Back to results
US 4,366,284 AGranted
Aqueously-swelling water stopper and a process of stopping water thereby
AssigneeHayakawa Rubber Company Limited
InventorsYoshinobu Ishido, Hideo Tanaka
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeHayakawa Rubber Company Limited
InventorsYoshinobu Ishido, Hideo Tanaka
Estimating the term…
The disclosed water stopper and water stopping process use an aqueously-swelling water-stopping composition consisting of 10 to 40 weight % of rubber whose main ingredient is reclaimed rubber, 10 to 20 weight % of silicic compound, 10 to 60 weight % of bentonite, and 10 to 40 weight % of plasticizer. The aforesaid water-stopping composition may be extruded into an elongated water stopper with or without a core therein, which water stopper can be inserted into a joint gap or other gap of structural members to stop water at the gap.
Aqueously-swelling water-stopping composition consisting of 10 to 40 weight % of rubber whose main ingredient is reclaimed rubber blended with less than 30 weight % of virgin rubber, 10 to 20 weight % of silicic compound, 10 to 60 weight % of bentonite, said silicic compound and bentonite acting as fillers and said silicic compound being selected from the group consisting of silicic acid anhydride, hydrous silicic acid, and calcium silicate, and 10 to 40 weight % of rubber plasticizer.
Aqueously-swelling water-stopping composition consisting of 10 to 40 weight % of reclaimed rubber;
An extruded water stopper made of aqueously-swelling water-stopping composition consisting of 10 to 40 weight % of rubber whose main ingredient is reclaimed rubber blended with less than 30 weight % of virgin rubber;
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
No related US applications are recorded in the indexed filing history.
Materials not provided for elsewhere: materials in mouldable or extrudable form for sealing or packing joints or covers
Sealings: of joints, e.g. expansion joints
Of joints, e.g. expansion joints: fillings therefor
Of joints, e.g. expansion joints: compressable seals of hollow form
Term ended 21 Jan 2001 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
This invention relates to a novel aqueously-swelling water stopper to be placed in a joint gap of structural members to fully fill up and close the joint gap for stopping water there. The invention also relates to a process of stopping water by using such water stopper.
More particularly, the invention relates to a water stopper having an outer resilient rubber layer made of aqueously-swelling water-stopping composition with a core having a high tensile strength, which rubber layer absorbs water and swells upon absorbing water to expand the volume thereof, and the invention also relates to a process of stopping water in architectural, civil engineering or other public structure (to be referred to as "building structure", hereinafter) by filling the aforementioned water stopper in a juncture gap or other gap of concrete or metallic structural member of the building structure, so that when water flows into the gap, the rubber layer swells to fully prevent water from seeping in or leaking out relative to the gap of the building structure.
For a better understanding of the invention, reference is made to the accompanying drawings, in which:
FIGS. 1 through 6 are schematic perspective views of water stoppers of the invention, which are formed by enclosing solid core members within aqueously-swelling water-stopping compostions;
FIGS. 7 through 10 are schematic perspective views of water stoppers of the invention, which are made by enclosing hollow core members with an aqueously-swelling water-stopping composition;
The aqueously-swelling water-stopping composition according to the present invention will be described at first, by referring to the nature, composition, production, and examples thereof.
The composition of the present invention uses three kinds of indispensable components; i.e., component (A) consisting of reclaimed rubber or a mixture of reclaimed rubber as main ingredient and a suitable amount of non-cross-linked virgin rubber, components (B) consisting of silicic compound and bentonite, and component (C) consisting of plasticizer.
As regards the component (A), the reclaimed rubber is reclaimed butyl rubber, reclaimed tire rubber, or the like; and the non-cross-linked virgin rubber is, for instance, natural rubber, styrene-butadiene copolymer rubber, ethylene-propylene-diene terpolymer rubber, isoprene rubber, acrylonitrile-butadiene copolymer rubber, acrylic rubber, ethylene-propylene rubber, chloroprene rubber, butyl rubber, or butyl halide rubber. Among the aforesaid non-cross-linked rubbers, the preferable rubbers are butyl rubber, butyl halide rubber, polyisobutylene, ethylene-propylene-diene terpolymer rubber, and partly-cross-linked butyl rubber. Any of the aforesaid rubbers may be used alone, or an arbitrary mixture of any two or more of them may be used in the present invention.