Patent US2808261A successfully refreshed from Google Patents.
US4232140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing olefins
Assignee: USI CHEMICALS Co Inc
•
Filing: 1978-10-23
•
Granted: 1980-11-04
•
Expires: 1998-10-23
Abstract
Abstract Trichlorofluoromethane is used as a promoter in the polymerization and copolymerization of ethylene with supported Ziegler-type vanadium compound/alkylaluminum compound catalysts in the presence of hydrogen. The use of the promoter leads to the formation of non-rubbery, semi-crystalline polymers in high yields, does not alter the basic molecular weight distribution of the polymers, permits independent control of molecular weight by hydrogen, and imparts no significant level of halogen to the product.
Inventors
- 👤 Morris R. Ort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:54
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02; Y; Y10; Y10S; Y10S526/00; Y10S526/901
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
81 words
In a process for preparing non-rubbery, semicrystalline polymers and copolymers by contacting an ethylene-containing stream with a supported catalyst comprising (a) a vanadium chloride and (b) at least one alkylaluminum compound of the formula R n Al(OR) 3-n , wherein R is an alkyl group containing 1-12 carbons and n is 0.5-3.0, on (c) an anhydrous inert inorganic support material under gas-phase polymerization conditions in the presence of hydrogen, the improvement which comprises conducting the polymerization in the presence of trichlorofluoromethane.
Claim 2
Dependent Claim
81 words
In a process for preparing non-rubbery, semicrystalline polymers and copolymers by contacting an ethylene-containing stream with a supported catalyst comprising (a) a vanadium chloride and (b) at least one alkylaluminum compound of the formula R n Al(OR) 3-n , wherein R is an alkyl group containing 1-12 carbons and n is 0.5-3.0, on (c) an anhydrous inert inorganic support material under gas-phase polymerization conditions in the presence of hydrogen, the improvement which comprises conducting the polymerization in the presence of trichlorofluoromethane.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein ethylene is the only monomer in the ethylene-containing stream.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the ethylene-containing stream also contains an alpha-olefin containing 3-8 carbons.
Claim 5
Dependent Claim
42 words
The process of claim 1 wherein the catalyst is supported on silica gel which has been treated with an alkylaluminum compound of the formula R n Al(OR) 3-n , wherein R is an alkyl group containing 1-12 carbons and n is 0.5-3.0.
Claim 6
Dependent Claim
26 words
The process of claim 4 wherein the catalyst comprises vanadium oxytrichloride, ethylaluminum diethoxide, and triethylaluminum, and the silica gel support has been treated with ethylaluminum diethoxide.
Claim 7
Dependent Claim
36 words
The process of claim 1 wherein the catalyst comprises vanadium oxytrichloride and triethylaluminum on a silica gel support and has been prepared by reacting silica gel with triethylaluminum and reacting the resultant product with vanadium oxytrichloride.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the mol ratio of trichlorofluoromethane to vanadium is in the range of about 1-5000/1.
Claim 9
Dependent Claim
11 words
The process of claim 7 wherein the ratio is about 40-1500/1.
References Cited (Backward Citations)
US3354139A
Cited
US3051690A
Cited
US3349064A
Cited
US3301834A
Cited
GB1059865A
Cited
US3622548A
Cited
US3772261A
Cited
US3718635A
Cited
US3784539A
Cited
US3956255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-04 | 1984-05-05 | 1984-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-04 | 1988-05-05 | 1988-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-04 | 1992-05-05 | 1992-11-04 | $7700.00 | Window Closed / Lapsed |