Claims
- 1. A resin composition for powder coatings, which comprises,
- (A) a resin comprising (a) 10 to 90 wt. % of an acrylic resin (A-1) having a viscosity of 100 to 800 poises at 140.degree. C. that is a copolymer obtained by polymerizing 10 to 50 wt. % of a monomer component (a-1) represented by the formula (I): ##STR3## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or a lower alkyl group, with 90 to 50 wt. % of another monomer component (a-2) comprising one or more monomers copolymerizable with said monomer component (a-1) and
- (b) 90 to 10 wt. % of an acrylic resin (A-2) having a viscosity of 1,000 to 5,000 poises at 140.degree. C. that is a copolymer obtained by polymerizing 10 to 50 wt. % of a monomer component (a-1) represented by the formula (I) given above and 90 to 50 wt. % of monomer component (a-2) comprising one or more monomers copolymerizable with said monomer component (a-1) and
- (B) a polybasic acid compound obtained by reacting a polybasic acid and a polyhydric alcohol and having a viscosity of 100 to 2,000 poises at 140.degree. C. wherein the resin and polybasic acid compound are blended to that the equivalent ratio of the glycidyl groups in the acrylic resins (A-1 and A-2) to the acid groups in the polybasic acid compound (B) is from 1.5 to 0.5 and wherein said resin composition forms a film having a 60.degree. gloss of 60 or less.
- 2. The resin composition for powder coatings as claimed in claim 1, wherein the resin comprises 20 to 80 wt. % of the acrylic resin (A-1) and 80 to 20 wt. % of the acrylic resin (A-2), of total weight of acrylic resins.
- 3. The resin composition for powder coatings as claimed in claim 1, wherein the acrylic resin (A-1) contains 10 to 40 wt. % of the monomer component (a-1).
- 4. The resin composition for powder coatings as claimed in claim 1, wherein the acrylic resin (A-1) contains 20 to 40 wt. % of the monomer component (a-1).
- 5. The resin composition for powder coatings as claimed in claim 1, wherein the acrylic resin (A-2) contains 10 to 40 wt. % of the monomer component (a-1).
- 6. The resin composition for powder coatings as claimed in claim 1, wherein the acrylic resin (A-(A-2) contains 20 to 40 wt. % of the monomer component (a-1).
- 7. The resin composition for powder coatings as claimed in claim 1, wherein the monomer component (a-1) represented by formula (I) is one or more selected from the group consisting of glycidyl acrylate, glycidyl methacrylate, .beta.-methylglycidyl acrylate, and .beta.-methyl-glycidyl methacrylate.
- 8. The resin composition for powder coatings as claimed in claim 1, wherein the monomer component (a-1) represented by formula (I) is glycidyl methacrylate.
- 9. The resin composition for powder coatings as claimed in claim 1, wherein the monomer component (a-2) is one or more selected from the group consisting of acrylic acid, methacrylic acid, alkyl esters of acrylic acid and methacrylic acid, hydroxyalkyl esters, cyclohexyl esters, vinyl series monomers, acrylonitriles, methacrylonitriles, acrylamides and methacrylamides.
- 10. The resin composition for powder coatings as claimed in claim 1, wherein the monomer component (a-2) is one or more selected from the group consisting of methyl methacrylate, n-butyl methacrylate, and styrene.
- 11. The resin composition for powder coatings as claimed in claim 1, wherein the polybasic acid compound (B) is a polyester resin which is obtained from the reaction of an excess of one or more carboxylic acids selected from the group consisting of aromatic or aliphatic carboxylic acids and aromatic or aliphatic hydroxycarboxylic acids with polyols and which has a carboxyl group as a terminal group.
- 12. The resin composition for powder coatings as claimed in claim 11, wherein the carboxylic acid is terephthalic acid or isophthalic acid.
- 13. The resin composition for powder coatings as claimed in claim 11, wherein the polyol is a polyalcohol having 2 to 6 hydroxyl groups, bisphenol A, or alkyleneoxide adduct of hydrogenated bisphenol A.
- 14. The resin composition for powder coatings as claimed in claim 11, wherein the polyol is ethylene glycol or neopentyl glycol.
- 15. The resin composition for powder coatings as claimed in claim 1, wherein the equivalent ration of the glycidyl groups in the acrylic resins (A) to the acid groups in the polybasic compound (B) is 1.2 to 0.6.
- 16. A method for powder coating a material to be coated, which comprises coating the material with a resin composition for powder coatings comprising,
- (A) a resin comprising (a) 10 to 90 wt. % of an acrylic resin (A-1) having a viscosity of 100 to 800 poises at 140.degree. C. that is a copolymer obtained by polymerizing 10 to 50 wt. % of a monomer component (a-1) represented by the formula (I): ##STR4## wherein R.sub.1 and R.sub.2 each represent a hydrogen atom or a lower alkyl group, with 90 to 50 wt. % of another monomer component (a-2) comprising one or more monomers copolymerizable with said monomer component (a-1) and
- (b) 90 to 10 wt. % of an acrylic resin (A-2) having a viscosity of 1,000 to 5,000 poises at 140.degree. C. that is a copolymer obtained by polymerizing 10 to 50 wt. % of a monomer component (a-1) represented by the formula (I) given above and 90 to 50 wt. % of other monomer component (a-2) comprising one or more monomers copolymerizable with said monomer component (a-1) and
- (B) a polybasic acid compound obtained by reacting a polybasic acid and a polyhydric alcohol and having a viscosity of 100 to 2,000 poises at 140.degree. C. wherein the resin and polybasic acid compound are blended so that the equivalent ratio of the glycidyl groups in the acrylic resins (A-1 and A-2) to the acid groups in the polybasic acid compound (B) is from 1.5 to 0.5 and wherein the coating has a 60.degree. gloss of 60 or less.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-272434 |
Oct 1990 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/674,467, filed Mar. 25, 1991, now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3857905 |
Blackley |
Dec 1974 |
|
4499239 |
Murakami |
Feb 1985 |
|
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Number |
Date |
Country |
2522614 |
Dec 1975 |
DEX |
49-47456 |
May 1974 |
JPX |
49-53239 |
May 1974 |
JPX |
50-151225 |
Dec 1975 |
JPX |
51-125109 |
Nov 1976 |
JPX |
56-136856 |
Oct 1981 |
JPX |
1391863 |
Apr 1975 |
GBX |
2242196 |
Sep 1991 |
GBX |
Non-Patent Literature Citations (1)
Entry |
Chemical Abstracts, vol. 84, Abstract No. 123504 & JPA 50-151225. |
Continuations (1)
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Number |
Date |
Country |
Parent |
674467 |
Mar 1991 |
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