Neopentyl glycol, terephthalate, dicarboxy acid,...

Details Neopentyl glycol, terephthalate, dicarboxy acid,... Neopentyl glycol, terephthalate, dicarboxy acid,...

C - Chemistry, Metallurgy

08

G

402/205

C08G 63/20 (2006.01) C09D 167/00 (2006.01)

Patent

CA 1143097

ABSTRACT The invention is directed to a polyester resin, and a method for making it, for use in a powder coating. The resin comprises on oligomer of neopentyl glycol or cyclohexane dimethanol and terephthalic acid, isophthalic acid or dimethyl terephthalate in a mole ratio between about 1.15 and about 1.50, the oligomer being reacted with trimellitic anhydride to provide a trimellitate with the mole ratio oligomer to trimellitate being in the range of between about 2.5 and 5.5. The trimellitate is reacted with a dicarboxylic anhydride or acid with the mole ratio of trimellitate to dicarboxylic anhydride or acid between about 1.5 and about 2.5. The polyester resin has an ICI viscosity at 200°C. between about 20 poises and about 60 poises, an acid value of less than 30, a hydroxyl value between about 20 and about 60, and an equivalent weight between about 935 and about 2800.

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