JP2841198B2 - Heat transfer sheet for transmissive manuscript creation - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a heat-transferable sheet for producing a transmission type original.

[Conventional technology]

The thermal recording method of recording desired information by heating the thermal transfer sheet with a thermal head and transferring dyes and the like on the thermal transfer sheet onto the thermal transfer sheet is used as information recording means in various fields,
In recent years, it has also been used for creating transmissive originals used in projection devices such as overhead projectors (hereinafter abbreviated as OHP). As a heat-transfer sheet for creating a transmission-type original used when performing this type of transmission-type original by the thermal recording method, usually, on the surface of a sheet-like substrate made of polyethylene terephthalate having a thickness of about 100 μm, A structure in which a transparent receiving layer for receiving a migrating dye or the like is formed is used.

[Problems to be solved by the invention]

However, the heat transfer sheet of the conventional heat transfer sheet described above tends to curl due to the heat generated during transfer by the thermal head, causing distortion in the projected image when subjected to OHP, and in particular, repeated printing such as color transfer printing. In the case of performing the above, there are problems that not only the curl becomes severe, the distortion of the projected image becomes severe, but also a color shift occurs in the image transferred and recorded on the receiving layer.

[Means for solving the problem]

The present invention has been made in view of the above points, and does not cause curl due to heat at the time of image transfer by a thermal head, causes color shift in an image transferred on a receiving layer, or projects when subjected to OHP. An object of the present invention is to provide a heat transfer sheet for producing a transmission type original which can create a transmission type original without causing distortion in an image.

That is, the present invention provides: (1) transparency in which a thermoplastic resin sheet is heated to a temperature equal to or higher than a softening temperature in a non-tension state, and a heat shrinkage when the sheet is heated to a temperature equal to or higher than a softening temperature is 2 to -1%. A heat-transferable sheet for producing a transmissive original, comprising: a base material; and a transparent receiving layer provided on one surface of the base material and receiving a dye transferred from the heat transfer sheet by heating.

(2) The heat-transferable sheet according to claim 1, wherein a cushioning transparent resin layer is provided between the transparent substrate and the transparent receiving layer.

(3) The transmission type according to (1) or (2), wherein a support sheet is releasably provided on the surface of the transparent substrate opposite to the surface on which the receiving layer is provided via an adhesive layer. Heat transfer sheet for manuscript creation.

(4) The heat-transferable sheet for producing a transparent original according to claim 3, wherein the pressure-sensitive adhesive layer is made of a weakly pressure-sensitive adhesive.

(5) The heat-transferable sheet for producing a transmissive original according to (3) or (4), wherein the pressure-sensitive adhesive layer is partially provided.

(6) The pressure-sensitive adhesive layer is provided by changing the application amount of the pressure-sensitive adhesive continuously or discontinuously.
5. The heat-transferable sheet for producing a transparent original according to any one of the above.

It is the gist.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a heat transfer sheet 1 for producing a transparent original according to the present invention. The heat transfer sheet 1 is provided on one surface of a transparent substrate 2 with a transparent resin layer 3 having a cushioning property and a transparent receiving layer 4 interposed therebetween. Further, a support sheet 6 is provided on the side of the transparent substrate 2 opposite to the side on which the receiving layer 4 is provided via a pressure-sensitive adhesive layer 5 so as to be releasable.

As the transparent substrate 2, a thermoplastic resin sheet is heated to a softening temperature or higher in a non-tension state to a heat shrinkage of 2 or more.
-1%, preferably 1.5-0% is used. The heat shrinkage of the substrate 2 is a shrinkage in the sheet flow direction and the width direction when the sheet is heated to a temperature equal to or higher than the softening temperature. As the thermoplastic resin, polyethylene terephthalate, polyolefin, polyvinyl chloride, polyvinylidene chloride, polystyrene, polycarbonate,
Polyphenylenesulfan, polyethersulfone,
A highly transparent resin such as an acrylic resin such as polyetheretherketone, polyetherimide, polyarylate or polymethylmethacrylate is preferable, but a resin having high heat resistance is particularly preferable, and polyethylene terephthalate is usually used. The transparent substrate 2 preferably has a thickness of 30 to 200 µ, particularly preferably 50 to 150 µ.

When the transparent base material 2 is made of a resin having high rigidity such as polyethylene terephthalate, the printing density is lowered due to the rigidity of the base material 2 and the transfer of the heat transfer sheet 1 in the printing apparatus becomes difficult, so that the cushioning property is obtained. It is preferable to provide the transparent resin layer 3 described above. The transparent resin layer 3 lowers the rigidity of the base material 2 so that the heat transfer sheet 1 can be smoothly fed in the printing apparatus, and can increase the printing density by the cushioning property of the transparent resin layer 3. The resin constituting the transparent resin layer 3 preferably has a 100% modulus value of 150 kg / cm ² or less, for example, polyester, vinyl chloride-vinyl acetate copolymer, acrylic resin, polyvinyl acetate, ethylene-vinyl acetate copolymer. Thermoplastic resin such as polymer, alkyl titanate, vinyl acetate-acryl copolymer, polyethylene imine, polyvinyl chloride, polybutadiene, polyethylene, ethylene-acryl copolymer, polypropylene, ionomer resin, polystyrene, polyurethane elastomer or polyurethane, epoxy And the like. If necessary, additives such as a curing agent may be added to the resin. In addition to the above resins, an ultraviolet curable resin, an electron beam curable resin, or the like can be used. The transparent resin layer 3 can be formed of an adhesive substance or an adhesive made of the above resin.
Examples of the method for forming the transparent resin layer 3 include extrusion coating, hot melt coating and the like in addition to ordinary coating, but it may be formed by other coating methods. The thickness of the transparent resin layer 3 is preferably 1 to 200 μm.

As a material constituting the transparent receiving layer 4, a material capable of receiving an image of a dye migrating from a thermal transfer sheet, for example, a sublimable disperse dye, and maintaining an image formed by the reception is used. Any material can be used as long as it is used in the receptor layer of this type of thermal transfer sheet. Such materials include, for example, the following synthetic resins (a) to (e) alone or a mixture of two or more.

(A) Those having an ester bond.

Polyester, polyacrylate, polycarbonate, polyvinyl acetate, styrene acrylate resin,
Vinyl toluene acrylate resin, etc.

(B) Those having a urethane bond.

 Polyurethane and the like.

(C) Those having an amide bond.

 Polyamide (nylon, etc.).

(D) Those having a urea bond.

 Urea resin and the like.

(E) Others having a highly polar bond.

Polycaprolactone, polystyrene, polyvinyl chloride, polyacrylonitrile, etc.

The transparent receiving layer 4 is made of saturated polyester and vinyl chloride.
It can also be composed of a mixed resin with a vinyl acetate copolymer. In this case, the vinyl chloride-vinyl acetate copolymer has a vinyl chloride component content of 85 to 97% by weight and a degree of polymerization of 200 to 800.
Are preferred. The copolymer is not limited to a copolymer of vinyl chloride and vinyl acetate alone, but may be a copolymer containing a vinyl alcohol component and a maleic acid component.

Further, the transparent receiving layer 4 can be made of a styrene resin other than the polystyrene. Examples of the styrene-based resin include homopolymers or copolymers of styrene-based monomers such as styrene, α-methylstyrene and vinyltoluene, or these styrene-based monomers and other monomers such as acrylates and methacrylates. And acrylonitrile, methacrylonitrile and other acrylic or methacrylic monomers, and copolymers with maleic anhydride and the like.

In the present invention, if necessary, an ultraviolet absorber may be added to the receptor layer 4. Addition of the ultraviolet absorber improves the weather resistance of the dye transferred from the thermal transfer sheet and dyed on the receptor layer. Examples of the ultraviolet absorber include a benzophenone type, a hindered amine type, and a benzotriazole type. The amount of addition is about 0.05 to 5 parts by weight based on 100 parts by weight of the resin constituting the receiving layer 4.

The receiving layer 4 may optionally contain a release agent for the purpose of improving the releasability from the thermal transfer sheet. Examples of the release agent include solid waxes such as polyethylene wax, amide wax, and Teflon powder, fluorine-based and phosphate-based surfactants, and silicone oil. Silicone oil is preferred. Oily silicone oils may be used, but curable silicone oils are preferred. Examples of the curable silicone oil include a reaction curable type, a photocurable type, and a catalyst curable type, and a reaction curable type silicone oil is particularly preferable. The reaction-curable silicone oil is preferably one obtained by reacting and curing an amino-modified silicone oil and an epoxy-modified silicone oil. The addition amount of these curable silicone oils is preferably 0.5 to 30 parts by weight based on 100 parts by weight of the resin constituting the acceptable amount 4. The release agent is not limited to the case where the release agent is added to the receiving layer 4. The release agent may be formed by dissolving or dispersing the release agent in an appropriate solvent on the surface of the receiving layer 4 and drying to form a release agent layer. Good. As the release agent constituting the release agent layer, the above-mentioned cured product of the amino-modified silicone oil and the epoxy-modified silicone oil is particularly preferable.
The release agent layer is preferably formed to a thickness of 0.01 to 5 µ, particularly 0.05 to 2 µ. The release agent layer may be provided on a part of the surface of the receiving layer 4 or on the entire surface. However, when the release agent layer is provided on a part of the surface of the receiving layer 4, the release agent layer is not provided. The part can be subjected to dot impact recording, heat-sensitive melting transfer recording, or recording with a pencil or the like.Sublimation transfer recording is performed to the part where the release agent layer is provided, and to the part where the release agent layer is not provided. The sublimation transfer recording method can be used in combination with another recording method, such as recording by another recording method.

A support sheet 6 that is provided on the surface of the transparent substrate 2 opposite to the side on which the receiving layer 4 is provided, through a pressure-sensitive adhesive layer 5 so as to be releasable.
Is provided to improve the paper passing property of the heat transfer sheet 1 in the transfer device. However, a detection mark for positioning in the transfer device at the time of transfer can be printed on the support sheet 6. . The support sheet 6 may be transparent or opaque, and its material is, for example, synthetic paper, cellulose fiber paper, synthetic resin sheet, or the like. Examples of the synthetic paper include a type obtained by inserting a filler into a polyolefin resin, extruding and stretching, and a type obtained by applying a mixture of a filler and a binder to a polyolefin, polystyrene, or polyester sheet. Cellulose fiber paper is impregnated with high quality paper, coated paper, art paper, cast coated paper, synthetic resin or rubber.
Coated or internally added processed paper, processed paper obtained by extrusion laminating polyethylene or the like can be used. As a synthetic resin sheet, a single transparent film such as polyethylene terephthalate, polypropylene, hard vinyl chloride, etc.
A sheet extruded by adding a filler such as calcium carbonate or titanium oxide, or a laminated paper obtained by extruding the above resin or a resin containing the filler onto a high-quality paper or the like, or a fine surface formed by sandblasting, embossing, etc. Those having irregularities are used.

By providing a slippery layer on the back surface of the support sheet 6, the paper passing property can be further improved. The lubricating layer can be formed by applying a methacrylate resin such as methyl methacrylate or a corresponding acrylate resin, or a vinyl resin such as vinyl chloride-vinyl acetate copolymer.

As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 5, a normal pressure-sensitive adhesive can be used, but a weak pressure-sensitive adhesive is preferable in order to facilitate the peeling of the support sheet 6. Examples of the weakly-adhesive pressure-sensitive adhesive include those obtained by kneading inorganic particles into a normal pressure-sensitive adhesive, a pressure-sensitive adhesive having low physical adhesion to the substrate 3, and a release agent mixed with a normal pressure-sensitive adhesive. Those having a moldability are exemplified. Specific examples of the pressure-sensitive adhesive include polyacrylates, acrylic copolymers, natural rubbers, synthetic rubbers, petroleum resins, and block copolymers such as SIS and SBR. If necessary, an adhesive reinforcing agent, a plasticizer, a filler, and the like may be added to the adhesive.

When the pressure-sensitive adhesive layer 5 is made of a weakly-adhesive pressure-sensitive adhesive, the pressure-sensitive adhesive layer 5 may be provided on the entire back surface of the base material 2. In particular, when the pressure-sensitive adhesive layer 5 is made of a normal pressure-sensitive adhesive, it is preferable to partially provide the pressure-sensitive adhesive layer 5 in order to easily peel off the support sheet 6. When the pressure-sensitive adhesive layer 5 is partially provided, the pressure-sensitive adhesive layer 5 is provided in various patterns in consideration of the balance with the portion where the pressure-sensitive adhesive layer is not provided. FIGS. 2A to 2C show examples of pattern formation of the pressure-sensitive adhesive layer 4. The adhesive layer 5 has an adhesive of 0.1 to 10
It is formed by coating to a thickness of about μ, but the coating thickness is not necessarily required to be constant, and the coating thickness is changed continuously or discontinuously as shown in FIGS. Is also good.
When the thickness of the pressure-sensitive adhesive layer 5 is changed in this manner, even if the support sheet 6 shrinks during printing, the entire heat transfer sheet 1 is unlikely to curl. 2 can hardly occur.

The heat transfer sheet 1 of the present invention may be provided with a half-cut treatment (support sheet) as shown in FIGS. A cut is made in a part other than 6 or the support sheet 6. In the figure, 7 shows a place where a cut is made.
In the case of FIG. 4 (f), a cut is made only in the support sheet 6. ) Can also be applied.

In order to perform the transfer to the heat transfer sheet 1 of the present invention, the heat transfer sheet 8 is overlapped with the heat transfer sheet 8 so that the receiving layer 4 is in contact with the heat transfer layer 9 of the heat transfer sheet 8 as shown in FIG.
Is heated by the thermal head 11 or the like from the side of the base material 10.
Thereafter, by peeling off the thermal transfer sheet 8, the dye or the like of the thermal transfer layer 9 at a location heated by the thermal head 11 or the like is transferred to the receiving layer 4, and desired information 12 is transferred and recorded on the thermal transfer sheet 1.

Examples of the material of the substrate 10 in the thermal transfer sheet 8 include a capacitor paper, a polyester film, a polyethylene naphthalate film, a polystyrene film, a polysulfone film, a polyimide film, a polyvinyl alcohol film, a cellophane, and a plastic film such as an aramid (aromatic polyamide) film. It is used, and the thickness is preferably 2 to 50 μm, particularly preferably 2 to 12 μm. These films are preferable because of their smooth surface and high mechanical strength. Among them, it is preferable to use polyester films and aramid films. The surface of the base material 10 on the side in contact with the thermal head is preferably subjected to a treatment for preventing fusion with the head.

The thermal transfer layer 9 is composed of a dye and a binder which migrate by melting or sublimation by heating. The dye is preferably a sublimable disperse dye, a sublimable oil-soluble dye or a sublimable basic dye, and has a molecular weight of 150 to 800, particularly 350 to 700.
Are preferred. These dyes are selected in consideration of the sublimation temperature, hue, weather resistance, solubility in ink or binder resin, and the like, and examples thereof include the following.

CI (short for color index; the same applies hereinafter) yellow 51, 3, 54, 79, 60, 23, 7, 141, etc.

CI Disperse Blue 24, 56, 14, 301, 3
34, 165, 19, 72, 87, 287, 154, 26
etc.

CI Disperse Red 135, Same 146, Same 59, Same 1, Same
73, 60, 167 etc.

CI Disperse Violet 4, 13, 36, 5
6, 31 mag.

C.I. Solvent Baoilet 13.

C.I. Solvent Black 3.

C.I. Solvent Green 3

C.I.Solvent Yellow 56, 14, 14, 16, 29 etc.

CI Solvent Blue 70, 35, 63, 36, 50
Same 49, same 111, same 105, same 97, same 11 etc.

CI Solvent Red 135, 81, 18, 18, 25, 1
9, 23, 24, 143, 146, 182 etc.

