Powder coating composition containing vinylidene fluoride copolymer and methyl methacrylate copolymer
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United States of America Patent
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Apr 22, 2003
Grant Date -
Jun 7, 2001
app pub date -
Jun 17, 1998
filing date -
Dec 18, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To provide a powder coating composition being capable of forming a coating film which has good pigment dispersibility, is excellent in weather resistance, film forming ability, appearance and stain-proofing property and, when used for PCM, is difficult to cause cracks because of its particularly excellent bending resistance at the time of bending of a metal plate. The powder coating composition comprises a powder which contains 100 parts by weight of a vinylidene fluoride copolymer having a melting point of not higher than 150.degree. C., a crystallinity of not higher than 35% and a weight average molecular weight (Mw) of 1.times.10.sup.4 to 5.times.10.sup.5 and 10 to 400 parts by weight of a methyl methacrylate copolymer having a glass transition temperature of not higher than 110.degree. C. and a weight average molecular weight of 1.times.10.sup.4 to 5.times.10.sup.5 ; an average particle size of particles constituting the powder being from 1 to 100 .mu.m and an apparent density of the powder being from 0.2 to 1 g/ml.
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