| abstract |
PURPOSE: To obtain a water-absorbing material which does not deteriorate physical properties inherent in a substrate and out of which a highly water- absorbing high-molecular material does not drop, by coating or impregnating a substrate with a compsn. contg. rubber or a synthetic resin and a highly water-absorbing high-molecular material. n CONSTITUTION: A substrate is coated or impregnated with a liquid compsn. contg. rubber or a synthetic resin and a highly water-absorbing high-molecular material. As the highly water-absorbing high-molecular material, a compd. which is water-insoluble and absorb water in a quantity of 10W1000 times its own weight can be used. Examples of such materials are a hydrolyzate of a starch/acrylonitrile graft polymer and a saponified vinyl acetate/acrylate copolymer. As the synthetic resin, a compd. having such flexibility that its volume can be expanded by water absorption is preferred. When a rigid material is used, it is preferred to use a plasticizer to impart flexibility. n COPYRIGHT: (C)1986,JPO&Japio |