JPH1184709A - Transfer sheet and transferred image forming method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable peeling in a short time by a wet transfer system and to ensure satisfactory bonding property to a body, to which an image is transferred, by successively laminating a peelable layer based on a water-soluble resin, a binder layer, which exhibits tackiness and/or adhesiveness when heated and an image retaining layer on a water permeable substrate. SOLUTION: A peelable layer based on a water-soluble resin, a binder layer which exhibits tackiness and/or adhesiveness when heated and an image retaining layer which forms an image are successively laminated on a water permeable substrate. The binder layer is based on a delayed tack tackifier, which exhibits tackiness when heated or a hot-melt adhesive which, exhibits adhesiveness when heated and the coating weight of the binder layer is preferably 0.1-30 g/m<2> on dry basis. The water-soluble resin is preferably based on PVA having <=90% saponification degree and a polymn. degree of <=1,000. The image retaining layer is based on vinyl acetate resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrophotographic copying machine having a process of electrostatically transferring a toner image onto a transfer material such as plain paper by a xerography system or a thermal transfer recording system.
Printer having a process of transferring hot-melt ink, sublimation dye, etc. to a material to be transferred, or a printer having a process of transferring aqueous ink or hot-melt ink to a material to be transferred by an ink-jet method (hereinafter abbreviated as a copying device) With respect to the transfer sheet used for, in more detail, the image on the transfer sheet formed by the copying apparatus, other substrates, such as cloth, canvas,
For base materials such as plastic, paper, wood, leather, glass, pottery, metal, etc., especially base materials such as plastic, wood, leather, glass, pottery, metal, etc., for which transfer painting by heating and pressing was difficult. The present invention relates to a transfer sheet used in a step of retransfer and an image forming method using the same.

[0002]

2. Description of the Related Art With the spread and development of copying apparatuses in recent years, attempts have been made to develop new applications not only by simply forming a copy image on plain paper but also by applying the functions thereof. I have. As one of such new uses, there is an example in which an image created by a copying machine is retransferred and fixed to another base material such as cloth, leather, canvas, plastic, wood, glass, pottery, and metal. . This type of use is useful for non-mass-producing individuals or small lots of goods, such as custom-made T-shirts, sweatshirts, aprons, jumpers, cups, plates, stained glass, panel reproductions, etc. In recent years, it has become possible to use a full-color copying machine capable of obtaining a high-quality image, so that a higher-quality image can be easily printed, and the demand is expanding.

As a transfer sheet for forming a transfer image by transferring a toner image to a transfer object, as disclosed in, for example, Japanese Patent Application Laid-Open No. 52-82509, a transfer sheet is used. In some cases, an undercoat layer made of a specific low-melting polymer is provided on an adhesive element made of an adhesive substance selected from the group consisting of silicon and a fluorinated polymer.
This means that when retransferring the image, the undercoat layer made of the low-melting polymer of the transfer sheet on which the image is formed is combined with a cloth, etc., and heated,
The undercoat layer softened by pressurization and the image are transferred integrally. In the present invention, such heating,
The method of performing transfer painting by applying pressure is hereinafter referred to as dry transfer.

On the other hand, a transfer layer is formed by sequentially laminating a release layer mainly composed of a water-soluble resin, an adhesive layer having an adhesive property on an object to be transferred, and an image holding layer on which an image is formed, on the surface of a water-permeable mount. A sheet has been proposed, and an example of such a transfer sheet is disclosed in, for example, JP-A-8-108610.

In such a transfer sheet, after the image is formed, the transfer sheet is immersed in water to dissolve the release layer, whereby the image holding layer / adhesive layer film can be peeled off from the backing sheet and slide-peeled off the backing sheet. The image holding layer / adhesive layer film is attached to a substrate such as glass or plastic and dried to form a transferred image. In the present invention, such a method of immersing in water for peel transfer is hereinafter referred to as wet transfer.

[0006] Wet transfer, compared to dry transfer sheet, heating,
No special equipment is required for pressure treatment, and it can be transferred to substrates that deform or break due to heating or pressing of glass, plastic, etc. without problems, and can be easily transferred to any curved surface shape. This is an excellent method.

However, Japanese Patent Application Laid-Open No. Hei 8-10861 discloses
In the transfer sheet disclosed in Japanese Patent Laid-Open Publication No. 0, after immersion in water, the image holding layer / adhesive layer film is slid off and temporarily placed on a transfer receiving body. Because it has the property, it will be partially adhered immediately and it is difficult to correct the position or if wrinkles are entered,
There is a drawback that it is extremely difficult to remove wrinkles.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in the wet transfer method, peeling can be performed in a short time and the image holding layer film is temporarily placed on the transfer object. It is another object of the present invention to provide a transfer sheet that can freely correct the position, can easily remove wrinkles even if the wrinkles are formed, and can secure sufficient binding property to a transfer target.

[0009]

Means for Solving the Problems As a result of intensive studies by the present inventors, the above problems have been solved by (1) "a release layer mainly composed of a water-soluble resin on a water-permeable support, Or, a transfer sheet in which a binder layer exhibiting adhesiveness and an image holding layer on which an image is formed are sequentially laminated. ", (2)" The dry adhesion amount of the binder layer is 0.1 g / m ² or more. The transfer sheet according to the item (1), wherein the binder sheet has a weight of 30 g / m ^2. ”, (3)“ The binder layer mainly contains a delayed tack adhesive which exhibits tackiness when heated. (4) The transfer sheet according to the above (1) or (2), wherein the binder layer mainly contains a hot melt adhesive which exhibits adhesiveness by heating. Transfer sheet according to the above (1) or (2). ", (5) Transfer sheet according to (3), characterized in that comprising as a main component acrylic acid ester copolymer ", - delayed tack adhesive styrene.
(6) The transfer sheet according to the above (4), wherein the hot melt adhesive mainly comprises a styrene-acrylate copolymer and / or a thermoplastic urethane resin. "The transfer sheet according to any one of the above items (1) to (6), wherein the water-soluble resin is mainly composed of polyvinyl alcohol having a saponification degree of 90% or less and a polymerization degree of 1000 or less. (8)
"The water-soluble resin has a saponification degree of 90% or less and a polymerization degree of 10
(1) to (6), wherein the main component is an itaconic acid-modified polyvinyl alcohol of 00 or less.
Item 6. The transfer sheet according to any one of the above items. And (9)
It has been found that the problem can be solved by "the transfer sheet according to any one of the above items (1) to (6), wherein the image holding layer comprises a vinyl acetate resin as a main component."

The above object is also achieved by (10) the transfer sheet according to any one of the above items (1) to (9), using an image forming method for forming a toner image on an image receptor by an electrophotographic method. (1) The image forming transfer sheet characterized in that an image is formed on the receiving paper by using an image forming method of transferring a hot melt ink layer or a heat sublimable dye onto a receiving paper by a thermal recording method. To (9), wherein an image is formed on the transfer sheet described in any one of (9) to (9). "

[0011] Further, the above-mentioned problem is solved by (12) "(1)
Item: An image is formed on the image holding layer of the transfer sheet according to any one of Items 9 to 9, and the image forming transfer sheet is immersed in water, and the image forming image holding layer / binder layer becomes peelable. A transfer image forming method, comprising: combining a binder layer and a transfer target with an integrated film on a transfer target; "
Is solved by

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the contents of the present invention will be described in more detail. That is, the transfer sheet of the present invention is immersed in water because the adhesive layer in the transfer sheet described in JP-A-8-108610 is a binder layer that exhibits tackiness and / or adhesiveness by heating. After that, even if the image holding layer / binder layer film is slid and peeled off and temporarily attached to the transfer receiving body, the binder layer which does not exhibit adhesiveness and / or adhesiveness unless heated is transferred to the transfer receiving body. Since they are in contact, the position can be easily corrected and wrinkles can be easily removed at the time of temporary attachment. After fixing the position and removing the wrinkles, drying and heat treatment, the binder layer in contact with the transferred body develops tackiness and / or adhesiveness, and the binding property to the transferred body is improved. Secured.

The binder layer of the transfer sheet according to the present invention comprises:
As described above, it has no tackiness and / or adhesiveness at around normal temperature, and is characterized by a function of expressing tackiness and / or adhesiveness only by heating, and is a delayed tack adhesive according to the present invention. Clearly, it is not limited to hot melt adhesives alone. A mixture of the delayed tack adhesive and the hot melt adhesive can also be suitably used as the binder layer of the transfer sheet in the present invention. The term "near normal temperature" as used in the present invention generally refers to a range of 5 to 40 ° C, and “heating” means to place the device in a temperature environment of approximately 40 ° C or higher.

The delayed tack pressure-sensitive adhesive referred to in the present invention has no tackiness at around room temperature, but develops tackiness upon heating and lasts semi-permanently even after cooling. Agent and polymer as main components.
This solid plasticizer has almost no plasticizing action near normal temperature, but melts and dissolves in the polymer at high temperatures, softens the polymer in the same manner as a normal plasticizer, and imparts tackiness.

The detailed composition and material names of these delayed tack adhesives are described in “Adhesion Handbook”, 12th edition (published by the Society of Polymer Publishing, 1980), and these can be used in the present invention. it can. That is, the adhesive contains a crystalline solid plasticizer. This plasticizer has almost no plasticizing action at normal temperature, but melts and dissolves in the polymer at high temperature, softens the polymer similarly to the ordinary plasticizer, and imparts tackiness. The simplest method is to mix the emulsion and the solid plasticizer and knead them with a ball mill. The composition was 100 parts of base polymer, 30 to 1
00 parts tackifier, 5-20 parts wax, 1
~ 2 parts antiaging agent, 0-20 parts filler, 0-70
It usually consists of parts of a plasticizer / oil and an appropriate amount of solvent. As the base polymer, those having a relatively low molecular weight and good temperature sensitivity, and those having a tackifier liquid or a melting point up to about 80 ° C. are preferable. In each case, select one with a molecular structure such as an ether bond, which has a large degree of freedom in the segment and is easy to move. It is preferable that the wax has poor compatibility with other components at room temperature, and is compatible with heating and has slow crystallization. That is, to achieve delayed tack, it is necessary to combine the compatibility of the components with the crystallinity and the continuity of the molecular motion in a well-balanced manner. As another method, there is a method in which a tackifier or a plasticizer is encapsulated in microcapsules, uniformly dispersed with other components, and the capsules are melted by heating to be compatible with each other to develop tack. Specific examples of the composition are, of course, not limited to the following, but are as follows. An example of composition Indene resin 45 parts by weight Ethyl cellulose 10 parts by weight Diphenyl phthalate 45 parts by weight Amine dispersant 6 parts by weight Water 169 parts by weight Polybutyl methacrylate emulsion (50% concentration) 10 parts by weight Among such delayed tack adhesives As the polymer, a polymer containing a styrene-acrylate copolymer as a main component is preferable because it is excellent in the strength of the adhesive strength and the durability of the adhesive strength.

The hot melt adhesive referred to in the present invention is a solid adhesive based on a thermoplastic polymer, which melts when heated and solidifies when cooled. The bonding is performed in a molten state of the resin, and the bonding is caused by cooling after bonding. This hot melt adhesive does not contain a solvent or water. A solid adhesive based on a thermoplastic high polymer that melts when heated and solidifies when cooled. Bonding is performed in a molten state of the resin, and bonding is caused by cooling after bonding. The hot melt adhesive referred to in the present invention includes a so-called adhesive material for dry lamination.

The components of hot melt adhesives include compositions based on natural polymers to new synthetic polymers, or mixtures thereof, and are of a very wide variety, but are generally It is composed of the above thermoplastic polymer, waxes, plasticizer, tackifier, antioxidant, heat stabilizer, filler and the like. Each of these compositions is described on pages 210 to 214 of Shin Kobunko Bunko 8 “Adhesion Encyclopedia (above)” (written by Ichiro Shibasaki), and these can be used in the present invention. That is, as a raw material polymer of this hot melt adhesive,
Ethyl cellulose, vinyl acetate resin and its derivatives,
Polyethylene, ethylene-vinyl acetate copolymer, butyl methacrylic resin, polystyrene and copolymer, polyisobutylene, hydrocarbon resin (petroleum resin), polypropylene, polyamide resin, polyester resin, ethylene terpolymer, phenoxy resin (plasticizing And polybutene, butyl rubber, β-pinene resin, epoxy resin, maleic acid resin, phenol resin, urea resin, polyvinyl ether, ester gum, dammer resin which are compatible with these. , A pinsol resin, a polyester resin, an acrylic resin, and the like, and a coumarone indene resin, a rosin and its derivatives, a mineral, a plant, a petroleum wax, an animal and plant glue, an alkyd resin which has been used since ancient times. , Terpene resin, Fe Resin, asphalt and coal tar pitch can also be used, and as other raw material polymers, natural rubber and gutta percha (trans-type polymer of isoprene), and as a synthetic product having a structure similar to natural rubber, Coral rubber (Firest
one Tire & Rubber), American Ball S
N (Goodrich), etc., and when elasticity is not required, synthetic isoprene can also be used.

As described above, the constituents of the hot melt adhesive in the present invention include a composition mainly composed of a natural polymer to a new synthetic polymer or a mixture thereof. It can contain waxes, plasticizers, tackifiers, antioxidants, heat stabilizers, fillers and the like.

Examples of the wax include petroleum wax (paraffin wax, etc.), animal and plant wax (wood wax, white wax, beeswax, carnauba wax, canderia wax, etc.) mineral wax (microcrystalline wax, etc.). , As a resin component or as a modifier to improve the viscosity and applicability of hot melt adhesives.

As the plasticizer, DBP, DOP, TC
In addition to ordinary plasticizers such as P, BBP, chlorinated paraffin, etc., for the purpose of accelerating the melting of the adhesive, improving the fluidity, wetting the surface of the adherend, and the low-temperature flexibility, impact resistance, and peeling resistance of the adhesive. (Higher polymer of isobutylene), sulfonamide resin, petroleum resin (Piccopal), β-pinene resin (Piccoplastics, Piccolate) for the purpose of improving the properties or tackiness
Etc. can be used.

Examples of the tackifier include butyral resin, polyisobutylene, acrylonitrile polymer, petroleum resin and the like. Further, as an antioxidant, dilauryl thiodipropionate, 2,6-di-t-butyl-p-cresol, p-octylphenol, sodium benzoate, calcium stearate and the like can be used. In addition, talc, clay,
Commonly used fillers such as calcium carbonate, barium carbonate, and parita (barium sulfate) can be used. However, for fillers having extremely different specific gravities, it is necessary to sufficiently consider the use conditions.

The dry adhesion amount of these binder layers is 0.1.
Is preferably ^{1g / m 2 ~30g / m 2} . 0.1
If it is less than g / m ² , the binding property is insufficient, and if it is more than 30 g / m ^2, it is uneconomical and the transferred image becomes thick and unnatural.

The release layer of the transfer sheet of the present invention is mainly composed of a water-soluble resin.
For example, dextrin, polyvinyl alcohol, gelatin, glue, casein, shellac, starch, protein, polyacrylamide, polyvinyl methyl ether, copolymer of methyl vinyl ether and maleic anhydride, polyvinyl pyrrolidone, acetyl cellulose, acetyl butyl Cellulose, carboxymethylcellulose,
Examples include methylcellulose, hydroxymethylcellulose, and sodium alginate.

Among them, polyvinyl alcohol, particularly polyvinyl alcohol having a saponification degree of 90% or less and a polymerization degree of 1000 or less is preferable, and a saponification degree of 9 is particularly preferable.
Since the itaconic acid-modified polyvinyl alcohol having a polymerization degree of 0% or less and a polymerization degree of 1000 or less dissolves in water at a high speed when immersed in water, the support and the image holding layer / binder layer film can be peeled off quickly. It is preferable in terms of excellent properties.

The dry coating weight of the release layer is 1 g / m ^{2 to} 50 g /
m ² is preferred. If it is 1 g / m ² or less, the support and the binder layer partially adhere to each other at the time of production, and peeling becomes difficult. If it is 50 g / m ² or more, the peeling layer material will be on the surface of the binder layer after peeling. A considerable amount remains and mixes with the binder layer at the time of heating, thereby deteriorating the binding performance.

The material of the image holding layer of the transfer sheet of the present invention is not soluble in water, has good adhesion and compatibility with image forming components (toner, ink, dye, etc.), and has good film forming and shape holding properties. The resin is not particularly limited as long as it has a certain resin, but examples thereof include the following resins. That is, cellulose acetate such as vinyl acetate, ethylene-vinyl acetate copolymer, polyurethane, polyamide, polyester, polyolefin, cellulose nitrate, cellulose nitrate, styrene resin or styrene copolymer such as polystyrene, poly α-methylstyrene, poly ( Acrylic resins such as methyl (meth) acrylate and poly (meth) ethyl acrylate; vinyl polymers such as vinyl chloride vinyl acetate copolymer and ethylene vinyl alcohol copolymer; rosin ester resins such as rosin and rosin-modified maleic resin And natural or synthetic rubbers such as polyisoprene rubber and styrene butadiene rubber, and various ionomers, as well as epoxy resins and phenol resins.

The polyurethane includes isocyanates,
Includes thermoplastic polyurethanes obtained by reaction with polyols whose molecular ends are hydroxyl groups. Isocyanates include, for example, tolylene diisocyanate,
Aromatic diisocyanates such as diphenylmethane-4,4'-diisocyanate; alicyclic diisocyanates such as isophorone diisocyanate; aliphatic diisocyanates such as trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate and dodecamethylene diisocyanate. The polyol includes a polyhydroxy compound such as an alkane polyol, a polyester polyol, and a polyether polyol. At least one of these polyhydroxy compounds is used. Examples of the alkane polyol include alkanediols such as 1,5-pentanediol, 1,8-octanediol, 1,10-decanediol, and 1,12-dodecanediol. Examples of the polyester polyol include an aliphatic polyester diol, for example, a polyester diol containing, as a constituent unit, any one of an aliphatic diol and an aliphatic dicarboxylic acid described below. The polyether polyol includes, for example, polyether diols such as diethylene glycol, triethylene glycol, polyethylene glycol, tripropylene glycol, polypropylene glycol, and an addition compound of bisphenol A and an alkylene oxide such as ethylene oxide. As the polyamide, for example, nylon 6, nylon 11, nylon 12, nylon 13, nylon 610,
Nylon 612, nylon 616, and the like, and copolymerized nylon (for example, nylon 6 /
12 etc.).

The polyester includes a polyester containing any one of an aliphatic diol and an aliphatic dicarboxylic acid as a constituent unit, and particularly an aliphatic polyester containing an aliphatic diol and an aliphatic dicarboxylic acid as constituent components. Preferred polyesters often contain units of saturated aliphatic carboxylic acids. Aliphatic diol components include:
For example, ethylene glycol, diethylene glycol,
Triethylene glycol, polyethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, polypropylene glycol, 1,
It includes 3-butanediol, 1,4-butanediol, neopentyl glycol, 1,6-hexanediol, polymethylene glycol, and the like. Examples of the aliphatic dicarboxylic acid component include unsaturated acids such as maleic acid and fumaric acid. Saturated aliphatic dicarboxylic acids such as aliphatic dicarboxylic acid, succinic anhydride, adipic acid, azelaic acid, sebacic acid, suberic acid and dodecane diacid are exemplified. Examples of the polyolefin include polyethylene such as low-density polyethylene and linear low-density polyethylene, ethylene-butene-1 copolymer, and ethylene- (4-methylpentene-
1) Copolymer, ethylene-vinyl acetate copolymer, ethylene- (methane) acrylic acid copolymer, ethylene- (meth) -acrylate copolymer, propylene-butene-1
Copolymer, ethylene-propylene copolymer, ethylene-
Modified polyolefins such as propylene-butene-1 copolymer and anhydrous maleic are exemplified. Preferred polyolefins include modified polyolefins and the like. Among these resins, vinyl acetate resin is preferable because it is excellent in the balance between the adhesion to the image forming components (toner, ink, dye, etc.), compatibility and film shape retention.

