Patent US4154702A successfully refreshed from Google Patents.
US4154702A
Expired / Lapsed
US
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Polyolefin catalyst
Assignee: Mallinckrodt Chemical Inc
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Filing: 1978-05-22
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Granted: 1979-05-15
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Expires: 1998-05-22
Abstract
Abstract Phosphorus oxytrichloride modified titanium trichloride polymerization catalysts of improved efficiency and/or isotacticity are obtained when the modification reaction is carried out in the presence of methylene chloride.
Inventors
- 👤 John L. H. Allan
- 👤 Birendra K. Patnaik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
67 words
A process for modification of the titanium trichloride component of an olefin polymerization catalyst composition containing said titanium trichloride and an organoaluminum cocatalyst component, which process comprises: heating the titanium trichloride and phosphorus oxytrichloride in the presence of liquid methylene chloride but in the absence of the organoaluminum for at least 0.25 hours at a temperature in the range from about -20° C. to about 60° C.
Claim 2
Dependent Claim
67 words
A process for modification of the titanium trichloride component of an olefin polymerization catalyst composition containing said titanium trichloride and an organoaluminum cocatalyst component, which process comprises: heating the titanium trichloride and phosphorus oxytrichloride in the presence of liquid methylene chloride but in the absence of the organoaluminum for at least 0.25 hours at a temperature in the range from about -20° C. to about 60° C.
Claim 3
Dependent Claim
17 words
The process of claim 1 wherein the temperature is between about 30° C. and about 40° C.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein the reaction is carried out for a duration ranging between about 1 hour to about 4 hours.
Claim 5
Dependent Claim
29 words
The process according to claim 1, wherein the methylene chloride is present in quantities from about 1 cc to about 10 cc per gram of the titanium trichloride component.
Claim 6
Dependent Claim
29 words
The process according to claim 1, wherein the methylene chloride is present in quantities from about 2 cc to about 5 cc per gram of the titanium trichloride component.
Claim 7
Dependent Claim
28 words
The process according to claim 1 wherein the proportions of titanium trichloride and phosphorous oxytrichloride are selected to provide a Ti:P ratio between about 1:1 and about 100:1.
Claim 8
Dependent Claim
17 words
The process according to claim 6 wherein the Ti:P ratio ranges between about 2:1 and about 20:1.
Claim 9
Dependent Claim
17 words
The process according to claim 6 wherein the Ti:P ratio ranges between about 3:1 and about 10:1.
Claim 10
Dependent Claim
14 words
The process of claim 1 wherein the titanium trichloride is a violet titanium trichloride.
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein the titanium trichloride is a titanium trichloride - aluminum trichloride complex.
Claim 12
Dependent Claim
16 words
The process of claim 10, wherein the complex has the formula 3TiCl 3 .AlCl 3 .
Claim 13
Dependent Claim
42 words
A process for the preparation of an olefin polymerization catalyst composition which comprises adding an organoaluminum compound selected from the group consisting of trialkyl aluminum, dialkyl aluminum halide and mixtures thereof to the titanium trichloride modified by the process of claim 1.
Claim 14
Dependent Claim
20 words
The process of claim 12 wherein the alkyl groups of the organoaluminum compound have from 2 to 8 carbon atoms.
Claim 15
Dependent Claim
24 words
The process of claim 12, wherein the organoaluminum compound is selected from the group consisting of triethyl aluminum, diethyl aluminum chloride and mixtures thereof.
References Cited (Backward Citations)
US4095016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |