Patent ID: 7754825

Claim:
A light stabilized copolyetherester composition comprising a melt-mixed blend of: (a) about 94 to about 99.8 weight percent of at least one copolyetherester comprising a multiplicity of recurring long chain ester units and short chain ester units joined head-to-tail through ester linkages, said long chain ester units being represented by formula (I): and said short chain ester units being represented by formula (II): wherein G is a divalent radical remaining after the removal of terminal hydroxy groups from a poly(alkylene oxide) glycol having a number average molecular weight of about 400 to about 6000; D is a divalent radical remaining after removal of hydroxyl groups from a diol having a molecular weight of less than about 250; and R is a divalent radical remaining after removal of carboxyl groups from a dicarboxylic acid having a molecular weight of less than about 300; wherein said short chain ester units comprise about 15 to about 99 weight percent of the copolyetherester and said long chain ester units comprise about 1 to about 85 weight percent of the copolyetherester; (b) about 0.1 to about 4 weight percent of at least one nanoparticulate mineral selected from titanium dioxide, cerium oxide, and zinc oxide; and (c) about 0.1 to about 2 weight percent of at least one organic ultraviolet light stabilizer, which is at least one hindered amine light stabilizer, wherein all weight percentages are based on the total weight of (a)+(b)+(c), and provided that the composition does not contain carbon black.