US3901865A
Expired / Lapsed
US
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Polymerization of conjugated diene compounds
Assignee: Saitama University NUC
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Filing: 1973-11-16
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Granted: 1975-08-26
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Expires: 1993-11-16
Abstract
Abstract A method of polymerizing conjugated diene compounds which consists in contacting a monomeric conjugated diene compound with a polymerization initiator formed by mixing aluminum borohydride with a titanium halide.
Inventors
- 👤 Toyosuke Tanaka
- 👤 Isamu Okuzumi
- 👤 Tsuneo Matsuda
- 👤 Katsunori Kimijima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:00
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
A METHOD OF POLYMERIZING CONJUGATED DIENE COMPOUNDS WHICH COMPRISES CONTACTING A MONOMERIC CONJUGATED DIENE COMPOUND IN A LIQUID ORGANIC MEDIUM AT A TEMPERATURE IN THE RANGE OF -10* TO 100*C. WITH A POLYMERIZATION INITIATOR WHICH IS THE SOLID REACTION PRODUCT FORMED BY MIXING ALUMINUM BOROHYDRIDE COMPOMENT WITH A TITANIUM HALIDE COMPONENT IN A MOLAR RATIO RANGING FROM 0.2:1 TO 2:1.
Claim 2
Independent Claim
60 words
A METHOD OF POLYMERIZING CONJUGATED DIENE COMPOUNDS WHICH COMPRISES CONTACTING A MONOMERIC CONJUGATED DIENE COMPOUND IN A LIQUID ORGANIC MEDIUM AT A TEMPERATURE IN THE RANGE OF -10* TO 100*C. WITH A POLYMERIZATION INITIATOR WHICH IS THE SOLID REACTION PRODUCT FORMED BY MIXING ALUMINUM BOROHYDRIDE COMPOMENT WITH A TITANIUM HALIDE COMPONENT IN A MOLAR RATIO RANGING FROM 0.2:1 TO 2:1.
Claim 3
Dependent Claim
39 words
The method of claim 1 wherein said monomeric conjugated diene compound is selected from the group consisting of the straight chain, branched chain and cyclic diolefins having 4 - 7 carbon atoms in their molecular structure substituted derivatives thereof.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said titanium halide is selected from the group consisting of titanium trichloride and titanium tetrachloride.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein said liquid organic medium is a solvent which can dissolve at least one of the components forming said polymerization initiator as well as the conjugated diene compound to be polymerized.
Claim 6
Dependent Claim
29 words
The method of claim 1 wherein said polymerization initiator is suspended in said liquid organic medium at the rate of 1 - 10 grams per liter of the latter.
Claim 7
Dependent Claim
23 words
The method of claim 1 wherein said monomeric conjugated diene compound is selected from the group consisting of butadiene-1,3, isoprene, 2,3-dimethylbutadiene-1,3 and cyclohexadiene.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the molar ratio of aluminum borohydride to titanium halide ranges from 0.8:1 to 1.5:1.
Claim 9
Dependent Claim
23 words
The method of claim 1 wherein the conjugated monomer concentration in the organic liquid medium is about 5 to 20 percent by weight.
Claim 10
Dependent Claim
25 words
The method of claim 4 wherein said liquid organic medium is selected from the group consisting of pentane, hexane, cyclohexane, benzene, toluene, xylene and tetrahydrofuran.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |