초록

There is provided a polymer useful as a water absorbing agent. The polymer preferably contains the reaction product of an olefinically-unsaturated carboxylic acid, an alkyl acrylate and minor amounts of a crosslinking agent all in specified proportions.

대표청구항 ▼

In an absorbent dressing comprising an absorbent layer containing a water-swellable, water-insoluble material, the improvement which comprises having at least a portion of the water-swellable, water-insoluble material being an alkaline salt of a polymer prepared by the reaction of (a) from about 15%

In an absorbent dressing comprising an absorbent layer containing a water-swellable, water-insoluble material, the improvement which comprises having at least a portion of the water-swellable, water-insoluble material being an alkaline salt of a polymer prepared by the reaction of (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 carboxyl 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; and having the formula: [Figure] wherein: x represents the relative number of alkyl acrylate groups with R being 1 to 6 carbon atoms as component (b); y represents the relative number of olefinically-unsaturated carboxylic acid groups with R′being the hydrocarbon portion of the carboxylic acid compounds of component (a); z represents the relative number of crosslinking agents of component (c) with R″being hydrogen or methyl and R″′comprising the remaining portion of component (c).