Patent US2333212A successfully refreshed from Google Patents.
Patent US4857612A successfully refreshed from Google Patents.
US4857612A
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US
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Process for the polymerization of alpha olefins
Assignee: Chevron USA Inc
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Filing: 1987-05-04
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Granted: 1989-08-15
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Expires: 2007-05-04
Abstract
Abstract A process for the stereoregular polymerization of alpha olefins which comprises polymerizing an alpha olefin having from 2 to 8 carbon atoms in the presence of a catalyst comprising: (a) a solid supported titanium tetrahalide complex, wherein said complex is prepared by contacting a mechanically pulverized solid support with titanium tetrahalide in the absence of mechanical pulverization, and (b) a cocatalyst comprising a mixture of a dialkyl aluminum halide and a dialkyl magnesium or alkyl lithium compound.
Inventors
- 👤 Robert Bacskai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:45
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/906
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
77 words
A process for the stereoregular polymerization of alpha olefins which comprises polymerizing an alpha olefin having from 2 to 8 carbon atoms in the presence of a catalyst comprising: (a) a solid supported titanium tetrahalide complex, wherein said complex is prepared by contacting a mechanically pulverized solid support with titanium tetrahalide in the absence of mechanical pulverization, and (b) a cocatalyst comprising a mixture of a dialkyl aluminum halide and a dialkyl magnesium or alkyl lithium compound.
Claim 2
Dependent Claim
77 words
A process for the stereoregular polymerization of alpha olefins which comprises polymerizing an alpha olefin having from 2 to 8 carbon atoms in the presence of a catalyst comprising: (a) a solid supported titanium tetrahalide complex, wherein said complex is prepared by contacting a mechanically pulverized solid support with titanium tetrahalide in the absence of mechanical pulverization, and (b) a cocatalyst comprising a mixture of a dialkyl aluminum halide and a dialkyl magnesium or alkyl lithium compound.
Claim 3
Dependent Claim
37 words
The process according to claim 1, wherein the polymerization is carried out at a temperature in the range of about 0° C. to 100° C. and a pressure in the range of about 3 to 16 atmospheres.
Claim 4
Dependent Claim
37 words
The process according to claim 2, wherein the polymerization is carried out at a temperature in the range of about 20° C. to 70° C. and a pressure in the range of about 5 to 10 atmospheres.
Claim 5
Dependent Claim
12 words
The process according to claim 1, wherein the alpha olefin is propylene.
Claim 6
Dependent Claim
12 words
The process according to claim 1, wherein the alpha olefin is 1-butene.
Claim 7
Dependent Claim
16 words
The process according to claim 1, wherein the dialkyl aluminum halide is a dialkyl aluminum chloride.
Claim 8
Dependent Claim
15 words
The process according to claim 6, wherein the dialkyl aluminum chloride is diethyl aluminum chloride.
Claim 9
Dependent Claim
14 words
The process according to claim 1, wherein the dialkyl magnesium compound is dibutyl magnesium.
Claim 10
Dependent Claim
14 words
The process according to claim 1, wherein the alkyl lithium compound is butyl lithium.
Claim 11
Dependent Claim
22 words
The process according to claim 1, wherein the molar ratio of aluminum to magnesium or aluminum to lithium is 1:5 to 5:1.
Claim 12
Dependent Claim
14 words
The process according to claim 1, wherein the cocatalyst further comprises a Lewis base.
Claim 13
Dependent Claim
16 words
The process according to claim 11, wherein the Lewis base is an aromatic carboxylic acid ester.
Claim 14
Dependent Claim
13 words
The process according to claim 12, wherein the Lewis base is ethyl benzoate.
Claim 15
Dependent Claim
26 words
The process according to claim 1, wherein the mechanically pulverized solid support comprises a magnesium dihalide, an aromatic carboxylic acid ester and an alcohol or phenol.
Claim 16
Dependent Claim
25 words
The process according to claim 1, wherein the the mechanically pulverized solid support comprises a magnesium dihalide, an aromatic carboxylic acid ester and silicon tetrachloride.
Claim 17
Dependent Claim
26 words
The process according to claim 14, wherein the titanium tetrahalide is titanium tetrachloride and the mechanically pulverized solid support comprises magnesium dichloride, ethyl benzoate and ethanol.
Claim 18
Dependent Claim
26 words
The process according to claim 14, wherein the titanium tetrahalide is titanium tetrachloride and the mechanically pulverized solid support comprises magnesium dichloride, ethyl benzoate and cresol.
Claim 19
Dependent Claim
27 words
The process according to claim 15, wherein the titanium tetrahalide is titanium tetrachloride and the mechanically pulverized solid support comprises magnesium dichloride, ethyl benzoate and silicon tetrachloride.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-14 | 1993-02-13 | 1993-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-14 | 1997-02-13 | 1997-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-14 | 2001-02-13 | 2001-08-15 | $7700.00 | Window Closed / Lapsed |