JPS6029789B2 - Base paper for thermal transfer paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a base paper for thermal transfer paper that allows designs such as figures or characters to be transferred to a transfer target such as cloth by offset printing.

The object of the present invention is to enable not only silk screen printing, gravure printing, letterpress printing, but also offset multicolor printing when forming patterns on base paper. In addition, the inks used include sublimation inks, pigment inks, dye inks, etc., which are generally referred to as thermal transfer inks, and if it is possible to completely transfer designs printed using ordinary offset inks. I have concluded that. Furthermore, the present invention provides a base paper for thermal transfer paper capable of offset printing, which allows the base paper to be peeled off smoothly from the object to be transferred, even at high temperatures, after the pattern has been thermally transferred to the object to be transferred. be. It is well known that in recent years, transfer printing has come to be widely used as a type of textile printing, but the patterns on thermal transfer paper that are generally used for transfer printing are usually formed using base paper for thermal transfer paper. This is done by gravure printing and silk screen printing.

However, the gravure printing method is unprofitable for small-lot transfer paper production due to the high plate-making costs, and the silk screen printing method is industrially disadvantageous because it involves a large number of steps and is complex, resulting in poor productivity. It has some drawbacks. Recently, as a way to compensate for the above-mentioned drawbacks, there has been a strong demand for base paper for thermal transfer paper that is easy to make, inexpensive, and capable of offset multicolor printing with good production efficiency.

Basically, one of the conventionally known thermal transfer papers is
The configuration shown in the figure is such that a peeling layer 2' made of a heat-melting resin such as wax, polyethylene, or a polyethylene derivative is formed on the surface of a base paper 1, and a peeling layer 2' made of a heat-melting resin such as wax, polyethylene, or a polyethylene derivative is further formed. There is a so-called penetrating type in which a clear layer 3' made of a hot-melt resin is provided, and an ink layer 4 on which a pattern is formed with thermal transfer ink is provided.

Furthermore, as shown in FIG. 2, a release layer 2 made of a thermosetting resin such as a silicone resin or an alkyd resin is formed on the base paper 1, and on top of this a release layer 2 made of a thermosetting resin such as an ethylene-vinyl acetate copolymer resin, a polyester resin, There is a so-called rubber type in which a clear layer 3'' made of acrylic resin or the like is provided, and an ink layer 4 and a thermal adhesive layer 5 are sequentially layered thereon.

The penetrating type and rubber type mentioned above are widely used because they can print on all kinds of fabrics made of synthetic fibers and natural fibers, but the penetrating type has a clear layer 3'.
Since the internal strength of the rubber-type one and the adhesion strength between the release layer 2 and the clear layer 3'' are not more than 100mm/15" side width, which is required for normal offset printing, it is not possible to form patterns using the offset printing method. Since this is not possible, silk screen printing is mainly used because it does not apply stress during printing.

In addition, in the case of the penetrating type, the resin used for the clear layer 3' has a weak ability to fix and hold the ink on the fibers, so it is necessary to use a thermal transfer ink containing a hot melt binder. Further, the peeling between the transfer target and the base paper 6' after hot pressing must be carried out at a high temperature when the peeling layer 2' is melted by heat and maintained in a fluid state. That is, if the time until peeling after hot pressing is too long or if the layer is cooled during the peeling operation, the peeling layer 2' will solidify again and become impossible to peel. In the rubber type, the release layer 2 and the clear layer 3'' are physically separated, and the clear layer 3 is removed after hot pressing.
It is necessary to cool the film to a temperature below which it can be peeled off from the release layer 2 without causing intralayer separation or stringiness before peeling it off.

As a result of various studies on release layers and clear layers in order to eliminate the drawbacks of the base paper for thermal transfer paper, which is a related product described above, the present invention has made it possible to form patterns using an offset printing method, and moreover, It is possible to transfer without any problems even when using offset ink.
This makes it possible to peel off the base paper 6 after hot pressing at both high and low temperatures.

That is, in the present invention, a release layer 2 made of at least one type of thermosetting resin having mold releasability is provided on a base paper 1, and furthermore, a peeling layer 2 made of at least one type of thermosetting resin having mold releasability is provided on the base paper 1. The present invention relates to a base paper for thermal transfer paper capable of offset printing, characterized in that a clear layer 3 is provided in which a wax is mixed in a mixture with one or more types of synthetic resins.

To explain further, the clear layer 3 in the present invention contains one or more thermoplastic resins such as ethylene-vinyl acetate copolymer, polystyrene-polybutadiene block copolymer, synthetic rubber resin, and acrylic resin. A mixture of (
(hereinafter referred to as A group) and heat-melting resins such as rosin resins, terbene resins, petroleum resins, and chroman resins.
species or a mixture of two or more species (hereinafter referred to as B group)
It is characterized by consisting of a mixture of waxes, waxes, and a ternary mixture, and is made of a thermosetting resin with flexibility such as a silicone resin, an amino alkyd resin, or an acrylic copolymer resin provided on the base paper 1. Release layer 2 consisting of at least one type
applied to the surface of. Generally, in order to perform offset printing, it is necessary that the adhesive force between the release layer 2 and the clear layer 3 is greater than or equal to 100 mm/15 lateral width (hereinafter simply referred to as adhesive force) using the 180 o peeling method at a speed of 300 mm/min. It has been experimentally determined that if the adhesive strength is lower than this, the clear layer 3 will be taken by the plumket during printing, making printing impossible.

In the present invention, as a result of repeated studies on the adhesion between the release layer 2 and the clear layer 3, the release layer 2 is made of one or more thermosetting resins such as silicone resin, alkyd resin, and acrylic copolymer resin. Using the mixture, clear layer 3
As for group A, 20 to 8 parts by weight and group B to 8 parts by weight.
When a mixture of 0 to 2 parts by weight is used, more preferably a mixture of 5 parts by weight of group A and 5 parts by weight of group B, the synergistic effect of group A and group B allows release layer 2 and clear layer to be separated. 150-600 evenings between 3 and 15
It has been found that adhesive strength across the width of the sides can be obtained and multicolor printing can be performed without any problems using a normal offset printing method.

Moreover, when peeling off after heat transfer, it takes 100 to 400 minutes/1
Since the adhesive strength is reduced, the transferred pattern can be easily peeled off without damaging it. Clear layer 3 using rosin resin, petroleum resin, etc. like the penetration type
is extremely strongly adhered to the release layer 2, which is made of wax, polyethylene, polyethylene conductor, etc. However, because the internal strength of the resin itself that makes up the clear layer 3 is low, when offset printing is performed, the resin may not be attached to the plunket. Also, for the rubber type, the adhesive strength between the silicone resin, alkyd resin, etc. used for the release layer 2 and the ethylene-pinyl acetate copolymer resin, polyester resin, acrylic resin, etc. used for the clear layer 3 is 50/15 side. It is about the same width, and offset printing is not possible.

During the heat transfer process, the ink and molten clear resin are uniformly mixed and penetrate into the fabric, firmly adhering to the fibers. be done.

At this time, the A group acts as an adhesive that fixes the ink to the fibers, and the B group acts to fluidize the clear layer 3 when heated, allowing it to penetrate into the fabric and improving the adhesiveness of the clear resin. The reason why the mixing ratio of Group A and Group B was set to 20-80:80-20 as described above is that if the mixing ratio of Group B is less than 2% by weight, the adhesion between the release layer and the clear layer will be reduced. This is undesirable because the strength decreases too much, the clear layer is removed by the planket during offset printing, and the clear resin does not penetrate sufficiently into the cloth during transfer. Moreover, if the content of group B exceeds 80% by weight, the internal strength of the clear layer will be weak and the clear layer will be removed by the plumket during offset printing, which is not preferable. Ultimately, the most preferable case is A group:B group=50:50. Further, the wax functions to further facilitate the fluidization of the clear layer 3 and to facilitate its penetration into the cloth.

However, if wax is included in the clear layer 3 in an amount of 20% by weight or more, ink may splatter during printing, which is not preferable. Next, when peeling the base paper 6 from the transfer target, in the case of a penetration type, it is necessary to peel it off at a high temperature.
In the case of a rubber type, it is necessary to cool it down before peeling it off, but with the product of the present invention, the clear resin penetrates into the cloth, so even if it is peeled off at high temperature, the resin will cause intralayer splitting or stringiness. It can be easily removed without having to remove it.

The pattern transferred in the manner described above is one in which the clear resin has penetrated into the cloth, and the texture of the cloth is not impaired.

Further, the transfer paper using the base paper according to the present invention can be transferred to all kinds of synthetic fibers, cloths made of natural fibers, etc. In conclusion, the features of the present invention are the synergistic effect of using heat-melting resins such as rosin resin, terbene resin, petroleum resin, and chroman resin in group B, and the specific mixing ratio of group A, group B, and waxes. be.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but it goes without saying that the present invention is not limited to the following Examples.

Note that all parts in the examples indicate parts by weight. Example 1○
} Peeling layer alkyd resin (trade name: Tespeel SP-2504 manufactured by Tokushima Seyu Co., Ltd.) Part 5 Hardening agent (product name: Dryer 50, manufactured by Tokushima Seyu Co., Ltd.)
1.5 parts toluene
5 Ikarito '21 clear layer ethylene-vinyl acetate copolymer resin (product name: EV-150, manufactured by Mitsui Polychemical Co., Ltd.) 1 Ikaribe ojin resin (product name; Tescon RM-95, manufactured by Tokushima Seishin Co., Ltd.)
1 base vinyl wax (trade name: Wax V, manufactured by Hoechst) 1.5 parts toluene 8 parts Peeling layer '1' of the above composition was coated on high-quality paper with an air knife coater at 90% strength to solidify the solid content. The coating was applied uniformly so that the amount of adhesion was 7 to 8 hours per day, and the solvent was evaporated at 120 to 180 hours.

Next, Clear Layer '21 having the above composition was uniformly applied onto the release layer using an air knife coater so that the solid content was 13 to 15 coats per coat, and the solvent was evaporated at 120 to 180°C. . The adhesive strength between the release layer and the clear layer was measured and was found to be 260 to 300 mm/15 on the side, which was sufficient to withstand offset printing. Print and dry offset ink (product name: FINEINK, manufactured by Dainippon Ink & Chemicals Co., Ltd.) on the thus obtained base paper for thermal transfer paper to create thermal transfer paper.The printed surface is brought into close contact with nit cloth and heated. Using a stamping press machine (thermal transfer device), the printing pattern was transferred to the knit cloth by heating and pressing at a transfer temperature of 600 mm, a transfer pressure of 300 mm/day, and 19 sands for a period of time, and immediately peeling the base paper from the knit cloth. . Transfer efficiency was 100%. The adhesive force between the release layer and the clear layer during this peeling was measured to be 200-230/15 strands, indicating that the peeling resistance was lower than that during printing, and therefore peeling was easy. The resulting transferred fabric had a sharp pattern and a soft texture, and was also excellent in various fastness properties such as washing resistance and abrasion resistance.

Example 2 '11 Release layer acrylic copolymer resin (product name: PH-135 manufactured by Ipposha Yushi Kogyo) 100 parts ) 1 Soto Petroleum Resin (Product name: Alcon P-125 manufactured by Arakawa Chemical Industry Co., Ltd.)
1 Anchor part Vinyl wax (trade name: Wax V, manufactured by Hoechst) 1.5 parts Toluene 8 Base part A release layer m of the above composition was coated with an air knife coater on high-quality paper for 70 min. The coating was applied uniformly for 7 to 8 days per day, and the solvent was evaporated at 120 to 180 degrees.

Next, a clear layer 2} having the above composition was uniformly applied onto the release layer using an air knife coater so that the solid content was 10 to 12 coats/force, and the solvent was evaporated at 120 to 180°C. The adhesive force between the release layer and the clear layer was measured 3
00 to paper 0/15 ribs, which was enough to withstand offset printing. On the thus obtained base paper for thermal transfer paper, offset ink (manufactured by Dainippon Ink and Chemicals) was printed and dried to create thermal transfer paper.The printed surface was adhered to a knit cloth and placed in a hot stamping press machine. The substrate was heated and pressed for 19 seconds at a transfer temperature of 160° C. and a transfer pressure of 300° C., and the base paper was immediately peeled off from the knitted cloth to transfer the printed design onto the knitted cloth. When the adhesive force between the release layer and the clear layer was measured during this peeling, the results were 130~i80/1
The peeling resistance on the 5th side was lower than that during printing, and therefore it was possible to peel off easily. The transfer cloth obtained in the same manner as in Example 1 had a sharp and beautiful pattern and was excellent in various fastness properties.

As described above, the use of the base paper for thermal transfer according to the present invention has had great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural diagram of a penetrating type transfer paper, FIG. 2 is a cross-sectional structural diagram of a rubber-type transfer paper, and FIG. 3 is a cross-sectional structural diagram of a base paper of the present invention. DESCRIPTION OF SYMBOLS 1... Base paper, 2... Release layer, 3... Clear layer, 4... Ink layer, 5... Thermal adhesive layer, 6... ...Base paper, 2'... Penetration type release layer, 3'... Penetration type clear layer, 3''... Rubber type clear layer, 6'...
... Penetration type base paper. 1 diagram ice 2 diagram soup 3 diagram

Claims (1)

[Claims] 1. A release layer 2 made of at least one thermosetting resin having mold releasability is provided on the base paper 1, and furthermore, one or more thermoplastic resins are provided on the base paper 1. A base paper for thermal transfer paper capable of offset printing, characterized in that it is provided with a clear layer 3 in which a wax is mixed in a mixture with one or more types of heat-melting resins. 2 Adhesive force between release layer and clear layer is 100 to 600 g
The base paper for thermal transfer paper according to claim 1, which has a diameter of /15 mm. 3. The base paper for thermal transfer paper according to claim 1 or 2, wherein the mixing weight ratio of the thermoplastic resin and the thermofusible resin in the clear layer is 20 to 80%: 80 to 20%. 4. The wax in the clear layer is 20% by weight or less of the total resin amount of the thermoplastic resin and the thermofusible resin, according to any one of claims 1 to 3. Base paper for thermal transfer paper.