Patent US4011382A successfully refreshed from Google Patents.
US4011382A
Expired / Lapsed
US
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Preparation of low and medium density ethylene polymer in fluid bed reactor
Assignee: Union Carbide Corp
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Filing: 1975-03-10
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Granted: 1977-03-08
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Expires: 1995-03-10
Abstract
Abstract A supported catalyst is used in the low pressure catalytic copolymerization of ethylene with C 3 to C 6 α-olefins in a fluid bed reactor to produce polymers having a density of less than 0.941 and a melt index of >0.0 to at least about 2.0. The supported catalyst contains about 0.05 to 3.0 weight % of chromium, about 1.5 to 9.0 weight % of titanium and >0.0 to about 2.5 weight % of fluorine.
Inventors
- 👤 Isaac J. Levine
- 👤 Frederick J. Karol
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:45
CPC Classifications
C; C08; C08F; C08F210/00; C08F210/16; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
165 words
A process for producing solid ethylene polymers having a density of less than 0.941 and a melt index of >0.0 to at least about 2.0 under relatively low pressure conditions which comprises copolymerizing ethylene with sufficient quantities of C 3 to C 6 α-olefin monomer to provide the desired density in the copolymer product in a fluid bed process at a temperature of about 30° to 105° C., under a pressure of less than about 1000 psi, and under a mass gas flow rate of about 1.5 to 10 times G mf by contacting the monomers with fluidized particles of a supported catalyst wherein said particles have an average diameter of about 50 to 200 microns said supported catalyst having been activated in air or oxygen at a temperature of about 300° to 900° C., and comprising, based on the total weight of the support and the catalyst, about 0.05 to 3.0 weight percent of chromium, about 1.5 to 9.0 weight percent of titanium, and
Claim 2
Dependent Claim
165 words
A process for producing solid ethylene polymers having a density of less than 0.941 and a melt index of >0.0 to at least about 2.0 under relatively low pressure conditions which comprises copolymerizing ethylene with sufficient quantities of C 3 to C 6 α-olefin monomer to provide the desired density in the copolymer product in a fluid bed process at a temperature of about 30° to 105° C., under a pressure of less than about 1000 psi, and under a mass gas flow rate of about 1.5 to 10 times G mf by contacting the monomers with fluidized particles of a supported catalyst wherein said particles have an average diameter of about 50 to 200 microns said supported catalyst having been activated in air or oxygen at a temperature of about 300° to 900° C., and comprising, based on the total weight of the support and the catalyst, about 0.05 to 3.0 weight percent of chromium, about 1.5 to 9.0 weight percent of titanium, and
Claim 3
Dependent Claim
23 words
>0. 0 to about 2.5 weight percent of fluorine, said chromium and said titanium being in the form of oxides after said activation.
Claim 4
Dependent Claim
23 words
>0. 0 to about 2.5 weight percent of fluorine, said chromium and said titanium being in the form of oxides after said activation.
Claim 5
Dependent Claim
20 words
A process as in claim 1 for producing solid ethylene polymers having a melt index of about 0.1 to 1.0.
Claim 6
Dependent Claim
19 words
A process as in claim 2 for producing solid ethylene polymers having a density of about 0.900 to 0.925.
Claim 7
Dependent Claim
19 words
A process as in claim 2 for producing solid ethylene polymers having a density of about 0.926 to 0.940.
Claim 8
Dependent Claim
14 words
A process as in claim 1 for producing solid copolymers of ethylene and propylene.
Claim 9
Dependent Claim
14 words
A process as in claim 1 for producing solid copolymers of ethylene and butene-1.
Claim 10
Dependent Claim
14 words
A process as in claim 1 for producing solid copolymers of ethylene and hexane-1.
Claim 11
Dependent Claim
45 words
A process as in claim 1 for producing solid ethylene polymers at a temperature of about 85° to 100° C., under a pressure of about 200 to 350 psi and under a mass gas flow rate of about 3 to 6 times G mf .
Claim 12
Dependent Claim
36 words
A process as in claim 8 in which said catalyst comprises about 0.2 to 1.0 weight percent of chromium, about 4 to 7 weight percent of titanium, and about 0.1 to 1.0 weight percent of fluorine.
Claim 13
Dependent Claim
12 words
A process as in claim 9 in which said support comprises silica.
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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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |