| abstract |
The water-swellable elastomer composition comprising (A) an N-vinylcarboxylic acid amide crosslinked resin, (B) a water swellable urethane obtained by reacting a hydrophilic polyol with a polyisocyanate, and (C) an elastomer, may contain an acid, an alkali, or various salts. It has a stable swelling ratio with respect to the aqueous solution, seawater or cement water contained, so that it can be used for a long time as a leakage preventing material without deteriorating moisture barrier property. |