# US 4,397,723 A · Coating compositions and resin moldings using same

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- Number: US 4,397,723 A
- Document ID: US4397723A
- Status: Granted
- Kind: A
- Application number: 06/247,085
- Filed: 1981-03-24
- Granted: 1983-08-09
- Earliest claimed: 1980-03-27
- Assignees: Matsushita Electric Industrial Co., Ltd.
- Inventors: Takao Inoue; Tamotsu Wakahata; Yukio Maeda; Ikuo Niboshi
- Web page: https://patentgrep.com/patent/US4397723A

## CPC

- C09D 4/00: Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16}
- C09D 4/06: {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)

## Abstract

Coating compositions comprising 100 parts by weight of a mixture composed of 50-98% by weight of at least one multifunctional monomer selected from compounds having 3 or more acryloyloxy groups and/or methacryloxy groups in 1 molecule, and 2-50% by weight of a bifunctional oligomer represented by the following general formula ##STR1## wherein R.sub.1 represents hydrogen or methyl, and n is an integer of 1 through 5, 0.01-10 parts by weight and polymerization inhibitor 10 through 2,000 ppm of a polymerization inhibitor, and being capable of forming a bridge hardened film of superior abrasion resistance, etc. by the application of activation energy rays, and resin moldings using the coating compositions.

## Claims

### Claim 1

A coating composition comprising (1) 100 parts by weight of a mixture which comprises 50-98% by weight of at least one polyfunctional monomer having at least 3 acryloyloxy groups and/or methacryloyloxy groups per molecule, and 2-50% by weight of a bifunctional oligomer of the formula ##STR4## wherein R.sub.1 represents hydrogen or methyl, and n is an integer of 1 through 5, said percentages by weight being based on the total weight of said polyfunctional monomer and bifunctional oligomer, (2) 0.01-10 parts by weight of a light sensitizer, and (3) 10-2,000 ppm of a polymerization inhibitor, said composition being capable of forming a bridge hardened film by the application thereto of activation energy rays.

### Claim 2 (depends on 1)

A coating composition in accordance with claim 1, wherein said mixture in (1) further comprises 5-60% by weight of a bifunctional (meth)acrylate monomer based on the total weight of said polyfunctional monomer, bifunctional oligomer and bifunctional (meth)acrylate monomer.

### Claim 3 (depends on 1)

A coating composition in accordance with claim 1, wherein said mixture in (1) further comprises 2-50% by weight of a monofunctional (meth)acrylate monomer based on the total weight of said polyfunctional monomer, bifunctional oligomer and monofunctional (meth)acrylate monomer.

### Claim 4 (depends on 2)

A coating composition in accordance with claim 2, wherein said mixture in (1) further comprises 2-50% by weight of a monofunctional (meth)acrylate monomer based on the total weight of said polyfunctional monomer, bifunctional oligomer, bifunctional (meth)acrylate monomer and monofunctional (meth)acrylate monomer.

### Claim 5 (depends on 1, 2, 3, 4)

A coating composition in accordance with claim 1, 2, 3 or 4, wherein said polyfunctional monomer is pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, or dipentaerythritol hexa(meth)acrylate.

### Claim 6

A coated resin molding obtained by coating a resin molding with a mixture of the coating composition of 1, 2, 3 or 4 and 5-70% by weight, based on the weight of said mixture, of a mixed organic solvent containing at least 60% by weight, based on the weight of the mixed organic solvent, of an alcohol having 2-4 carbon atoms, and irradiating the thus coated molding with activation energy rays to harden the coating.