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US4004070A
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Viscosity reduction of organopolylithium-initiated polymer solutions
Assignee: Phillips Petroleum Co
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Filing: 1972-03-27
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Granted: 1977-01-18
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Expires: 1992-03-27
Abstract
Abstract The viscosity of organopolylithium-initiated polymer solutions is reduced by introducing into the polymerization reaction after the polymerization reaction is at least 80 percent complete, an organomonolithium compound.
Inventors
- 👤 Ralph C. Farrar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:53
CPC Classifications
C; C08; C08C; C08C19/00; C08C19/30; C08C19/42; C08C19/44; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A method for producing polymers by the homopolymerization of butadiene or the copolymerization of butadiene and styrene which comprises: a. homopolymerizing said butadiene or copolymerizing said butadiene and said styrene with an initiator comprising an organo-polylithium compound to form a first mixture comprising polymers. b. introducing an organo-monolithium compound into said first mixture after the polymerization is at least 80 percent complete to form a second mixture comprising polymers; c. then introducing silicon tetrachloride coupling agent into said second mixture to couple said polymer; and, d. recovering said polymers.
Claim 2
Independent Claim
89 words
A method for producing polymers by the homopolymerization of butadiene or the copolymerization of butadiene and styrene which comprises: a. homopolymerizing said butadiene or copolymerizing said butadiene and said styrene with an initiator comprising an organo-polylithium compound to form a first mixture comprising polymers. b. introducing an organo-monolithium compound into said first mixture after the polymerization is at least 80 percent complete to form a second mixture comprising polymers; c. then introducing silicon tetrachloride coupling agent into said second mixture to couple said polymer; and, d. recovering said polymers.
References Cited (Backward Citations)
US3177190A
Cited
US3280084A
Cited
US3281383A
Cited
US3383377A
Cited
US3468972A
Cited
US3506639A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |