Color-stabilized biodegradable aliphatic-aromatic copolyesters, methods of manufacture, and articles thereof

摘要

Biodegradable compositions containing an aliphatic-aromatic copolyester. Methods of making the compositions and articles made from the compositions.

主权项

1. A biodegradable aliphatic-aromatic copolyester, comprising a polymerization reaction product of a:
(a) a dihydric alcohol; (b) an aromatic dicarboxy compound selected from an aromatic dicarboxylic acid, aromatic dicarboxylic (C1-C3)alkyl ester, or a combination thereof; and (c) an adipic acid; in the presence of wherein the copolyester is the product of polymerization in the presence of a titanium catalyst that is a reaction complex comprising titanium and a color-reducing amount of a compound selected from phosphoric acid, phosphorous acid, boric acid, and combinations thereof; wherein the aliphatic-aromatic copolyester has a number average molecular weight of at least 20,000 Daltons and a polydispersity index from 2 to less than 6.