible thermochromic indicator can be similarly attached or sealed in with the current label construction at ambient temperature as part of the adhesive transfer label.
The label created with the current invention can also be used for other applications that need suitable wet adhesion. Such applications include fabric patches, uniform badges etc. In using as a fabric patch, a piece of fabric or other suitable carrier with the desired pattern printed on the surface is coated with pressure sensitive adhesive with the wet adhesion value greater than about 10 N/in. The patch can be used to patch up torn garments or to decorate the substrates it is applied on.
Without limitation, other additives, for example, surfactants, defoamers, dispersants, wetting agents, dyes, pigments, and co-solvents known to those skilled in the art can be added to the composition of each of the layers.
Test Methods
Wet Adhesion Test
The wet adhesion test measures the peel force required to remove the adhesive coated substrate from a test panel under wet condition using Instron 5542. A pressure sensitive adhesive is coated at 4 mils dry thickness on Mellinex 455-2 mil Mylar which is an uncoated PET carrier, and cut into 1″ by 4″ strips. The PSA is then applied on Atletico Home FA10—a red dyed 100% polyester fabric from Far Eastern Textile in Taiwan of 1″ by 8″ strips, with a 1″ by 4″ adhesive free end. The test strip is laminated on a stainless steel test panel from Cheminstruments through the PET side using a double side tape FT 530 from Avery Dennison with a 4″ free end, the same region as the adhesive free end. One pass with a 2-kilogram rubber covered steel roller on the Cheminstruments Rolldown machine was used to laminate the strip to the test panel. The laminated test specimens are conditioned for 48 hours at room temperature. The test specimen is then saturated with DI water at room temperature for 5 minutes. The free end of the test strip is attached to the jaws of the Instron. The test is conducted at 90 degree angle. The peel rate is 12 inches per minute. Test was repeated with two sets prepared from the same material batch.
Dry Adhesion Test
The dry adhesion test measures the peel force required to remove the adhesive coated substrate from a test panel under dry condition using Instron 5542. The test method is similar to the wet adhesion test with elimination of the step where the test specimen is saturated with DI water at room temperature for 5 minutes. A pressure sensitive adhesive is coated at 4 mils dry thickness on Mellinex 455-2 mil Mylar, which is an uncoated PET carrier, and cut into 1″ by 4″ strips. The PSA is then applied on Atletico Home FA10-a red dyed 100% polyester fabric from Far Eastern Textile in Taiwan of 1″ by 8″ strips, with a 1″ by 4″ adhesive free end. The test strip is laminated on a stainless steel test panel from Cheminstruments through the PET side using a double side tape FT 530 from Avery Dennison with a 4″ free end, the same region as the adhesive free end. One pass with a 2-kilogram rubber covered steel roller on the Cheminstruments Rolldown machine was used to laminate the strip to the test panel. The laminated test specimens are conditioned for 48 hours at room temperature. The free end of the test strip is attached to the jaws of the Instron. The test is conducted at 90 degree angle. The peel rate is 12 inch per minute. Test was repeated with two sets prepared from the same material batch.
Washing and Drying Test
Wash resistance of the label construction on textile or target substrates can be verified by American Association of Textile Chemists and Colorists (AATCC) test method 124. The laundry test uses a Maytac Atlantis washer and dryer. Warm water is about 105° F. and hot water is about 120° F. The test specimen is evaluated for any visible defects including edge lifting, wrinkling, cracking or color fading.
Rheology Dynamic Shear Test
The dynamic shear test was conducted using TA Instruments AR2000 with about 8 millimeters parallel plates. Temperature sweep from about −60° C. to about 200° C. was conducted with 10 rad/sec frequency and 3° C./sec heating rate.
Viscosity Test
The viscosity is measured using Brookfield viscometer with spindle 5 and under 10 rpm.
The chemicals used in the following examples are listed in Table 1 with information on the function, manufacturer and location of each.
This exemplary formulation contains L2985, Print Gen MG, GR B2, and Ti-Pure R-746 TiO2. The following procedure is used to create this ink formulation: Using a Caframo electric lab mixer, about 80 grams (g) of L-2985 is mixed with about 30 grams of Ti-Pure R-746 TiO2 for a few minutes. Then about 10 g of Print Gen MG is added and mixed using the mixer. Lastly, about 6 g of GRB2 is added and mixed for few minutes.
100 g of AQ white base is mixed with 3.5 g of AQ cross-linker first to create a paste with 7600 cps viscosity. 1.5 g of Borchi Gel L75N thickener is then added to the paste to create a white ink formulation with a viscosity of 17000 cps.
Examples 3 to 14 are additional examples of white ink formulation which are summarized in table 2. The ingredients are added in the same procedure as described in example 1.
I-814 is made with the following formulation by weight: toluene at 20.05%, Heptane at 6.01%, Foral 85 at 20.54%, Staybelite Ester 3 at 3.32%, RC 7110 BHT AO at 0.28%, and Aroset 1085 at 49.80%. The formulation is further modified as following to make the final PSA: about 80 g of I-814 and about 10 g CITROFLEX A4 are mixed with a mixer at high speed.
About 70 g of CYTEC GME3011, about 30 g SNOWTACK 765A, about 2 g APR202, and about 0.8 g BORCHI Gel L75N are mixed with a mixer at medium speed.
About 2400 grams of KIWOPRINT acrylic PSA D158, about 600 g of SE-E-720WF, about 36 g of BYK-19, about 24 g of BYK-24, about 90 g of RESPUMIT BA 2000, and about 30 g of BORCHI Gel L75N are mixed with medium speed mixer for a PSA with viscosity of 16500 cps.
About 1095 g of GME 3011, about 375 g of SE-E-720WF, about 13.2 g of BYK-19, about 8.8 g of Byk-24, about 22 g of RESPUMIT BA 2000, and about 7 g of BORCHI Gel L75N are mixed with medium speed mixer for a PSA with viscosity of 19000 cps.
Examples 19 to 41 are additional examples of the pressure sensitive adhesive. Table 3 summarized the formulations. The ingredients are mixed in the similar procedure as described in the previous examples.
Adhesive from example 27, commercially available KIWOPRINT D-158, and FT 1149 are subject to wet and dry adhesion test respectively. For adhesive in example 27, the wet adhesion is 14.54 N/in in average and the dry adhesion is 17.92 N/in in average. For KIWOPRINT D-158, the wet adhesion is 0 N/in in average and the dry adhesion is 8.82 N/in in average. For FT 1149, the wet adhesion is 1.84 N/in in average and the dry adhesion is 12.74 N/in in average. When using preshrunk cotton of Hanes heavyweight white T-shirt in place of the red dyed 100% polyester fabric, adhesive from example 27 shows wet adhesion 9.95 N/in in average and the dry adhesion 16.38 N/in in average.
The rheology properties of some of the adhesives are summarized in Table 4.
RA668W was coated on HFM PET at 20 gsm. The coating is dried at about 100° C. for about 10 minutes. Additional examples are listed in table 5.
An indicia is printed on Neenah paper 9754P0 using Laser toner printer OKI C3200n. Solvent-based FT 1158 coated on silicone release liner from Avery Dennison is then laminated with the Neenah paper on the side opposite to the toner printed side. The laminate is then cut around the printed image using a Roland plotter cutter. The cutting cuts through the Naanah Paper and the adhesive, but not through the silicone liner. The excess areas on the Neenah paper is removed to leave only the laser toner printed image on the silicon liner.
The temporary support used was 105 microns thick Smartrans matt CGR polyester film from Hanse Corp. (Kyunggi, South Korea) coated with 54.14 release coating (NTP, Gaupe, Norway). White ink formulation from example 2 with a viscosity of 17000 cps was printed on the temporary support using a flatbed ATMA printer (ATMA Champ Ent Corp., Taipei, Taiwan) with 48 mesh screen for 2 passes to obtain 25 microns white pattern thickness. The printed ink was dried in drying tunnel at 105° C. for 60 sec. The same screen printer with a 48 mesh screen was used for printing the PSA formulation from example 17. A total of 6 passes was used for a 60 microns adhesive thickness. Drying was done in drying tunnel set at 105° C. for 60 sec. The printed transfer label sheets were cured for 6 hrs at 65° C. The total label transfer label thickness obtained was 190 um.
