US4010123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellular material
Assignee: Coal Industry Patents Ltd
•
Filing: 1975-02-13
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Granted: 1977-03-01
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Expires: 1995-02-13
Abstract
Abstract The invention comprises the production of a cellular material by vulcanizing a mixture containing between 10% and 90% of an ebonite-forming rubber and sufficient vulcanizing agents to form an ebonite with the rubber, not more than 10% of a solid filler preferably in the absence of such 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 wherein the mixture further contains between 5% and 87% of a bituminous material.
Inventors
- 👤 Geoffrey Vincent Dallow Blunt
- 👤 Newton John Hodges
- 👤 Robert James Pragnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:49
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
103 words
A process for the production of a cellular material by vulcanizing a mixture containing between 10% and 50% of a mixture of rubber together with sufficient vulcanizing agents to form an ebonite with the rubber, not more than 10% of a solid 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 procedure of the gas increasing whereby cells are retained in the composition wherein the mixture further contains between about 52% and 87% of a bituminous material.
Claim 2
Dependent Claim
103 words
A process for the production of a cellular material by vulcanizing a mixture containing between 10% and 50% of a mixture of rubber together with sufficient vulcanizing agents to form an ebonite with the rubber, not more than 10% of a solid 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 procedure of the gas increasing whereby cells are retained in the composition wherein the mixture further contains between about 52% and 87% of a bituminous material.
Claim 3
Dependent Claim
15 words
The process claimed in claim 1 in which the mixture foamed contains no added filler.
Claim 4
Dependent Claim
20 words
The process claimed in claim 1 in which the bituminous material is coal digested in pitch, tar or tar oil.
Claim 5
Dependent Claim
30 words
The process claimed in claim 2 in which the rubber is selected from natural rubber and synthetic rubbers, said synthetic rubber being a homopolymer or copolymer of butadiene or isoprene.
Claim 6
Dependent Claim
22 words
The process claimed in claim 4 in which the synthetic rubber is a copolymer of butadiene or isoprene with acrylonitrile or styrene.
Claim 7
Dependent Claim
31 words
The process claimed in claim 4 in which before being foamed the mixture is so mixed that any solids are dispersed and the bituminous material and the rubber are mutually dispersed.
Claim 8
Dependent Claim
41 words
A cellular plastics material containing between about 52% and 87% of a bituminous material, and between 10% and 50% of an ebonite matrix formed of rubber and a vulcanizing agent filler and including at least 25% by volume of closed cells.
Claim 9
Dependent Claim
41 words
A cellular plastics material containing between about 52% and 87% of a bituminous material, and between 10% and 50% of an ebonite matrix formed of rubber and a vulcanizing agent filler and including at least 25% by volume of closed cells.
Claim 10
Dependent Claim
22 words
The cellular plastics material claimed in claim 7 in which the bituminous material is coal digested in pitch, tar or tar oil.
Claim 11
Dependent Claim
35 words
The cellular plastics material claimed in claim 7 in which the ebonite matrix is derived from a natural rubber or a synthetic rubber, said synthetic rubber being a homopolymer or copolymer of butadiene or isoprene.
Claim 12
Dependent Claim
16 words
The cellular plastics material claimed 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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |