JPH04197699A - Transfer sheet used for liquid pressure transfer - Google Patents

Abstract

PURPOSE:To protect the surface of a printing layer simultaneously when the printing layer is transferred by a liquid pressure by a method wherein a transparent or translucent surface protective layer made of a water-insoluble resin is formed on a water-soluble or water-wettable substrate, and the printing layer using a vehicle of a water- insoluble resin is formed on the surface of the protective layer. CONSTITUTION:A transparent or translucent surface protective layer made of a water- insoluble resin is formed on the surface of a water-soluble or water-wettable substrate by various printing methods or the like. On the surface of the surface protective layer, required picture patterns, graphics, symbols, or the like are formed by using a vehicle of a water-insoluble resin as a printing layer. This transfer sheet is floated on a liquid surface. The printing layer and the surface protective layer in the transfer sheet are activated by an activator. A transfer medium is pressed down on the transfer sheet from above the liquid surface to be pressed against the transfer sheet. In this manner, the printing layer and the surface protective layer in the transfer sheet are transferred to the transfer medium. Thus, simultaneously with the transfer of the printing layer, the surface protective layer can be formed to protect the transferred printing layer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a transfer sheet used when transferring a printed layer onto the surface of various molded bodies using hydraulic pressure.

[Prior Art] A printing layer is formed on the surface of a molded article that has a complex surface shape, such as a three-dimensional surface (three-dimensional shape) or a curved surface, in particular, as a means of painting with a printing layer. After floating the hydraulic transfer sheet on the water surface (liquid surface) with the printing layer surface on the transfer sheet facing upward, a predetermined molded object (transferred object) to which the printing layer is attached is pressed from above. There is a known method of transferring a printing layer on a transfer sheet to the surface of a molded body by placing
1682, Japanese Patent Publication No. 60-58718), a transfer sheet consisting of a water-soluble or water-swellable support and a printing layer formed on the support and using a water-insoluble resin as a vehicle is utilized. has been done.

In the conventional transfer printing method using a hydraulic transfer sheet, following the process of transferring the print layer of the transfer sheet to the transfer target, a top coat is applied to the transfer surface of the print layer, thereby removing the transferred print. The layer is designed to improve its wear resistance.

[Problems to be Solved by the Invention] However, a method that includes a step of applying a top coat to the transfer surface of the printed layer following the conventional hydraulic transfer step is complicated by the top coat step.

In contrast, the present invention provides a transfer sheet in which a surface protective layer for protecting the surface of the transferred printed layer is formed simultaneously with the transfer of the printed layer by hydraulic pressure.

Further, the present invention provides a transfer sheet in which a surface protective layer for protecting the surface of the transferred printed layer is formed simultaneously with the transfer of the printed layer using hydraulic pressure, and moreover, during the transfer process using hydraulic pressure. To provide a transfer sheet that has good adhesion between the transfer sheet and a transfer object and has good coverage to the transfer surface.

[Means for Solving the Problems] The transfer sheet used in the hydraulic transfer of the first invention is as follows:
A water-soluble or water-swellable support, a transparent to translucent surface protective layer made of a water-insoluble resin formed on the support, and a water-insoluble resin formed on the surface of the surface protective layer. It consists of a printed layer serving as a vehicle.

The transfer sheet used in the hydraulic transfer of the second invention is as follows:
In the structure of the transfer sheet of the first invention, the transparent to translucent surface protective layer made of a water-insoluble resin contains a lubricant.

The transfer sheet used in the hydraulic transfer of the third invention is as follows:
The printed layer on the surface of the surface protective layer has a molecular weight of 2000 to 4.
000 polyethylene wax.

In the transfer sheet used for hydraulic transfer of the present invention having the above structure, a water-soluble or water-swellable film is used as the water-soluble or water-swellable support for forming the printing layer for transfer. For example, polyvinyl alcohol resin, dextrin, gelatin, glue, casein, shellac, gum arabic, starch, protein, polyacrylic acid amide, sodium polyacrylate, polyvinyl methyl ether, copolymer of methyl vinyl ether and maleic anhydride. , copolymer of vinyl acetate and itaconic acid, polyvinylpyrrolidone, acetylcellulose, acetylbutylcellulose, carboxymethylcellulose, methylcellulose.

A material made of hydroxyethyl cellulose, sodium alginate, etc. and having a thickness of about 10 to 100 μm is used.

A transparent to translucent surface protective layer made of a water-insoluble resin formed on a water-soluble or water-swellable support is, for example, a butyl methacrylate polymer, an ethyl methacrylate polymer, a butyl methacrylate/ethyl methacrylate copolymer, It is made of ethyl cellulose, nitrocellulose, polystyrene, polyvinyl chloride, vinyl chloride/vinyl acetate copolymer, etc., and can be applied to the surface of a water-soluble or water-swellable support by gravure printing, roll coke, spray coating, etc. It is formed to a thickness of about 1 to 20 microns using a printing method or the like.

The surface protective layer may contain lubricants, such as waxes such as polyethylene wax, paraffin wax, and Monkun wax, fluorine resins such as polyvinylidene fluoride and polytetrafluoroethylene, silicone resins such as polysiloxane, Furthermore, if a lubricant such as talc is added, the surface protective layer will be given slipperiness due to the mold release performance of the lubricant, which will allow the surface protective layer to release external forces when subjected to friction or scratches. , abrasion resistance and scratch resistance are obtained by exerting the effect of reducing the penetration of external force into the transfer layer.

The lubricant to be added to the surface protective layer should be such that it does not impair the transparency or translucence of the surface protective layer and is compatible with the solvent used to form the protective layer. Polyethylene wax is preferable from the viewpoint of coating performance and coating performance. In particular, the best results are obtained when polyethylene wax with a molecular weight of 2,000 to 4,000 is added in a proportion of 2 to 15% by weight, and
If 0 or more polyethylene wax is used, the transparency of the protective layer will decrease.

The printing layer on the surface of the surface protective layer usually contains an oil-based ink, such as a vehicle for printing ink paint, a coloring agent such as a dye or pigment, and other components added as necessary, a plasticizer, and a stabilizer. , wax/grease, desiccant,
Auxiliary desiccant, curing agent, thickener 1 dispersant.

It is formed from an ink that is sufficiently kneaded with a filler, etc., in a solvent and a diluent.

Vehicles for forming the printing layer include, for example, various oils and fats such as linseed oil and soybean oil 1 synthetic drying oil, rosin,
Copal Dammar.

Resins and processed resins such as hardened rosin, rosin ester or polymerized rosin, rosin-modified phenolic resin, phenolic resin, maleic acid resin, alkyd resin 1 Petroleum resin, vinyl resin, acrylic resin, polyamide resin, epoxy resin Resins, synthetic resins such as aminoalkyd resins, cellulose derivatives such as nitrocellulose and ethylcellulose, rubber derivatives such as chlorinated rubber and cyclized rubber, as well as glue, casein, dextrin, zein, etc. are used.
For example, intaglio printing method, planographic printing method.

A desired pattern, figure, character, symbol, etc. is formed on a printed layer by letterpress printing, screen printing, brush painting, spatula painting, spraying, etc.

The film-forming component in the transparent to translucent surface protective layer made of the water-insoluble resin described above and the vehicle in the printing layer formed on the surface protective layer are both butyl methacrylate polymer and ethyl methacrylate polymer. Union,
When the surface protective layer and the printing layer are made of at least one kind of polymer selected from butyl methacrylate/ethyl methacrylate copolymer, the surface protective layer and the printing layer transferred by hydraulic transfer have flexibility and softness. Has excellent properties,
Due to sufficient elongation and deformation, there is good adhesion between the transfer sheet and the transferred object during the transfer process using hydraulic pressure, resulting in a transfer sheet that has good coverage on the transferred surface. Become.

[Function of the invention] The transfer sheet of the present invention is used in the same manner as the conventional transfer sheet used to form a transfer print layer by hydraulic pressure, and is used in the same manner as the transfer sheet used to form a transfer print layer using hydraulic pressure. and a transparent to translucent surface protective layer covering the printed layer are transferred, and the printed layer for decoration can be seen through the surface protective layer.

That is, in the transfer method using the transfer sheet of the present invention, the transfer sheet is floated on a liquid surface, and the printing layer and surface protection layer applied to the transfer sheet are activated by an activator, and further, For example, plastic molded objects.

By pressing a transfer object such as a metal molded product, wood molded product, glass, or inorganic molded object onto the transfer sheet from above the liquid level, the printing layer and surface protective layer on the transfer sheet are applied to the transfer object. The activator can be applied to activate the printing layer and surface protective layer even after the transfer sheet is floated on the liquid surface or before the transfer sheet is floated on the liquid surface. It may be.

The activator for activating the printing layer and the surface protective layer in the transfer sheet has the property of swelling to part of the vehicle used in the printing layer and the film-forming component of the surface protective layer, and furthermore, A slow-drying solvent that does not dry until the transfer sheet is completely transferred, such as cellosolve, cellosolve acetate, calpitol, carpitol acetate, butyl cellosolve, butyl calpitol,
A single solvent or a mixed solvent of polyhydric alcohol solvents having a boiling point of 100° C. or higher, such as butyl cellosolve acetate and butyl carpitol acetate, are used.

In addition, by mixing a solvent with a boiling point of less than 100°C, such as ketones, with the aforementioned slow-drying solvent, the activator can be used to form a vehicle for the printing layer or a film-forming component for the surface protective layer. The solubility can be improved, and by adding a resin of the same type as the vehicle of the printing layer in the transfer sheet, the adhesion performance of the transfer sheet to the object to be transferred can be improved.

Furthermore, by adding a plasticizer such as DOP or DBP to the activator, it is possible to increase the permeability of the activator to the printing layer and surface protective layer of the transfer sheet, and by adding an extender pigment. By this, the coating suitability of the activator can be improved.

[Example] Hereinafter, the specific structure of the transfer sheet used for liquid transfer of the present invention will be explained using manufacturing examples, and the transfer printing method using the transfer sheet will also be explained. .

Example 1 07g (solid content) was applied to the surface of a 40μ thick polyvinyl alcohol resin film of a repurposed sheet by gravure printing using a printing ink with the following ink composition [IA].
After forming a surface protective layer on the entire surface of 7 m2, a printed layer with an abstract pattern was formed on the surface of the surface protective layer by gravure printing using the following ink composition [IB]. A transfer sheet [1], which is an example of the invention, was obtained.

Ink composition [IA] Butyl methacrylate/ethyl methacrylate copolymer...26 parts by weight Polyethylene wax (molecule 1i: 3000)...10 parts by weight Methyl ethyl ketone...-64 parts by weight Ink composition [IB] Butyl methacrylate/ethyl Methacrylate copolymer - 10 to 20 parts by weight Pigment Titanium oxide (white) Carbon (black) Isoindoline (yellow) Quinacridone (red) Cyanine (blue) 10 to 60 parts by weight Methyl ethyl ketone... 20 to 80 parts by weight Shield unit An activator was prepared according to the following mixture composition [IC1].

Mixed composition [I C] (1) Butyl cellosolve acetate: 26 parts by weight (2) Butylcarpitol acetate: 26 parts by weight (3) Butyl meccrylate polymer: 8 parts by weight (4) Dioctyl phthalate: 20 parts by weight (5 ) 20 parts by weight of precipitated barium sulfate Transfer by hydraulic pressure The above-mentioned transfer sheet was coated with 12 g/m of the activator of the above-mentioned mixed composition [IC] on the printing layer side of the transfer sheet.
2, and then floated on the surface of water at a temperature of 30°C with both printed layers coated with the activator facing upward, and after 1 minute, a polystyrene resin molded body for the outer frame of an air conditioner was formed. was pushed in from above, and the transfer sheet was spread and brought into close contact with the surface of the molded body.

Next, the polystyrene resin molded body with the transfer sheet spread and adhered to the surface was pulled out of the water, and after showering with warm water at 40°C for 30 minutes, it was further showered with clean water to remove the polyvinyl alcohol resin film on the transfer sheet. This was removed and then dried to obtain an outer frame of an air conditioner made of a polystyrene resin molded body onto which the printed layer of the transfer sheet and the surface protective layer covering the printed layer were transferred.

Example 2 The manufacturing process of the transfer sheet of Example 1 was the same as the corresponding process of Example 1, except that polyethylene wax with a molecular weight of 1500 was used instead of polyethylene wax with a molecular weight of 3000 when forming the surface protective layer. The following steps were carried out to obtain a transfer sheet [2] which is another example product of the present invention.

Example 3 In the process of manufacturing the transfer sheet of Example 1, when forming the surface protective layer, instead of a 0.7 g (solid content) 7 m2 of the entire surface solid surface protective layer, a 14 g (solid content) 7 m2 of the entire surface was used. A transfer sheet [3], which is another example product of the present invention, was obtained by carrying out the same steps as the corresponding steps of Example 1 except for forming the surface protective layer.

Comparative Example 1 In the manufacturing process of the transfer sheet of Example 1, the same process as the corresponding process of Example 1 was carried out except that the formation of the surface protective layer was omitted, and a transfer sheet [4] for comparison was carried out. I got this.

[Experimental Examples 1 to 3 and Comparative Example 1] The abrasion fastness of the surface of the molded body having the transfer printing layer obtained in Examples 1 to 3 and Comparative Example 1 was tested using a Gakushin type abrasion fastness tester. The number of times the friction element was moved back and forth until the abstract pattern made of the gravure printing layer completely disappeared was measured.

The results are shown in Table 1.

In addition, in the test using the Gakushin type friction fastness tester, six friction elements with friction cloth (Kanakin No. 3) attached to the surface and a load of 200 g were tested approximately 30 times/min. Tested by reciprocating at speed.

Table 1 [Effects of the Invention] As is clear from the Examples and Comparative Examples, according to the liquid transfer sheet of the present invention, the surface of the transferred printing layer is protected at the same time as the printing layer is transferred by hydraulic pressure. Since a surface protective layer is formed, a decorated molded article with excellent surface abrasion resistance can be obtained without any complicated effort.

Claims (1)

[Claims] 1. A water-soluble or water-swellable support, a transparent to translucent surface protection layer made of a water-insoluble resin formed on the support, and a surface protection layer formed on the surface of the surface protection layer. A transfer sheet used for hydraulic transfer, characterized by comprising a printing layer using a water-insoluble resin as a vehicle. 2. A transfer sheet used for hydraulic transfer according to claim 1, wherein a lubricant is added to the transparent to translucent surface protective layer made of a water-insoluble resin. 3. A transfer material for use in hydraulic transfer according to claim 1 or 2, in which a polyethylene wax with a molecular weight of 2,000 to 4,000 is added to the printing layer formed on the surface of the surface protective layer. sheet.