US3887535A
Expired / Lapsed
US
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Process for producing rubbery conjugated diolefin polymers having branched structures
Assignee: Asahi Kasei Corp
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Filing: 1972-05-08
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Granted: 1975-06-03
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Expires: 1992-05-08
Abstract
Abstract A unique polymerization process for producing rubbery polymers having excellent physical properties and processability and freed from a cold flow property at normal temperature. The process, which might be called ''''Hightemperature instantaneous-continuous polymerization process,'''' comprises bringing a mixture of conjugated diolefin having from 4 to 5 carbon atoms per molecule and a metallic lithium or an alkyllithium catalyst continuously into a reaction zone maintained at a temperature of from about 90* to 235*C. to give a polymer having a desired degree of branching from which the desirable properties mentioned above are derived.
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
2026-10-25 03:51
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
PROCESS FOR PRODUCING A RUBBERY POLYMER HAVING A BRANCHED STRUCTURE, WHICH COMPRISES BRINGING CONTINUOUSLY INTO A POLYMERIZATION ZONE A MIXTURE CONSISTING OF A CONJUATED DIOLEFIN HAVING FROM 4 TO 5 CARBON ATOMS PER MOLECULE AND SELECTED FROM THE GROUP CONSISTING OF 1,3-BUTADIENE, 2-METHYL-1,3-BUTADIENE AND 1,3-PENTADIENE, A HYDROCARBON DILUENT SELECTED FROM THE GROUP CONSISTING OF A PARAFFINIC, CCYCLOPARAFFINIC AND AROMATIC HYDROCARBON HAVING FROM 5 TO 12 CARBON ATOMS PER MOLECULE AND A C2-C8 ALKYLLITHIUM CATALYST AND AT A PREDETERMINED TEMPERATURE OF FROM ABOUT 90* TO ABOUT 235*C. TO INITIATE POLYMERIZATION OF SAID DIOLEFIN THEREIN, AND CONTINUING THE POLYMERIZATION OF SAID CONJUGATED DIOLEFIN WHILE MAINTAINING THE POLYMERIZATION THEMPERATURE WITHIN SAID SPECIFIED RANGE OF FROM ABOUT 90* TO ABOUT 235*C. WITH A CONTINUOUS ADDITION OF SAID CONJUGATED DIOLEFIN, SAID HYDROCARBON DILUENT AND SAID CATALYST TO FORM SAID RUBBERY POLYMER, THE INITIATION AND CONTINUATION OF SAID POLYMERIZATION BEING CARRIED OUT UNDER POLYMERIZATION CONDITIONS IN WHICH KI IS GREATER THAN KP.
Claim 2
Dependent Claim
156 words
PROCESS FOR PRODUCING A RUBBERY POLYMER HAVING A BRANCHED STRUCTURE, WHICH COMPRISES BRINGING CONTINUOUSLY INTO A POLYMERIZATION ZONE A MIXTURE CONSISTING OF A CONJUATED DIOLEFIN HAVING FROM 4 TO 5 CARBON ATOMS PER MOLECULE AND SELECTED FROM THE GROUP CONSISTING OF 1,3-BUTADIENE, 2-METHYL-1,3-BUTADIENE AND 1,3-PENTADIENE, A HYDROCARBON DILUENT SELECTED FROM THE GROUP CONSISTING OF A PARAFFINIC, CCYCLOPARAFFINIC AND AROMATIC HYDROCARBON HAVING FROM 5 TO 12 CARBON ATOMS PER MOLECULE AND A C2-C8 ALKYLLITHIUM CATALYST AND AT A PREDETERMINED TEMPERATURE OF FROM ABOUT 90* TO ABOUT 235*C. TO INITIATE POLYMERIZATION OF SAID DIOLEFIN THEREIN, AND CONTINUING THE POLYMERIZATION OF SAID CONJUGATED DIOLEFIN WHILE MAINTAINING THE POLYMERIZATION THEMPERATURE WITHIN SAID SPECIFIED RANGE OF FROM ABOUT 90* TO ABOUT 235*C. WITH A CONTINUOUS ADDITION OF SAID CONJUGATED DIOLEFIN, SAID HYDROCARBON DILUENT AND SAID CATALYST TO FORM SAID RUBBERY POLYMER, THE INITIATION AND CONTINUATION OF SAID POLYMERIZATION BEING CARRIED OUT UNDER POLYMERIZATION CONDITIONS IN WHICH KI IS GREATER THAN KP.
Claim 3
Dependent Claim
157 words
Process for producing a rubbery polymer having a branched structure, which comprises bringing continuously into a polymerization zone a mixture consisting of a conjugated diolefin having from 4 to 5 carbon atoms per molecule and selected from the group consisting of 1, 3-butadiene, 2-methyl-1,3-butadiene and 1,3-pentadiene, a hydrocarbon diluent selected from the group consisting of a paraffinic, cycloparaffinic and aromatic hydrocarbon having from 5 to 12 carbon atoms per molecule and a C2-C8 alkyllithium catalyst and at a predetermined temperature of from about 90* to about 235*C. to initiate polymerization of said diolefin therein, and continuing the polymerizaTion of said conjugated diolefin while maintaining the polymerization themperature within said specified range of from about 90* to about 235*C. with a continuous addition of said conjugated diolefin, said hydrocarbon diluent and said catalyst to form said rubbery polymer, the initiation and continuation of said polymerization being carried out under polymerization conditions in which kI is greater than kP.
Claim 4
Dependent Claim
157 words
Process for producing a rubbery polymer having a branched structure, which comprises bringing continuously into a polymerization zone a mixture consisting of a conjugated diolefin having from 4 to 5 carbon atoms per molecule and selected from the group consisting of 1, 3-butadiene, 2-methyl-1,3-butadiene and 1,3-pentadiene, a hydrocarbon diluent selected from the group consisting of a paraffinic, cycloparaffinic and aromatic hydrocarbon having from 5 to 12 carbon atoms per molecule and a C2-C8 alkyllithium catalyst and at a predetermined temperature of from about 90* to about 235*C. to initiate polymerization of said diolefin therein, and continuing the polymerizaTion of said conjugated diolefin while maintaining the polymerization themperature within said specified range of from about 90* to about 235*C. with a continuous addition of said conjugated diolefin, said hydrocarbon diluent and said catalyst to form said rubbery polymer, the initiation and continuation of said polymerization being carried out under polymerization conditions in which kI is greater than kP.
Claim 5
Dependent Claim
31 words
Process according to claim 1 wherein said hydrocarbon diluent is a member selected from the group consisting of pentane, hexane, isobutane, isooctane, n-dodecane, cyclopentane, cyclohexane, methylcyclohexane, benzene, toluene, xylene and ethylbenzene.
Claim 6
Dependent Claim
10 words
Process according to claim 1 wherein the catalyst is n-butyllithium.
Claim 7
Dependent Claim
22 words
Process according to claim 1, wherein said catalyst is selected from the group consisting of ethyllithium, propyllithium, n-butyllithium, amyllithium, hexyllithium and 2-ethylhexyllithium.
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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |