Water activatable tapes
AssigneeEvode Holdings Limited
InventorsPatrick James Claude Counsell, Sydney Robert Whitehouse
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Abstract
Water-activatible tapes are disclosed comprising a substrate of fibrous or foamed plastics material impregnated or coated with a water-reactive cementitious composition which is reactive with water to form a set mass, the composition containing at least one cement, especially Portland cement, a non-water sensitive polymeric binder, such as a natural or synthetic rubber, and a water-sensitive additive which is compatible with the polymeric binder and is sufficiently water-sensitive to at least swell in contact with water. The tapes are suitable for construction purposes, e.g. sealing joints in buildings or pipe-wrapping, by wetting with water to form a pliable mass which can be deformed to the desired shape and which will subsequently harden.
Claims13
A water-activatible tape for construction purposes which comprises a substrate of fibrous or foamed plastics material impregnated or coated with a water-reactive cementitious composition which is reactive with water to form a set mass, said cementitious composition including at least one cement and a non-water sensitive polymeric binder which binds the cement to the substrate while the tape is in its uncured state and a water-sensitive additive which is compatible with the polymeric binder and which is sufficiently water-sensitive to at least swell in contact with water.
A water-activatible tape which comprises a woven or non-woven fabric which has been impregnated or coated with a non-aqueous cementitious slurry comprising a cement, a non-water-sensitive polymeric binder, an organic solvent for said binder and a water swellable or water-soluble additive dissolved or dispersed in the organic solvent and which has been dried to remove the solvent, said tape being reactive with water to form a hard, cured mass.
A water-activatible tape for construction purposes which comprises a fabric web coated and impregnated with a cementitious composition, said composition comprising at least one cement, an elastomeric polymer binder and a film-forming water-sensitive additive which is compatible with the binder and is swellable or soluble in water, said binder and said additive effectively binding the cement to the fabric while the tape is dry and said binder being effective to substantially prevent the cement being washed off the tape with water when activating the tape.
Dependencies are inferred from the claim text.