JP2001150883A - Transfer sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transfer sheet having extremely high fastness of a toner pattern when the toner pattern is transferred onto a body to be transferred. SOLUTION: A transfer sheet is formed of a base sheet on which a release layer, a toner layer, a urethane resin layer and a bonding layer are successively laminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a transfer sheet. More specifically, the present invention relates to a so-called toner transfer sheet in which a symbol layer is formed without employing various printing methods involving complicated plate making operations.

[0002]

2. Description of the Related Art Conventionally, a pattern layer on various transfer sheets has been formed by a printing method involving a complicated plate making operation. However, with the spread of color copiers in recent years, a method of forming the layer by a copying operation has been widely used. Is being done.

As a transfer sheet utilizing such a technique, there is a transfer sheet in which a thermoplastic resin layer is laminated on a base sheet having releasability and a toner layer for forming a pattern is formed thereon. (JP-A-60-230899).

[0004]

When a conventional toner transfer sheet having the above-described structure is used to transfer a toner pattern onto a transfer target such as a cloth, the robustness of the pattern is extremely weak. There has been a problem that it is easily removed by rubbing with a finger or the like or washing. Also, when heat is applied, such as during tumbler drying, the symbols are fused together or fused to other articles, etc.
There is a problem that damage is caused not only to the object to be transferred but also to other articles.

[0005] In addition to the above-mentioned problems, in the case where the transferred object is a knitted fabric or the like having elasticity, the transferred toner pattern is cracked due to the expansion and contraction of the transferred object, which impairs the beauty. There were also problems. Further, when the transfer target is a dark color or a texture with a deep unevenness, the transferred toner pattern is affected by the influence, and the desired color cannot be faithfully reproduced, And the problem that pattern reproducibility is impaired has been pointed out.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a toner transfer sheet that eliminates the above problems.

[0007]

The present inventors have conducted various studies to solve the above-mentioned problems. As a result, if a urethane resin layer having an excellent stretching effect is formed on the toner layer, various problems will be solved. The inventor has obtained the finding that it can be solved, and as a result of further research based on this finding, the present invention has finally been completed.

That is, the present invention relates to a transfer sheet having the following constitution.

1. A transfer sheet comprising a laminate formed by laminating a urethane resin layer on a toner layer.

[0010] 2. A transfer sheet comprising a laminate in which a urethane resin layer and then an adhesive layer are sequentially laminated on a toner layer.

3. A release layer, a toner layer,
A transfer sheet formed by sequentially laminating a urethane resin layer and then an adhesive layer.

4. 4. The transfer sheet according to the above 1, 2 or 3, wherein the urethane resin layer contains a concealing substance.

5. 5. The transfer sheet according to the above 1, 2, 3 or 4, wherein the urethane resin layer contains an organic solvent.

6. 6. The transfer sheet according to the above 3, 4 or 5, wherein a protective layer is provided between the release layer and the toner layer.

[0015] 7. 7. The transfer sheet according to the above item 6, wherein the protective layer is made of a thermosetting resin.

The greatest feature of the present invention is that a urethane resin layer having an excellent stretching effect is formed on the toner layer.

The urethane resin layer imparts elasticity to the toner layer and increases the physical strength of the urethane resin due to its excellent elasticity, permeation and adhesive properties inherent to the urethane resin as a main component of the layer. This has the effect of increasing the adhesive strength of the adhesive layer in contact with the resin layer. Thereby, when the toner layer is transferred to the transfer object, the conventional problems such as peeling off from the transfer object or causing cracks can be wiped out, and an extremely robust toner pattern can be formed on the transfer object. Will be able to hold.

The excellent effect of such a urethane resin is an effect which is not exhibited by a resin other than the urethane resin, for example, an ethylene-vinyl acetate copolymer resin, an acrylic resin, a vinyl chloride resin, and the like. This is an effect that cannot be achieved even when mixed with urethane resin (for example, acrylic urethane resin).

The reason is considered to be that when the resin alone is used other than the above-mentioned urethane resin, various properties inherent in each resin are inferior to those of the urethane resin.

Further, in the case of the latter mixed use, it is presumed that this is because the continuous layer made of the urethane resin is cut by the mixing of another resin, so that various characteristics inherent to the urethane resin are not exhibited. You. Further, the latter case often has disadvantages in terms of cost, and any case is not preferable.

Hereinafter, the present invention will be described in more detail.

The transfer sheet of the present invention is basically formed by sequentially laminating a release layer, a toner layer, a urethane resin layer, and then an adhesive layer on a base sheet.
Further, a protective layer may be provided between the release layer and the toner layer.

Hereinafter, each of the above-mentioned layers will be described.

Substrate Sheet As the substrate sheet used in the present invention, any substrate sheet that has been used for a conventional transfer sheet can be used, and is not particularly limited. For example, various types of papers, various types of plastic films such as PET films, and the like can be cited, but are not limited thereto.

When a relatively high temperature is required for forming a toner layer described later, it is preferable to use heat-resistant paper or a plastic film capable of withstanding the high temperature. In consideration of the paper feeding characteristics, the surface on the side different from the side on which each layer described later is provided can be subjected to antistatic treatment.

Release Layer As the release layer provided on the base sheet, any release layer formed on a conventionally known transfer sheet can be applied, and there is no particular limitation. For example, performing a release treatment according to a conventional method using a known release agent including various waxes, rosins, cellulose derivatives, polyolefins, vinyl resins, silicones, fluororesins, butyral resins, and the like. Can be formed.

It is to be noted that such a known method includes a method in which a known treatment such as a corona treatment or a plasma treatment is performed on the surface of the base sheet in advance, and then the mold release treatment is performed. Needless to say.

Toner Layer The toner layer provided on the release layer is formed by a copying apparatus such as an electrophotographic system or an electrostatic transfer system known as a color copier, various printers for personal computers and word processors, and an inkjet system. Can also be formed. The advantage common to these methods is, of course, the various problems that the printing method involving the plate making operation had, that is, the cost of plate making, the need for skilled printing techniques, etc., were eliminated, and everyone was extremely It is easy to create an image that is faithful to the original image, or an image that is reduced or enlarged, or has various other arrangements.

Normally, such a toner layer is formed in a full-color pattern by each of the above-described devices. However, the toner layer has a simple structure of letters, numerals, symbols, etc., or a monocolor one. Alternatively, it may be formed in a mirror image state in consideration of the composition when the image is transferred onto the transfer object.

The composition of the toner layer varies depending on the type of each of the above-mentioned devices used.
Often composed of a mixture of a coloring agent such as a pigment and a thermoplastic resin. However, the present invention is not limited thereto, and any conventionally known toner may be used as long as it is known as this type of toner.

Urethane Resin Layer The urethane resin layer which is formed on the toner layer and which constitutes the greatest feature of the present invention is formed so as to cover the entire surface of the layer after the toner layer is formed. Is done. The forming method is not limited at all, for example, by using a water or oily ink or paint in which a urethane resin is dissolved or dispersed, using various known printing techniques and coating techniques, and the like. Can be.

The urethane resin layer of the present invention may contain an organic solvent as described below.
In this case, the adhesion of the urethane resin layer to the toner layer is further improved by the action of the organic solvent, so that a more excellent effect can be exhibited. The reason is probably that such an excellent effect is obtained because the contained organic solvent dissolves or swells the thermoplastic resin contained in the toner constituting the toner layer and enhances the adhesion with the urethane resin. It is presumed that it will be.

Examples of such organic solvents include ketone solvents, ester solvents, alcohol solvents, aromatic solvents and the like.

The urethane resin layer of the present invention has the above-mentioned excellent characteristics and, by being present as a lower layer of the toner pattern on the transfer object, can effectively reduce the unevenness of the transfer object such as texture. This is extremely preferable in that it can be provided with an effect such as smoothness for concealment.

When the object to be transferred is of a dark color, it may be preferable to include a concealing substance in the layer. For example, in the case of transferring a light-colored toner pattern onto a dark-colored transfer member, a urethane resin layer may be formed by using a colorant such as a white pigment such as titanium oxide or a hiding filler such as aluminum powder as a hiding substance. In this case, the effect of the dark-colored base can be effectively concealed, so that a clear color toner pattern can be formed on the transfer-receiving body.

On the other hand, when the transfer material is colored with a sublimable dye, the dye is transferred from the transfer material to the toner pattern due to the influence of heat or aging over the transfer operation described later. The toner pattern may be contaminated, but in such a case, the adsorbent such as activated carbon, activated alumina, diatomaceous earth, or carbon black is contained as a concealing substance in the urethane resin layer, thereby making it effective. And the contamination of the toner pattern on the transfer object can be prevented or suppressed.

That is, as the concealing substance contained in the urethane resin layer in the present invention, coloring agents such as dyes and pigments,
Examples include fillers such as aluminum powder, and adsorbents such as activated carbon.

Incidentally, such a urethane resin layer of the present invention can be provided in a laminated state of two or more layers depending on the presence or absence of a concealing substance and the type thereof. When the urethane resin layer contains the colorant, the urethane resin layer is formed so as to have a shape slightly larger than the toner layer, thereby forming a border of the toner pattern on the transfer target body. You can also.

Adhesive Layer The adhesive layer formed on the urethane resin layer may be any type constituting an adhesive layer of a conventionally known transfer sheet, and is not limited at all. In general, it is preferable that a hot-melt resin that is melted by heating and adhered by cooling and solidifying is used as a main component. Here, examples of the hot melt resin that can be used include polyamide, polyester, polyurethane, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, polyvinyl chloride, and polyacrylate. Examples thereof include thermoplastic polymers such as a thermoplastic polymer, but are not limited thereto, and two or more types of hot melt resins can be used in combination.

Next, the method for forming the adhesive layer of the present invention is not particularly limited, and any method may be used. For example, by dissolving the hot melt resin as described above in water or an organic solvent, or by preparing a printing ink by emulsifying or dispersing and suspending, by printing it on the urethane resin layer, An adhesive layer may be formed. This printing ink contains thermosetting resin, plasticizer,
A crosslinking agent, a surfactant, a stabilizer, a lubricant, a viscosity modifier, an adsorbent, and the like can be coexisted.

Further, as a forming method different from the above, for example, before the urethane resin layer on which the adhesive layer is to be formed is dried, the hot melt resin powder is directly sprayed on the urethane resin layer. The adhesive layer can also be formed.

Protective Layer Lastly, a protective layer provided between the above-mentioned release layer and the toner layer will be described.

The transfer sheet of the present invention solves all the problems of the prior art by being constituted by the above-mentioned layers. However, it is possible to obtain a more preferable effect by forming a protective layer. can do.

That is, if the protective layer is formed, it can be effectively protected by being present on the surface of the above-mentioned toner pattern on the transfer-receiving member. Fastness, washing fastness, and the like can be further improved, and a fusion phenomenon at the time of tumbler drying or the like can be more effectively prevented. Furthermore, even when the base sheet used in the present invention does not have sufficient heat resistance against the application of heat during the copying operation by the above-described color copier or the like, the formation of the protective layer allows the base sheet to be formed. The effect that heat resistance can be imparted to the sheet itself can also be obtained.

It is preferable that the protective layer in the present invention is usually composed mainly of the following thermosetting resin.

As an example of such a thermosetting resin,
For example, modified amino resins such as alkyd melamine resins, butylated melamine resins, epoxy melamine resins, aminoalkyd resins; modified epoxy resins such as urethane-modified epoxy resins and silicone-modified epoxy resins; urethanes such as isocyanate-crosslinked urethane resins and polyisocyanate resins Or urea-based resins; other examples include diallyl phthalate resin, modified (meth) acrylic resin, vinyl ester-based resin, polyether ether ketone resin, polyimide resin, polyamide resin, and the like, but are not limited thereto. Instead, one kind or a combination of two or more kinds can be used.

Next, the method for forming the protective layer is not particularly limited, and any method may be used. For example, dissolving the thermosetting resin as described above in water or an organic solvent,
Alternatively, it can be formed by preparing a printing ink or paint by emulsifying or dispersing, and printing or coating it on the entire surface or a part of the release layer (a part where a toner layer is to be formed later). And, if necessary, a crosslinking agent, a catalyst, a matting agent, a coloring agent, a photocatalyst, a surfactant, a viscosity modifier and the like can be co-present in the printing ink or paint.

(Transfer object) The transfer sheet of the present invention formed as described above can be applied to a wide range of objects to be transferred as long as it can withstand transfer conditions such as heating and pressurizing during transfer. The object to be transferred is not particularly limited.
For example, natural fibers, regenerated or semi-synthetic fibers, synthetic fibers, woven fabrics composed of various fibers such as inorganic fibers, knitted fabrics, blended fabrics, blended knitted fabrics, nonwoven fabrics and their respective sewn products, etc. Examples include synthetic resin films and various sheet materials.

[0049]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

In the following examples, “parts” and “%” mean “parts by weight” and “% by weight” unless otherwise specified.

[0051]

Example 1 A 100 μm-thick glassine paper (60 g / m ² ) was used as a base sheet.
After a release layer was formed by a gravure coating method using a silicone release agent, it was cut into A4 size paper so that it could be fed to the following color copier.

Subsequently, this is passed through an electrostatic transfer type color copying machine (Canon Color Laser Copier 730) to reverse copy a gravure photograph of a wild animal, thereby forming a mirror image of the gravure photograph on the release layer by toner. It was formed as a layer.

Next, a urethane resin (SAMPLEN 351)
0, manufactured by Sanyo Kasei Co., Ltd.) 50 parts, methyl isobutyl ketone (combined as a solvent for the ink vehicle and the organic solvent of the present invention) 20 parts, isophorone (as before) 10 parts, defoamer Using an ink composition comprising 1 part and 20 parts of titanium oxide as a concealing substance, the above-mentioned toner layer was printed and applied with a thickness of 40 μm by a screen coating method to form a urethane resin layer.

Subsequently, while the urethane resin layer is still in a wet state without being dried, a polyamide hot melt resin (Diamid 450 P-3, manufactured by Daicel Chemical Co., Ltd.) is sprayed to form an adhesive layer. The transfer sheet of the present invention was obtained by performing a heat treatment at 3 ° C. for 3 minutes.

The adhesive layer side of the transfer sheet thus obtained was brought into contact with a black cotton knit, and heated and pressed at 150 ° C. and 300 g / cm ² for 20 seconds using a thermal transfer machine. When this was cooled and the base sheet was peeled off, the photographic toner pattern of the wild animal was clearly formed on the black cotton knit.

The obtained toner pattern had excellent fastness to friction and fastness to washing, and did not fuse when heat-dried with a tumbler dryer. Further, even when the cotton knit was repeatedly expanded and contracted, the design did not crack.

[0057]

Example 2 A polyester film having a thickness of 100 μm was used as a base sheet, and a release layer was formed on one surface of the polyester film by a bar coating method using a silicone / wax mixed release agent.

Subsequently, on this release layer, a urethane-modified epoxy resin (Epokey 803, manufactured by Mitsui Toatsu Chemicals, Inc.) 15
Parts, butylated melamine resin (Uban 20 SE60,
A gravure coat of an ink consisting of 10 parts of Mitsui Toatsu Chemical Co., Ltd. and 75 parts of toluene was applied to a thickness of 5 μm.
A protective layer was formed by performing a heat treatment at 80 ° C. for 30 seconds.

The release sheet and the protective layer formed on the base sheet in this manner are passed through a color copying machine (described above) to reversely copy a photograph of the scenery of the old castle. A mirror image was formed as a toner layer.

Next, an ink composition comprising 75 parts of a urethane resin aqueous solution (Superflex E-2000, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), 5 parts of carboxymethylcellulose, and 20 parts of titanium oxide as a concealing substance was coated to a thickness of 50 μm. A urethane resin layer was formed by screen printing.

Thereafter, after the urethane resin layer has dried,
Polyester hot melt resin (Byron 902
P, manufactured by Toyobo Co., Ltd.) 30 parts, carboxymethylcellulose 5 parts, polyurethane resin aqueous solution (Superflex)
E-2000) An adhesive layer was formed on the urethane resin layer by a screen printing method using an ink composition consisting of 5 parts and 60 parts of water, and this was dried to obtain a transfer sheet of the present invention.

The transfer sheet thus obtained was brought into contact with the above-mentioned adhesive layer side with a red cotton T-shirt, and heated and pressed at 180 ° C. and 300 g / cm ² for 10 seconds using a thermal transfer machine. When the base sheet was immediately peeled off, the photographic toner pattern of the old castle scene was clearly formed on the red cotton T-shirt.

The obtained toner pattern had excellent friction fastness and washing fastness, and did not fuse even when heat-dried with a tumbler dryer. The pattern was not cracked even when was repeatedly expanded and contracted.

[0064]

Example 3 Example 1 was the same as Example 1 except that the following protective layer was formed between the release layer and the toner layer.
In the same manner as in the above, a transfer sheet of the present invention was obtained.

Here, the protective layer is composed of 25 parts of a polyurethane resin (Chrisbon 3454, manufactured by Dainippon Ink) and a polyisocyanate resin (Coronate H) on the release layer.
L, manufactured by Nippon Polyurethane Co.) Gravure coated with an ink composed of 5 parts and 70 parts of toluene to a thickness of 10 μm, and subjected to a heat treatment at 150 ° C. for 40 seconds to form a protective layer composed of an isocyanate-crosslinked urethane resin. did.

The adhesive layer side of the transfer sheet thus obtained was brought into contact with the same black cotton knit as in Example 1 and heated and pressed under the same conditions as in Example 1 so that the black cotton knit was removed. Was formed with a toner pattern.

The obtained toner pattern had excellent friction fastness and washing fastness, and when heat-dried with a tumbler drier, was further dried at a higher temperature than that of Example 1. Also, the design did not fuse.

[0068]

Example 4 In Example 1, the protective layer of Example 3 was provided, and further, on the urethane resin layer containing the opaque substance, the opaque substance (the ink composition used to form the layer) was used. Using an ink composition having the same composition as the above except that it does not contain titanium oxide (20 parts), a urethane resin layer containing no concealing substance was formed by screen printing with a thickness of 40 μm. In the same manner as in Example 1, a transfer sheet of the present invention was obtained.

The adhesive layer side of the transfer sheet thus obtained was brought into contact with the same black cotton knit as in Example 1, and was heated and pressed under the same conditions as in Example 1 so that the black cotton knit was removed. Was formed with a toner pattern.

The obtained toner pattern had excellent fastness to friction and fastness to washing, and did not fuse at all even when heat-dried with a tumbler dryer.

[0071]

Comparative Example 1 The procedure of Example 1 was repeated, except that the urethane resin layer of Example 1 was replaced with a commercially available acrylic resin printing binder (a mixture of titanium oxide and an emulsion of polyacrylate). A transfer sheet was prepared in the same manner as described above, and a black cotton knit having a photographic toner pattern of a wild animal was obtained in the same manner as in Example 1 using the transfer sheet.

The obtained toner pattern easily cracks when the cotton knit is repeatedly expanded and contracted, and peels off easily by lightly rubbing with a finger. A part of the pattern was observed to fall off. Furthermore, when drying was performed under the same conditions as those in Example 1 using a tumbler dryer, the symbols fused together.

[0073]

Comparative Example 2 Instead of the urethane resin layer of Example 1, an acrylic urethane resin layer was formed by using a commercially available acrylic urethane resin printing binder (a mixture of titanium oxide and a mixed emulsion of polyacrylate and urethane resin). Except for the above, a transfer sheet was prepared in the same manner as in Example 1, and a black cotton knit having a photographic toner pattern of a wild animal was obtained using the transfer sheet in the same manner as in Example 1.

When the obtained cotton knit is repeatedly expanded and contracted, the resulting toner design generates cracks,
Partially detached toner patterns were observed by washing.

According to the above results, it can be seen that the use of the urethane resin layer of the present invention provides excellent effects as compared with the case where another resin layer is used.

[0076]

According to the transfer sheet of the present invention, a urethane resin layer having an excellent stretching effect is formed on a toner layer, and the urethane resin layer is formed of a urethane resin which is a main component of the layer. The excellent elasticity, permeation and adhesive properties provide the effect of imparting elasticity to the toner layer and increasing its physical strength, and also increase the adhesive strength of the adhesive layer in contact with the resin layer. To play.

By the action of the urethane resin layer,
When the toner layer of the transfer sheet of the present invention is transferred to a transfer object, there is no conventional problem that the toner layer peels off or cracks from the transfer object, and an extremely robust toner pattern is formed on the transfer object. Can be formed.

Continued on front page F-term (reference) 3B005 FA06 FB13 FB23 FB25 FB27 FB40 FC06Y FC07Y FC09Y FC09Z FE01 FG10Y 4F100 AA21 AA21H AK01E AK46G AK51B AK52 AR00C AR00E AS00A AS00E AT00B BA10 BA10 BA10 BA10 BA10 BA10 BA10 BA10 JL14E JN02B JN30B 4J004 AA06 AA07 AA10 AA14 AA15 AA16 AB03 CA02 CA06 CB02 CC02 CC03 CC04 CD01 CD05 CD06 FA01

Claims (7)

[Claims] 1. A transfer sheet comprising a laminate in which a urethane resin layer is laminated on a toner layer. 2. A transfer sheet comprising a laminate in which a urethane resin layer and an adhesive layer are sequentially laminated on a toner layer. 3. A transfer sheet obtained by sequentially laminating a release layer, a toner layer, a urethane resin layer, and an adhesive layer on a base sheet. 4. The transfer sheet according to claim 1, wherein the urethane resin layer contains a concealing substance. 5. The transfer sheet according to claim 1, wherein the urethane resin layer contains an organic solvent. 6. The transfer sheet according to claim 3, wherein a protective layer is provided between the release layer and the toner layer. 7. The transfer sheet according to claim 6, wherein the protective layer is made of a thermosetting resin.