US3948872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process for producing low cis-configuration homopolymers
Assignee: Phillips Petroleum Co
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Filing: 1971-01-25
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Granted: 1976-04-06
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Expires: 1991-01-25
Abstract
Abstract A polymerization process for preparing homopolymers of conjugated dienes having decreased cis-content resulting from the use of organolithium compounds as initiators wherein 1,2-dialkoxybenzene is introduced in a quantity sufficient to decrease the cis-content of the homopolymers formed.
Inventors
- 👤 William J. Trepka
- 👤 Ralph C. Farrar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:19
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
147 words
A polymerization process of preparing a homopolymer of a conjugated diene having decreased cis-content, comprising: contacting the conjugated diene having from 4 to 12 carbon atoms per molecule in a polymerization zone with an organolithium compound having the formula RLi x wherein R is selected from the group consisting of aliphatic, cycloaliphatic, and aromatic radicals, x is an integer from 1 to 4, inclusive, R has a valence equal to the integer and contains from 1 to 20 carbon atoms, inclusive; and a 1,2-dimethoxybenzene: ##SPC2## wherein R' is an alkyl radical having in the range of 1 to about 6 carbon atoms, R" is H or R', the total of all carbon atoms in all R" groups being less than 11 per molecule and at least one R" is H", said 1,2-dimethoxybenzene being present in a quantity sufficient to effect a decreased cis-content of the resulting homopolymer.
Claim 2
Dependent Claim
147 words
A polymerization process of preparing a homopolymer of a conjugated diene having decreased cis-content, comprising: contacting the conjugated diene having from 4 to 12 carbon atoms per molecule in a polymerization zone with an organolithium compound having the formula RLi x wherein R is selected from the group consisting of aliphatic, cycloaliphatic, and aromatic radicals, x is an integer from 1 to 4, inclusive, R has a valence equal to the integer and contains from 1 to 20 carbon atoms, inclusive; and a 1,2-dimethoxybenzene: ##SPC2## wherein R' is an alkyl radical having in the range of 1 to about 6 carbon atoms, R" is H or R', the total of all carbon atoms in all R" groups being less than 11 per molecule and at least one R" is H", said 1,2-dimethoxybenzene being present in a quantity sufficient to effect a decreased cis-content of the resulting homopolymer.
Claim 3
Dependent Claim
37 words
The process according to claim 1 wherein the 1,2-dimethoxybenzene is introduced into the polymerization zone in an amount of from about 0.5 to about 1.5 parts by weight per 100 parts by weight of the conjugated diene.
Claim 4
Dependent Claim
14 words
The process according to claim 2 wherein the conjugated diene is contacted with n-butyllithium.
Claim 5
Dependent Claim
29 words
The process of claim 3 wherein said conjugated diene is butadiene and the resulting homopolymer is polybutadiene having a cis-content of from about 23 percent to about 29 percent.
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) | 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 |