Tree resistant cable
AssigneeUnion Carbide Chemicals & Plastics Technology Corporation
InventorMichael John Keogh
Life of this patent
Estimating the term…
Abstract
A composition comprising polyethylene and, for each 100 parts by weight of polyethylene, about 0.1 to about 3 parts by weight of the reaction product of (i) an aliphatic diacid anhydride or a polymer or copolymer thereof wherein the anhydride has 4 to 20 carbon atoms; and (ii) a polymer selected from the group consisting of a polycaprolactone, a polyalkylene glycol, a monoalkyl ether of a polyalkylene glycol, and a mixture of two or more of said polymers, the weight ratio of component (ii) to component (i) being in the range of about 0.05:1 to about 1:1.
Claims9
A composition comprising polyethylene and, for each 100 parts by weight of polyethylene, about 0.1 to about 3 parts by weight of the reaction product of (i) an aliphatic diacid anhydride or a polymer or copolymer thereof wherein the anhydride has 4 to 20 carbon atoms;
- and (ii) a polycaprolactone polymer, the weight ratio of component (ii) to component (i) being in the range of about 0.05:1 to about 1:1.
A composition having a WTGR value less than about 15 percent comprising a low density homopolymer of ethylene prepared by a high pressure process having a density in the range of 0.900 to 0.930 gram per cubic centimeter and a melt index in the range of about 0.1 to about 20 grams per 10 minutes and, for each 100 parts by weight of the homopolymer, about 0.5 to about 2.5 parts by weight of the reaction product of (i) maleic anhydride or a polymer or copolymer thereof and (ii) a polycaprolactone polymer, having a molecular weight in the range of about 300 to about 35,000 and the weight ratio of component (ii) to component (i) being in the range of about 0.1:1 to about 0.5:1.
A cable comprising one or more electrical conductors or a core of one or more electrical conductors, each conductor or core being surrounded by a layer of insulation comprising polyethylene and, for each 100 parts by weight of polyethylene, about 0.1 to about 3 parts by weight of the reaction product of (i) an aliphatic diacid anhydride or a polymer or copolymer thereof wherein the anhydride has 4 to 20 carbon atoms;
- and (ii) a polycaprolactone polymer, the weight ratio of component (ii) to component (i) being in the range of about 0.05:1 to about 1:1.
A cable comprising one or more electrical conductors or a core of one or more electrical conductors, each conductor or core being surrounded by a layer of insulation comprising a composition having a WTGR value less than about 15 percent comprising a low density homopolymer of ethylene prepared by a high pressure process having a density in the range of 0.900 to 0.930 gram per cubic centimeter and a melt index in the range of about 0.1 to about 20 grams per 10 minutes and, for each 100 parts by weight of the homopolymer, about 0.5 to about 2.5 parts by weight of the reaction product of (i) maleic anhydride or a polymer or copolymer thereof and (ii) a polycaprolactone polymer, having a molecular weight in the range of about 300 to about 35,000 and the weight ratio of component (ii) to component (i) being in the range of about 0.1:1 to about 0.5:1.
Dependencies are inferred from the claim text.