US3679775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Olefin polymerization process and catalyst
Assignee: Eastman Kodak Co
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Filing: 1968-04-03
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Granted: 1972-07-25
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Expires: 1988-04-03
Abstract
Abstract Process for polymerizing alpha-olefins employing a catalyst comprising organopolylithiumalumaluminum compound prepared by reacting lithium compounds selected from the group consisting of lithium hydride and lithium alkyl with at least one aluminum compound selected from the group consisting of aluminum trialkyl and dialkyl aluminum hydride, an alkyl compound selected from the group consisting of lithium alkyl, aluminum trialkyl and dialkyl aluminum hydride and the alpha form of TiCl3. This combination provides a catalyst for commercial processes which can be operated at temperatures above 140* C. over extended periods of time.
Inventors
- 👤 Hugh J Hagemeyer Jr
- 👤 Vernon K Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:30
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
20 words
The process of claim 1 wherein said solid organopolylithiumaluminum compound is the reaction product of lithium alkyl and aluminum trialkyl.
Claim 2
Dependent Claim
19 words
The process of claim 2 wherein each alkyl radical of said aluminum trialkyl contains one to 12 carbon atoms.
Claim 3
Dependent Claim
13 words
The process according to claim 3 wherein said aluminum trialkyl is triethyl aluminum.
Claim 4
Dependent Claim
12 words
The process of claim 4 wherein said lithium alkyl is lithium butyl.
Claim 5
Dependent Claim
12 words
The process of claim 5 wherein said alkyl compound is lithium alkyl.
Claim 6
Dependent Claim
12 words
The process of claim 1 wherein said lithium alkyl is lithium butyl.
Claim 7
Dependent Claim
13 words
The process of claim 7 wherein propylene is polymerized to highly crystallizable polypropylene.
Claim 8
Dependent Claim
28 words
The process of claim 7 wherein propylene and ethylene are polymerized to form an ethylene/propylene block copolymer containing both crystallizable polymerized propylene segments and crystallizable polyMerized ethylene segments.
Claim 9
Dependent Claim
20 words
The process of claim 1 wherein said organopolylithiumaluminum compound is the reaction product of lithium alkyl and dialkyl aluminum hydride.
Claim 10
Dependent Claim
20 words
The process of claim 10 wherein each alkyl radical of the dialkyl aluminum hydride contains one to 12 carbon atoms.
Claim 11
Dependent Claim
15 words
The process according to claim 11 wherein said dialkyl aluminum hydride is diisobutyl aluminum hydride.
Claim 12
Dependent Claim
12 words
The process of claim 12 wherein said alkyl compound is lithium alkyl.
Claim 13
Dependent Claim
12 words
The process of claim 12 wherein said alkyl compound is aluminum trialkyl.
Claim 14
Dependent Claim
13 words
The process of claim 12 wherein said alkyl compound is dialkyl aluminum hydride.
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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |