Patent ID: 6358580
Filing Date: 2002-03-19
Classification: C08L,C09K,Y10T

Abstract:
A water-swellable seal composition for preformed seals comprising: a matrix of an elastomer component and embedded particulate water-absorbent material which water-absorbent material is the combination of;(a) a polysaccharide selected from the group consisting of microcrystalline cellulose, amorphous cellulose, starch, starch derivatives except grafted starch, amylose, amylopectin, dextrans, pectins, insulin, chitin, xanthan, alginic acid, alginates, carragheenan, pustulan, callose, laminarin, guluronic acid, pullulan, lichenin and mixtures thereof; with (b) a water-superabsorbent synthetic polymer selected from the group consisting of polymers based on (meth)acrylate, poly(meth)-acrylic acid and salts thereof, polyacrylamide, polyalcohols, copolymers thereof, and mixtures thereof; wherein the seal composition is foamed by means of a blowing agent and heated to 100Â° C. or higher and whereupon the elastomer component is crosslinked.