Examples of the binder in the thermal transfer layer 9 include ethyl cellulose, hydroxyethyl cellulose, ethyl hydroxyethyl cellulose, hydroxypropyl cellulose,
Cellulose resins such as methylcellulose, cellulose acetate, and cellulose acetate butyrate, and vinyl resins such as polyvinyl alcohol, polyvinyl butyral, polyvinyl pyrrolidone, polyester, polyvinyl acetate, and polyacrylamide can be used.

The ratio of the dye and the binder in the thermal transfer layer 9 is preferably such that the value of the dye / binder is 0.3 to 3.0, particularly 0.55 to 2.6 by weight. If it is less than 0.3, the print density and thermal sensitivity are insufficient, and if it exceeds 3.0, the retention of the dye in the binder is insufficient, and the preservability of the thermal transfer sheet 8 decreases. Further, the dye is preferably dissolved in the binder, and when the dye is dispersed in the binder as in the conventional sublimation transfer paper for fabric, in order to sublimate the dye, the interaction between the dye molecules and the dye are required. It is necessary to provide energy that overcomes the interaction between the molecule and the binder, which necessarily requires high energy, resulting in reduced thermal sensitivity.

Hereinafter, the present invention will be described in more detail with reference to specific examples. Incidentally, all the formulations in the examples are parts by weight.

Examples 1 to 12 and Comparative Examples 1 to 4 The sheets shown in Table 1 were used as a substrate, and the ink composition for forming a transparent resin layer having the following composition was applied on the sheet as required, and the coated amount at the time of drying was 10 g / m ^2. The transparent resin layer was formed by coating and drying so as to obtain (Table 1 shows whether or not the transparent resin layer was formed).

Ink composition for forming transparent resin layer ・ Polyurethane resin (Takelac A-712B: manufactured by Takeda Yakuhin) 30 parts ・ Isocyanate curing agent (Takenate A-72B: manufactured by Takeda Yakuhin) 18 parts ・ Ethyl acetate 52 parts On the provided (on a transparent substrate when a transparent resin layer is not provided), the following ink composition for forming a transparent receiving layer is coated and dried so that the coating amount at the time of drying is 3 g / m ^2. A transparent receiving layer was formed.

Ink composition for forming a transparent receiving layer ・ Polyester (Vylon 200: Toyobo) 70 parts ・ Polyester (Vylon 290: Toyobo) 30 parts ・ Amino-modified silicone (KF-393: Shin-Etsu Chemical) 5 parts ・ Epoxy-modified silicone ( X-22-343: Shin-Etsu Chemical Co., Ltd.) 5 parts ・ Methyl ethyl ketone 350 parts ・ Toluene 350 parts After providing this transparent receiving layer, a weak adhesive is applied to the surface of the transparent substrate opposite to the side where the transparent receiving layer is provided. (Sekisui Dine: Esdine AE-398) is applied in each of the patterns shown in FIGS. 2 (A) to 2 (K) to form a partial pressure-sensitive adhesive layer. A 38 μ polyester film (Lumirror E-20, manufactured by Toray Industries, Inc.) was dry-laminated to obtain a heat-transferable sheet for preparing a transmission type original.

On the other hand, a polyester film having a thickness of 4.5 μm provided with a heat-resistant lubricating layer made of a thermosetting acrylic resin on one surface (manufactured by Toray:
And a heat transfer layer forming ink composition having the following composition applied to the surface opposite to the side provided with the heat-resistant lubricating layer so that the coated amount after drying is 1 g / m ^2. Thus, a thermal transfer layer was formed to obtain a thermal transfer sheet.

Cyan ink composition for thermal transfer layer formation ・ Disperse dye (Kayaset Blue 714: Nippon Kayaku) 5 parts ・ Polyvinyl butyral (Eslec BX-1: Sekisui Chemical) 4 parts ・ Methyl ethyl ketone 46 parts ・ Toluene 45 parts Thermal transfer layer formation Magenta ink composition for use ・ Disperse dye (MS Red G: manufactured by Mitsui Toatsu Chemicals) (Disperse Red) 2.6 parts ・ Disperse dye (Macrolex Violet R: manufactured by Bayer) (Disperse Violet 26) 1.4 parts ・ Polyvinyl butyral (Eslec BX) 4.3 parts ・ Methyl ethyl ketone 45 parts ・ Toluene 45 parts Yellow ink composition for thermal transfer layer formation ・ Disperse dye (Macrolex Yellow 6G: manufactured by Bayer) (Disperse Yellow 201) 5.5 parts ・ Polyvinyl butyral (Eslek BX) 4.5: ・ Methyl ethyl ketone 45 parts ・ Toluene 45 parts Above thermal transfer sheet and permeation Using the thermal transfer-receiving sheet for creating a document, examined color shift performed transcription under the following conditions, the presence or absence of curling, the transfer density. The results are shown in Table 1.

Transfer conditions Transfer speed: 33.3 msec / line Pulse width: 16 msec Feed pitch: 0.166 mm Head voltage: 11.0 V [Effects of the Invention] As described above, the heat-transfer sheet for preparing a transmission-type original of the present invention heats a thermoplastic resin sheet as a transparent base material at a softening temperature or higher in a non-tension state, and heats the sheet at a softening temperature or higher. Since a sheet made of a sheet having a heat shrinkage of 2 to -1% when heated to a temperature is used, there is no risk of curling of the sheet to be transferred due to heat at the time of transfer by a thermal head. No translucent manuscript can be created. Further, by providing a cushioning transparent resin layer between the transparent base material and the receiving layer, the transfer of the heat transfer sheet in the transfer device becomes smooth and a transfer image with high density can be obtained. Further, if the support sheet is provided on the back side of the transparent substrate so as to be releasable, the heat transfer sheet in the transfer device is improved in paper passing property, and the support sheet is adhered with a weakly tacky adhesive. By partially providing the adhesive layer, the support sheet can be easily peeled off, and the pressure-sensitive adhesive layer can be supported by changing the applied amount of the adhesive continuously or discontinuously. Even if the body sheet shrinks during printing, there is an effect that almost no curl of the substrate occurs when the support sheet is peeled off after printing.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a heat-transfer sheet for producing a transmission type original according to the present invention, and FIG. 2 is an example of various patterns when a pressure-sensitive adhesive layer is partially formed. FIG. 3 is an explanatory view showing various examples in which the coating amount of the pressure-sensitive adhesive layer is changed continuously or discontinuously, and FIG. 4 is an explanatory view showing various examples of a half-cut forming pattern. Figure, fifth
The figure is a longitudinal sectional view showing a state in which transfer is performed on a heat transfer sheet of the present invention using a heat transfer sheet. DESCRIPTION OF SYMBOLS 1 ... Transfer type heat transfer sheet for producing originals 2 ... Transparent base material 3 ... Transparent resin layer 4 ... Transparent receiving layer 5
... adhesive layer, 6 ... support sheet

Claims (6)

(57) [Claims] 1. A transparent base material, wherein a thermoplastic resin sheet is heated to a softening temperature or lower in a non-tension state and a heat shrinkage is 2 to -1% when the sheet is heated to a temperature higher than the softening temperature. And a transparent receiving layer provided on one surface of the base material and receiving a dye transferred from the thermal transfer sheet by heating. 2. The heat-transferable sheet according to claim 1, wherein a cushioning transparent resin layer is provided between the transparent substrate and the transparent receiving layer. 3. The transparent base material according to claim 1, wherein a support sheet is releasably provided on the surface opposite to the surface on which the receiving layer is provided via an adhesive layer. Heat transfer sheet for making transmissive originals. 4. The heat-transferable sheet according to claim 3, wherein the pressure-sensitive adhesive layer is made of a low-pressure-sensitive adhesive. 5. The heat-transferable sheet according to claim 3, wherein the pressure-sensitive adhesive layer is partially provided. 6. The transmission type original production cover according to claim 3, wherein the pressure-sensitive adhesive layer is provided by continuously or discontinuously changing an application amount of the pressure-sensitive adhesive. Thermal transfer sheet.