Patent ID: 7511081
Filing Date: 2009-03-31
Classification: C08J,Y02W

Abstract:
1. A recycling method of a mixed waste of polyester and polyamide, comprising: (a) depolymerizing the mixed waste of polyester and polyamide; (b) polycondensing the depolymerized product with a polyhydric alcohol to obtain a polyester-amide block polymer having an acid value of 1 to 150 mgKOH/g; and (c) recovering the polyester-amide block polymer in a solid or solution state where the acid value is greater than 20 mgKOH/g, or recovering the polyester-amide block polymer in a solid state where the acid value is less than 20 mgKOH/g, wherein in the step (b) a polyamide-producing monomer or waste polyamide is additionally added and reacted to produce a polyamide block, wherein the polyamide-producing monomer or waste polyamide is added in content of 1 to 90% by weight to the obtained polymer, wherein the polyamide-producing monomer is at least one selected from the group consisting of lactams containing more than 6 carbon atoms, aliphatic amino carboxylic acids, and polycondensation products of diacid and diamine, and wherein the waste polyamide is 6-nylon, 6,6-nylon, 11-nylon, or 12-nylon.