Water-swellable composition and leakage preventing material therewith
AssigneesKurary Isoprene Chemical Co., Ltd., C. I. Kasei Co., Ltd.
InventorsYoshihiro Yoshioka, Hiroshi Harima, Motokazu Nishimura
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Abstract
The invention provides a novel water-swellable polymeric composition useful as a leakage-preventing material filling an interstice, for example, in a concrete body or at a pipe joint. The polymeric composition comprises (a) a hydrophilic or water-soluble polymer having carboxyl groups in the molecule, (b) a water-soluble epoxy compound having at least two epoxy groups per molecule and (c) a rubbery polymer as blended with the components (a) and (b) in the form of an aqueous dispersion, e.g. a rubber latex, having been dried and subjected to a heat treatment, preferably, as impregnating a fibrous core material.
Claims11
A water-swellable polymeric composition which comprises
- (a) a hydrophilic polymer having carboxyl groups in the molecule in the form of a free carboxylic acid or in the form of an alkali metal or ammonium salt,
- (b) a water-soluble epoxy compound having at least two epoxy groups in a molecule, and
- (c) an aqueous dispersion of a rubbery polymer having a glass transition temperature not higher than -30.degree. C., uniformly blended together and having been dried and heated for 30 to 300 minutes at a temperature in the range of 80.degree. to 110.degree. C.
A leakage-preventing material which comprises
- (a) a fibrous core material, and
- (b) a water-swellable polymeric composition comprising
- (i) a hydrophilic polymer having carboxyl groups in the molecule in the form of free carboxylic acid or in the form of an alkali metal or ammonium salt,
- (ii) a water-soluble epoxy compound having at least two epoxy groups in a molecule, and
- (iii) an aqueous dispersion of a rubbery polymer having a glass transition temperature not higher than -30.degree. C., uniformly blended together to form an aqueous blend, said fibrous core material being impregnated with the aqueous blend and subjected to drying and heat treatment.
A method for preventing leakage of water from and interstice which comprises filling or covering the interstice with a water-swellable polymeric composition comprising
- (a) a hydrophilic polymer having carboxylic groups in the molecule in the form of the free carboxylic acid or in the form of an alkali metal or ammonium salt,
- (b) a water-soluble epoxy compound having at least two epoxy groups in a molecule, and
- (c) an aqueous dispersion of a rubbery polymer having a glass transition temperature not higher than -30.degree. C., uniformly blended together and having been dried and subjected to a heat treatment.
Dependencies are inferred from the claim text.