US3734898A
Expired / Lapsed
US
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Process for the preparing of random copolymers of conjugated dienes and vinyl aromatic hydrocarbons
Assignee: JSR Corp
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Filing: 1971-04-05
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Granted: 1973-05-22
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Expires: 1991-04-05
Abstract
Abstract A process for copolymerization of a conjugated diolefin with a vinyl aromatic hydrocarbon by a lithium type initiator in the presence of a randomizer selected from anionic surface active compounds having a hydrophilic group represented by -SO3M or OSO3M where M is Na or K, in 1 - 20 parts by weight of a hydrocarbon or halogenated hydrocarbon solvent per 1 part by weight of the monomers, which comprises initiating the polymerization reaction at 20*C. - 90*C. and polymerizing substantially all monomers at the maximum temperature below 150*C. without removal of polymerization heat.
Inventors
- 👤 K Komatsu
- 👤 S Hayashi
- 👤 A Ohishi
- 👤 M Sakai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 05:33
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
20 words
The process of claim 1 wherein the conjugated diolefin is selected from the group consisting of 1,3-butadiene, isoprene and piperylene.
Claim 2
Dependent Claim
24 words
The process of claim 1 wherein the vinyl aromatic hydrocarbon is selected from the group consisting of styrene, divinylbenzene, alpha-methyl styrene and vinyl toluene.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the temperature at which the polymerization is initiated ranges from 40*C. - 70*C.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the solvent is selected from the group consisting of n-pentane, n-hexane, n-heptane, iso-octane, cyclohexane, benzene, toluene, xylene, chlorobenzene and dichlorobenzene.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein the solvent is used in an amount of 2 - 10 parts by weight per 1 part by weight of the monomers.
Claim 6
Dependent Claim
54 words
The process of claim 1 wherein the randomizer is selected from the group consisting of potassium stearylbenzene sulfonate, potassium dodecylbenzene sulfonate, potassium nonylbenzene sulfonate, potassium decylbenzene sulfonate, potassium stearyl sulfate, potassium dodecyl sulfate, potassium decyl sulfate, potassium nonyl sulfate, potassium N-methyl taurate, methylene bis(potassium naphthalene sulfonate) and sodium derivatives of the compounds mentioned above.
Claim 7
Dependent Claim
39 words
The process of claim 1 wherein the randomizer is used in an amount of 0.001 - 10 gram atoms calculated as the metal atom in the randomizer per 1 gram atom calculated as the lithium atom in the initiator.
Claim 8
Dependent Claim
32 words
The process of claim 1 wherein the lithium type initiator is selected from the group consisting of ethyl lithium, n-butyl lithium, sec-butyl lithium, tert.-butyl lithium, phenyl lithium, vinyl lithium, and teramethylene dilithium.
Claim 9
Dependent Claim
24 words
The process of claim 1 wherein the initiator is used in an amount of 0.02 - 2 millimoles per 100 grams of the monomers.
Claim 10
Dependent Claim
24 words
The process of claim 10 wherein the initiator is used in an amount of 0.05 - 1 millimole per 100 grams of the monomers.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |