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US3759919A
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Copolymerization of a conjugated diene with a vinyl aromatic compound
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1971-04-01
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Granted: 1973-09-18
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Expires: 1991-04-01
Abstract
Abstract In the solution copolymerization of a conjugated diene monomer with a vinyl aromatic monomer dissolved in a hydrocarbon solvent reaction medium therefor containing a solubilized organolithium copolymerization initiator, the distribution of the monomers along the macromolecular copolymer chain can be rendered uniform or variably controlled while also reducing the 1,2- or 3,4addition content of the conjugated diene monomer within the copolymer product molecules in a reproducible manner by conducting the copolymerization in the reaction medium which contains a weakly polar solution of a complex of an aromatic ketone with an alkali metal other than lithium.
Inventors
- 👤 J Dillenschneider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:05
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
The process as defined by claim 1 wherein the weak polarity of the solution of the complex is imparted thereto by the presence therein of an ether, thioether or tertiary amine function contained in the aromatic ketone moiety of the complex or in the solvent for the complex.
Claim 2
Dependent Claim
23 words
The process as defined by claim 2 wherein the solvent for the complex is a weakly polar ether, thioether or tertiary amine compound.
Claim 3
Dependent Claim
38 words
The process as defined by claim 2 wherein the aromatic ketone moiety of the complex contains an ether, thioether or tertiary amine function and the complex is dissolved in a nonpolar or a very weakly polar solvent therefor.
Claim 4
Dependent Claim
52 words
The process as defined by claim 1 wherein the solvent for the complex is of a nature and in a quantity such that in the absence of the complex there is not produced in the copolymer an increase of more than 5 to 10 percentage points of 1,2 or 3,4 addition content.
Claim 5
Dependent Claim
34 words
The process as defined by claim 1 wherein the weakly polar solution of the complex is a complex of benzophenone with potassium dissolved in a weakly polar tertiary amine, ether or thioether solvent therefor.
Claim 6
Dependent Claim
34 words
The process as defined by claim 1 wherein the weakly polar solution of the complex is a complex of fluorenone with potassium dissolved in a weakly polar tertiary amine, ether or thioether solvent therefor.
Claim 7
Dependent Claim
26 words
The process as defined by claim 1 wherein the weakly polar solution of the complex is a complex of Micheler''s ketone with potassium dissolved in benzene.
Claim 8
Dependent Claim
29 words
The process as defined by claim 1 wherein the other alkali metal is potassium and the mole ratio of lithium to potassium is from about 3:1 to about 10:1.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |