C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1128, 400/64
C08L 21/00 (2006.01) C08L 23/08 (2006.01) C08L 23/28 (2006.01) C08L 23/34 (2006.01) C08L 33/00 (2006.01) C08L 33/14 (2006.01) C08L 33/26 (2006.01) C09K 3/12 (2006.01)
Patent
CA 1327246
- 20 - ABSTRACT OF THE DISCLOSURE The water-swellable composition for water-leakage prevention useful in construction works is a compounded material comprising (A) 100 parts by weight of an elastomer such as a polychloroprene rubber and (B) 20 to 300 parts by weight of a highly water-absorptive resin which is a crosslinked material of a copolymer of a ternary monomeric mixture composed of (meth)acrylic acid, a compound of the formula CH2=CR-CO-O-?-CH2-?-?SO3X, R being H or methyl, X being H or a monovalent cation and n being an integer of at least 2, such as sodium 2-sulfoethyl acrylate, and (meth)acrylamide in a specified proportion. The crosslinks are formed either by reacting the copolymer with a crosslinking agent such as propylene glycol or by copolymerizing the monomers in the presence of a copolymer- izable crosslinking agent such as N,N-methylene bisacryl- amide. The composition is capable of exhibiting stable swelling pressure and strength even in water containing polyvalent metal ions, e.g., calcium ions.
553660
Takasaki Kazuhiro
Terauchi Michiyoshi
C.i. Kasei Co. Ltd.
Kirby Eades Gale Baker
Takasaki Kazuhiro
Terauchi Michiyoshi
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