Patent ID: 7582690

Claim:
A stabilized, aliphatic polyester composition, comprising: (A) at least one aliphatic, thermoplastic polyester comprising residues of at least one substituted or unsubstituted, linear or branched, dicarboxylic acid selected from aliphatic dicarboxylic acids containing 2 to 18 carbon atoms and cycloaliphatic dicarboxylic acids containing 5 to 10 carbon atoms; and residues of at least one, substituted or unsubstituted, linear or branched, diol containing 2 to 18 carbon atoms selected from aliphatic diols, polyalkylene ether glycols, and cycloaliphatic diols; (B) at least one hindered amine light stabilizer selected from one or more compounds having formulas (1) and (3): wherein R 3 , R 4 , R 5 , and R 6 are C 1 -C 22 alkyl; R 7 and R 8 are independently selected from hydrogen, C 1 -C 22 alkyl, and C 1 -C 22 alkoxy; Y 1 is —O—; L 1 is the divalent linking group —C(O)-L 2 -C(O)—; L 2 is C 1 -C 22 alkylene; and R 11 is selected from hydrogen, C 1 -C 22 alkyl, substituted C 1 -C 22 alkyl, and radical A, wherein radical A has the following structure: wherein * designates the position of attachment; (C) at least one tris-aryl-S-triazine UV-absorber; and (D) at least one pentaerythritol diphosphite, wherein the ratio, on a weight/weight basis, of the at least one hindered light amine stabilizer to the at least on one tris-aryl-S-triazine UV absorber ranges from about 2:1 to about 0.2:1.