US3867333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Natural graphite-reinforced cyclized butadiene elastomers
Assignee: Individual
•
Filing: 1972-12-22
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Granted: 1975-02-18
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Expires: 1992-12-22
Abstract
Abstract Natural graphite-reinforced, cyclized butadiene elastomers are prepared by mixing a homopolymer or copolymer of butadiene and a monoolefinic monomer with natural graphite, curing this mixture with an organic peroxide or mononuclear quinone and thereafter cyclizing the cured mixture by heating at a temperature of 350*700*F. The natural graphite-reinforced, cyclized butadiene polymers are hard, infusible, thermoset materials which have outstanding physical properties, particularly modulii, and resistance to air oxidation, inorganic acids and other chemicals, and overall aging at elevated temperatures.
Inventors
- 👤 Byron M Vanderbilt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:55
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/10; C08K; C08K3/00; C08K3/02; C08K3/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
A HIGH MODULUS COMPOSITE PREPARED BY THE CYCLIZATION UNDER NON-OXIDIZING CONDITIONS, OF A SUBSTANTIALLY EMULSIFIERFREE ELASTOMER CHOSEN FROM POLYBUTADIENE AND COPOLYMERS OF BUTADIENE WITH ACRYLONITRILE OR STYRENE, AND HAVING AT LEAST 10 PERCENT 1,2-TYPE UNSATURATION BEFORE CYCLIZATION, AND CONTAINING 100-800 PARTS BY WEIGHT OF NATURAL GRAPHITE OF AT LEAST 85 PERCENT PURITY PER 100 PARTS OF ELASTOMER, SAID COMPOSITE BEING CURED WITH AN ORGANIC PEROXIDE OR QUINONE PRIOR TO CYCLIZATION.
Claim 2
Dependent Claim
70 words
A HIGH MODULUS COMPOSITE PREPARED BY THE CYCLIZATION UNDER NON-OXIDIZING CONDITIONS, OF A SUBSTANTIALLY EMULSIFIERFREE ELASTOMER CHOSEN FROM POLYBUTADIENE AND COPOLYMERS OF BUTADIENE WITH ACRYLONITRILE OR STYRENE, AND HAVING AT LEAST 10 PERCENT 1,2-TYPE UNSATURATION BEFORE CYCLIZATION, AND CONTAINING 100-800 PARTS BY WEIGHT OF NATURAL GRAPHITE OF AT LEAST 85 PERCENT PURITY PER 100 PARTS OF ELASTOMER, SAID COMPOSITE BEING CURED WITH AN ORGANIC PEROXIDE OR QUINONE PRIOR TO CYCLIZATION.
Claim 3
Dependent Claim
17 words
The composite of claim 1 having tensile and flexural modulii exceeding one million pounds per square inch.
Claim 4
Dependent Claim
15 words
The composite of claim 1 wherein the elastomer is a copolymer of butadiene and acrylonitrile.
Claim 5
Dependent Claim
15 words
The composite of claim 1 wherein the elastomer is a copolymer of butadiene and styrene.
Claim 6
Dependent Claim
22 words
The composite of claim 1 wherein the graphite consists of the natural flake or crystalline grade of at least 98 percent purity.
Claim 7
Dependent Claim
35 words
The composite of claim 1 wherein the graphite used is of mine-run grade of at least 85 percent purity which has been pretreated to remove water of crystallization therefrom prior to mixing with the elastomer.
Claim 8
Dependent Claim
13 words
The composite of claim 1 wherein the elastomer is prepared by emulsion polymerization.
Claim 9
Dependent Claim
23 words
The composite of claim 2 wherein the graphite powder is of such fineness that at least 90 percent passes through a 200-mesh screen.
References Cited (Backward Citations)
US2625523A
Cited
US3274148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |