Low smoke power cable sealant
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsLeonard Leibowitz, Robert A. Nosal
Life of this patent
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Abstract
Electrical power cables and sealants used in their manufacture are described. The pumpable sealants are manufactured with a smoke suppressant composition comprising a combination of alumina trihydrate ATH and magnesium hydroxide.
Claims8
A water tight, electrical power cable which includes a non-halogenated pumpable sealant composition consisting essentially of:
- (a) 3 to 10% by weight of a styrene-containing hydrogenated diblock and/or triblock copolymer,
- (b) 70 to 82% by weight of a smoke suppressant composition,
- (c) 10 to 20% by weight of petrolatum or mineral oil,
- (d) from 0 to about 3% by weight of an organic plasticizer for the block copolymer,
- (e) from 0 to about 0.5% by weight of a stabilizer,
- (f) from 0 to about 5% by weight of a smoke suppressant additive, wherein the smoke suppressant composition comprises a combination of alumina trihydrate and magnesium hydroxide in proportions of 4:1 to 1:4, and said sealant composition exhibits a smoke index of less than 45.
A water tight, electrical power cable which includes a non-halogenated pumpable sealant composition which comprises:
- (a) 4 to 6% by weight of a styrene-ethylene-butylene-styrene diblock and/or triblock copolymer,
- (b) 70 to 82% by weight of a smoke suppressant comprising a combination of alumina trihydrate and magnesium hydroxide in a proportion of 2:1 to 1:2,
- (c) 14 to 18% by weight of petrolatum or mineral oil,
- (d) 1-3% by weight of an organic plasticizer for the block copolymer,
- (e) 0.1-0.5% by weight of a hindered phenol stabilizer and said sealant composition exhibits a smoke index of less than 45.
An electrical power cable sealant composition having a non-halogenated pumpable viscosity which comprises:
- (a) 3 to 10% by weight of a styrene-containing hydrogenated diblock and/or triblock copolymer,
- (b) 70 to 82% by weight of a smoke suppressant composition,
- (c) 10 to 20% by weight of petrolatum or mineral oil,
- (d) from 0 to about 3% by weight of an organic plasticizer for the block copolymer,
- (e) from 0 to about 0.5% by weight of a stabilizer,
- (f) from 0 to about 5% by weight of a smoke suppressant additive, wherein the smoke suppressant composition comprises a combination of alumina trihydrate and magnesium hydroxide in proportions of 4:1 to 1:4, and said sealant composition exhibits a smoke index of less than 45.
Dependencies are inferred from the claim text.