US4020008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for producing high trans-polybutadiene
Assignee: Phillips Petroleum Co
•
Filing: 1975-09-04
•
Granted: 1977-04-26
•
Expires: 1995-09-04
Abstract
Abstract 1,3-Butadiene is polymerized to produce a high trans-polybutadiene employing a three-component catalyst system comprising: (1) a reducing agent in an oxyether solution; (2) a titanium halide plus molecular iodine wherein the halide is chloride or bromide, or titanium tetraiodide; and (3) a thioether.
Inventors
- 👤 Floyd E. Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:30
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
148 words
A catalyst useful for the production of high trans-polybutadiene consisting essentially of: a. an oxyether solution of a reducing agent represented by the general formula XMH 4 , wherein X is a metal selected from the group consisting of lithium, sodium, potassium, rubidium, and cesium, and M is Al; b. a titanium halide component selected from the group consisting of titanium tetrachloride plus molecular iodine, titanium tetrabromide plus molecular iodine, and titanium tetraiodide; and c. at least one thioether represented by the general formula R--S--R' wherein R and R' are hydrocarbon radicals selected from the group consisting of alkyl and cycloalkyl radicals containing from about 1 to 12 carbon atoms, or R and R' are hydrocarbon radicals selected from the group consisting of alkylene groups joined to the sulfur atom and to each other to form a saturated heterocyclic thioether containing from about 4 to 10 carbon atoms.
Claim 2
Dependent Claim
148 words
A catalyst useful for the production of high trans-polybutadiene consisting essentially of: a. an oxyether solution of a reducing agent represented by the general formula XMH 4 , wherein X is a metal selected from the group consisting of lithium, sodium, potassium, rubidium, and cesium, and M is Al; b. a titanium halide component selected from the group consisting of titanium tetrachloride plus molecular iodine, titanium tetrabromide plus molecular iodine, and titanium tetraiodide; and c. at least one thioether represented by the general formula R--S--R' wherein R and R' are hydrocarbon radicals selected from the group consisting of alkyl and cycloalkyl radicals containing from about 1 to 12 carbon atoms, or R and R' are hydrocarbon radicals selected from the group consisting of alkylene groups joined to the sulfur atom and to each other to form a saturated heterocyclic thioether containing from about 4 to 10 carbon atoms.
Claim 3
Dependent Claim
70 words
The catalyst of claim 1 wherein the mole ratio of thioether to reducing agent is in the range of from about 0.1:1 to 100:1; wherein the mole ratio of reducing agent to the titanium halide component is in the range of from about 1:1 to 6:1; and wherein the mole ratio of molecular iodine to titanium tetrachloride and titanium tetrabromide is in the range of from about 0.5:1 to 5:1.
Claim 4
Dependent Claim
70 words
The catalyst of claim 1 wherein the mole ratio of thioether to reducing agent is in the range of from about 1:1 to 50:1; wherein the mole ratio of reducing agent to the titanium halide component is in the range of from about 1.5:1 to 5:1; and wherein the mole ratio of molecular iodine to titanium tetrachloride and titanium tetrabromide is in the range of from about 1:1 to 3:1.
Claim 5
Dependent Claim
38 words
The catalyst of claim 1 wherein the oxyether solution of a reducing agent is lithium aluminum hydride in a diethyl ether solution, the titanium halide component is titanium tetrachloride plus molecular iodine, and the thioether is dimethyl sulfide.
Claim 6
Dependent Claim
10 words
The catalyst of claim 4 wherein the thioether is tetrahydrothiophene.
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) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |