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US 4,308,416 AGranted
Water-tight electric cable
AssigneeNL Industries, Inc.
InventorsDaniel F. Herman, Uno Kruse
Life of this patent
Estimating the term…
Abstract
Insulated electrical devices protected against entry and migration of water, said electrical devices containing solid water-swellable, water-insoluble polymers prepared by crosslinking an olefinically-unsaturated carboxylic acid with an alkyl acrylate.
Claims3
An electric cable having a core of a plurality of insulated conductors and a jacket, the area between the conductors and within the jacket being at least partially filled with a particulate water-swellable, water-insoluble polymer which comprises:
- (a) from about 15% to about 50% by weight of an olefinically-unsaturated carboxylic acid containing an activated carbon-to-carbon olefinic double bond and at least one carboxy group;
- (b) from about 49.07% to about 82% by weight of an alkyl acrylate wherein the alkyl group has from 1 to 6 carbon atoms;
- and
- (c) from about 0.03% to about 3.0% by weight of a crosslinking agent which are polyunsaturated polymerizable vinyl monomers containing two or more free radical polymerizable ethylenic groups, said crosslinking agent being introduced directly into the carbon-carbon backbone of the polymer.
1 more element
Dependencies are inferred from the claim text.