US4045380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular material
Assignee: Coal Industry Patents Ltd
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Filing: 1975-02-13
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Granted: 1977-08-30
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Expires: 1995-02-13
Abstract
Abstract A cellular material may be made by vulcanizing a mixture containing between 15% and 50% of an ebonite-forming rubber and sufficient vulcanizing agents to form an ebonite with the rubber, between 5% and 87% of a coal digested in pitch, tar or tar oil, between 10% and 40% of a particulate filler and a chemical blowing agent, whereby an ebonite structure is formed, so that, during the vulcanization, the chemical blowing agent decomposes or reacts to produce a gas, the viscosity of the composition during the production of the gas increasing whereby cells are retained in the composition. The digested coal has a penetration, converted to a Ring and Ball softening point of 85 DEG C, of between 10 and about 45. Cellular plastics material produced by this process may contain at least 25% by volume of closed cells.
Inventors
- 👤 Geoffrey Vincent Dallow Blunt
- 👤 Newton John Hodges
- 👤 Robert James Pragnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:40
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/04; C08J2321/00; C08J2395/00; C08J2421/00; C08J2495/00; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A process for the production of a cellular material by vulcanizing a mixture containing between 9 and 50% by weight of a mixture of a rubber together with vulcanizing agents to form an ebonite with the rubber, between 20% and 70 by weight of a coal digested in pitch, tar or tar oil, between 10% and 40% of a particular filler and a chemical blowing agent, whereby an ebonite structure is formed, so that, during the vulcanization, the chemical blowing agent decomposes or reacts to produce a gas, the viscosity of the composition during the production of the gas increasng whereby at least 25% by volume of closed cells are retained in the composition wherein the digested coal has a penetration converted to a Ring and Ball softening point of 85° C, of between 10 and about 45.
Claim 2
Dependent Claim
138 words
A process for the production of a cellular material by vulcanizing a mixture containing between 9 and 50% by weight of a mixture of a rubber together with vulcanizing agents to form an ebonite with the rubber, between 20% and 70 by weight of a coal digested in pitch, tar or tar oil, between 10% and 40% of a particular filler and a chemical blowing agent, whereby an ebonite structure is formed, so that, during the vulcanization, the chemical blowing agent decomposes or reacts to produce a gas, the viscosity of the composition during the production of the gas increasng whereby at least 25% by volume of closed cells are retained in the composition wherein the digested coal has a penetration converted to a Ring and Ball softening point of 85° C, of between 10 and about 45.
Claim 3
Dependent Claim
31 words
The process claimed in claim 1 in which the rubber is selected from natural rubber and synthetic rubbers, said synthetic rubber is being a homopolymer or copolymer of butadiene or isoprene.
Claim 4
Dependent Claim
22 words
The process claimed in claim 2 in which the synthetic rubber is a copolymer of butadiene or isoprene with acrylonitrile or styrene.
Claim 5
Dependent Claim
23 words
The process claimed in claim 2 in which the blowing agent is selected from sodium bicarbonate and ammonium bicarbonate and azo blowing agents.
Claim 6
Dependent Claim
31 words
The process claimed in claim 2 in which before being foamed the mixture is so mixed that all solids are dispersed and the bituminous material and the rubber are mutually dispersed.
Claim 7
Dependent Claim
36 words
The process claimed in claim 5 in which the mixture is introduced into the mould cavity of a closed mould, which mould is then heated whereby the blowing agent forms cells and the rubber is vulcanised.
Claim 8
Dependent Claim
30 words
The process claimed in claim 6 in which a cellular material is removed from the mould before complete vulcanisation and thereafter the vulcanisation is completed to form the ebonite structure.
Claim 9
Dependent Claim
77 words
A cellular plastics material containing between 20% and 70% by weight of coal digested in pitch, tar or tar oil, and between 9 and 50% by weight of an ebonite vulcanized rubber matrix and between 10% and 40% of a particulate filler and including at least 25% by volume of closed cells, in which the digested coal has a penetration, converted to a Ring and Ball softening point of 85° C, of between 10 and about 45.
Claim 10
Dependent Claim
77 words
A cellular plastics material containing between 20% and 70% by weight of coal digested in pitch, tar or tar oil, and between 9 and 50% by weight of an ebonite vulcanized rubber matrix and between 10% and 40% of a particulate filler and including at least 25% by volume of closed cells, in which the digested coal has a penetration, converted to a Ring and Ball softening point of 85° C, of between 10 and about 45.
Claim 11
Dependent Claim
34 words
The cellular plastics material claimed in claim 8 in which the ebonite matrix is derived from a natural rubber or a synthetic rubber, said synthetic rubber being homopolymer or copolymer of butadiene or isoprene.
Claim 12
Dependent Claim
16 words
The cellular plastics material claim in claim 9 including at least 60% by volume of cells.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |