Patent ID: 7994247

Claim:
A polyester composition comprising the following components (A), (B) and (C): (A) a polyester, (B) a phosphite of the formula (I): wherein R 1 , R 2 , R 4 and R 5 represent independently of one another a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkylcycloalkyl group having 6 to 12 carbon atoms, an aralkyl group having 7 to 12 carbon atoms or a phenyl group; R 3 represent independently of one another a hydrogen atom or an alkyl group having 1 to 8 carbon atoms; X represents a single bond, a sulfur atom or a divalent group of the formula (I-1): in which R 6 represents a hydrogen atom, an alkyl group having 1 to 8 carbon atoms or a cycloalkyl group having 5 to 8 carbon atoms; A represents an alkylene group having 2 to 8 carbon atoms or a divalent group of the formula (I-2): in which R 7 represents a single bond or an alkylene group having 1 to 8 carbon atoms; and * means bonding to the side of an oxygen atom; and either one of Y and Z represents a hydroxyl group, an alkyl group having 1 to 8 carbon atoms, an alkoxyl group having 1 to 8 carbon atoms or an aralkyloxy group having 7 to 12 carbon atoms, while the other of Y and Z represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, and (C) at least one component selected from the group consisting of a neutralizing agent and a compound of the formula (II) and: wherein R 8 represents an alkyl group having 1 to 8 carbon atoms; n is an integer of 1 to 4; and X′ represents a n-hydric alcohol moiety having 1 to 18 carbon atoms which may have a hetero atom and/or a cyclic structure therein, wherein the polyester is polylactic acid.