PURPOSE: To produce the subject deriv. which has remarkably improved color tone, odor, stability, etc., and is suitable for a pigment coating agent, a sizing agent for paper making, and a fluxing agent.
CONSTITUTION: The objective deriv. is prepd. by hydrogenating an addition reaction product of an α,β-unsatd. monocarboxylic acid and/or an α,β-unsatd. dicarboxylic acid with a purified rosin.