Patent ID: 9388296
Filing Date: 2016-07-12
CPC Classification: C08K,C08L

Claim Text:
1. A crosslinked polyethylene composition wherein the composition is prepared by combining: 100 parts by weight of polyethylene, 0.03-5 parts by weight of crosslinking agent, 0.03-5 parts by weight of crosslinking promoter, and 0.01-1.5 parts by weight of free radical inhibitor, wherein the polyethylene is a copolymer and/or homopolymer containing at least 90 wt. % of vinyl and at least one C 3 -C 8 α-alkenyl, has a density in the range of 0.935-0.960 g/cm 3 , and a melt index in the range of 2.5-17.5 g/10 min at 190° C./2.16 kg; the crosslinking agent is a peroxide crosslinking agent; the crosslinking promoter is an organic substance containing maleimido, (meth)acrylate group, and/or allyl, and/or a polymer containing more than 50% of vinyl; the free radical inhibitor is hydroquinone and/or a substituted hydroquinone selected from the group consisting of 4,4′-thio-bis(6-tert-butyl-3-methyl-phenol), 2,2′-thio-bis(4-methyl-6-tert-butylphenol), 2,2′-thio-bis(4-chloro-6-isopropyl-3-methylphenol), 4,4′-thio-bis(6-tert-butyl-m-cresol), 4,4′-thio-bis(2-methyl-6-tert-butylphenol), 4,4′-thio-bis(2-tert-butyl-5-methylphenol), and mixtures thereof, and the crosslinked polyethylene composition has a crosslinking efficiency index of more than 1,100 Nm/g and a δ torque value of more than 10 Nm at the temperature of 200° C. and 40 rpm.