Patent US2194294A successfully refreshed from Google Patents.
Patent US4367325A successfully refreshed from Google Patents.
US4367325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Styrene-butadiene random copolymer and process for the production thereof
Assignee: JSR Corp
•
Filing: 1981-04-15
•
Granted: 1983-01-04
•
Expires: 2001-04-15
Abstract
Abstract Styrene-butadiene random copolymers having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 150, and a styrene content of about 3 to 30% by weight. They are prepared by copolymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium initiator and a Lewis base and, if necessary, an anionic surface active agent containing --SO 3 M or --OSO 3 M (wherein M is Na, K, Rb or Cs) under temperature-raising conditions. They are rubber materials having low rolling resistance and high wet skid resistance.
Inventors
- 👤 Yasumasa Takeuchi
- 👤 Noboru Ohshima
- 👤 Mitsuhiko Sakakibara
- 👤 Funio Tsutsumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:47
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
47 words
A styrene-butadiene random copolymer having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 150, and a styrene content of 3 to 30% by weight.
Claim 2
Dependent Claim
47 words
A styrene-butadiene random copolymer having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 150, and a styrene content of 3 to 30% by weight.
Claim 3
Dependent Claim
18 words
A styrene-butadiene random copolymer as claimed in claim 1, wherein the average vinyl content is at least 75%.
Claim 4
Dependent Claim
24 words
A styrene-butadiene random copolymer as claimed in claim 1 or 2, wherein the breadth of the distribution of vinyl contents is at least 30%.
Claim 5
Dependent Claim
19 words
A styrene-butadiene random copolymer as claimed in claim 3, wherein the styrene content is 3 to 20% by weight.
Claim 6
Dependent Claim
20 words
A styrene-butadiene random copolymer as claimed in claim 4, wherein the Mooney viscosity (ML1+4, 100° C.) is 20 to 100.
Claim 7
Dependent Claim
112 words
A process for producing a styrene-butadiene random copolymer having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 150, and a styrene content of 3 to 30% by weight by copolymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium initiator, characterized by carrying out the copolymerization in the presence of a Lewis base or a combination of a Lewis base and an anionic surface active agent containing --SO 3 M or --OSO 3 M, wherein M is Na, K, Rb or Cs under temperature-raising conditions.
Claim 8
Dependent Claim
112 words
A process for producing a styrene-butadiene random copolymer having an average vinyl content of at least 70%, a breadth of the distribution of vinyl contents of at least 20%, a Mooney viscosity (ML 1+4 , 100° C.) of 10 to 150, and a styrene content of 3 to 30% by weight by copolymerizing styrene and butadiene in a hydrocarbon solvent in the presence of an organolithium initiator, characterized by carrying out the copolymerization in the presence of a Lewis base or a combination of a Lewis base and an anionic surface active agent containing --SO 3 M or --OSO 3 M, wherein M is Na, K, Rb or Cs under temperature-raising conditions.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 6, wherein the Lewis base is an ether or tertiary amine having a high Lewis basicity.
Claim 10
Dependent Claim
61 words
A process as claimed in claim 6 or 7, wherein the Lewis base is ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol dibutyl ether, triethylene glycol dimethyl ether, triethylene glycol diethyl ether, tetraethylene glycol dimethyl ether, tetrahydrofuran, 2-methoxytetrahydrofuran, 2-methoxymethyltetrahydrofuran, 2,5-dimethoxymethyltetrahydrofuran, dioxane, N,N,N',N'-tetramethylethylenediamine, N,N,N',N'-tetraethylethylenediamine, triethylenediamine, N-methylmorpholine or N-ethylmorpholine.
Claim 11
Dependent Claim
30 words
A process as claimed in claim 8, wherein the amount of the Lewis base used is 0.2 to 500 moles per gram atom of the lithium in the organolithium initiator.
Claim 12
Dependent Claim
36 words
A process as claimed in claim 9, wherein the anionic surface active agent is an alkylsulfonate, an amide-bound sulfonate, an ester-bound sulfonate, a sulfuric ester salt of a higher alcohol, or an ester-bound sulfuric ester salt.
Claim 13
Dependent Claim
37 words
A process as claimed in claim 10, wherein the amount of the anionic surface active agent used is 1.0 gram atom or less (alkali metal atom bais) per gram atom of the lithium in the organolithium initiator.
Claim 14
Dependent Claim
49 words
A process as claimed in claim 11, wherein the polymerization initiation temperature is from -20° C. to 50° C. and the difference between the polymerization initiation temperature and the maximum temperature in the course of the polymerization or at the end of the polymerization is at least 40° C.
Claim 15
Dependent Claim
16 words
A process as claimed in claim 12, wherein the maximum temperature is 130° C. or less.
Claim 16
Dependent Claim
19 words
A process as claimed in claim 13, wherein the hydrocarbon solvent is an alicyclic hydrocarbon or an aliphatic hydrocarbon.
Claim 17
Dependent Claim
29 words
A process as claimed in claim 14, wherein the amount of the hydrocarbon solvent used is 1 to 20 parts by weight per part by weight of the monomers.
References Cited (Backward Citations)
US2975160A
Cited
US3301840A
Cited
US3366611A
Cited
US3773732A
Cited
US4022959A
Cited
US3980625A
Cited
US3716495A
Cited
US4139690A
Cited
US4230841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-03 | 1986-07-05 | 1987-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-03 | 1990-07-05 | 1991-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-03 | 1994-07-05 | 1995-01-04 | $7700.00 | Window Closed / Lapsed |