Image-receiving sheet for thermal image transfer, method of its manufacturing and compound for coating (versions)

FIELD: soft wares, paper.

SUBSTANCE: invention concerns polymerous sheet perceiving thermally embossed image, on which with help of pigments or inks heat transmission it is capable to record an image with high contrast and definition. Image-receiving sheet for thermal image transfer contains lamellar basis with perceiving embossing image resinous layer. Current layer is coated by aquatic compound, which includes at least one water-dispersible resin on the basis of aliphatic (polyether)-polyurethane and at least one water-dispersible resin on the basis of aliphatic (polyester)-polyurethane or resin water dispersion on the basis of aliphatic (polyether)-polyurethane, silicon dioxide dispersion and wax anionic aqueous emulsion, and also aquatic coupling agent. Proposed invention provides receiving of perceiving layer with aquatic compounds usage, with image formation of high contrast range and storage stability.

EFFECT: receiving of perceiving layer with aquatic compounds usage, with image formation of high contrast range and storage stability.

20 cl, 1 dwg, 2 tbl, 2 ex

 

The technical field to which the invention relates.

The present invention relates to a receiving sheet for thermal transfer image. In more detail, the present invention relates to a sheet receiving thermally printed image, on which heat transfer dye or ink, you can record images with high contrast and resolution.

The level of technology

In recording systems such as thermal, ink ribbon is heated by thermal head or a laser or similar device based on image content. Heating causes thermal melting, thermal diffusion or sublimation, in which the dye is transferred from the ink ribbon to the sheet for printing with the formation of its image.

The sheet for printing in General is made of a film base, which caused the dye receptive layer. Perceiving the dye layer means a layer which receives the dye or ink, transferred to it from the ink ribbon by heating, and stores the obtained image. Typical dye receptive layers for polymer substrates (substrates) include at least one dye receptive resin dissolved in an organic solvent. Examples of the same is soluble in organic solvents resins include complex polyester, polycarbonate, polyvinyl chloride, copolymers of vinyl chloride such as a copolymer of vinyl chloride and vinyl acetate, as well as thermoplastic resins such as polyurethane resin, resin-based polyacrylate copolymer and styrene (as) - based copolymer of Acrylonitrile, butadiene and styrene (ABS), etc.

Currently, there is a need for reducing or eliminating the use of volatile organic solvents in the production process of the polymer, perceiving the image (foster) sheets. First of all, there is a need for the use of aqueous compositions for the preparation of a receptive layer on a polyester substrate without reducing contrast and image stability during storage.

Disclosure of inventions

In accordance with one aspect of the present invention proposed a sheet for printing this type, which is used in a system for thermal (thermocapillary). The sheet for printing includes a polymeric film base and a receptive layer image formed on the film base. Perceiving the image layer is formed by coating using aqueous compositions for coating. In one embodiment, the aqueous composition for coating may include an aqueous dispersion of aliphatic (complex polyester-polyurethane and the water dispersion of Alif the political (easy polyester-polyurethane. In yet another embodiment, the aqueous composition for coating may include an aqueous dispersion of resin-based aliphatic (easy polyester-polyurethane dispersion of silica and anionic aqueous emulsion of wax. In the aqueous composition for coating, you can add water a crosslinking agent, and then, the resulting composition can be dried.

In accordance with another aspect of the present invention proposed perceiving the dye composition for coatings. In one embodiment, perceiving the dye composition for coating may include an aqueous dispersion of aliphatic (complex polyester-polyurethane and the water dispersion of aliphatic (easy polyester-polyurethane. In yet another embodiment, perceiving the dye composition for coating may include an aqueous dispersion of resin-based aliphatic (easy polyester-polyurethane dispersion of silica and anionic aqueous emulsion of wax. In perceiving the dye composition for coatings, you can add water a crosslinking agent, and then, the resulting composition can be dried.

In accordance with another aspect of the present invention, a method for manufacturing a receiving sheet for thermal transfer image (sheet perceiving thermally transferred image). The method consists of coating on poverchnostnich-basics using aqueous compositions for coating and drying aqueous compositions for coating with the formation of the receiving sheet for thermal transfer image.

Brief description of drawings

The drawing shows a schematic cross-section of the receiving sheet for thermal transfer image according to the present invention.

The implementation of the invention

The present invention is described with reference to the drawing, which schematically shows a cross section of one example of a receiving sheet 1 for thermal transfer image according to the present invention. Receiving the sheet 1 for thermal image transfer sheet includes a base (substrate), hereinafter called the leaf-base 2, and a dye receptive layer 3 located on the surface of the carrier sheet 2.

The leaf-base 2 formed of sheet material, which is selected depending on the specific criteria in this application. Such criteria include, for example, the required dimensions (height, length and thickness), the surface structure, composition, flexibility and other physical properties or economic aspects. Suitable sheet materials include, for example, paper, synthetic fibers, such as fibers of polyolefin type, polystyrene type; paper, containing wood, paper art print, coated paper, paper machine coating, Wallpaper, cover paper, paper of cellulose fibers, such as paper, cardboard, various poly is Ernie films or sheets, such as polyolefin, polyvinyl chloride, polyethylene terephthalate, polystyrene, polymethacrylate and polycarbonate.

In one variant embodiment of the invention, the sheet base 2 may represent or include a multilayer polymeric sheet. Multilayer materials are coextruding or form a lamination. In yet another embodiment, the sheet base 2 includes both types of multilayered materials obtained by coextruding and lamination.

In addition, an opaque white film can be obtained by adding a white pigment and similar fillers in one or more of the above synthetic resins, and the resulting material is used as the carrier sheet 2. In one embodiment, as the carrier sheet 2 use a porous film, which is formed by a standard expansion method. In yet another embodiment, the sheet base 2 is a multilayer product, which is obtained by combining many of the above single-layer sheet obtained from the above materials. Examples of such multilayer products include multi-product from pulp and paper and synthetic paper, a multilayer product of cellulose fibers and a polymeric film or sheet.

The thickness of the carrier sheet 2, obtained as described above, is determined depending on the required specific criteria. Such criteriology characteristics of the product desired destination. In one variant embodiment of the invention the thickness of the sheet is in the range from approximately 10 μm to approximately 300 μm. In yet another embodiment, the thickness of the sheet is in the range from approximately 10 μm to approximately 150 μm. In another embodiment, the thickness of the sheet is in the range from about 150 microns to about 300 microns.

To increase friction between the sheet base 2 and the dye receptive layer 3 formed on the surface of the carrier sheet 2, you can use processing primer or treatment by corona discharge.

To improve pre-selected properties, you can use an intermediate layer (not shown)located between the dye receptive layer 3 and the sheet-base 2. Such properties include bonding ability, the whiteness or brightness, cushioning properties, antistatic properties, shielding properties, antisaccade action, etc.

You can also use the bottom layer (not shown)deposited on the bottom surface of the carrier sheet 2 opposite to the surface on which is deposited dye receptive layer 3. The bottom layer is used to improve the pre-selected properties of the receiving sheet 1 for thermal image transfer. Such properties include, for example, improved suitability for processing in the pipeline improved properties when printing, resistance to contamination, antisaccade properties, etc. If necessary on the receiving dye layer 2 or on the lower protective layer can be applied to the antistatic layer (not shown)containing a commercial antistatic preparation, with the aim of providing antistatic properties of the receiving sheet for thermal transfer image.

As the receiving dye layer 2, you can use the coating formed from the aqueous composition. In one variant embodiment of the present invention the aqueous composition for coating includes at least one dispersible in water, aliphatic resin based (easy polyester-polyurethane and at least one dispersible resin in water-based aliphatic (complex polyester-polyurethane. Resin-based (easy polyester-polyurethane and resin-based (complex polyester-polyurethane is mixed in the composition for coatings in the form of a separate aqueous compositions. Dispersion usually include colloidal dispersion of particles of polyurethane polymers. In one embodiment, perceiving the dye composition for coating is characterized by a mass ratio of resin-based (easy polyester-polyurethane to the resin-based (complex polyester-polyurethane in the range of from about 1:1 to about 2:1 or from about 2:1 to priblizitel is but 3:1 per mass of solid (easy polyester-polyurethane and complex polyester-urethane.

In yet another embodiment, the aqueous composition for coating consists of an aqueous dispersion resins based on aliphatic (easy polyester-polyurethane dispersion of silica and anionic aqueous emulsion of wax.

In another embodiment of the polymer-based complex polyester-polyurethane use the product of the interaction of predominantly aliphatic polyisocyanate component with lonefire-polyol as one component. The term "predominantly aliphatic"used in this context means that at least 70 wt.% polyisocyanate component is aliphatic component, in which all the isocyanate groups are directly linked to aliphatic or cycloaliphatic groups, regardless of the content of aromatic groups. More preferably, the amount of aliphatic MDI is at least 85 wt.% and most preferably 100 wt.% of the mass of the polyisocyanate component. Examples of suitable aliphatic polyisocyanates include atlantaatlanta, 1,6-hexamethylene-diisocyanate, isophoronediisocyanate, cyclohexane-1,4-diisocyanate, 4,4-dicyclohexylmethane, cyclopentylpropionate, parametermarkerpattern (p-TMTDI) and its meta isomer (m-TMTDI), hydrogenated 2,4-colorvision and 1-isocyanato-1-methyl-3(4)-isocyanatomethyl the San (IMCG). You can also use a mixture of aliphatic polyisocyanates.

Ester polyols used in the composition lonefire-polyol as one component, include containing terminal hydroxyl group interaction products, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, neopentylglycol, 1,4-butanediol, 1,6-hexanediol, furandione, cyclohexanedimethanol, glycerin, trimethylolpropane or pentaerythritol or mixtures thereof. Used as polycarboxylic acids, especially dicarboxylic acids, and their derivatives, which form esters. Examples include succinic, glutaric and adipic acids and their methyl esters, phthalic anhydride dimethylterephthalate. Also use polyester resins formed by the polymerization of lactones, such as caprolactone, in combination with the polyol. Commercial preparations (ester)-polyurethanes used in the present invention include the products sold under the trade names of Avalure UR-425, Avalure UR-430, Avalure UR-405 and Avalure UR-410 company Goodrich Corporation (Charlotte, NC), and Neorez R-989 company NeoResins (Waalwijk, the Netherlands).

In one embodiment of the polymer-based (easy polyester-polyurethane use the product of the interaction of predominantly aliphatic polyisocyanate component, with (easy polyester-polyol as one component. The prigoda the haunted aliphatic polyisocyanates described above. Suitable (easy polyester-polyols include the polymerization products of cyclic oxide, or the products obtained by addition of one or more such oxides to polyfunctional initiators. Such polymerizable cyclic oxides include, for example, ethylene oxide, propylene oxide and tetrahydrofuran. Such polyfunctional initiators, to which add the oxides include, for example, water, ethylene glycol, propylene glycol, diethylene glycol, cyclohexanedimethanol, glycerin, trimethylolpropane, pentaerythritol and bisphenola (such as a and F).

Suitable polyesters include polyoxypropylene and trioli, poly(oksietilenom-oxypropylene) diols and trioli formed by simultaneous or sequential addition of ethylene or propylenoxide to appropriate initiators; and glycols simple ester polytetramethylene formed by polymerization of tetrahydrofuran. Commercial (easy polyester-polyurethanes used in the present invention include the products sold under the trade names of Sancure 878, Avalure UR-450 and Sancure 861 company Goodrich Corporation (Charlotte, NC), and Neorez R-551 firm NeoResins (Waalwijk, the Netherlands).

Perceiving the dye layer 3 may include dispersible in water crosslinking agent. Suitable dispersible in water, multifunctional, chemically-activated cross-linking agents are the available from commercial sources. Such crosslinking agents include dispersible polyfunctional compounds of aziridines, isocyanates, methylamino resins, epoxides, oxazolines, carbodiimides and other polyfunctional cross-linking agents. In one embodiment, the crosslinking agent is added in an amount of from about 0.1 part to about 10 parts per 100 parts of the total mixture of solid substances.

In yet another embodiment, a crosslinking agent is added in an amount of from about 0.2 part to about 5 parts per 100 parts of the total mixture of solid substances. Adding cross-linking agents in the dispersion composition of the polyurethane is formed vzaimopronikayut and interconnected network containing cross stitched matrix, which connects the polymers covalent and/or non-covalent bonds.

Perceiving the dye layer 3, which is formed, as described above, is characterized by a pre-selected thickness depending on such factors as viscosity, type of application, amount and method, the desired destination, etc. In one embodiment, the sheet thickness ranges from approximately 1 μm to approximately 50 μm. In yet another embodiment, the thickness of the sheet ranges from approximately 1 μm to approximately 25 μm. In another embodiment, the thickness of the sheet ranges from about 25 microns to about 50 microns.

The receiving sheet for thermal case the images can be applied to products on which you are printing. Suitable products include perceiving the image of the sheet in flat form or in the form of rolls, cards and sheets to produce clear patterns (transparent printed forms). By selecting the parameters that define the sheet base 2, you can create perceiving the image sheet 1 the required destination.

Examples

The following examples are provided only to illustrate the methods and variants of the embodiment of the present invention and do not limit its scope, which is defined in the claims. Unless specified otherwise, all ingredients are commercial products of such well-known manufacturers, like Sigma Aldrich, Inc. (St. Louis, MO) or Fisher Scientific International, Inc. (Hanover Park, IL).

Example 1

Composition for coating, the composition of which is presented in table 1, was obtained as follows. Equal amounts of water and dispersion of the mixture of polyurethanes add at the same time, that is, 100 parts of water to 100 parts of dispersion.

Then, the resulting composition for coatings applied to translucent biaxial-oriented canvas-based polyethylene terephthalate (PET). The thickness of the blade is approximately 25 microns. The coating is dried at a temperature of 90°and when the linear velocity of 120 m/min, by perceiving the image layer. Surface dry density is about coverage of the receptive layer is in the range of from about 0.8 g/m 2to approximately 1 g/m2.

The composition of the coating obtained in example 1 is applied also to Matt, chrome, biaxially oriented PET base thickness of 50 μm and biaxially oriented PET-based white thickness of 50 μm.

Table 1.
The composition obtained in example 1
Ingredientwt.%
Dispersion of polyurethane (Neorez R-551: dispersion of aliphatic (easy polyester-urethane, 35,5% (based on dry weight)70
Dispersion of polyurethane (Neorez R-989: dispersion of aliphatic (complex polyester-urethane, 40% (based on dry weight)29,9
A crosslinking agent (a Crosslinker CX-100: a crosslinking agent based on polyfunctional of aziridine)0,1

Example 2

Composition for coating, the composition of which is presented in table 2, was obtained as follows. The ingredients are mixed until a homogeneous mixture and put on a canvas-based method is basically similar to the method described in example 1. Canvas-based PET coated can be used for printing on a laser printer and using the cured UV inks.

Table 2.
The composition obtained in example 2
Ingredientwt.%
Dispersion of polyurethane (Neorez R-563: dispersion of aliphatic (easy polyester-urethane, 35,5% (based on dry weight)48,4
Dispersion of silicon dioxide (Polymer Product - FP 44)0,5
Anionic aqueous emulsion of mixed waxes (Aquacer 537: amerosport)1,0
A crosslinking agent (a Crosslinker CX-100: a crosslinking agent based on polyfunctional of aziridine)0,1
Water50,0

Aquacer 537 is a commercial product of the company Byk-Cera, which is a subsidiary of the company Byk-Chemie, Altana AG (Bad Homburg, Germany), and is a 2-Diethylaminoethanol.

Although the present invention is described in the form of variants of the embodiment, it should be understood that various modifications of the above options, which are obvious to a person skilled in the art. Therefore, it should be considered that are described in this context, the invention includes all such minor modifications are included within the scope of the invention as defined in the claims of the present invention.

1. A receiving sheet for heat is th image transfer, characterized in that it contains a sheet with perceiving damage the image of the resinous layer is formed by covering drying aqueous composition, including at least one dispersible resin in water-based aliphatic (easy polyester-polyurethane and at least one dispersible resin in water-based aliphatic (complex polyester-polyurethane or water dispersion of resin-based aliphatic (easy polyester-polyurethane dispersion of silica and anionic aqueous emulsion of wax and water crosslinking agent.

2. The sheet according to claim 1, characterized in that the sheet base contains a complex polyester.

3. The sheet according to claim 2, characterized in that the complex polyester is polyethylene terephthalate.

4. The sheet according to claim 1, characterized in that the resin-based (easy polyester-polyurethane contains the product of the interaction of aliphatic polyisocyanate component and (easy polyester-polyol as one component.

5. The sheet according to claim 1, characterized in that the resin-based (complex polyester-polyurethane contains the product of the interaction of aliphatic polyisocyanate component and (complex polyester-polyol as one component.

6. The sheet according to claim 1, characterized in that the thickness of the receptive image resinous layer is from about 1 to about 50 microns

7. Perceiving the dye composition for coatings containing at least one aqueous dispersion of resin-based aliphatic (easy polyester-polyurethane and at least one aqueous dispersion of resin-based aliphatic (complex polyester-polyurethane.

8. The composition according to claim 7, further containing a polyfunctional crosslinking agent.

9. The composition according to claim 8, in which the polyfunctional crosslinking agent comprises a polyfunctional aziridine.

10. The composition according to claim 7, mainly containing organic solvents.

11. The composition according to claim 7, in which the mass ratio of these components is in the range from 1:1 to 3:1 based on dry weight of resin.

12. The composition according to claim 7, in which the aqueous dispersion of resin-based (easy polyester-polyurethane contains the product of the interaction of aliphatic polyisocyanate component, with (easy polyester-polyol as one component.

13. The composition according to claim 7, in which the aqueous dispersion of resin-based (complex polyester-polyurethane contains the product of the interaction of aliphatic polyisocyanate component, with (complex polyester-polyol as one component.

14. Perceiving the dye composition for coatings containing the water dispersion of resin-based aliphatic (easy polyester-polyurethane dispersion of silicon dioxide and nionoy aqueous emulsion of wax.

15. The composition according to 14, further containing a polyfunctional crosslinking agent.

16. The composition according to item 15, in which the polyfunctional crosslinking agent comprises a polyfunctional aziridine.

17. The composition according to 14, mostly do not contain organic solvents.

18. The composition according to 14, in which the anionic aqueous emulsion of a wax contains 2-Diethylaminoethanol.

19. The composition according to 14, in which the aqueous dispersion of aliphatic (easy polyester-urethane contains the product of the interaction of aliphatic polyisocyanate component, with (easy polyester-polyol as one component.

20. A method of manufacturing a receiving sheet for thermal transfer image, characterized in that the sheet on the basis of the applied aqueous composition for coating according to claim 7 or 14, and then dried with the formation of perceiving damage the image of the coating layer.



 

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