The image holding layer may contain a tackifier, an antioxidant, an ultraviolet absorber, a coloring agent, an antistatic agent, if necessary.
It may contain a flame retardant, wax, plasticizer, filler and the like. 5 g / m ^2-
100 g / m ² is preferred. At 5 g / m ² or less, the film strength is low, and at 100 g / m ² or more, the transferred image becomes thick and unnatural. The water-permeable support of the present invention is not particularly limited as long as it has a material and structure that allows water to quickly permeate when immersed in water, and may be paper, synthetic paper, cloth, nonwoven fabric, leather, or polyethylene terephthalate. , Diacetate cellulose, triacetate cellulose, acrylic polymer,
Examples include cellophane, celluloid, polyvinyl chloride, polycarbonate, polyimide, polyethersulfone, polyethyletherketone, polyethylene, polypropylene, and other resin sheets, metal plates, metal foils, and the like. Further, a composite sheet produced by appropriately combining these materials, or a sheet having water resistance or conductivity imparted thereto by coating or lamination can be used, and is not particularly limited. Preferably, a paper weighing 20 to 200 g / m ² is used in terms of economy, transport stability in a copying apparatus, and water permeability.

To form a release layer, a binder layer, and an image holding layer, a coating solution prepared by dissolving, dispersing, or emulsifying materials for forming each layer in water or a suitable solvent is applied to a roll coater. It is formed by coating on a support using a coater such as a blade coater, a wire bar coater, an air knife coater, and a rod coater as appropriate. Alternatively, it may be formed by laminating on a support using a hot melt coater, a laminate coater or the like.

In order to form an image on the transfer sheet of the present invention, in addition to the above-described electrophotographic recording, thermal transfer recording, thermal transfer recording using a heat sublimable dye, and ink jet recording, Various printing methods such as printing, letterpress printing, intaglio printing, and stencil printing, as well as recording methods such as electrostatic recording, dot impact recording, and handwriting can be appropriately selected and applied.

[0032]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. The “parts” shown below are based on weight. Example 1 A non-sized high-quality paper weighing 104 g / m ² was used as a water-permeable support, and a coating (A) for a release layer having the following composition was applied to one surface of the support with a wire bar, dried, and dried. A dry coating amount of 11 g / m ² ) was obtained. <Coating for release layer (A)> Itaconic acid-modified polyvinyl alcohol 20 parts (KL-506, manufactured by Kuraray Co., Ltd., saponification degree 74.0 to 80.0%, polymerization degree 600) Water 80 parts Peeling obtained above On the layer, a binder layer coating material (A) having the following composition was applied with a wire bar and dried to form a binder layer (dry applied amount 2 g / m ² ).

<Coating Agent for Binder Layer (A)> Delayed tack-type pressure-sensitive adhesive emulsion 10 parts (PSA DT-1000, manufactured by Showa Polymer Co., Ltd., styrene-acrylate copolymer main component, solid content: 50 to 54) %) Water 40 parts On the binder layer obtained above, the following image holding layer paint (A) was applied with a wire bar and dried to form an image holding layer (dry coating amount: 30 g / m ² ). The transfer sheet (a) of the present invention was obtained.

<Coating (A) for Image Retaining Layer> A transfer sheet (a) obtained from a vinyl acetate emulsion (SH-502, manufactured by Showa Polymer Co., Ltd., solid content: 50%) was transferred to a color copying machine (manufactured by Ricoh Co., Ltd.). Pretail 550) was used to form a full color image on the image bearing layer. The image formed on the image holding layer was clear and had high image quality, and no difference from the image formed on plain paper for exclusive use of Pretail 550 was observed.

Next, the transfer sheet (a) on which a full-color image has been formed is immersed in water at 20 ° C. for 1 minute and then peeled off. Paper fibers did not adhere to the adhesive layer. Further, the peeled image-holding layer / binder layer film obtained above was placed on the glass plate so that the binder layer was in close contact with the glass plate (temporary adhesion), and after drying with a spatula, moisture was dried at room temperature. . At the time of temporary attachment, the image holding layer / binder layer film could be easily moved on the glass plate, and the position could be corrected and wrinkles could be easily removed. Further, the dried image holding layer /
Although the binder layer film and the glass plate were not bound, they were attached to such an extent that they could not be separated unless they were to be separated, and were in a temporarily attached state. Next, the glass plate to which the image holding layer / binder layer film thus obtained was temporarily attached was heated in an oven at 110 ° C. for 10 minutes, taken out of the oven after heating, and gradually cooled to room temperature. After slow cooling, the image-holding layer was firmly bound to the glass plate, and did not come off even if it was peeled off.

Example 2 The transfer of the present invention was carried out in the same manner as in Example 1 except that the following paint (B) for binder layer was used in place of the paint (A) for binder layer in Example 1. Sheet (b) was obtained. <Coating material for binder layer (B)> Hot melt adhesive emulsion 10 parts (PSA SE-9500, manufactured by Showa Polymer Co., Ltd., styrene-acrylate copolymer main component, solid content: 45-49%) Water 40 Department

An image was formed on the transfer sheet (b) obtained above in the same manner as in Example 1, and after immersing in water for 1 minute, the image-retaining layer / binder layer film which was easily peeled off was changed to a binder layer. It was placed so as to be in close contact with a glass plate, and after drying with a spatula, moisture was dried at room temperature. At the time of temporary attachment, correction of the position and removal of wrinkles could be performed easily as in Example 1. Next, the glass plate to which the image holding layer / binder layer film thus obtained was temporarily attached was heated in an oven at 100 ° C. for 5 minutes, taken out of the oven after heating, and gradually cooled to room temperature. After slow cooling, the image-holding layer was firmly bound to the glass plate, and did not come off even if it was peeled off.

Example 3 The following binder layer coating material (C) was used in place of the binder layer coating material (A) of Example 1 to form a full-color image on the image holding layer. A transfer sheet (c) of the present invention was obtained in the same manner as in Example 1 except that a sublimation transfer ribbon manufactured by Kodak Co., Ltd. was used instead of using a machine, and an image was formed using a Ricoh prototype sublimation transfer printer. <Coating material for binder layer (C)> Hot melt adhesive solution (Takelac T3500A, manufactured by Takeda Pharmaceutical Co., Ltd., thermoplastic urethane resin main component, solid content 24.5%)

An image was formed on the transfer sheet (c) obtained above in the same manner as in Example 1. After immersion in water for 1 minute, the image-retaining layer / binder layer film which was easily peeled off was changed to a binder layer. It was placed so as to be in close contact with a glass plate, and after drying with a spatula, moisture was dried at room temperature. At the time of temporary attachment, correction of the position and removal of wrinkles could be performed easily as in Example 1. Next, the glass plate on which the image holding layer / binder layer film thus obtained was temporarily attached was heated in an oven at 120 ° C. for 5 minutes, taken out of the oven after heating, and gradually cooled to room temperature. After slow cooling, the image-holding layer was firmly bound to the glass plate, and did not come off even if it was peeled off.

Comparative Example 1 The transfer sheet of the present invention was prepared in the same manner as in Example 1 except that the following paint (A) for the adhesive layer was used instead of the paint (A) for the binder layer in Example 1. (D) was obtained. <Coating material for binder layer (A)> Acrylic ester-based copolymer resin emulsion 10 parts (SE-4100, manufactured by Showa Polymer Co., Ltd., solid content 62%) Water 40 parts

An image was formed on the transfer sheet (d) obtained above in the same manner as in Example 1. After immersion in water for 1 minute, the image-retaining layer / adhesive layer film which was easily peeled off was replaced with a glass plate having an adhesive layer. However, at the time of this temporary attachment, the adhesive layer stuck to the glass plate, and it was impossible or very difficult to correct the position and remove wrinkles.

