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US3969335A
Expired / Lapsed
US
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Manufacture of homopolymers of 4-methylpentene-1
Assignee: BASF SE
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Filing: 1975-02-06
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Granted: 1976-07-13
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Expires: 1995-02-06
Abstract
Abstract Homopolymers of 4-methylpentene-1 are prepared by homopolymerization of 4-methylpentene-1 at a temperature above room temperature, in the presence of hydrogen and in contact with a Ziegler/Natta catalyst system. The polymerization is carried out at a relatively very high temperature and in the presence of an inert gas, the polymerization system being under a specific total pressure, while the partial pressures of the inert gas and the hydrogen have specific values. In this way, homopolymers having large crystalline fractions are obtained in high yields per unit of catalyst system per unit time.
Inventors
- 👤 Johann Nickl
- 👤 Hans Schick
- 👤 Heinz Mueller-Tamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:31
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/14; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/905
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
168 words
A process for the manufacture of homopolymers of 4-methylpentene-1 by homopolymerization of a liquid excess of 4-methylpentene-1 at (1) a temperature above room temperature and (2) in the presence of hydrogen, using (3) a Ziegler/Natta catalyst system consisting of (3.1) a titanium trichloride component and (3.2) an alkyl aluminum component, the atomic ratio of titanium in the catalyst component (3.1) to aluminum in the catalyst component (3.2) being from 1:1 to 1:100, wherein polymerization is carried out a. at a temperature of from 90° to 150°C, b. in the presence of an inert gas consisting of one or more of nitrogen, helium, neon, argon and krypton, c. at a total pressure of the polymerization system of from 3 to 20 atmospheres absolute and d. with the proviso that the partial pressure (d 1 ) of the inert gas in the polymerization system is from 0.1 to 17 atmospheres absolute and the hydrogen partial pressure (d 2 ) in the polymerization system is from 0.01 to 10 atmospheres absolute.
Claim 2
Dependent Claim
168 words
A process for the manufacture of homopolymers of 4-methylpentene-1 by homopolymerization of a liquid excess of 4-methylpentene-1 at (1) a temperature above room temperature and (2) in the presence of hydrogen, using (3) a Ziegler/Natta catalyst system consisting of (3.1) a titanium trichloride component and (3.2) an alkyl aluminum component, the atomic ratio of titanium in the catalyst component (3.1) to aluminum in the catalyst component (3.2) being from 1:1 to 1:100, wherein polymerization is carried out a. at a temperature of from 90° to 150°C, b. in the presence of an inert gas consisting of one or more of nitrogen, helium, neon, argon and krypton, c. at a total pressure of the polymerization system of from 3 to 20 atmospheres absolute and d. with the proviso that the partial pressure (d 1 ) of the inert gas in the polymerization system is from 0.1 to 17 atmospheres absolute and the hydrogen partial pressure (d 2 ) in the polymerization system is from 0.01 to 10 atmospheres absolute.
Claim 3
Dependent Claim
14 words
A process as set forth in claim 1 wherein said inert gas is nitrogen.
Claim 4
Dependent Claim
14 words
A process as set forth in claim 1 wherein said inert gas is argon.
Claim 5
Dependent Claim
17 words
A process as set forth in claim 1 wherein said reaction temperature is from 110° to 130°C.
Claim 6
Dependent Claim
23 words
A process as set forth in claim 1 wherein the total pressure of the polymerization system is from 8 to 10 atmospheres absolute.
Claim 7
Dependent Claim
23 words
A process as set forth in claim 1 wherein the partial pressure of the inert gas is from 1 to 5 atmospheres absolute.
Claim 8
Dependent Claim
21 words
A process as set forth in claim 1 wherein the partial pressure of hydrogen is from 0.1 to 2 atmospheres absolute.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |