| abstract |
Disclosed is a carboxyl group-containing resin which is obtained by reacting a monocarboxylic acid (b) with epoxy groups of a resin (a), which has two or more epoxy groups in a molecule, in an amount of 0.3-0.85 mole per equivalent of the epoxy group in the resin (a), then reacting a polybasic acid (d) with epoxy groups of the thus-obtained reaction product (c) in an amount of 0.15-0.95 mole per equivalent of the epoxy group in the reaction product (c), and then further reacting a monocarboxylic acid (f) with epoxy groups of the thus-obtained reaction product (e) in an amount of 1.0-5.0 moles per equivalent of the epoxy group in the reaction product (f). The thus-obtained carboxyl group-containing resin has an acid value of 20-200 mgKOH/g, and is soluble in organic solvents. |