Patent US4092375A successfully refreshed from Google Patents.
US4092375A
Expired / Lapsed
US
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Preparation of a non-linear elastomeric copolymer
Assignee: Shell USA Inc
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Filing: 1975-10-03
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Granted: 1978-05-30
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Expires: 1995-10-03
Abstract
Abstract A process is provided for the preparation of branched vulcanizable copolymers having improved green strength.
Inventors
- 👤 Arie D. Vreugdenhil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:12
CPC Classifications
C; C08; C08G; C08G81/00; C08G81/02; C08G81/021; C08G81/022; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/044
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
165 words
A process for the preparation of a non-linear, elastomeric copolymer, which comprises: (a) polymerizing a conjugated diene in the presence of a polyvinylarene lithium compound, A-Li, in which A indicates a polymerized monovinylarene block, having an average molecular weight between 5000 and 35000, so as to form a block copolymer A-B-Li, in which block B substantially comprises polymerized, conjugated diene molecules and in which block A-B has an LVN between 0.1 and 10 dl/g; (b) polymerizing a conjugated diene in the presence of an alkyllithium initiator, R-Li, R being an alkyl group, so as to form a polymer block B'-Li, block B' having an LVN between 0.1 and 10 dl/g, and the molar ratio X between the initiator R-Li and the compound A-Li being at least 2.5; (c) coupling the mixture of polymer blocks A-B-Li and B'-Li obtained by the polymerizations mentioned sub (a) and (b) with a coupling agent C which is at least trifunctional in so far as its coupling activity is concerned.
Claim 2
Dependent Claim
165 words
A process for the preparation of a non-linear, elastomeric copolymer, which comprises: (a) polymerizing a conjugated diene in the presence of a polyvinylarene lithium compound, A-Li, in which A indicates a polymerized monovinylarene block, having an average molecular weight between 5000 and 35000, so as to form a block copolymer A-B-Li, in which block B substantially comprises polymerized, conjugated diene molecules and in which block A-B has an LVN between 0.1 and 10 dl/g; (b) polymerizing a conjugated diene in the presence of an alkyllithium initiator, R-Li, R being an alkyl group, so as to form a polymer block B'-Li, block B' having an LVN between 0.1 and 10 dl/g, and the molar ratio X between the initiator R-Li and the compound A-Li being at least 2.5; (c) coupling the mixture of polymer blocks A-B-Li and B'-Li obtained by the polymerizations mentioned sub (a) and (b) with a coupling agent C which is at least trifunctional in so far as its coupling activity is concerned.
Claim 3
Dependent Claim
26 words
A process according to claim 1, in which the block A of the polyvinylarene lithium compound used has an average molecular weight between 15,000 and 30,000.
Claim 4
Dependent Claim
21 words
A process according to claim 1, in which block A-B and/or block B' have an LVN between 0.2 and 3 dl/g.
Claim 5
Dependent Claim
19 words
A process according to claim 1, in which A-Li is polystyrl lithium compound, A being a polymerized styrene block.
Claim 6
Dependent Claim
13 words
A process according to claim 1, in which the conjugated diene is butadiene.
Claim 7
Dependent Claim
21 words
A process according to claim 1, in which the polymer blocks B and B' contain a minor amount of copolymerized monovinylarene.
Claim 8
Dependent Claim
64 words
A process according to claim 6, in which first a starting mixture is formed from a diluent and less than 50%w of the conjugated diene and the monovinylarene, subsequently initiating the mixture by addition of the initiator R-Li or A-Li, and keeping the monomer ratio in the reaction mixture during copolymerization substantially constant by addition of the remaining part of each of the monomers.
Claim 9
Dependent Claim
80 words
A process according to claim 1, in which the compound A-Li is first prepared in a diluent by polymerizing the monovinylarene in the presence of an amount, p, of the initiator R-Li, subsequently adding the conjugated diene and a further amount, q, of the initiator R-Li to compound A-Li formed in the diluent, R being an alkyl group and the molar ratio of q/p being at least 2.5, so as to form the mixture of polymer blocks A-B-Li and B'-Li.
Claim 10
Dependent Claim
16 words
A process according to claim 1 in which the ratio X is between 2.5 and 10.
Claim 11
Dependent Claim
12 words
A non-linear, elastomeric copolymer, prepared by a process according to claim 1.
Claim 12
Dependent Claim
14 words
A process according to claim 1 wherein the coupling agent C is dimethyl adipate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-29 | 1981-11-28 | 1982-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-29 | 1985-11-28 | 1986-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-29 | 1989-11-28 | 1990-05-30 | $7700.00 | Window Closed / Lapsed |