US3949020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoplastic block polymers
Assignee: Goodyear Tire and Rubber Co
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Filing: 1974-09-03
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Granted: 1976-04-06
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Expires: 1994-09-03
Abstract
Abstract A method of preparation and the composition of thermoplastic block polymers wherein divinylbenzene is added with the diolefin monomer to a polystyryllithium initiator to prepare a unique block polymer having good physical characteristics and low gel.
Inventors
- 👤 Robert T. Prudence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:11
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/044
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A process for the preparation of thermoplastic block polymers by contacting conjugated diolefinic monomers mixed with an amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene varying from about 2/1 to about 10/1 of divinylbenzene/active lithium ratio, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the polymer block.
Claim 2
Dependent Claim
69 words
A process for the preparation of thermoplastic block polymers by contacting conjugated diolefinic monomers mixed with an amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene varying from about 2/1 to about 10/1 of divinylbenzene/active lithium ratio, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the polymer block.
Claim 3
Dependent Claim
72 words
A thermoplastic block polymer product by the process of contacting conjugated diolefinic monomers mixed with a suitable amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene being from 2/1 to 10/1 moles of divinylbenzene per mole of active lithium catalyst, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the block polymer.
Claim 4
Dependent Claim
72 words
A thermoplastic block polymer product by the process of contacting conjugated diolefinic monomers mixed with a suitable amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene being from 2/1 to 10/1 moles of divinylbenzene per mole of active lithium catalyst, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the block polymer.
Claim 5
Dependent Claim
68 words
A process for the preparation of thermoplastic block polymers by contacting conjugated diolefinic monomers mixed with an amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene varying from about 0.5/1 to 25/1 of divinylbenzene/active lithium ratio, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the polymer block.
Claim 6
Dependent Claim
68 words
A process for the preparation of thermoplastic block polymers by contacting conjugated diolefinic monomers mixed with an amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene varying from about 0.5/1 to 25/1 of divinylbenzene/active lithium ratio, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the polymer block.
Claim 7
Dependent Claim
34 words
A method according to claim 3 wherein the conjugated diolefinic monomer contains from 4 to about 12 carbon atoms and is selected from the group consisting of isoprene, piperylene, ethyl butadiene, 2,3-dimethylbutadiene and butadiene.
Claim 8
Dependent Claim
31 words
A method according to claim 3 wherein the polystyryllithium catalyst is prepared by reacting an alkyl lithium compound with a styrene monomer selected from the group of styrene, p-methylstyrene and p-t-butylstyrene.
Claim 9
Dependent Claim
23 words
A method according to claim 4 wherein the alkyl lithium compound is selected from the group of n-butyllithium, secondary butyllithium, isopropyllithium and amyllithium.
Claim 10
Dependent Claim
73 words
A thermoplastic block polymer product produced by the process of contacting conjugated diolefinic monomers mixed with a suitable amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene being from 0.5/1 to 25/1 moles of divinylbenzene per mole of active lithium catalyst, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the block polymer.
Claim 11
Dependent Claim
73 words
A thermoplastic block polymer product produced by the process of contacting conjugated diolefinic monomers mixed with a suitable amount of divinylbenzene under solution polymerization conditions with a polystyryl lithium catalyst, said amount of divinylbenzene being from 0.5/1 to 25/1 moles of divinylbenzene per mole of active lithium catalyst, whereby resulting in a thermoplastic block polymer that is non-gel and has the divinylbenzene coupling agent attached to the diolefinic portion of the block polymer.
References Cited (Backward Citations)
US3363659A
Cited
US3639517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |