Patent US4061825A successfully refreshed from Google Patents.
US4061825A
Expired / Lapsed
US
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Water activatable tapes
Assignee: Evode Ltd
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Filing: 1976-12-06
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Granted: 1977-12-06
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Expires: 1996-12-06
Abstract
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.
Inventors
- 👤 Patrick James Claude Counsell
- 👤 Sydney Robert Whitehouse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:53
CPC Classifications
C; C09; C09J; C09J7/00; C09J7/20; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249994; Y10T428/28; Y10T428/2852; Y10T428/2865; Y10T428/287; Y10T428/2878; Y10T428/2883; Y10T428/2896; Y10T442/00; Y10T442/20; Y10T442/2484
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
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.
Claim 2
Dependent Claim
87 words
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.
Claim 3
Dependent Claim
22 words
A tape according to claim 1 in which the cement is Portland cement or a mixture thereof with a filler or diluent.
Claim 4
Dependent Claim
47 words
A tape according to claim 1 in which the polymeric binder is an elastomeric polymer selected from styrene-butadiene rubbers, nitrile rubbers, polyurethane rubbers, polychloroprene rubbers, natural rubbers, epichlorhydrin rubbers, synthetic polyisoprenes, chlorinated polyisoprenes, polyisobutylenes, polybutadienes, butyl and chlorosulfonated polyethylene elastomers and chlorinated natural rubber and blends thereof.
Claim 5
Dependent Claim
26 words
A tape according to claim 3 in which the water-sensitive additive is a film-forming material capable of enhancing the adhesion of the tape to a surface.
Claim 6
Dependent Claim
14 words
A tape according to claim 4 in which the additive is a cellulose derivative.
Claim 7
Dependent Claim
69 words
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.
Claim 8
Dependent Claim
69 words
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.
Claim 9
Dependent Claim
20 words
A tape according to claim 6 in which the slurry has a solids content between 10 and 98% by weight.
Claim 10
Dependent Claim
17 words
A tape according to claim 6 in which the polymeric binder is a natural or synthetic rubber.
Claim 11
Dependent Claim
33 words
A tape according to claim 6 in which the additive is methyl cellulose, hydroxy propyl cellulose, sodium carboxy methyl cellulose, methyl hydroxy ethyl cellulose, hydroxy ethyl cellulose, polyvinyl pyrrolidone or a polyvinyl alcohol.
Claim 12
Dependent Claim
32 words
A tape according to claim 6 which is impregnated or coated with the cementitious composition in an amount of from 0.2 to 10 kgs per square meter, calculated on a dry basis.
Claim 13
Dependent Claim
49 words
A tape according to claim 6 in which the fabric is impregnated or coated with a cementitious composition comprising 50 to 150 parts by weight of a cement, 1 to 20 parts by weight of a cellulose either and 0.5 to 10 parts by weight of a synthetic rubber.
Claim 14
Dependent Claim
17 words
A tape according to claim 6 in which the slurry contains a polyvinyl alkyl ether tackifying agent.
Claim 15
Dependent Claim
85 words
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.
Claim 16
Dependent Claim
85 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |