US4080350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damp proof compositions
Assignee: Coal Industry Patents Ltd
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Filing: 1976-11-01
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Granted: 1978-03-21
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Expires: 1996-11-01
Abstract
Abstract The invention discloses a novel damp proof composition, suitable for making into sheets for roofing purposes, comprising (a) from 5 to 40% of a polychloroprene rubber, (b) pitch in an amount of up to 45%, and (c) at least 5% of a filler. The filler may be particulate or fibrous, and the composition may further include a supplementary polymer, for instance a nitrile rubber.
Inventors
- 👤 Murray George Briscoe
- 👤 Ronald Sidebottom
- 👤 John Edwin Latham Smith
- 👤 David Brian George
- 👤 David Watkin Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:48
CPC Classifications
C; C08; C08L; C08L95/00; C08K; C08K3/00; C08K3/02; C08K3/04; C08L11/00; C08L23/00; C08L23/26; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L23/28; C08L23/286; C08L9/00; C08L9/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
117 words
A damp proof composition in sheet form, consisting essentially of (a) from 5 to 40% of a polychloroprene rubber having a medium Mooney viscosity and a slow rate of crystalization, (b) from 10 to 45% of a coal tar pitch having a softening point of between 100° and 110° C, (c) from 5 to 12% of a fibrous filler, (d) from 5 to 60% of a particulate filler, (e) from 10 to 65% of one or more supplementary polymers selected from the group consisting of nitrile or halobutyl rubbers or styrene-butadiene copolymer rubbers, ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorosulphonated polyethylene or polyvinyl chloride homo- or co-polymers, and (f) processing aids in an amount of 1 to 5%.
Claim 2
Dependent Claim
117 words
A damp proof composition in sheet form, consisting essentially of (a) from 5 to 40% of a polychloroprene rubber having a medium Mooney viscosity and a slow rate of crystalization, (b) from 10 to 45% of a coal tar pitch having a softening point of between 100° and 110° C, (c) from 5 to 12% of a fibrous filler, (d) from 5 to 60% of a particulate filler, (e) from 10 to 65% of one or more supplementary polymers selected from the group consisting of nitrile or halobutyl rubbers or styrene-butadiene copolymer rubbers, ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorosulphonated polyethylene or polyvinyl chloride homo- or co-polymers, and (f) processing aids in an amount of 1 to 5%.
Claim 3
Dependent Claim
24 words
A composition as claimed in claim 1, wherein the particulate filler comprises up to 25% by weight of the total composition of carbon black.
Claim 4
Dependent Claim
37 words
A composition as claimed in claim 1, wherein the supplementary polymer comprises from 5 to 20% of nitrile rubber and up to 45% of one or more other of said polymers, by weight of the total composition.
Claim 5
Dependent Claim
39 words
A composition as claimed in claim 3, wherein the supplementary polymer comprises from 5 to 20% of nitrile rubber and about 7 to about 10% of one or more other of said polymers, by weight of the total composition.
Claim 6
Dependent Claim
25 words
A composition as claimed in claim 1, wherein the pitch is present in an amount of 10 to 35% by weight of the total composition.
References Cited (Backward Citations)
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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) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |