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Patent US3846385A successfully refreshed from Google Patents.
US3846385A
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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: 1973-07-16
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Granted: 1974-11-05
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Expires: 1993-07-16
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%) 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
- 👤 I Hargis
- 👤 R Livigni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:41
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
THE METHOD WHICH COMPRISES POLYMERIZING UNDER INERT CONDITIONS IN A HYDROCARBON SOLVENT AT A TEMPERATURE OF FROM ABOUT -90* TO 100*C. A POLYMERIZABLE VINYL MONOMER HAVING AN ACTIVATED DOUBLE BOND AND HAVING UP TO 14 CARBON ATOMS AND BEING FREE OF GROUPS WHICH WOULD DESTROY THE CATALYST COMPLEX, WITH THE CATALYST IN A MINOR EFFECTIVE AMOUNT SUFFICIENT TO POLYMERIZE SAID MONOMER TO OBTAIN A POLYMER AND COMPRISING A HYDROCARBON SOLUBLE COMPLEX OF (1)
Claim 2
Independent Claim
73 words
THE METHOD WHICH COMPRISES POLYMERIZING UNDER INERT CONDITIONS IN A HYDROCARBON SOLVENT AT A TEMPERATURE OF FROM ABOUT -90* TO 100*C. A POLYMERIZABLE VINYL MONOMER HAVING AN ACTIVATED DOUBLE BOND AND HAVING UP TO 14 CARBON ATOMS AND BEING FREE OF GROUPS WHICH WOULD DESTROY THE CATALYST COMPLEX, WITH THE CATALYST IN A MINOR EFFECTIVE AMOUNT SUFFICIENT TO POLYMERIZE SAID MONOMER TO OBTAIN A POLYMER AND COMPRISING A HYDROCARBON SOLUBLE COMPLEX OF (1)
Claim 3
Dependent Claim
45 words
A method according to claim 1 in which said mole ratio is from about 0.30 to 3.0, and in which said complex is used in an amount of from about 0.00001 to 0.002 mole, computed as dibutyl magnesium, per 100 grams total of said monomer(s).
Claim 4
Dependent Claim
33 words
A method according to claim 2 in which said complex is used in an amount of from about 0.0003 to 0.0009 mole, computed as dibutyl magnesium, per 100 grams total of said monomer(s).
Claim 5
Dependent Claim
40 words
A method according to claim 3 in which said monomer is selected from the group consisting of (1) butadiene-1,3 and (2) mixtures of butadiene-1,3 and up to a total of 25% by weight of said mixtures of styrene and/or isoprene.
Claim 6
Dependent Claim
18 words
A method according to claim 4 in which R is methyl and said dibutyl magnesium compound is n-butyl-sec-butylmagnesium.
Claim 7
Dependent Claim
12 words
The method according to claim 4 in which said monomer is (1).
Claim 8
Dependent Claim
12 words
The method according to claim 4 in which said monomer is (2).
Claim 9
Dependent Claim
16 words
The method according to claim 7 in which in (2) said second named monomer is styrene.
Claim 10
Dependent Claim
16 words
The method according to claim 7 in which in (2) said second named monomer is isoprene.
Claim 11
Dependent Claim
21 words
The method according to claim 7 in which in (2) said second named monomer is a mixture of styrene and isoprene.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |