JPS61293269A - Expandable coating material - Google Patents

Abstract

PURPOSE:To provide an expandable coating material which can be expanded easily and safely by heating to give an uneven coated surface, consisting of a thermally expandable, resin compsn. contg. a solvent, a binder, fine thermoplastic particles contg. a chemical blowing agent and an infrared absorber. CONSTITUTION:1pt.wt. fine thermoplastic resin particle (e.g. polyacrylonitrile) contg. a heat-decomposable org. or inorg. blowing agent (e.g. azodicarbonamide), a binder (e.g. acrylic emulsion) and 0.5-2pts.wt. infrared absorber (e.g. carbon black) are dissolved or dispersed in a solvent (e.g. water). Optionally, non- bleeding color pigment, extender pigment, stabilizer, etc., are added thereto to obtain the title expandable coating material composed of a thermally resin compsn.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a foamable coating material that provides an uneven coating surface by heating.

[Prior art]

Conventionally, by forming unevenness on the printing surface or coating surface,
A method for obtaining printed matter with a three-dimensional effect is known as a foam printing method. This foam printing method is suitable for printing on picture postcards, Christmas card 1 advertising notices, clothing, decorative boards, etc., and has a wide range of uses. However, with conventional foam printing materials.

Since the foaming conditions are at a high temperature of 100 to 200° C., a large heating device such as a hot plate or a hot roll is required, which not only increases the cost of the device but also poses a risk of burns and fire.

Therefore, it is difficult to implement the conventional method using foam printing materials at home, school, etc.

〔the purpose〕

An object of the present invention is to provide a foamable coating material that is safe and can be easily foamed using a small heating device.

〔composition〕

According to the present invention, there is provided a foamable coating material comprising a thermally expandable composition containing a solvent, a binder, thermoplastic resin fine particles containing a chemical blowing agent, and an infrared absorbing substance.

The solvent used in the foamable coating material of the present invention is a medium commonly used in conventional inks, paints, etc., such as water and organic solvents, and any conventional solvent may be used. In addition, the binder used is a conventional one that is widely used in conventional water-based or oil-based inks, paints, etc., and ordinary film-forming resins 1, such as acrylic emulsions, ethylene/vinyl acetate copolymer emulsions, etc. That's fine.

In the chemical blowing agent-containing thermoplastic resin fine particles used in the foamable coating material of the present invention, conventionally known thermally decomposable organic and inorganic substances are used as the chemical blowing agent. Examples of organic blowing agents include:

Azodicarbonamide, azobisisobutyronitrile,
Azo compounds such as azobiscyanovaleric acid, dialkyl azodicarboxylate, diazoaminobenzene, N-(phenylazo)sarcosine, N-(phenylazo)-N-methyl-tauryl, S-(phenylazo)thiophenol; benzenesulfonylhydrazide, p- Sulfonyl hydrazide compounds such as toluenesulfonyl hydrazide and p,p'-oxybisbenzenesulfonyl hydrazide;
Amide compounds such as N,N'-dimethyl or N,N'-dinitrosoterephthalamide and the like can be mentioned. Examples of inorganic foaming agents include carbonates such as sodium bicarbonate, ammonium carbonate, and ammonium bicarbonate, and azide compounds such as calcium azide.

These foaming agents can be used in combination with various conventionally known foaming aids for the purpose of controlling their decomposition temperature. In addition, the thermoplastic resin may be one with low gas permeability, for example, one that has gas barrier properties against gases released by decomposition of the blowing agent, such as nitrogen gas and carbon dioxide gas. Examples of the resin include various resins such as polyacrylonitrile, polyvinylidene chloride, polyester, polyamide, polyurethane, and polycarbonate.

In addition to the above-mentioned components, the foamable coating material of the present invention further uses an infrared absorbing substance, and such substances include, for example, black pigments such as carbon black and aniline black,
Examples include infrared absorbing metal oxides and metal sulfides. All of these are visually black or dark-colored substances, but in some cases, light-colored infrared absorbing substances are also used. , 111G002, IRGOO3,
IRG750 etc.) are used. Generally, the amount of the infrared absorbing substance used is 0.000 parts by weight per 1 part by weight of the thermoplastic resin.
The amount is 1 to 5 parts by weight, preferably 0.5 to 2 parts by weight.

The composition of the present invention may optionally contain non-breathing coloring pigments, extender pigments (for example, calcium carbonate, barium sulfate, etc.), and stabilizers (for example).

(organotin type, barium/zinc type, calcium/zinc type, etc.) can be added.

The composition of the present invention is produced according to the method for producing foamed printing materials of this type.

Note that the foamable coating material as used herein includes various inks as well as paints and the like.

〔effect〕

Since the thermally expandable resin composition of the present invention contains an infrared absorbing substance, it can be foamed using a simple commercially available device such as an infrared copying machine, and the foaming operation is easy, safe, and beautiful. Provide printed matter or painted objects with uneven coating surfaces. Moreover, with the composition of the present invention, even if different foaming conditions are used, by adjusting the amount of the infrared absorbing substance contained in the coating material, it is possible to foam to the same extent and at once.

The thermally expandable resin composition of the present invention is applicable not only to foam printing materials in the foam printing method described above, but also to general foam inks, such as
It can also be used in plastisol inks, foaming inks and foaming paints using foaming agents called microspheres.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples. Note that all parts and percentages shown below are based on weight.

Example Vinylidene chloride gas barrier resin (vinylidene chloride)
Acrylonitrile copolymer with vinylidene chloride content of 9
30 parts of a 20% N,N-dimethylformamide solution of 1% or more), 70 parts of a 20% N,N-dimethylformamide solution of an azo blowing agent (2,2'-azobisisobutyronitrile), and calcium carbonate. Contains 20 parts of extender pigment,
The mixture was mixed uniformly using a rice cooker.

Next, 200 parts of water is added to this mixture to precipitate a resin containing 1 blowing agent together with an extender pigment, and after filtering this, it is sufficiently filled with water, and water is added to the obtained filter cake to make 130 parts. To this, 10 parts of polyoxyethylene nonylphenyl ether and 20 parts of 5% hydroxyethyl cellulose were added, stirred and homogenized, and then dispersed for 2 hours using an attritor containing glass beads. and extender pigment (weight ratio = 35:15:5
A resin-containing liquid containing 25% of thermally expandable fine particles consisting of 0) was obtained.

next.

Said resin-containing liquid 80 parts Ethylene-vinyl acetate copolymer emulsion (solid content 55%) 74 parts Ethylene glycol 5 parts Antifoaming agent
0.5 parts Hydroxyethylcellulose 0.5 parts Infrared absorbing substance [-Nihon Kuyakusha, product name: l1IGOO2]
20 parts of the composition were mixed to obtain a thermally expandable printing ink composition of the present invention. This composition was stored in a felt-tip pen, a pattern was drawn on paper, and after drying, it was heated using a commercially available pre-patch (Pandai Co., Ltd. v5) twice as an infrared heating device, and then heated at scale A. The ink layer expanded and bulged, resulting in a printed matter with a beautiful uneven pattern.

Claims (1)

[Claims] (1) A foamable coating material comprising a thermally expandable resin composition containing a solvent, a binder, thermoplastic resin fine particles containing a chemical blowing agent, and an infrared absorbing substance.