Patent US4284681A successfully refreshed from Google Patents.
US4284681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite sheet material
Assignee: Dycem Ltd
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Filing: 1979-06-26
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Granted: 1981-08-18
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Expires: 1999-06-26
Abstract
Abstract A composite material comprising a layer of highly-plasticised polyvinylchloride, comprising 15 to 45% of polyvinylchloride and 55 to 85% by weight of a plasticiser, a fibrous backing, and an intermediate layer of a polymeric material between the polyvinylchloride layer and the backing, which material at least reduces the migration of plasticiser from the highly-plasticised polyvinylchloride layer to or through the backing. This material can be bonded using an adhesive to the walls, floor, and/or ceiling of a room which is to be kept free of dust and/or bacteria, e.g. an operating theatre or computer room. The dust and/or bacteria adhere to the exposed surface of the highly plasticised PVC layer, from which they can be removed by washing. The highly plasticised PVC layer also has valuable anti-slip properties.
Inventors
- 👤 James N. Tidmarsh
- 👤 Gerald N. Swift
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:20
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/18; B32B27/22; B32B27/06; B32B27/08; B32B27/12; B32B27/30; B32B27/304; B32B2307/00; B32B2307/70; B32B2307/744; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928; Y10T428/31935; Y10T442/00; Y10T442/20; Y10T442/2344; Y10T442/2525
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
A composite material comprising a layer of highly-plasticised polyvinylchloride, comprising 15 to 45% of polyvinylchloride and 55 to 85% by weight of a plasticiser, a fibrous backing, and an intermediate barrier layer of a non-foamed polymeric material between the highly-plasticised polyvinylchloride layer and the backing and bonded to both, which material acts as a barrier to the migration of plasticiser from the highly-plasticised polyvinylchloride layer to or through the backing.
Claim 2
Dependent Claim
70 words
A composite material comprising a layer of highly-plasticised polyvinylchloride, comprising 15 to 45% of polyvinylchloride and 55 to 85% by weight of a plasticiser, a fibrous backing, and an intermediate barrier layer of a non-foamed polymeric material between the highly-plasticised polyvinylchloride layer and the backing and bonded to both, which material acts as a barrier to the migration of plasticiser from the highly-plasticised polyvinylchloride layer to or through the backing.
Claim 3
Dependent Claim
18 words
A composite material according to claim 1, wherein the highly-plasticised polyvinylcholoride layer contains a modifier of rheological properties.
Claim 4
Dependent Claim
35 words
A composite material according to claim 2 wherein as a modifier of rheological properties the highly-plasticised polyvinylchloride layer contains 0.5 to 7 parts by weight of finely divided silica, per 100 parts of highly-plasticised PVC.
Claim 5
Dependent Claim
24 words
A composite material according to claim 1, wherein the backing comprises a fibrous material selected from knitted, woven and non-woven, synthetic and natural fibres.
Claim 6
Dependent Claim
31 words
A composite material according to claim 4, wherein the backing comprises a material selected from a spun bonded or melded thermoplastics material, or cotton, nylon, jute, hessian, polyester, and polyolefin fibres.
Claim 7
Dependent Claim
41 words
A composite material according to claim 1 wherein the intermediate layer comprises a polymeric material selected from polyvinylchloride containing a lower proportion of plasticiser than is contained in the highly-plasticised polyvinylchloride layer, and a polyurethane, polychloroprene, and a modified olefin polymer.
Claim 8
Dependent Claim
23 words
A composite material according to claim 1, wherein the plasticiser in the highly-plasticised polyvinylchloride layer has a molecular weight in the range 750-1250.
Claim 9
Dependent Claim
41 words
A method of protecting a room or other enclosure from pollution by dust and/or bacteria, by bonding the composite material of claim 1 to one or more surfaces selected from the floor, ceiling and walls of the enclosure, using an adhesive.
Claim 10
Dependent Claim
126 words
A composite sheet material comprising bonded together in sequence: (1) a top layer of highly-plasticised polyvinylchloride, comprising 15 to 45% by weight of polyvinylchloride and 55 to 85% by weight of a plasticiser, wherein the plasticiser has a molecular weight in the range of about 750 to about 1250; (2) an intermediate barrier layer between the highly-plasticised polyvinylchloride layer and the underlying backing layer, wherein the intermediate layer consists essentially of a non-foamed polymeric material selected from polyvinylchloride containing a lower proportion of plasticiser than is contained in the highly-plasticised polyvinylchloride layer, a polyurethane, polychloroprene and a modified olefin polymer, the intermediate layer providing a barrier to the migration of plasticiser from the highly-plasticised polyvinylchloride layer to or through the backing; and (3) a fibrous backing.
Claim 11
Dependent Claim
126 words
A composite sheet material comprising bonded together in sequence: (1) a top layer of highly-plasticised polyvinylchloride, comprising 15 to 45% by weight of polyvinylchloride and 55 to 85% by weight of a plasticiser, wherein the plasticiser has a molecular weight in the range of about 750 to about 1250; (2) an intermediate barrier layer between the highly-plasticised polyvinylchloride layer and the underlying backing layer, wherein the intermediate layer consists essentially of a non-foamed polymeric material selected from polyvinylchloride containing a lower proportion of plasticiser than is contained in the highly-plasticised polyvinylchloride layer, a polyurethane, polychloroprene and a modified olefin polymer, the intermediate layer providing a barrier to the migration of plasticiser from the highly-plasticised polyvinylchloride layer to or through the backing; and (3) a fibrous backing.
References Cited (Backward Citations)
US4104430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |