JP2002192841A - Thermal transfer receiving sheet and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermal transfer receiving sheet discharged without being fused to an ink ribbon even if the receiving sheet is turned inside out by mistake to be printed by a high speed high image quality printer and prevented from such a phenomenon that the dye of a printed surface is transferred to the back surface of other receiving sheet coming into contact with the printed surface even if the printed receiving sheets are preserved in a stacked state, and a method for manufacturing the same. SOLUTION: In the thermal transfer receiving sheet wherein a dye receiving layer is provided on the single surface of a sheetlike support and a back surface layer is provided on the other surface thereof, the back surface layer is formed by using at least an antistatic agent, an adhesive and an isocyanate group- containing polymer having a polysiloxane region. The method for manufacturing the thermal transfer receiving sheet is also disclosed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a thermal transfer receiving sheet (hereinafter simply referred to as a receiving sheet).
More specifically, the present invention, when printing using a thermal transfer printer, excellent back print suitability, no set-off,
The present invention relates to a receiving sheet capable of high-speed high-quality printing and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, a thermal printer, particularly a dye thermal transfer printer capable of printing a clear full-color image, has attracted attention. Dye thermal transfer printers superimpose a receiving layer containing a dye-dyeable resin on a receiving sheet on a dye ink ribbon, and apply heat from a thermal head or the like to apply a predetermined concentration of dye at a required concentration on the receiving layer onto the receiving layer. To form an image. The ink ribbon is made of a dye of three colors of yellow, magenta and cyan, or a dye of four colors with black added thereto. A full-color image is obtained by repeatedly transferring the dye of each color of the ink ribbon to the receiving sheet in order.

[0003] A receiving sheet necessary for transferring and forming an image by such a thermal transfer printer is provided with a receiving layer mainly composed of a dye-dyeing resin on a sheet-like support.
On the back surface, a back surface layer is provided for the purpose of improving running properties, preventing static electricity, improving slipperiness between receiving sheets, and suitability for back printing. The back print suitability refers to the ability of the receiving sheet to be ejected without fusing the ink ribbon and the back layer when the front and back of the receiving sheet are mistakenly mounted on a printer and image recording is carried out.

[0004] Recent dye thermal transfer printers are required to be able to obtain images of high quality and high storage stability by high-speed printing. As the dye for forming a high-sensitivity image and the resin for a high-sensitivity receiving layer of such a printer, a dye having a high transferability to the receiving layer and a receiving layer resin having a high dye-dyeing property are used, respectively. Images formed with such dyes and resins have high recording sensitivity, but have low image storage stability. This is because the dye in the receiving layer easily migrates after image formation. One of the reasons why the image storage stability is reduced is that the dye on the printing screen is transferred to the back surface of another receiving sheet in contact with the printing screen, which is usually called set-off.

[0005] Set-off has been conventionally studied. For example, in Japanese Patent Application Laid-Open No. 5-208564, the use of a silicone block copolymer, silicone oil, or the like as a release agent for the back surface layer allows the set-off. At the same time, it is shown that the back print suitability is also improved. However, when a high-speed and high-quality printer is used, set-off and back print suitability are not always sufficiently satisfied.

Further, Japanese Patent Application Laid-Open Nos. 8-192852, 8-197855, and 8-19785
In JP-A No. 6-180180 and the like, vinyl phenol resin, polyvinyl acetal resin, and a cross-linked reaction product of these polyfunctional isocyanate compounds are shown as binders for the back layer. A specific conductive inorganic pigment has been proposed as an agent. By using such a material for forming a back surface layer, set-off is improved, but in reality, the suitability for back printing is insufficient.

Therefore, when a high-speed, high-quality printer is used, when an image is recorded by mounting the receiving sheet on the front and back with the wrong side, the ink ribbon and the backside layer are not fused, and the backside printability is excellent and the backside printability is excellent. There is a long-felt need for a receiving sheet having a transferless backside layer.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a high-speed, high-quality printer, in which even if the receiving sheet is mounted upside down and printed, the receiving sheet is discharged without fusing with the ink ribbon, and An object of the present invention is to provide a receiving sheet in which the dye on the printing screen is prevented from migrating to the back surface of another receiving sheet in contact with the printed sheet even when the printed receiving sheets are stacked, and a method for producing the same.

[0009]

The thermal transfer receiving sheet of the present invention has a dye-receiving layer on one side of a sheet-like support and a backside layer on the other side, wherein the backside layer comprises at least an antistatic agent, an adhesive, And an isocyanate group-containing polymer having a polysiloxane moiety. In the thermal transfer receiving sheet of the present invention, the antistatic agent is preferably a conductive inorganic pigment. As a method for producing the thermal transfer receiving sheet of the present invention, an isocyanate group-containing polymer having a polysiloxane moiety obtained by reacting a polyisocyanate compound with at least one selected from alcohol-modified silicone and amino-modified silicone, A composition for forming a back layer containing an inhibitor and an adhesive is prepared, and the composition for forming a back layer is coated on a sheet-like support and dried to form a back layer.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In order to impart back printing suitability to a receiving sheet, the present inventors have set forth, among the release agents for the back layer,
In particular, as a result of intensive studies on silicone compounds,
It has been found that the object of the present invention can be achieved by using an isocyanate group-containing polymer having a polysiloxane moiety as a release agent.

Conventionally, when a silicone compound is used as a release agent in order to prevent fusion with an ink ribbon, a method of crosslinking and curing silicone after applying a cross-linking agent in combination with a coating solution for the backside layer is known. As is done, extra time is required to crosslink and cure the silicone. or,
If the amount of silicone in the backside layer is simply increased, problems such as poor adhesion between the support substrate and the backside layer and contamination caused by unreacted silicone occur. Further, simply increasing the amount of the cross-linking agent may not provide the effect. Furthermore, in the case of a polymer obtained by graft-polymerizing a siloxane group-containing polymer with another resin or a block polymer, the fusion with the ink ribbon is improved, but the dye-dyeing property is increased and set-off is easily caused. Become.

The isocyanate group-containing polymer having a polysiloxane moiety of the present invention can be obtained by reacting a silicone compound having active hydrogen with a polyisocyanate compound. By using it as a mold agent, it has become possible to obtain a receiving sheet having excellent back print suitability and set-off suitability. The reasons for the great effect are:
By using an isocyanate group-containing polymer having a polysiloxane moiety, it is conceivable that an unreacted silicone does not remain and a silicone layer having a strong three-dimensional structure is formed near the surface layer of the back layer.

[0013] The isocyanate group-containing polymer having a polysiloxane moiety used in the present invention contains at least one active isocyanate group and a polysiloxane moiety in its molecule. Although it depends on the purpose and conditions of use of the receiving sheet, it is usually preferably 3,000 to 15,000. The amount of the isocyanate group-containing polymer having a polysiloxane moiety is preferably 1 to 20% by weight, more preferably 5 to 10% by weight of the entire back layer forming material.

The method for preparing the isocyanate group-containing polymer having a polysiloxane moiety of the present invention is preferably obtained by reacting a polyisocyanate compound with an alcohol-modified silicone and / or an amino-modified silicone. Can be prepared by heating and mixing in a solvent. In each component used in the reaction, isocyanate groups, hydroxyl groups and / or
Alternatively, the equivalent ratio to the amino group is preferably about 1.5 to 10. Although the reaction conditions cannot be unconditionally described, in the case of alcohol-modified silicone, the temperature is 30 to 90 ° C., and 1 to 2 times.
It is performed for about 0 hours. In the case of amino-modified silicone, the reaction is carried out at a temperature of normal temperature to 50 ° C. for about 30 minutes to 10 hours.

In this case, the active isocyanate group of the isocyanate group-containing polymer having a polysiloxane moiety is derived from a polyisocyanate compound, and a urethane binding site is formed by a reaction between the polyisocyanate compound and the alcohol-modified silicone. A urea binding site is formed by the reaction between the compound and the amino-modified silicone. Furthermore, using other alcohol compounds, amino compounds, or water, etc., a urethane binding site,
It is also possible to introduce a urea binding site into the polymer.

As the polyisocyanate compound, those containing two or more, preferably three or four isocyanate groups in the molecule can be used. Specifically, as polyfunctional polyisocyanate compounds, 2,4-tolylene diisocyanate (2,4-TDI), 2,6-TD
I, diphenylmethane-4,4'-diisocyanate (M
DI), hydrogenated MDI, 1,5-naphthalene diisocyanate, triphenylmethane triisocyanate, xylylene diisocyanate (XDI), hydrogenated XDI, meta-xylylene diisocyanate (MXDI), 3,3 ′
Aromatic isocyanates such as -dimethyl-4,4'-diphenylylene diisocyanate (TODI), isophorone diisocyanate (IPDI), trimethylhexamethylene diisocyanate (TMDI), hexamethylene diisocyanate (HDI), dimethyl diisocyanate (DDI), etc. Adducts, biurets, isocyanurates, or adducts of these polyisocyanates with polyhydric alcohols such as trimethylolpropane are preferably used. The molecular weight of the polyfunctional polyisocyanate compound is
Generally, about 500 to 1,000 is preferable.

As the alcohol-modified silicone, a silicone having a hydroxyl group introduced at both ends or one end of the silicone can be used. For example, X-22-161AS, KF-60 manufactured by Shin-Etsu Chemical Co., Ltd.
01, KF-6002, KF-60003 (both terminal OH groups), and XF3 manufactured by Toshiba Silicone Co., Ltd.
968 (one terminal OH group) or the like can be used.

Further, as the amino-modified silicone, a silicone having an amino group introduced at both terminals or one terminal of the silicone can be used. For example, X-22-161A and X-22-161 manufactured by Shin-Etsu Chemical Co., Ltd.
B, X-22-161C (both terminal amino groups), KF393, K-859, KF860, K861,
KF-867 (one terminal amino group) and the like can be used. The molecular weight of these silicones is preferably from 1,000 to 6,000, more preferably from 2,000 to
3,000. Further, as other amino compounds,
A low-molecular compound having one or more amino groups in the molecule can be preferably used, and for example, cyclohexylamine, hexamethylenediamine and the like can be used.

An antistatic agent such as a conductive polymer or a conductive inorganic pigment is added to the back surface layer of the present invention in order to improve print transportability and prevent static electricity. Examples of the conductive polymer include a conductive polymer such as a cationic polymer, an anionic polymer, and a nonionic polymer. In general, a cationic polymer is used. As the cationic polymer, for example, polyethyleneimine, an acrylic polymer containing a cationic monomer,
Examples include a cation-modified acrylamide polymer and a cationic starch. In general, the amount of the antistatic agent used is preferably about 10 to 50% by weight of the entire back layer forming material.

Examples of the conductive inorganic pigment include, for example, those disclosed in
No. 0-67180, and examples thereof include compound semiconductor pigments such as oxides and sulfides, and inorganic pigments coated with compound semiconductors. Examples of the compound semiconductor include copper (I) oxide, zinc oxide, zinc sulfide, and silicon carbide. Examples of the inorganic pigment coated with a compound semiconductor include titanium oxide and potassium titanate coated with a semiconductor tin oxide. For example, spherical ET-500W manufactured by Ishihara Sangyo Co., Ltd. Industrial FT-1000, FT-2000, FT-30
00 and the like. The size of the acicular conductive inorganic pigment generally has a fiber length of 1 to 20 μm and a fiber diameter of 0.1 to
It is about 2 μm.

Among the above antistatic agents, it is preferable to use a conductive inorganic pigment. Compared with a conductive polymer, the conductive inorganic pigment has low dye-dyeing property and hardly causes set-off.
In particular, needle-like conductive inorganic pigments are preferably used, and it is possible to obtain a low surface electric resistance with a small amount of addition, probably because the number of contact points is larger than that of spherical ones. When used in combination with a group-containing polymer, an extremely excellent effect can be obtained not only in suitability for set-off but also in adhesiveness on the back surface.

For the back layer of the present invention, a resin effective as an adhesive is used. This resin is also effective for improving the adhesive strength of the back surface layer to the base material, the print transportability of the receiving sheet, and preventing the receiving layer surface from being damaged. Such resins include acrylic resins, epoxy resins, polyester resins, phenolic resins, alkyd resins, urethane resins,
Melamine resins, polyvinyl acetal resins, and the like, and reaction cured products of these resins can be used. From the viewpoint of set-off, a polyvinyl acetal resin is generally preferable, and examples thereof include polyvinyl formal, polyvinyl acetal, polyvinyl butyral, and polyvinyl phenyl acetal.

In the back layer of the present invention, a friction coefficient modifier such as an organic or inorganic filler can be blended as required. Nylon powder, cellulose powder, urea resin powder, and the like can be used as the organic filler. As the inorganic filler, silica powder, barium sulfate powder and the like can be used. For example, in the case of nylon powder, the average particle size is 1 to
It is preferably about 30 μm, and its use amount is about 1 to 40% by weight of the entire back surface layer forming material, depending on the particle diameter.
30% by weight is preferred.

For the purpose of improving the adhesion between the antistatic agent, the adhesive or the coefficient of friction, etc. and the sheet-like support, etc., the above-mentioned polyisocyanate compound or epoxy compound may be appropriately used. Of course, it is also possible to use it by adding it to the paint for the back layer, and it is generally preferable to use about 1 to 10% by weight of the total material for forming the back layer.

In the back layer, a conventionally known release agent can be used in combination as long as the effects of the present invention are not impaired. For example, silicone compounds, fluorine compounds, phosphoric acid ester compounds, fatty acid ester compounds and the like as disclosed in JP-A-5-208564 are disclosed. Examples of the silicone compound include a silicone block copolymer, silicone oil, and silicone rubber.

The coating amount of the back layer is 0.3 to 10 g / m ^2.
Is desirably within the range. Preferably 1 to 5 g /
m ² . If it is less than 0.3 g / m ² , the receiving layer may not be sufficiently prevented from being damaged when the receiving sheet is rubbed. In addition, a coating film defect may occur and the surface electric resistance value may increase. If it exceeds 10 g / m ² , the effect is saturated and uneconomical. The receiving sheet of the present invention has an image receiving layer for receiving a dye image of an ink ribbon on one surface of a sheet-like support, and a back surface layer on the other surface.

The receiving layer of the present invention may contain, in addition to the dye-dyeing resin, a cross-linking agent, an anti-fusing agent, an ultraviolet absorber and the like. The receiving layer contains a dye-dyeable resin as a main component. Cellulose-based resins, polyester-based resins, polyvinyl acetal-based resins, vinyl chloride-based resins, polycarbonate-based resins, and the like are used as the resins having high dye-dyeing properties. In addition, an isocyanate, an epoxy, or the like is used as a crosslinking agent. The amount of the cross-linking agent used depends on its type, but is usually preferably about 2 to 25% by weight based on the dye-dyeable resin. Further, benzotriazole, benzophenone, phenyl salicylate, cyanoacrylate, and the like are used as an ultraviolet absorber, and an acrylic silicone resin, a lubricant, a release agent, and the like are used as an anti-fusion agent.

In the receiving sheet of the present invention, the thickness of the receiving layer is preferably from 1 to 10 μm, more preferably from 3 to 8 μm. When the thickness of the image receiving layer is less than 1 μm,
In some cases, inconveniences such as a decrease in the density and sensitivity of the thermal transfer dye image or a decrease in gloss of the printed surface may occur. On the other hand, when the thickness exceeds 10 μm, the effect of the image receiving layer is saturated, which is not only uneconomical, but also may lower the strength of the receiving layer. In general, the coating amount of the receiving layer is preferably about 3 to 10 g / m ² in terms of dry weight.

The sheet-like support used in the receiving sheet of the present invention may be a laminate of plastic sheets. In this case, the receiving sheet has a layered structure that can be deformed by heat when printed.
In the present invention, synthetic paper is a typical example of the plastic sheet used as the sheet-like support. Such a synthetic paper has a structure in which a biaxially stretched thermoplastic resin film is used as a base film, and a uniaxially stretched thermoplastic resin paper layer film is laminated on the surface thereof. The paper-like layer film contains filler particles, and has microvoids formed in the vicinity of the filler particles when stretched, so that the film has good writing properties and a feeling close to that of natural paper. Inorganic pigment used as a filler for the paper-like layer film, for example, clay, talc,
It is selected from gypsum, barium sulfate, diatomaceous earth, silicon oxide, and other white pigments, and is used alone or in combination.

In the present invention, the thermoplastic resin used for the synthetic paper for the sheet-like support is a polyolefin resin, for example, a homopolymer or copolymer such as ethylene, propylene or butene-1, a polyvinylidene resin, for example. It is selected from a homopolymer or copolymer of vinylidene chloride, a homopolymer or copolymer of styrene, a polyester resin, nylon and the like. These can be used alone or as a mixture. In addition, a stabilizer, a plasticizer, a filler, a pigment, and other auxiliary materials may be included in the thermoplastic resin as needed in an extendable range.

The base film of synthetic paper contains no fillers.
Preferably, it is contained at a ratio of 3% by weight. If the filling material is more than 3% by weight, the mechanical strength of the resulting receiving sheet may be insufficient. On the other hand, as the thermoplastic resin used for forming the paper-like layer film, the same or different as the resin for the base film can be selected from the above. Generally, the filler is 5 to 60 in the paper-like layer film.
% By weight.

As the sheet-like support used in the present invention, another sheet may be laminated on synthetic paper made of the above-mentioned stretched thermoplastic resin sheet. It is desirable to use a film having thermoplasticity and relatively high heat resistance, such as a polyethylene terephthalate film, for such a lamination sheet. As a film for lamination,
Various other synthetic resin films can also be used depending on the conditions of use. For example, polyvinyl chloride, polyvinylidene chloride, polyethylene, and polystyrene films can be used.

The sheet-like support used in the present invention comprises 2
It is desirable to have a thickness of 0 to 300 μm. When the thickness is less than 20 μm, the mechanical strength of the obtained receiving sheet is insufficient, and its hardness and repulsion against deformation are insufficient, so that the curling of the receiving sheet which occurs at the time of printing is sufficiently prevented. In some cases, it may not be possible. On the other hand, when the thickness exceeds 300 μm, the thickness of the obtained receiving sheet may be a problem. With a printer of a given volume, there is a limit to the receiving sheet storage volume,
An increase in the thickness of the receiving sheet naturally causes a decrease in the number of receiving sheets contained in the printer. In this case, in order to accommodate a predetermined number of receiving sheets, the volume of the printer must be increased, which makes it difficult to make the printer compact.

In the receiving sheet of the present invention, if necessary,
For example, the antistatic of the receiving layer, a cushioning material for increasing the image density, as an adhesive between the receiving layer and the film-like substrate,
An intermediate layer can be added between the film substrate and the receiving layer. The receiving layer and other coating layers of the receiving sheet of the present invention can be formed by coating and drying using a coater such as a bar coater, a gravure coater, a comma coater, a blade coater, an air knife coater, and a gate roll coater. it can.

[0035]

The present invention will be described in more detail with reference to the following examples, which, of course, are not intended to limit the scope of the present invention. In the examples, "parts" and "%" all indicate "parts by weight" and "% by weight". Example 1 Polyethylene terephthalate (PET) having a receiving layer forming thickness of 50 μm
A biaxially stretched, 60 μm-thick multilayer structure film (trade name: YUPO FPG60, Oji Oil Chemicals) containing a film as a core material, a polyolefin as a main component on its front and back surfaces, and about 30% of calcium carbonate or the like as an inorganic pigment. Paper)
A sheet-like support was produced by laminating and bonding with a urethane type adhesive by a dry lamination method. On the surface of this sheet-shaped support, a receiving layer coating was formed by applying a coating for a receiving layer having the following composition so that the coating amount of the solid content was 8 g / m ² , followed by drying to form a receiving layer.

[Coating Liquid for Receptive Layer] Polyester resin (trademark: Byron 200, manufactured by Toyobo Co., Ltd.) 100 parts Silicone oil (trademark: KF393, manufactured by Shin-Etsu Silicon Co., Ltd.) 3 parts Isocyanate (trademark: Takenate D-140N, Takeda Pharmaceutical Co., Ltd.) 5 parts Toluene 300 parts

Formation of Back Layer [Preparation of Isocyanate Group-Containing Polymer A Having Polysiloxane Site] Alcohol-modified silicone (trade name: S
F8427, manufactured by Dow Corning Toray Silicone Co., Ltd.) and isocyanate (trade name: Coronate L, manufactured by Nippon Polyurethane Co., Ltd.) so that the equivalent ratio (NCO / OH) of the isocyanate group to the hydroxyl group becomes 5, and toluene -A 20% solution of a mixed solvent of MEK (5: 1) was used.
The solution was reacted by stirring at 50 ° C. for 10 hours to obtain an isocyanate group-containing polymer A having a urethane binding site.

Next, the surface of the sheet-like support opposite to the surface on which the receptor layer is coated is coated using a coating solution for a back layer having the following composition so that the solid coating amount is 3 g / m ² . The back layer was formed by drying. Thereafter, curing was performed at 50 ° C. for 48 hours to obtain a receiving sheet. "Coating liquid for back layer" Polyvinyl butyral (trademark: BL-S, manufactured by Sekisui Chemical Co., Ltd.) 100 parts Needle-shaped conductive inorganic pigment (trademark: FT-3000, manufactured by Ishihara Sangyo Co., Ltd., average fiber length 5 μm, average fiber diameter) 0.3 part) 10 parts Dispersant (trademark: Tenlo 70, manufactured by San Nopco) 0.09 part Nylon filler (trademark: 2000EDX, manufactured by Elofachem Japan) 5 parts Polyisocyanate (trademark: D-110N, Takeda Pharmaceutical Co., Ltd.) 7 parts The above isocyanate group-containing polymer A 0.27 parts Toluene / MEK (1: 1) mixed solution 550 parts

Example 2 A receiving sheet was prepared in the same manner as in Example 1 except that the amount of the isocyanate group-containing polymer A was changed to 0.80 part in the coating solution for the back layer.

Example 3 [Preparation of Isocyanate Group-Containing Polymer B Having Polysiloxane Site] Amino-modified silicone (trade name: X-2)
2-161B, Shin-Etsu Chemical Co., Ltd.) and isocyanate (TM: NY-710A, Mitsubishi Chemical Corporation) and the equivalent ratio of an isocyanate group and an amino group (NCO / NH ₂₎ is 5
And a 20% solution of a mixed solvent of toluene and MEK (5: 1). This solution was reacted by stirring at 30 ° C. for 3 hours to obtain an isocyanate group-containing polymer B having a urea binding site. In the back layer coating liquid, instead of the isocyanate group-containing polymer A,
A receiving sheet was produced in the same manner as in Example 1 except that the isocyanate group-containing polymer B was used.

Example 4 In the back layer coating liquid, the isocyanate group-containing polymer B was used instead of the isocyanate group-containing polymer A.
A receiving sheet was produced in the same manner as in Example 2 except that was used.

Comparative Example 1 In the back layer coating liquid, alcohol-modified silicone (trade name: SF) was used instead of the isocyanate group-containing polymer A.
8427, manufactured by Dow Corning Toray Silicone Co., Ltd.), and a receiving sheet was produced in the same manner as in Example 1.

Comparative Example 2 In the back layer coating liquid, alcohol-modified silicone (trade name: SF) was used instead of the isocyanate group-containing polymer A.
8427, manufactured by Dow Corning Toray Silicone Co., Ltd.), and a receiving sheet was produced in the same manner as in Example 2.

Comparative Example 3 In the back layer coating liquid, amino-modified silicone (trade name: X-22) was used instead of the isocyanate group-containing polymer A.
-161B, manufactured by Shin-Etsu Chemical Co., Ltd.), and a receiving sheet was produced in the same manner as in Example 2.

Comparative Example 4 The same procedure as in Example 2 was carried out except that methylphenyl silicone oil (trade name: SH710, manufactured by Dow Corning Toray Silicone Co., Ltd.) was used in place of the isocyanate group-containing polymer A in the coating solution for the back layer. To produce a receiving sheet.

Comparative Example 5 In the back layer coating liquid, a fluorine-modified silicone (trade name: SF12) was used instead of the isocyanate group-containing polymer A.
65, manufactured by Dow Corning Toray Silicone Co., Ltd.), except that a receiving sheet was produced in the same manner as in Example 2.

Comparative Example 6 In the back layer coating solution, dimethyl silicone oil (trade name: SH) was used instead of the isocyanate group-containing polymer A.
200, manufactured by Dow Corning Toray Silicone Co., Ltd.), and a receiving sheet was produced in the same manner as in Example 2.

Comparative Example 7 In the back layer coating liquid, a silicone block copolymer (trade name: F) was used in place of the isocyanate group-containing polymer A.
A receiving sheet was produced in the same manner as in Example 1 except that 2.05 parts (S710, manufactured by NOF CORPORATION) was used.

Comparative Example 8 In the coating solution for the back layer, a silicone block copolymer (trade name: F) was used instead of the isocyanate group-containing polymer A.
(S710, manufactured by NOF CORPORATION)
A receiving sheet was produced in the same manner as in Example 1.

Evaluation Using the receiving sheets obtained in the above Examples and Comparative Examples, suitability for back printing, adhesion of the back layer to the substrate, and suitability for set-off were evaluated by the methods described below.

[Appropriate Back Print] Using a sublimation color video printer (trademark: UP5500, manufactured by Sony Corporation)
The front and back of the receiving sheet were attached in such a manner as to be printed on the back layer in the opposite manner as usual, and printed in a black solid pattern. The transportability and running performance of the receiving sheet at that time were determined according to the following evaluation criteria. Back print suitability evaluation standard ○: The paper is discharged without any problem in both the transportability and the traveling performance. Δ: The ink ribbon and the back layer are fused, but are discharged without any problem. X: The ink ribbon and the back layer are fused, and problems such as jamming and ribbon breakage occur in the printer.

[Adhesiveness of Back Layer] When a pressure-sensitive adhesive tape (trademark: Cellotape, manufactured by Nichiban Co., Ltd.) was manually applied to the back layer of the receiving sheet and then peeled off, the degree of peeling of the back layer was evaluated according to the following evaluation criteria. Judged. Adhesion evaluation criterion ：: No peeling of back surface layer occurs. Δ: The degree to which the back layer adheres to a part of the cellophane tape and peels off. ×: The back layer adheres to the entire surface of the cellophane tape and peels off.

[Appropriate transfer-off] Using a sublimation color video printer (trade name: UP5500, manufactured by Sony Corporation), the sheet was attached so as to be printed on the receiving layer surface of the receiving sheet, and printed in a black solid pattern. By overlaying the print samples, the printed receiving layer and the back layer are brought into contact,
Heating was performed at 60 ° C. for 24 hours while applying a pressure of 00 g / cm ² . After heating, the optical density of the back surface layer which was in contact with the printed receiving layer was measured using a Macbeth densitometer (trade name: RD-91).
4, Kollmorgen Corp.). In the determination of the set-off, the case where the optical density of the back surface layer was less than 0.10 was "O", and the case where the optical density was 0.10 or more was "X". The optical density of the back cover layer before the set-off test is 0.05 to 0.0
6.

[0054]

[Table 1]

As is clear from the results shown in Table 1, in each of the examples, the receiving sheet obtained by adding the isocyanate group-containing polymer having a polysiloxane moiety to the back layer coating solution was suitable for back printing suitability and supportability. It can be seen that it has excellent performance in all items such as the adhesion between the body and the back layer and the suitability for set-off. On the other hand, in each of the comparative examples, the polyisocyanate is used in a sufficient excess in the back layer coating solution, and even if a silicone compound is simply added to these coating solutions and used, the back printing suitability of the receiving sheet, A product satisfying both the back surface adhesiveness and the set-off suitability was not obtained.

[0056]

According to the present invention, when printing with a high-speed and high-quality printer, the receiving sheet is discharged without being fused with the ink ribbon and printed even if the receiving sheet is reversed. Even when the receiving sheets are stacked and stored, it is possible to obtain a receiving sheet in which the dye of the printing screen does not migrate to the back surface of another receiving sheet in contact with the printing screen, which greatly contributes to the industry. .

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Shigeo Hayashi 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Shinonome Research Center F-term (reference) 2H111 AA17 AA27 AA33 CA05 CA31 CA33 CA41

Claims (3)

[Claims] 1. A thermal transfer receiving sheet having a dye-receiving layer on one side and a backside layer on the other side of a sheet-like support, wherein the backside layer contains at least an antistatic agent, an adhesive, and an isocyanate group having a polysiloxane moiety. A thermal transfer receiving sheet formed by using a polymer. 2. The thermal transfer receiving sheet according to claim 1, wherein the antistatic agent is a conductive inorganic pigment. 3. An isocyanate group-containing polymer having a polysiloxane moiety, obtained by reacting a polyisocyanate compound with at least one selected from alcohol-modified silicone and amino-modified silicone;
Further, at least an antistatic agent, a composition for forming a back layer containing an adhesive is prepared, and the composition for forming a back layer is applied to one surface of a sheet-like support and dried to form a back layer. The method for producing a thermal transfer receiving sheet according to claim 1, wherein: