Patent ID: 6569956
Filing Date: 2003-05-27
Classification: C08G,C09D,Y10S

Abstract:
A method of making a hyperbranched polyol macromolecule, comprising the steps of:a) reacting a starter polyol with a first chain extender which contains a plurality of hydroxyl groups and which also contains a carboxyl group to form a first generation branched core; b) optionally, further reacting the first generation branched core with a first chain extender to form a subsequent generation branched core; c) reacting the first or subsequent generation branched core with a controlled amount of an intermediate reactant selected from the group consisting of phthalic acid, isophthalic acid, orthophthalic anhydride, tetrahydrophthalic anhydride and hexahydrophthalic anhydride to form an ester bridge therewith, thereby forming an intermediate polyester macromolecule; and d) reacting the intermediate polyester macromolecule with a second chain extender having a terminal epoxide group thereon, to form a hyperbranched polyol having both primary and secondary hydroxyl groups thereon.