A digital toner image is printed on a polypropylene laser toner transfer sheet using an Oki C3200n laser toner printer. A polyurethane based printable media from example 1 is coated on this printed sheet at about 20 microns thickness. A PSA of example 15 with about 70 gsm coating weight on a silicone liner is then laminated to the polyurethane coated print sheet. The laminate is then cut around the toner image using a rotary die. The silicone release liner is peeled off the label to expose the pressure sensitive adhesive.
Neenah paper 9754P0 is laminated with the PSA of example 15 after peeling off the carrier sheet on the newly exposed side. The label is marked with a permanent marker such as Sharpie or Mark-a-Lot (by Avery Dennison).
About 2 mils of white formulation in example 4 is coated on PP release liner, and dried at about 90° C. for about 1 min. Then about 10 mils of PSA of example 17 is coated on top of white layer and dried at about 100° C. for about 3 hrs. The sample is then laminated with a silicon liner on top of the PSA. The sample is then die cut with the reversed image of N-shape die punch.
This example uses white formulation of example 10, adhesive formulation of example 16, and temporary support formulation of example 46. The formulation of example 46 is coated on matte-coated HFM PET sheet with about 20 microns thickness and dried at about 100° C. for about 2 minutes to create the temporary support. The white ink and adhesive are coated using the same process and parameters as described in example 56.
This example uses the white ink formulation of example 2, the adhesive formulation of example 18, and the same temporary support and process as example 53.
Each label from example 52 to 58 is placed on the Atletico Home FA10 polyester fabric with the following procedures. First, the silicon liner is peeled off to reveal the PSA layer. The label is then attached to a polyester fabric of about 4″×5″ dimension. The sample is then placed under a press setup of about 80 psi for about 10 sec. Lastly, the temporary support is peeled off. The sample is conditioned at room temperature for 48 hours. The fabric with the label attached is then tested using the washing and drying method about 5 times. All examples show no visible change such as discoloration, wrinkling, or edge lift.
This example uses HFM PET sheet coated with example 43 at 20 gsm as the temporary support, AQ white base with 4% APR 202 as a white ink layer at 25 micron thickness, and example 27 as the adhesive. A 1″ by 8″ strip of the label sample was cut and laminated on a stainless steel panel from Cheminstruments through the adhesive side with a 4″ free end. The free end was attached to the jaws of the Instron 5542 for a 90 degree peel test at 12 inch per minute peel rate. An average peel force (F1) of 2.89 N/in was recorded for peeling the temporary support off the label. The same sample was laminated onto a stainless steel panel using double side tape through the HFM PET side. A silicone coated PET release was used to laminate on the adhesive side. The peel force (F3) was 0.07 N/in for peeling the silicone coated PET release liner off the adhesive side. This example illustrates that the adhesion of the PSA release to the PSA (F3) is smaller than that of the temporary release to the ink layer (F1). And that the adhesion force of temporary release to the ink layer (F1) is smaller than that of the adhesive to the final substrate (F2), even under wet condition, which is at least around 10 N/in.
All of the features disclosed in the specification, including the claims, abstract, and drawings, and all of the steps in any method or process disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive. Each feature disclosed in the specification, including the claims, abstract, and drawings, can be replaced by alternative features serving the same, equivalent, or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.
The foregoing detailed description of the present invention is provided for purposes of illustration, and it is not intended to be exhaustive or to limit the invention to the particular embodiments disclosed. The embodiments may provide different capabilities and benefits, depending on the configuration used to implement the key features of the invention. Accordingly, the scope of the invention is defined only by the following claims.
