Patent US3974237A successfully refreshed from Google Patents.
US3974237A
Expired / Lapsed
US
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Block copolymer processes
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1975-02-21
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Granted: 1976-08-10
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Expires: 1995-02-21
Abstract
Abstract A process for the copolymerization of alpha-olefins to form a block olefinic copolymer. In these processes solid polymeric alpha-olefin which contains an active catalyst is fed into two parallel fluid-bed reactors and concurrently, two different, gaseous, olefinic monomer streams are cyclically fed into first one reactor and then the other. The block olefinic copolymer is continuously withdrawn from the reactors during the cyclic injection thereinto.
Inventors
- 👤 Kenneth H. Brumbaugh
- 👤 James J. McAlpin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:55
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08F297/08; Y; Y10; Y10S; Y10S525/00; Y10S525/91
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
A process for the copolymerization of alpha-olefins which comprises the steps of (a) feeding a solid polymeric alpha-olefin which contains an active catalyst into two parallel fluid-bed reactors, a first reactor and a second reactor; (b) concurrently injecting into said first reactor a first olefinic gaseous monomer stream and injecting into said second reactor a second different olefinic gaseous monomer stream for a predetermined period of time; (c) terminating said streams to said first and second reactors; (d) injecting said first and second streams into respectively the second and first reactors for a predetermined period of time; (e) continuously repeating steps (b), (c) and (d) on a cyclic basis in order to produce a block olefinic copolymer therein; and (f) concurrently withdrawing said block olefinic copolymer from said reactors during said cyclic injections.
Claim 2
Dependent Claim
133 words
A process for the copolymerization of alpha-olefins which comprises the steps of (a) feeding a solid polymeric alpha-olefin which contains an active catalyst into two parallel fluid-bed reactors, a first reactor and a second reactor; (b) concurrently injecting into said first reactor a first olefinic gaseous monomer stream and injecting into said second reactor a second different olefinic gaseous monomer stream for a predetermined period of time; (c) terminating said streams to said first and second reactors; (d) injecting said first and second streams into respectively the second and first reactors for a predetermined period of time; (e) continuously repeating steps (b), (c) and (d) on a cyclic basis in order to produce a block olefinic copolymer therein; and (f) concurrently withdrawing said block olefinic copolymer from said reactors during said cyclic injections.
Claim 3
Dependent Claim
26 words
The process as set forth in claim 1 wherein the fluidized bed temperatures are in the range of from about 110° F. to about 210° F.
Claim 4
Dependent Claim
23 words
The process as set forth in claim 1 wherein the composition of said first gaseous stream is a mixture of ethylene and propylene.
Claim 5
Dependent Claim
19 words
The process as set forth in claim 1 wherein the composition of said second gaseous stream is substantially propylene.
Claim 6
Dependent Claim
19 words
The process as set forth in claim 1 wherein the composition of said second gaseous stream is substantially ethylene.
Claim 7
Dependent Claim
24 words
The process as set forth in claim 1 wherein the composition of said first and second gaseous streams also contain an inert carrier gas.
Claim 8
Dependent Claim
24 words
The process as set forth in claim 1 wherein the composition of said first and second gaseous streams also contain a chain transfer agent.
Claim 9
Dependent Claim
26 words
The process as set forth in claim 1 wherein the cyclic injection time for said gaseous streams is from about 1 second to about 4 hours.
Claim 10
Dependent Claim
23 words
The process as set forth in claim 1 wherein the pressure of said reactors is from about 20 p.s.i.g. to about 200 p.s.i.g.
Claim 11
Dependent Claim
34 words
The process as set forth in claim 1 wherein the active catalyst is a Ziegler catalyst consisting of a composition of TiCl 3 and AlCl 3 , and a co-catalyst consisting of diethylaluminum monochloride.
References Cited (Backward Citations)
US3798288A
Cited
US3853969A
Cited
GB1006469A
Cited
US3442978A
Cited
US3719643A
Cited
US3780136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |