Patent ID: 7138457

Claim:
A polyester composition, stabilized against the formation of aldehydic contaminants during melt processing of said composition, which comprises (a) a polyester, and (b) an effective stabilizing amount of at least one polymer or copolymer derived from at least one 2-propenoic acid ester monomer of the formula I where R 1 , R 2 and R 3 are independently hydrogen, straight or branched chain alkyl of 1 to 24 carbon atoms, cycloalkyl of 5 to 12 carbon atoms, aralkyl of 7 to 15 carbon atoms, or said alkyl, cycloalkyl or aralkyl which is further substituted by one or more —OR 5 , —NR 6 R 7 , —CO 2 R 8 or —CONR 9 R 10 wherein R 5 , R 6 , R 7 , R 8 , R 9 , and R 10 are independently hydrogen or straight or branched chain alkyl of 1 to 18 carbon atoms; or R 1 , R 2, R 3 are independently a group —CO 2 R 4 , R 4 is a polyhydric alcohol substituent of the formula —E—(OH) n where n is 2 to 4000, and E is a hydrocarbylene moiety.