Pu powder coating compositions and their use for...

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C - Chemistry, Metallurgy

09

D

C09D 175/04 (2006.01) C08G 18/42 (2006.01) C08G 18/80 (2006.01) C09D 167/00 (2006.01)

Patent

CA 2413350

Disclosed is a polyurethane powder coating composition comprising 5-80 wt.% of crystalline or semicrystalline polyester, 10-80 wt.% of amorphous polyester, and 5-30 wt.% of blocked polyisocyanate. The crystalline or semicrystalline polyester is composed of aliphatic dicarboxylic acid, e.g., succinic, adipic, sebacic or dodecanedioic acid and a linear diol, e.g., ethylene glycol, butanediol or hexanediol. The amorphous polyester is composed of isophthalic acid with optionally another dicarboxylic acid and a diol. The polyisocyanate has a urethane group or both urethane and isocyanurate groups and is blocked. The powder coating composition may be used for coating wide variety of substrates such as metallic substrates by conventional powder coating process as well as coil coating process.

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