Crosslinking agents and flow control agents powdered coating compositions of carboxy containing copolymers epoxy
Abstract
Abstract Powder coating compositions are disclosed. In general, individual powder coating compositions of this invention are a mixture of the following materials. A copolymer of an Alpha , Beta unsaturated carboxylic acid and an ethylenically unsaturated compound is formed in such proportions as to obtain a copolymer with a glass transition temperature in the range of 40*C to 90*C and a molecular weight (Mn) in the range of 2,500 to 8,500. The Alpha , Beta -unsaturated carboxylic acid is present in the copolymer from at least about 3 percent by weight to not more than about 10 percent by weight. Another material of the coating composition is an epoxy resin in the amount of 0.8 to 1.1 epoxy groups for each carboxy group in the copolymer. A third material utilized in forming the powder coating mixture is a flow control agent which forms at least 0.05 percent by weight of the mixture. The flow control agent is a polymer having a molecular weight (Mn) of at least 1,000. The flow control agent also has a glass transition temperature at least 50*C below the glass transition temperature of the copolymer.
Inventors
- 👤 S Labana
- 👤 A Golovoy
- 👤 S Newman
Bibliographic Details
Claims Analysis
Total Claims: 3References Cited (Backward Citations)
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