US4287327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for controlling polymer particle size in vapor phase polymerization
Assignee: BP Corp North America Inc
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Filing: 1980-09-29
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Granted: 1981-09-01
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Expires: 2000-09-29
Abstract
Abstract A process for controlling polymer particle size distribution in the vapor phase polymerization of olefins comprises contacting fresh catalyst with a stream of wetting liquid before the catalyst is dispersed in the polymer bed, said wetting liquid being introduced at a wetting liquid flux density greater than about 20.
Inventors
- 👤 Glenn O. Michaels
- 👤 Michael J. Spangler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:33
CPC Classifications
C; C08; C08F; C08F10/00; Y; Y10; Y10S; Y10S526/00; Y10S526/901; Y10S526/903; Y10S526/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
63 words
In a process for the continuous vapor phase polymerization of at least one olefin utilizing a polymerization catalyst which is charged to an existing bed of polymer particles the improvement comprising contacting said catalyst with a stream of wetting liquid before said catalyst is dispersed in said bed, said wetting liquid being introduced at a wetting liquid flux density greater than about 20.
Claim 2
Dependent Claim
63 words
In a process for the continuous vapor phase polymerization of at least one olefin utilizing a polymerization catalyst which is charged to an existing bed of polymer particles the improvement comprising contacting said catalyst with a stream of wetting liquid before said catalyst is dispersed in said bed, said wetting liquid being introduced at a wetting liquid flux density greater than about 20.
Claim 3
Dependent Claim
18 words
The process of claim 1 wherein said vapor phase polymerization is carried out in a horizontal, stirred-bed reactor.
Claim 4
Dependent Claim
23 words
The process of claim 1 wherein said unsaturated monomer is selected from the group consisting of ethane, propene, butene-1, hexene-1 and mixtures thereof.
Claim 5
Dependent Claim
38 words
The process of claim 2 wherein said unsaturated monomer is ethene and from 0.0 to 20.0 mole percent propene and said wetting liquid is selected from the group consisting essentially of propane, butane, pentane, isopentane, and mixtures thereof.
Claim 6
Dependent Claim
39 words
The process of claim 2 wherein said unsaturated monomer is ethene and from 0.1 to about 20 mole percent butene-1 and said wetting liquid is selected from the group consisting essentially of propane, butane, pentane, isopentane, and mixtures thereof.
Claim 7
Dependent Claim
19 words
The process of claim 2 wherein said unsaturated monomer is propene and said wetting liquid consists essentially of propene.
Claim 8
Dependent Claim
28 words
The process of claim 2 wherein said unsaturated monomer is propene and from 0.1 to about 20.0 mole percent ethene and said wetting liquid consists essentially of propene.
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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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |