Patent ID: 9334360
Filing Date: 2016-05-10
CPC Classification: C08G,C08L

Claim Text:
1. A biodegradable aliphatic-aromatic copolyester composition consisting of copolyester having aliphatic ester groups and aromatic dicarboxylic ester groups, wherein the copolyester is a polymerization reaction product of the following monomers: (a) a dihydric alcohol; (b) an aromatic dicarboxy compound selected from an aromatic dicarboxylic acid, aromatic dicarboxylic (C (c) an adipic acid; wherein the composition further consists of 0 to 1.5 wt. % of a residue of an addition copolymer, a titanium-containing catalyst, and 300 to 450 ppm of a post-polymerization catalyst quenching color reducing compound selected from a C wherein the aliphatic-aromatic copolyester has a number average molecular weight of at least 30,000 Daltons and a polydispersity index from 2 to less than 6; wherein the copolyester composition exhibits an L* value that is 80 to 100 as determined by a colorimeter using D wherein the composition is made by a process comprising polymerizing the monomers to obtain molten copolyester, subsequently combining the color reducing compound with the molten copolyester, and cooling the molten copolyester to obtain said biodegradable aliphatic-aromatic copolyester composition.