US4010226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block polymers and their preparation
Assignee: Shell USA Inc
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Filing: 1975-07-17
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Granted: 1977-03-01
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Expires: 1995-07-17
Abstract
Abstract An improved process for the preparation of branched polymers is provided wherein the individual branches may be selected at will comprising the formation of an anionic polymer of a polymerizable monomer, coupling with a polyvinyl aromatic hydrocarbon and block polymerizing this coupled product with an anionically active polymerizable monomer.
Inventors
- 👤 Ronald K. Crossland
- 👤 Jaroslav G. Balas
- 👤 Arthur R. Bean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:22
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
A polymerization process comprising: a. polymerizing at least one polymerizable compound of the group consisting of conjugated dienes having from 4 to 12 carbon atoms and mono alkenyl-substituted aromatic hydrocarbons having from 8 to 20 carbon atoms under polymerization conditions at a temperature between about -75° C and +150° C with a hydrocarbyl monolithium initiator, the proportions of initiator and polymerizable compound being such as to give a monolithium terminated polymer having an average molecular weight of at least about 7,500; b. contacting the monolithium terminated polymer with a polyalkenyl aromatic compound at a temperature between about 10° C and about 90° C, whereby a coupled polylithio intermediate polymer is formed; and c. block polymerizing therewith at least one polymerizable compound of the group consisting of conjugated dienes, monoalkenyl arenes and monoalkenyl pyrdiene, at a temperature between about -75° C and +150° C each polymer branch so formed having an average molecular weight between about 5,000 to 1,000,000.
Claim 2
Dependent Claim
158 words
A polymerization process comprising: a. polymerizing at least one polymerizable compound of the group consisting of conjugated dienes having from 4 to 12 carbon atoms and mono alkenyl-substituted aromatic hydrocarbons having from 8 to 20 carbon atoms under polymerization conditions at a temperature between about -75° C and +150° C with a hydrocarbyl monolithium initiator, the proportions of initiator and polymerizable compound being such as to give a monolithium terminated polymer having an average molecular weight of at least about 7,500; b. contacting the monolithium terminated polymer with a polyalkenyl aromatic compound at a temperature between about 10° C and about 90° C, whereby a coupled polylithio intermediate polymer is formed; and c. block polymerizing therewith at least one polymerizable compound of the group consisting of conjugated dienes, monoalkenyl arenes and monoalkenyl pyrdiene, at a temperature between about -75° C and +150° C each polymer branch so formed having an average molecular weight between about 5,000 to 1,000,000.
Claim 3
Dependent Claim
36 words
A process according to claim 1 wherein the polymer of step (a) has the structure A-B-Li wherein A is a polymer block of a monoalkenyl arene and B is a polymer block of a conjugated diene.
Claim 4
Dependent Claim
48 words
A process according to claim 1 wherein each polymer branched initiated in step (c) has a structure selected from the group consisting of --A, --B, --B--A and --A--B, wherein A is a polymer block of a monoalkenyl arene and B is a polymer block of a conjugated diene.
Claim 5
Dependent Claim
27 words
A process according to claim 1 wherein a step subsequent to step (c) comprises hydrogenation of at least 90% of the olefinic bonds in the polymeric product.
Claim 6
Dependent Claim
18 words
A process according to claim 2 wherein the monoalkenyl arene is styrene and the conjugated diene is butadiene.
Claim 7
Dependent Claim
16 words
A process according to claim 5 wherein the polymer branch initiated in step (c) is polybutadiene.
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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) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |