US4121031A
Expired / Lapsed
US
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Process for producing random copolymers
Assignee: Individual
•
Filing: 1976-06-24
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Granted: 1978-10-17
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Expires: 1996-06-24
Abstract
Abstract Process for producing a completely random copolymer of a conjugated diene and a monovinyl substituted aromatic compound having the same composition as that of the starting monomeric mixture which comprises copolymerizing a conjugated diene and a monovinyl substituted aromatic compound in the presence of lithium catalyst in a polymerization medium at a temperature not higher than 150° C and at which the resulting copolymer is substantially phase-separated, said temperature being dependent upon the type of medium, and type, composition and concentration of the monomer used.
Inventors
- 👤 Saburo Minekawa
- 👤 Sigeru Yonekawa
- 👤 Haruro Tabata
- 👤 Takashi Ishida
- 👤 Satoshi Tsuchida
- 👤 Kiyoshi Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:41
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
152 words
In the process for producing a substantially random copolymer by contacting 1,3-butadiene and styrene in the presence of a catalyst consisting of an alkyllithium in a hydrocarbon solvent to form said copolymer, the improvement which comprises charging simultaneously to a reactor a reactor charge consisting of said butadiene, styrene and n-butyllithium catalyst, and n-hexane solvent, or charging simultaneously said butadiene, styrene and n-hexane solvent to n-butyllithium catalyst in a reactor, the concentration of styrene and butadiene being from about 25 to about 33 percent by weight, the styrene/butadiene ratio being from 1/10 to 4/10, and in the process maintaining the resulting reaction mixture at a temperature not higher than 150° C. and above about 100° C. when the styrene/butadiene ratio is 4/10 and above about 110° C. when the styrene/butadiene ratio is 1/10, at which temperature the viscous solution of the resulting copolymer separates from said reaction mixture to form a slurry.
Claim 2
Dependent Claim
152 words
In the process for producing a substantially random copolymer by contacting 1,3-butadiene and styrene in the presence of a catalyst consisting of an alkyllithium in a hydrocarbon solvent to form said copolymer, the improvement which comprises charging simultaneously to a reactor a reactor charge consisting of said butadiene, styrene and n-butyllithium catalyst, and n-hexane solvent, or charging simultaneously said butadiene, styrene and n-hexane solvent to n-butyllithium catalyst in a reactor, the concentration of styrene and butadiene being from about 25 to about 33 percent by weight, the styrene/butadiene ratio being from 1/10 to 4/10, and in the process maintaining the resulting reaction mixture at a temperature not higher than 150° C. and above about 100° C. when the styrene/butadiene ratio is 4/10 and above about 110° C. when the styrene/butadiene ratio is 1/10, at which temperature the viscous solution of the resulting copolymer separates from said reaction mixture to form a slurry.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein the resulting reaction mixture is maintained in the process at about 125° C.
Claim 4
Dependent Claim
26 words
The process of claim 1, wherein the ratio of styrene/butadiene is 1/4 and the resulting reaction mixture is maintained in the process at about 125° C.
Claim 5
Dependent Claim
25 words
The process of claim 1, wherein the ratio of styrene/butadiene is 1/4 and the resulting reaction mixture is maintained in the process at 150° C.
Claim 6
Dependent Claim
26 words
The process of claim 1, wherein the ratio of styrene/butadiene is 1/4 and the resulting reaction mixture is maintained in the process at about 130° C.
Claim 7
Dependent Claim
110 words
In the process for producing a substantially random copolymer by contacting 1,3-butadiene and styrene in the presence of a catalyst consisting of an alkyllithium in a hydrocarbon solvent to form said copolymer, the improvement which comprises charging simultaneously to a reactor a reactor charge consisting of said butadiene, styrene and cyclohexane solvent to n-butyllithium in a reactor, the concentration of styrene and butadiene being from about 25 to about 33 percent by weight, the styrene/butadiene ratio being about 1/4, and in the process maintaining the resulting reaction mixture at 150° C., at which temperature the viscous solution of the resulting copolymer separates from said reaction mixture to form a slurry.
Claim 8
Dependent Claim
110 words
In the process for producing a substantially random copolymer by contacting 1,3-butadiene and styrene in the presence of a catalyst consisting of an alkyllithium in a hydrocarbon solvent to form said copolymer, the improvement which comprises charging simultaneously to a reactor a reactor charge consisting of said butadiene, styrene and cyclohexane solvent to n-butyllithium in a reactor, the concentration of styrene and butadiene being from about 25 to about 33 percent by weight, the styrene/butadiene ratio being about 1/4, and in the process maintaining the resulting reaction mixture at 150° C., at which temperature the viscous solution of the resulting copolymer separates from said reaction mixture to form a slurry.
Claim 9
Dependent Claim
110 words
In the process for producing a substantially random copolymer by contacting 1,3-butadiene and styrene in the presence of a catalyst consisting of an alkyllithium in a hydrocarbon solvent to form said copolymer, the improvement which comprises charging simultaneously to a reactor a reactor charge consisting of said butadiene, styrene and n-butyllithium, and cyclohexane solvent, the styrene/butadiene ratio being from 1/10 to 4/10, the concentration of styrene and butadiene being from about 25 to about 33 percent by weight, and in the process maintaining the resulting reaction mixture at about 140° C., at which temperature the viscous solution of the resulting copolymer separates from said reaction mixture to form a slurry.
Claim 10
Dependent Claim
110 words
In the process for producing a substantially random copolymer by contacting 1,3-butadiene and styrene in the presence of a catalyst consisting of an alkyllithium in a hydrocarbon solvent to form said copolymer, the improvement which comprises charging simultaneously to a reactor a reactor charge consisting of said butadiene, styrene and n-butyllithium, and cyclohexane solvent, the styrene/butadiene ratio being from 1/10 to 4/10, the concentration of styrene and butadiene being from about 25 to about 33 percent by weight, and in the process maintaining the resulting reaction mixture at about 140° C., at which temperature the viscous solution of the resulting copolymer separates from said reaction mixture to form a slurry.
Claim 11
Dependent Claim
18 words
The process of claim 1, wherein the concentration of styrene and butadiene is about 25 percent by weight.
Claim 12
Dependent Claim
18 words
The process of claim 6, wherein the concentration of styrene and butadiene is about 25 percent by weight.
Claim 13
Dependent Claim
18 words
The process of claim 7, wherein the concentration of styrene and butadiene is about 25 percent by weight.
Claim 14
Dependent Claim
18 words
The process of claim 6, wherein the concentration of styrene and butadiene is about 33 percent by weight.
Claim 15
Dependent Claim
18 words
The process of claim 7, wherein the concentration of styrene and butadiene is about 33 percent by weight.
References Cited (Backward Citations)
US3558575A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-16 | 1982-04-17 | 1982-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-16 | 1986-04-17 | 1986-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-16 | 1990-04-17 | 1990-10-17 | $7700.00 | Window Closed / Lapsed |