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AssigneesKuraray Isoprene Chemical Co. Ltd., C. I. Kasei Co., Ltd.
InventorsHiroshi Harima, Yoshihiro Yoshioka, Toshihiro Kimura, Kazuhiro Takasaki
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The invention provides a novel water-swellable caulking material which is a composite body of stratified structure composed of at least one rubbery layer swellable in water comprising highly water absorbing resin dispersed in the matrix of a rubber and at least one rubbery layer not swellable in water integrally bonded together, which latter serves to resist the expansion of the former layer when swollen in water in the directions other than the direction perpendicular to the plane of the layers. The inventive caulking material can exhibit unexpectedly excellent water sealing effect with easiness in handling in addition to the rapidity in water absorption by virtue of the structure thereof preventing the expansion of the material in the directions of length and width without decreasing the expansion in the direction of thickness.
A water-swellable caulking material of a composite body of stratified structure comprising at least one water-swellable rubbery layer containing a highly water absorbing resin dispersed in the matrix of a rubber and at least one rubbery layer not swellable in water integrally bonded together, the latter non-swellable rubbery layer serving to resist the expansion of the former water-swellable rubber layer in the directions other than the direction perpendicular to the plane of the layers when swollen in water.
Dependencies are inferred from the claim text.