US3725488A
Expired / Lapsed
US
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Multilithium polymerization initiators
Assignee: Phillips Petroleum Co
•
Filing: 1971-01-21
•
Granted: 1973-04-03
•
Expires: 1991-01-21
Abstract
Abstract Multilithium polymerization initiators are prepared by the metalation of multimethyl-substituted aromatic hydrocarbons with tertiary or secondary alkyl or cycloalkyllithium compounds in hydrocarbon media.
Inventors
- 👤 H Hsieh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:29
CPC Classifications
C; C08; C08F; C08F4/00; C08F4/06; C08F4/12; C07; C07F; C07F1/00; C07F1/02; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
35 words
The method according to claim 1 wherein said (II) multimethyl aromatic compound is further characterized as having at least one hydrocarbyl substituent containing from two to 10 carbon atoms in addition to said methyl groups.
Claim 2
Dependent Claim
18 words
The method according to claim 1 wherein is employed a mole ratio of (I):(II) of at least 2:1.
Claim 3
Dependent Claim
46 words
The method according to claim 3 wherein is employed an excess of said (I) to the extent of at least one mole of said (I) for each methyl group per mole of said (II), and wherein said (II) contains at least three methyl groups per molecule.
Claim 4
Dependent Claim
9 words
The catalyst prepared by the method of claim 3.
Claim 5
Dependent Claim
37 words
The method according to claim 3 wherein said admixing is at a temperature of 0* to 150* C. at a pressure sufficient to maintain substantially liquid conditions, said (I) contains three to 12 carbon atoms per molecule.
Claim 6
Dependent Claim
24 words
The method according to claim 6 wherein is employed from 5 to 15 percent excess of said (I) above said mole ratio of 2:1.
Claim 7
Dependent Claim
31 words
The method according to claim 6 wherein said admixing is conducted in the presence of a reaction-inert atmosphere, and said hydrocarbon diluent contains from four to 10 carbon atoms per molecule.
Claim 8
Dependent Claim
14 words
The method according to claim 8 wherein said (I) is a sec- or tert-alkyllithium.
Claim 9
Dependent Claim
21 words
The method according to claim 9 wherein said (I) is sec-butyllithium, or tert-butyllithium, and said (II) is mesitylene, durene, or hexamethylbenzene.
References Cited (Backward Citations)
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |