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US4104465A
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US
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High-vinyl homopolymers and copolymers of butadiene
Assignee: Bridgestone Firestone Inc
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Filing: 1977-01-31
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Granted: 1978-08-01
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Expires: 1997-01-31
Abstract
Abstract The invention relates to the production of high molecular weight polymers of broad molecular weight distribution by using a sodium catalyst in the presence of a chelating diamine in the polymerization of (1) conjugated dienes, (2) a mixture of conjugated dienes and (3) a mixture of conjugated diene and vinyl monomer. Lithium and potassium alkoxides speed up the reaction.
Inventors
- 👤 Adel Farhan Halasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:33
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
136 words
The process of polymerizing monomer selected from the group consisting of (a) conjugated diene containing 4 to 8 carbon atoms, (b) a mixture of such conjugated dienes, and (c) a mixture of such conjugated diene and a vinyl aromatic compound, to produce a polymer having a molecular weight of 100,000 to 5,000,000, a dilute solution viscosity of 1 to 10, and a 1,2-vinyl group content of at least 80 percent, which process comprises polymerizing such conjugated diene with or without vinyl monomer by reacting 1 to 2 parts of sodium as hydrocarbon sodium with the monomer in the presence of 0.1 to 10 parts by weight of chelating diamine and 0.1 to 2.0 parts of lithium or potassium t-alkoxide per 100 parts of monomer, in which alkoxide the alkane group contains 3 to 20 carbon atoms.
Claim 2
Dependent Claim
136 words
The process of polymerizing monomer selected from the group consisting of (a) conjugated diene containing 4 to 8 carbon atoms, (b) a mixture of such conjugated dienes, and (c) a mixture of such conjugated diene and a vinyl aromatic compound, to produce a polymer having a molecular weight of 100,000 to 5,000,000, a dilute solution viscosity of 1 to 10, and a 1,2-vinyl group content of at least 80 percent, which process comprises polymerizing such conjugated diene with or without vinyl monomer by reacting 1 to 2 parts of sodium as hydrocarbon sodium with the monomer in the presence of 0.1 to 10 parts by weight of chelating diamine and 0.1 to 2.0 parts of lithium or potassium t-alkoxide per 100 parts of monomer, in which alkoxide the alkane group contains 3 to 20 carbon atoms.
Claim 3
Dependent Claim
19 words
The process of claim 1 in which butadiene is polymerized to produce polymer containing at least 85 percent 1,2-polybutadiene.
Claim 4
Dependent Claim
12 words
The process of claim 2 in which the chelating diamine is N,N,N',N'-tetramethylethylenediamine.
Claim 5
Dependent Claim
17 words
The process of claim 2 in which the sodium compound used in the catalyst system is n-butylsodium.
Claim 6
Dependent Claim
16 words
The process of claim 1 in which 0.1 to 2.0 parts of potassium alkoxide is present.
Claim 7
Dependent Claim
16 words
The process of claim 1 in which 0.1 to 2.0 parts of lithium t-alkoxide is present.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |