Aqueously-swelling water stopper and a process for stopping water thereby
AssigneeHayakawa Rubber Company Limited
InventorsHajime Yamaji, Takeshi Kobayashi
Life of this patent
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Abstract
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 polyisobutylene, 10 to 20 weight % of silicate, 10 to 60 weight % of bentonite, said silicate and bentonite acting as fillers, 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 in a joint gap or other gap of structural members to stop water at the gap.
Claims17
An aqueously-swelling water-stopping composition consisting of:
- 10 to 40 weight % of rubber whose main ingredient is polyisobutylene having a molecular weight of from 70,000 to 130,000, 10 to 20 weight % of at least one silicate selected from the group consisting of silicic acid anhydride, hydrous silicic acid and calcium silicate, 10 to 60 weight % of bentonite, said silicate and bentonite acting as fillers, and 10 to 40 weight % of a plasticizer selected from the group consisting of paraffinic mineral oils, naphthenic mineral oils, aromatic mineral oils, stearic acid, palmitic acid, calcium stearate, castor oil, cotton seed oil, rapeseed oil, paraffin, paraffin chloride, dioctyl phthalate, dioctyl adipate, dibutyl sebacate, tricresyl phosphate, liquid chloroprene, liquid polyisobutylene, liquid polybutadiene, liquid polyisoprene and liquid polybutene.
An extruded water stopper made of an aqueously-swelling water-stopping composition consisting of:
- 10 to 40 weight % of rubber whose main ingredient is polyisobutylene having a molecular weight of from 70,000 to 130,000, 10 to 20 weight % of at least one silicate selected from the group consisting of silicic acid anhydride, hydrous silicic acid and calcium silicate, 10 to 60 weight % of bentonite, said silicate and bentonite acting as fillers, and 10 to 40 weight % of a plasticizer selected from the group consisting of paraffinic mineral oils, naphthenic mineral oils, aromatic mineral oils, stearic acid, palmitic acid, calcium stearate, castor oil, cotton seed oil, rapeseed oil, paraffin, paraffin chloride, dioctyl phthalate, dioctyl adipate, dibutyl sebacate, tricresyl phosphate, liquid chloroprene, liquid polyisobutylene, liquid polybutadiene, liquid polyisoprene and liquid polybutene.
A water stopper comprising an elongated core member with a high tensile strength, and at least one layer of an aqueously-swelling water-stopping composition secured to the outer surface of said core member, said aqueously-swelling water-stopping composition consisting of:
- 10 to 40 weight % of rubber whose main ingredient is polyisobutylene having a molecular weight of from 70,000 to 130,000, 10 to 20 weight % of at least one silicate selected from the group consisting of silicic acid anhydride, hydrous silicic acid and calcium silicate, 10 to 60 weight % of bentonite, and 10 to 40 weight % of a plasticizer selected from the group consisting of paraffinic mineral oils, naphthenic mineral oils, aromatic mineral oils, stearic acid, palmitic acid, calcium stearate, castor oil, cotton seed oil, rapeseed oil, paraffin, paraffin chloride, dioctyl phthalate, dioctyl adipate, dibutyl sebacate, tricresyl phosphate, liquid chloroprene, liquid polyisobutylene, liquid polybutadiene, liquid polyisoprene and liquid polybutene.
A process of stopping water at a gap in a building structure, comprising the steps of forming a water stopper by enclosing an elongated core member having a high tensile strength with a layer of an aqueously-swelling water-stopping composition consisting of:
- 10 to 40 weight % of rubber whose main ingredient is polyisobutylene having a molecular weight of from 70,000 to 130,000, 10 to 20 weight % of at least one silicate selected from the group consisting of silicic acid anhydride, hydrous silicic acid and calcium silicate, 10 to 60 weight % of bentonite, and 10 to 40 weight % of a plasticizer selected from the group consisting of paraffinic mineral oils, naphthenic mineral oils, aromatic mineral oils, stearic acid, palmitic acid, calcium stearate, castor oil, cotton seed oil, rapeseed oil, paraffin, paraffin chloride, dioctyl phthalate, dioctyl adipate, dibutyl sebacate, tricresyl phosphate, liquid chloroprene, liquid polyisobutylene, liquid polybutadiene, liquid polyisoprene and liquid polybutene;
- and placing the water stopper in the gap of the building structure, whereby the water stopper swells by absorbing water from the outside thereof so as to fill up that portion of the gap where said water stopper is placed.
Dependencies are inferred from the claim text.