US4252918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brominated rubber
Assignee: JAPAN SYNTHETIC Co Ltd A CORP OF JAPAN
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Filing: 1979-05-30
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Granted: 1981-02-24
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Expires: 1999-05-30
Abstract
Abstract When an elastomeric copolymer of a C 4 or C 5 conjugated diene and an aromatic vinyl compound is brominated in latex while keeping the uniformity of the latex until the amount of bormine combined with the copolymer reaches 0.5-15% by weight, the resulting brominated conjugated diene-aromatic vinyl compound rubber contains 3-80% by weight of a toluene-insoluble fraction formed by the bromination and has a high green strength and a good processability. A vulcanized rubber obtained from said brominated rubber has a high modulus of elasticity and a high tensile strength. When an anionic surfactant is used as an emulsifier, the uniformity of the above-mentioned latex can be kept by adjusting the pH value of the bromination reaction system to 9 or highter, preferably 10 or higher, during the reaction or by auxiliarily adding a nonionic surfactant. When a cationic or nonionic surfactant is used as an emulsifier, regulation of pH is unnecessary.
Inventors
- 👤 Hiroharu Ikeda
- 👤 Yasuyuki Shimozato
- 👤 Kohei Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:00
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/12; C08C19/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
73 words
A brominated rubber containing 3-80% by weight of toluene-insoluble fraction which is obtained by brominating an elastomeric copolymer composed of 50% by weight or more of a C 4 or C 5 conjugated diene and 50% by weight or less of an aromatic vinyl compound in latex in the presence of a surfactant while keeping the uniformity of the latex until the amount of bromine combined with the rubber reaches 0.5-15% by weight.
Claim 2
Dependent Claim
73 words
A brominated rubber containing 3-80% by weight of toluene-insoluble fraction which is obtained by brominating an elastomeric copolymer composed of 50% by weight or more of a C 4 or C 5 conjugated diene and 50% by weight or less of an aromatic vinyl compound in latex in the presence of a surfactant while keeping the uniformity of the latex until the amount of bromine combined with the rubber reaches 0.5-15% by weight.
Claim 3
Dependent Claim
64 words
A brominated rubber according to claim 1, wherein said rubber latex contains an anionic surfactant as an emulsifier in a proportion of 0.5 to 15% by weight based on the weight of the rubber component, and the pH of the latex is maintained at 9 or more from the beginning of the bromination to its end, whereby the uniformity of the latex is maintained.
Claim 4
Dependent Claim
19 words
A brominated rubber according to claim 2, wherein the pH of the latex is maintained at 10 or more.
Claim 5
Dependent Claim
33 words
A brominated rubber according to claim 2, wherein the rubber latex additionally contains a nonionic surfactant in a proportion of 2 to 15% by weight based on the weight of the rubber component.
Claim 6
Dependent Claim
20 words
A brominated rubber according to claim 4, wherein the bromination is carried out at a pH value lower than 7.
Claim 7
Dependent Claim
56 words
A brominated rubber according to claim 2, 3, 4 or 5, wherein said anionic surfactant is an alkali metal salt of higher fatty acid, rosin acid, an alkali metal salt of disproportionated rosin acid, a tall oil soap, an alkali metal salt of sulfonic acid or a salt of a mono-sulfuric ester of a higher alcohol.
Claim 8
Dependent Claim
48 words
A brominated rubber according to claim 2, 3, 4 or 5, wherein said anionic surfactant is potassium oleate, sodium oleate, sodium stearate, rosin acid, sodium or potassium salt of disproportionated rosin acid, tall oil soap, potassium dodecylbenzenesulfonate, potassium ligninsulfonate or sodium salt of monosulfuric ester of oleyl alcohol.
Claim 9
Dependent Claim
22 words
A brominated rubber according to claim 2, 3, 4 or 5, wherein said anionic surfactant is potassium salt of disproportionated rosin acid.
Claim 10
Dependent Claim
30 words
A brominated rubber according to claim 4 or 5, wherein said nonionic surfactant is polyoxyethylene cetyl ether, polyoxyethylene lauryl ether, mono-(higher fatty acid) ester of pentaerythritol, or polyoxyethylene nonylphenyl ether.
Claim 11
Dependent Claim
39 words
A brominated rubber according to claim 1, wherein the rubber latex contains, as an emulsifier, 2 to 15% by weight of an nonionic surfactant based on the weight of the rubber component whereby the uniformity of latex is maintained.
Claim 12
Dependent Claim
19 words
A brominated rubber according to claim 10, wherein said nonionic surfactant is polyoxyethylene nonylphenyl ether, or polyoxyethylene oleyl ether.
Claim 13
Dependent Claim
39 words
A brominated rubber according to claim 1, wherein the rubber latex contains, as an emulsifier, 0.5 to 15% by weight of a cationic surfactant based on the weight of the rubber component whereby the uniformity of latex is maintained.
Claim 14
Dependent Claim
22 words
A brominated rubber according to claim 12, wherein said cationic surfactant is dodecyltrimethylammonium chloride, triethanolamine monostearate or pyridinium salt of N-methylol oleamide.
Claim 15
Dependent Claim
21 words
A brominated rubber according to claim 1, wherein said elastomeric copolymer is a copolymer of styrene and butadiene, isoprene or 1,3-pentadiene.
Claim 16
Dependent Claim
31 words
A brominated rubber according to claim 14, wherein said elastomeric copolymer is a copolymer composed of 60% by weight or more of butadiene and 40% by weight or less of styrene.
Claim 17
Dependent Claim
17 words
A brominated rubber according to claim 1, wherein said brominated rubber contains 1-10% by weight of bromine.
Claim 18
Dependent Claim
17 words
A rubber compound comprising the brominated rubber of claim 1, sulfur and additives conventionally incorporated into rubbers.
Claim 19
Dependent Claim
28 words
A rubber composition comprising the brominated rubber of claim 1 and natural rubber, polyisoprene rubber, polybutadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, isobutyleneisoprene rubber, or ethylene-propylene-diene rubber.
Claim 20
Dependent Claim
20 words
A rubber composition comprising the brominated rubber of claim 1 and natural rubber, polyisoprene rubber, polybutadiene rubber, or styrene-butadiene rubber.
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) | 1984-02-24 | 1984-08-25 | 1985-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-24 | 1988-08-25 | 1989-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-24 | 1992-08-25 | 1993-02-24 | $7700.00 | Window Closed / Lapsed |