Claims
- 1. A thermosetting powder coating composition comprising a resin composition containing (a) 60 to 97 weight % of a flouroresin having reactive group for crosslinking in the molecule which contains 10 weight % or more of fluorine and has glass transition temperature in the range from 35.degree. to 120.degree. C., (b) 3 to 40 weight % of a hardener which can form crosslinking by reaction with the reactive group for crosslinking in the flouroresin (a), (c) 0.01 to 10 weight parts of a synthetic wax or a natural wax based on 100 weight parts of the resin composition and (d) 0.001 to 1.0 weight parts of a material as a coupling agent based on 100 weight parts of the resin composition.
- 2. A thermosetting powder coating composition as claimed in claim 1, wherein the decrease of weight by heating of the flouroresin (a) is 2% or less.
- 3. A thermosetting powder coating composition as claimed in claim 1, wherein the flouroresin (a) has a hydroxyl value in the range from 1 to 200 mgKOH/g.
- 4. A thermosetting powder coating composition as claimed in claim 1, wherein the flouroresin (a) has an acid value in the range from 1 to 200 mgKOH/g.
- 5. A thermosetting powder coating composition as claimed in claim 1, wherein the flouroresin (a) has an epoxy equivalent in the range from 100 to 15000 g/eq.
- 6. A thermosetting powder coating composition as claimed in claim 1, wherein the synthetic wax or the natural wax (c) has a melting point in the range from 50.degree. to 280.degree. C.
- 7. A thermosetting powder coating composition comprising a resin composition containing (a) 60 to 97 weight % of a component comprising (i) a fluororesin and (ii) a resin for thermosetting powder coating material, wherein the fluororesin has a reactive group for crosslinking in the molecule, contains 10 weight % or more of fluorine, has glass transition temperature in the range from 35.degree. to 120.degree. C. and is present in an amount of 99 to 50 weight % based on the total of (i) and (ii) and the resin has a reactive group and is present in an amount of 1 to 50 weight % based on the total of (i) and (ii), (b) 3 to 40 weight % of a hardener which can form crosslinking by reaction with the reactive group for crosslinking in the fluororesin (i) of (a), (c) 0.01 to 10 weight parts of a synthetic wax or a natural wax based on 100 weight parts of the resin composition and (d) 0.001 to 1.0 weight parts of a material as a coupling agent based on 100 weight parts of the resin composition.
- 8. A thermosetting powder coating composition as claimed in claim 7, wherein the resin for thermosetting powder coating material is a polyester resin, an acrylic resin or an epoxy resin having one, two or three reaction groups selected from the group consisting of hydroxyl, acid and epoxy groups.
- 9. A thermosetting powder coating composition comprising a resin composition containing (a) 60 to 97 weight % of a component comprising (i) a fluororesin and (ii) a thermoplastic resin, wherein the fluororesin has a reactive group for crosslinking in the molecule, contains 10 weight % or more of fluorine, has a glass transition temperature in the range from 35.degree. to 120.degree. C. and is present in an amount of 99 to 50 weight % based on the total of (i) and (ii) and the thermoplastic resin is present in an amount of 1 to 50 weight % based on the total of (i) and (ii), (b) 3 to 40 weight % of a hardener which can form crosslinking by reaction with the reactive group for crosslinking in the fluororesin of (a), (c) 0.01 to 10 weight parts of a synthetic wax or a natural wax based on 100 weight parts of the resin composition and (d) 0.001 to 1.0 weight parts of a material as a coupling agent based on 100 weight parts of the resin composition.
- 10. A thermosetting powder coating composition as claimed in claim 9, wherein the resin for thermoplastic coating material is an acrylic resin, a polyester resin, a nylon resin or a fluororesin having softening point of 60 .degree. to 200 .degree. C.
- 11. A thermosetting powder coating composition as claimed in claim 1, wherein the fluororesin of (a) has a glass transition temperature in the range from 40.degree. to 100.degree. C. and the decrease of weight thereof by heating is 1% or less.
- 12. A thermosetting powder coating composition as claimed in claim 1, wherein the fluororesin of (a) has a hydroxyl value in the range from 20 to 140 mgKOH/g.
- 13. A thermosetting powder coating composition as claimed in claim 1, wherein the fluororesin of (a) has an acid value in the range from 3 to 140 mgKOH/g.
- 14. A thermosetting powder coating composition as claimed in claim 1, wherein the fluororesin of (a) has an epoxy equivalent in the range from 300 to 14000 g/eq.
- 15. A thermosetting powder coating composition as claimed in claim 7, wherein the resin (ii) is an epoxy resin.
- 16. A thermosetting powder coating composition as claimed in claim 7, wherein the resin (ii) is a bisphenol A type resin epoxy resin having a softening point of 40.degree. to 150.degree. C. and an epoxy equivalent between 400 to 6000 g/eq.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-292367 |
Oct 1991 |
JPX |
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4-234191 |
Aug 1992 |
JPX |
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Parent Case Info
This application is a continuation-in-part application of application Ser. No. 07/959,579 filed Oct. 13, 1992, now U.S. Pat. No. 5,223,562.
US Referenced Citations (11)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0219372 |
Dec 1984 |
JPX |
0018317 |
Jan 1985 |
JPX |
0243378 |
Oct 1988 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Smarsh, Joseph, "Powder Coating: Why--How--When", Journal of Paint Technology, vol. 44, No. 565, Feb. 1972. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
959579 |
Oct 1992 |
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