Patent US3903019A successfully refreshed from Google Patents.
US3903019A
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Preparation of solution polymers using a barium di-tert alkoxide and a di-butyl magnesium catalyst complex
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1974-06-03
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Granted: 1975-09-02
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Expires: 1994-06-03
Abstract
Abstract Solution polymers and rubbers can be prepared from monomers using a new catalyst complex of barium di-tert-alkoxide and a dibutyl magnesium compound. In particular, homopolymers and copolymers of butadiene with styrene, prepared with this catalyst, are uniquely characterized by the diene adducts having a low vinyl content (6-10 percent) and a high trans-1,4 structure (80-85 percent). Furthermore, the copolymer has a random comonomer sequence distribution. This molecular structure permits elastomers containing little or no styrene to have sufficient stereoregularity to crystallize.
Inventors
- 👤 Ivan Glen Hargis
- 👤 Russell A Livigni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:55
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/14; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/06; C08G65/08; C08G65/10; C08G65/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
42 words
A COMPOSITION OF MATTER USEFUL IN ANIONIC POLYMERIZATION AND COMPRISING A HYDROCARBON SOLUBLE COMPLEX OF BA(-O-C(-R)3)2 IN WHICH R IS SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL AND PROPYL RADICALS AND WHEREIN EACH R MAY BE THE SAME OR DIFFERENT AND
Claim 2
Dependent Claim
42 words
A COMPOSITION OF MATTER USEFUL IN ANIONIC POLYMERIZATION AND COMPRISING A HYDROCARBON SOLUBLE COMPLEX OF BA(-O-C(-R)3)2 IN WHICH R IS SELECTED FROM THE GROUP CONSISTING OF METHYL, ETHYL AND PROPYL RADICALS AND WHEREIN EACH R MAY BE THE SAME OR DIFFERENT AND
Claim 3
Dependent Claim
35 words
DIBUTYL MAGNESIUM IN WHICH AT LEAST ABOUT 30 MOLE % OF THE BUTYL RADICALS ARE SECONDARY BUTYL RADICALS, THE MOLE RATIO OF SAID BARIUM COMPOUND TO SAID MAGNESIUM COMPOUND BEING FROM ABOUT 0.25 TO 3.25.
Claim 4
Dependent Claim
35 words
DIBUTYL MAGNESIUM IN WHICH AT LEAST ABOUT 30 MOLE % OF THE BUTYL RADICALS ARE SECONDARY BUTYL RADICALS, THE MOLE RATIO OF SAID BARIUM COMPOUND TO SAID MAGNESIUM COMPOUND BEING FROM ABOUT 0.25 TO 3.25.
Claim 5
Dependent Claim
35 words
dibutyl magnesium in which at least about 30 mole % of the butyl radicals are secondary butyl radicals, the mole ratio of said barium compound to said magnesium compound being from about 0.25 to 3.25.
Claim 6
Dependent Claim
35 words
dibutyl magnesium in which at least about 30 mole % of the butyl radicals are secondary butyl radicals, the mole ratio of said barium compound to said magnesium compound being from about 0.25 to 3.25.
Claim 7
Dependent Claim
17 words
A composition according to claim 1 in which said mole ratio is from about 0.30 to 3.0.
Claim 8
Dependent Claim
18 words
A composition according to claim 2 in which R is methyl and the magnesium compound is n-butyl-sec-butyl magnesium.
Claim 9
Dependent Claim
24 words
A composition according to claim 3 in which in said magnesium compound about 50 mole % of the butyl radicals are secondary butyl radicals.
Claim 10
Dependent Claim
11 words
A composition according to claim 1 in which R is methyl.
Claim 11
Dependent Claim
11 words
A composition according to claim 1 in which R is ethyl.
Claim 12
Dependent Claim
11 words
A composition according to claim 1 in which R is propyl.
Claim 13
Dependent Claim
16 words
A composition according to claim 1 in which said dibutyl magnesium compound has the formula (n-C4H9)Mg(sec-C4H9).
Claim 14
Dependent Claim
18 words
A composition according to claim 1 in which said dibutyl magnesium compound has the formula (n-C4H9)2Mg . (sec-C4H9)2Mg.
Claim 15
Dependent Claim
18 words
A composition according to claim 1 in which said dibutyl magnesium compound has the formula ((n-C4H9)2Mg)2 . (sec-C4H9)2Mg.
References Cited (Backward Citations)
US3728323A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |