Patent ID: 7452933

Claim:
A cross-linked polyethylene composition characteristically comprising (A) 100 weight part of polyethylene; (B) 0.2-0.6 weight part of a mixture of a liquid antioxidant of Formula 1 and a hindered phenol or thio ester solid antioxidant; (C) 0.2-0.9 weight part of polyethylene glycol having a molecular weight of 5,000-70,000; and (D) 1-4 weight part of a cross-linking agent. wherein, R 1 is C 1-20 alkyl substituted or non-substituted with one or more substituents selected from a group consisting of C 2-20 alkenyl, C 3-20 alkynyl, C 5-9 cycloalkyl, phenyl or tolyl, R 2 and R 3 are independently C 1-20 alkyl substituted or non-substituted with one or more substituents selected from the group consisting of phenyl, hydroxyl, cyano, formyl, acetyl and —O—COR 5 , R 5 is C 5-9 cycloalkyl, phenyl, 4-chlorophenyl, 2-methoxycarbonylphenyl, p-tolyl, 1,3-benzthiazole-2-yl, —(CHR 6 ) n COOR 7 or —(CHR 6 ) n CONR 8 R 9 substituted or non-substituted with one or more substituents selected from the group consisting of C 1-20 alkyl, C 2-20 alkenyl, C 3-20 alkynyl and hydroxy, n is 1 or 2; R 6 is H or C 1-6 alkyl; R 7 is C 1-20 alkyl, C 1-20 alkyl containing 1-5 hetero atoms selected from O or S, C 5-9 cycloalkyl, phenyl, benzyl or tolyl; R 8 and R 9 are independently H or C 1-6 alkyl; R 4 is H or methyl.