| 摘要 |
Stable, non-aqueous solvent solutions of acid-functional polymers are prepared by: (a) reacting, in the presence of an esterification catalyst, a hydroxy-functional acrylic polymer with a cyclic carboxylic anhydride at a reaction temperature from about 35 DEG C. to about 76 DEG C. thereby forming an acid-functional polymer having ester groups and carboxylic acid groups; and (b) maintaining the reaction of the anhydride and hydroxyl groups until the desired amount of acid functionality on the acid-functional polymer has been obtained; and then (c) adding to said acid-functional polymer a stabilizing amount of a low-molecular weight alcohol solvent under conditions which will not cause substantial reaction of the solvent and the acid-functional polymer.
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