Patent ID: 7883642

Claim:
An antioxidant composition consisting essentially of an antioxidant represented by the following formula (I) and a metal salt of fatty acid of a carbon number of 4 to 18, a polyethylene wax having a molecular weight of not higher than 10000, wherein the weight ratio of the antioxidant and the metal salt of fatty acid is in a range of 100:2 to 100:100, and wherein the concentration of the antioxidant represented by the formula (I) is not less than 50% by weight based on the antioxidant composition wherein R 1 , R 2 , R 4 and R 5 each represent independently a hydrogen atom, an alkyl group of a carbon number of 1 to 8, a cycloalkyl group of a carbon number of 5 to 8, an alkylcycloalkyl group of a carbon number of 6 to 12, an aralkyl group of a carbon number of 7 to 12, or a phenyl group; R 3 represents a hydrogen atom or an alkyl group of a carbon number of 1 to 8; X represents a single bond, a sulfur atom or a —CHR 6 — group, where R 6 represents a hydrogen atom, an alkyl group of a carbon number of 1 to 8 or a cycloalkyl group of a carbon number of 5 to 8; A represents an alkylene group of a carbon number of 2 to 8, or a *—COR 7 group, wherein R 7 represents a single bond or an alkylene group of a carbon number of 1 to 8, and the symbol * represents that this position and an oxygen atom in the >P—O— group in the formula (I) are bound; one of Y and Z represents a hydroxyl group, an alkoxy group of a carbon number of 1 to 8, or an aralkyloxy group of a carbon number of 7 to 12, and the other of Y and Z represents a hydrogen atom or an alkyl group of a carbon number of 1 to 8; provided that when Y is a hydroxyl group, any one of R 4 and R 5 represents an alkyl group of a carbon number of 3 to 8, a cycloalkyl group of a carbon number of 5 to 8, an alkylcycloalkyl group of a carbon number of 6 to 12, an aralkyl group of a carbon number of 7 to 12, or a phenyl group, and the R 1 in the formula (I) may be the same or different, the R 2 in the formula (I) may be the same or different, and the R 3 in the formula (I) may be the same or different.