Comparative Example 2 A transfer sheet (e) was obtained in the same manner as in Example 1 except that the following coating material for release layer (B) was used instead of the coating material for release layer (A) of Example 1. . <Coating for release layer (B)> Polyvinyl alcohol 20 parts (PVA-105, manufactured by Kuraray Co., Ltd., saponification degree 98.0 to 99.0%, polymerization degree 500) Water 80 parts

Comparative Example 3 A transfer sheet (f) was obtained in the same manner as in Example 1 except that the following paint (C) for release layer was used instead of the paint (A) for release layer in Example 1. . <Coating for release layer (C)> Polyvinyl alcohol 10 parts (PVA-217, manufactured by Kuraray Co., Ltd., saponification degree 87.0 to 89.0%, polymerization degree 1700) Water 90 parts Transfer sheet obtained in Comparative Example 2 Using (e) and the transfer sheet (f) obtained in Comparative Example 3, an image was formed in the same manner as in Example 1, immersed in water for 1 minute, taken out of the water, and removed from the support. An attempt was made to peel off the agent layer film, but the peeling was heavy and did not easily peel off, but the peeling was barely possible. The peeled image holding layer / binder layer film was placed on the glass plate so that the binder layer was in close contact with the glass plate, and was dried with a spatula at room temperature. At the time of temporary attachment, correction of the position and removal of wrinkles could be performed easily as in Examples 1 and 2. Next, the resultant was heated at 110 ° C. for 10 minutes in an oven to which the obtained image holding layer / binder layer film was temporarily attached, taken out of the oven after heating, and gradually cooled to room temperature. After slow cooling
The image holding layer was firmly bound to the glass plate, and did not come off even if it was to be peeled off. If it was forcibly peeled off, the image holding layer was broken.

[0044]

As is apparent from the detailed and specific description, according to the present invention, a transfer sheet having an image holding layer film for forming a clear and high-quality image can be obtained. The image holding layer film can be easily and quickly peeled off by a wet transfer method using ordinary water, and the position of the image holding layer film can be freely corrected even if the image holding layer film is temporarily placed on a transfer object. Even when wrinkles are formed, the wrinkles can be easily removed, there is no distortion of the image, and the image holding layer film exhibits an extremely excellent effect that sufficient binding property to the transfer object can be secured.

Claims (14)

[Claims] 1. A water-permeable support having thereon a release layer mainly composed of a water-soluble resin, a binder layer exhibiting tackiness and / or adhesiveness by heating, and an image holding layer on which an image is formed. Transfer sheet made. 2. The dry adhesion amount of the binder layer is 0.1 g / m ^2.
The transfer sheet according to claim 1, wherein the transfer sheet has a weight of 30 g / m ² . 3. The transfer sheet according to claim 1, wherein the binder layer mainly contains a delayed tack adhesive which exhibits tackiness when heated. 4. The transfer sheet according to claim 1, wherein the binder layer mainly contains a hot-melt adhesive that exhibits adhesiveness when heated. 5. The transfer sheet according to claim 3, wherein the delayed tack adhesive comprises a styrene-acrylate copolymer as a main component. 6. The transfer sheet according to claim 4, wherein the hot-melt adhesive mainly comprises a styrene-acrylate copolymer and / or a thermoplastic urethane resin. 7. The transfer sheet according to claim 1, wherein the water-soluble resin contains polyvinyl alcohol having a saponification degree of 90% or less and a polymerization degree of 1000 or less as a main component. 8. The method according to claim 1, wherein the water-soluble resin is composed mainly of itaconic acid-modified polyvinyl alcohol having a saponification degree of 90% or less and a polymerization degree of 1000 or less. Transfer sheet. 9. The image forming apparatus according to claim 1, wherein the image holding layer comprises a vinyl acetate resin as a main component.
4. The transfer sheet according to 1. 10. An image forming and transferring method, wherein an image is formed on the transfer sheet according to claim 1 by using an image forming method for forming a toner image on an image receptor by an electrophotographic method. Sheet. 11. An image formed on the transfer sheet according to any one of claims 1 to 9 by using an image forming method for transferring a hot melt ink layer or a heat sublimable dye onto a receiving paper by a thermal recording method. Characteristic image forming transfer sheet. 12. An image forming image forming layer on the image holding layer of the transfer sheet according to claim 1, wherein the image forming transfer sheet is immersed in water to be peelable. A transfer image forming method, wherein a binder layer-integrated film is attached to an object to be transferred, the binder layer and the object to be transferred are combined, temporarily attached, and heat-treated. 13. The transfer image forming method according to claim 12, wherein the image forming transfer sheet according to claim 10 is used. 14. The transfer image forming method according to claim 12, wherein the image forming transfer sheet according to claim 11 is used.