Hydrolysis stabilizer for ester group-containing resin

摘要

The present invention provides: a hydrolysis stabilizer for ester group-containing resin, comprising, as the main component, a carbodiimide which is derived from tetramethylxylylene diisocyanate, and which has remaining isocyanate groups in an amount of 3% by weight or less or has the terminal isocyanate groups blocked with a monoisocyanate(s); and a method for hydrolysis stabilization of ester group-containing resin, which comprises mixing an ester group-containing resin with a carbodiimide which is derived from tetramethylxylylene diisocyanate represented by the above formula and which has remaining isocyanate groups in an amount of 3% by weight or less or has the terminal isocyanate groups blocked with a monoisocyanate(s). The above hydrolysis stabilizer for ester type resin is free from the problems of conventional hydrolysis stabilizers for ester type resin; has excellent compatibility with ester type resins such as polyester polyurethane resin and the like; can be easily added with no problem during the synthesis of ester type resin or during the melt-kneading of the resin; moreover, has a high molecular weight; therefore, shows an excellent anti-hydrolysis effect to ester type resins.