Acid-modified polyesters and their use in stoving enamels

Details Acid-modified polyesters and their use in stoving enamels Acid-modified polyesters and their use in stoving enamels

C - Chemistry, Metallurgy

08

G

C08G 63/20 (2006.01) C08G 63/60 (2006.01) C09D 167/00 (2006.01)

Patent

CA 2115909

Abstract Acid-modified polyesters and their use in stoving enamels Acid-modified polyesters obtained by reacting (a) from 20 to 60, preferably 30-50, mol% of at least one dicarboxylic acid, (b) from 3 to 30, preferably 5-20, mol% of a dihydroxy- alkanecarboxylic acid, (c) from 10 to 60, preferably 20-50, mol% of a diol, (d) from 0 to 30 mol% of a polyalcohol having more than two OH groups or of a polycarboxylic acid, and (e) from 0 to 20, preferably up to 10, mol% of a mono- carboxylic acid, the ratio of the sum of the hydroxyl equivalents to the sum of the carboxyl equivalents in the reactants being between 0.5 and 2.0, the quantities of free hydroxyl groups in the end product being between 30 and 350 mmol of hydroxyl groups per 100 g of solid resin, preferably between 100 and 250 mmol of hydroxyl groups per 100 g of solid resin, and the content of free, neutralized and/or neutralizable acid groups being between 5 and 350 mmol of acid groups per 100 g of solid resin, preferably between 9 and 120 mmol of acid groups per 100 g of solid resin.

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