US4387202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization using mixed aluminum compounds
Assignee: Hoechst AG
•
Filing: 1981-12-15
•
Granted: 1983-06-07
•
Expires: 2001-12-15
Abstract
Abstract A process is described for the polymerization of ethylene or copolymerization of ethylene with a C 3 to C 15 alpha olefin in solution, suspension or in the gas phase at 20° to 250° C. and 1 to 100 bars in the presence of a mixed catalyst comprising a separately produced halogen-containing titanium(III) compound and an organoaluminum compound while controlling the molecular weight with oxygen, wherein a mixture of organoaluminum compounds is employed comprising a halogen-containing aluminum alkyl and a trialkyl aluminum compound in a molar ratio of 1:0.05 to 1:20, the combined amount of organoaluminum compounds being present in an amount of 0.01 to 20 moles per one mole of halogen-containing Ti(III) compound.
Inventors
- 👤 Jurgen Falbe
- 👤 Boy Cornils
- 👤 Guunter Hetkamp
- 👤 Karl Otterbein, deceased
- 👤 Wolfgang Payer
- 👤 Peter Schneller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:47
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; C08F210/00; C08F210/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
In a process for the polymerization of ethylene or copolymerization of ethylene with a C 3 to C 15 alpha olefin in solution, suspension or in the gas phase at 20° to 250° C. and 1 to 100 bars in the presence of a mixed catalyst containing separately produced titanium trichloride (III) and an organoaluminum compound while controlling molecular weight with oxygen, the improvement wherein: (a) a mixture of organoaluminum compounds is employed comprising ethyl aluminum dichloride and triethyl aluminum in a molar ratio of 1:0.05 to 1:20; (b) the combined amount of said organoaluminum compounds present being 0.1 to 20 mols per mol of titanium trichloride (III) compound; and (c) hydrogen is added to the polymerization reaction mixture during polymerization to control molecular weight.
Claim 2
Dependent Claim
125 words
In a process for the polymerization of ethylene or copolymerization of ethylene with a C 3 to C 15 alpha olefin in solution, suspension or in the gas phase at 20° to 250° C. and 1 to 100 bars in the presence of a mixed catalyst containing separately produced titanium trichloride (III) and an organoaluminum compound while controlling molecular weight with oxygen, the improvement wherein: (a) a mixture of organoaluminum compounds is employed comprising ethyl aluminum dichloride and triethyl aluminum in a molar ratio of 1:0.05 to 1:20; (b) the combined amount of said organoaluminum compounds present being 0.1 to 20 mols per mol of titanium trichloride (III) compound; and (c) hydrogen is added to the polymerization reaction mixture during polymerization to control molecular weight.
Claim 3
Dependent Claim
26 words
A process according to claim 1, wherein an alcohol is added to the polymerization reaction mixture during polymerization to control molecular weight or molecular weight distribution.
Claim 4
Dependent Claim
21 words
A process according to claim 1, wherein the ratio of ethyl aluminum dichloride to triethyl aluminum ranges between 1:0.1 and 1:5.
Claim 5
Dependent Claim
30 words
A process according to claim 1 wherein the mixture of organoaluminum compounds is used in an amount of 0.5 to 3 moles per one mole of titanium trichloride (III) compound.
References Cited (Backward Citations)
GB825958A
Cited
US2822357A
Cited
GB882200A
Cited
GB828958A
Cited
US3108973A
Cited
US3773735A
Cited
US3592880A
Cited
US4048419A
Cited
US4059720A
Cited
US4004071A
Cited
GB1525912A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |