Modified water-dilutable diolefin polymer oils containing carboxyl groups

Claim 1

A modified, water-dilutable conjugated diolefin polymer oil containing carboxyl groups, obtained by the steps including reacting an α, β-unsaturated compound selected from a monocarboxylic acid, a dicarboxylic acid, a dicarboxylic anhydride, a dicarboxylic acid (semi) ester, a dicarboxylic acid (semi) amide, a dicarboxylic acid imide, and mixtures thereof, with an diolefin polymer oil component substantially free from carboxyl groups, wherein the modified polymer oil is prepared by reacting A. the reaction product of at least one of said α,β-unsaturated compounds with a mixture containing a. from about 80 to 99 parts by weight, of a conjugated diolefin polymer oil substantially free from carboxyl groups with an average molecular weight of from about 500 to 2500, and b. from about 1 to 20 parts by weight, of an olefin polymer oil substantially free from carboxyl groups, selected from degraded rubber, liquid butadiene copolymer and a readily soluble diolefin block copolymer, having an average molecular weight of from about 4500 to 20,000, with B. from about 3 to 15 parts by weight, based on 100 parts by weight of component A of a liquid conjugated diolefin polymer oil substantially free from carboxyl groups which has not been reacted with said α,β-unsaturated compound and the average molecular weight of which is between the average molecular weights of components (Aa) and (Ab).