Cardanol-derivatives modified polymer and a coating composition comprising the same

A cardanol-derivatives modified polymer obtained from a reaction of epoxy groups in a cardanol-derivative compound and carboxyl groups in a carboxyl-functional polymer, wherein the cardanol-derivative compound is a resultant product of cardanol reacted with haloalkylene oxide having a carbon number of from 3 to 10, and an acid number of the carboxyl-functional polymer is from 100 to 200 mg KOH/g, and at least 60% of carboxyl groups in the carboxyl-functional polymer is reacted with epoxy groups in the cardanol-derivative compound, and

• wherein:
• the carboxyl-functional polymer is obtained from copolymerization of monomers selected from the group consisting of hydroxy alkyl (meth)acrylate and monomers selected from the group consisting of a linear or cyclic alkyl dicarboxylic acid or anhydride and lactone;
• or
• the carboxyl-functional polymer is at least one selected from the group consisting of carboxyl-functional polyurethanes and carboxyl-functional polyamides.