| 摘要 |
PURPOSE:To provide the title compsn. having an excellent waterstopping effect and stable absorptivity of a polyvalent metal ion-contg. soln. such as hard water, seawater, etc., by blending an elastomer with a specified crosslinked copolymer as a highly water-absorbing resin. CONSTITUTION:An elastomer (A) such as natural rubber, synthetic rubber or a flexible synthetic resin (e.g., diene rubber or chlorinated PE) is blended with a highly water-absorbing resin (B) in an amount of 0.2-3 times by weight that of the component A. Said resin (B) is composed of a crosslinked copolymer obtd. by copolymerizing 40-90mol% of an acid monomer component (a) consisting of a monomer mixture of 2-4pts.wt. acrylic acid component composed of acrylic acid and/or methacrylic acid and 8-6pts.wt. (meth)acrylic ester having a sulfo group in the free form or in the form of a salt, represented by the formula (wherein R is H or CH3; X is H or a monovalent cation; and n is a number not smaller than 2) with 60-10mol% of an amide component (b) composed of (meth)acrylamide and crosslinking the resulting copolymer by using a crosslinking agent such as N,N-methylenebisacrylamide.
|
