US4025707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed hydrocarbyloxide treated catalyst activated at different temperatures
Assignee: Phillips Petroleum Co
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Filing: 1976-02-25
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Granted: 1977-05-24
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Expires: 1996-02-25
Abstract
Abstract Ethylene homopolymers and copolymers are made in a particle form process over a mixed catalyst comprising several portions of the same or different supported chromium components and metal promoted variations thereof in which each portion is activated at a different temperature, thereafter combined, and the composite, or each activated portion before being combined, is post treated with a hydrocarbyl aluminum hydrocarbyloxide. Broad molecular weight polymers are produced having excellent die swell characteristics and acceptable environmental stress cracking resistance and flow properties; this is achieved and while at the same time realizing high productivities.
Inventors
- 👤 John P. Hogan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:26
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
187 words
A process which comprises: contacting at least one polymerizable olefin under polymerization conditions with a mixed catalyst produced by activating in dry air at least one first supported chromium oxide portion at a first temperature within the range of 500° to 1100° F.; activating in dry air at least one second supported chromium oxide portion at a second temperature within the range of 1200° to 2000° F., said second temperature further being at least 200° F. above said first temperature; said activating being sufficient to convert at least a portion of the chromium to the hexavalent state; thereafter combining said thus activated first and second portions to form a composite, the weight ratio of said first portion to said second portion being within the range of 1:6 to 12:6, and treating thus formed composite or said activated portions prior to combination with from 0.5 to 10 weight percent, based on the weight of said composite of a hydrocarbyl aluminum hydrocarbyloxide, said contacting being carried out in a liquid diluent at a temperature such that at least a substantial part of polymer produced is insoluble in said diluent.
Claim 2
Dependent Claim
187 words
A process which comprises: contacting at least one polymerizable olefin under polymerization conditions with a mixed catalyst produced by activating in dry air at least one first supported chromium oxide portion at a first temperature within the range of 500° to 1100° F.; activating in dry air at least one second supported chromium oxide portion at a second temperature within the range of 1200° to 2000° F., said second temperature further being at least 200° F. above said first temperature; said activating being sufficient to convert at least a portion of the chromium to the hexavalent state; thereafter combining said thus activated first and second portions to form a composite, the weight ratio of said first portion to said second portion being within the range of 1:6 to 12:6, and treating thus formed composite or said activated portions prior to combination with from 0.5 to 10 weight percent, based on the weight of said composite of a hydrocarbyl aluminum hydrocarbyloxide, said contacting being carried out in a liquid diluent at a temperature such that at least a substantial part of polymer produced is insoluble in said diluent.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein said olefin is at least one aliphatic mono-1-olefin having 2-8 carbon atoms per molecule.
Claim 4
Dependent Claim
19 words
A method according to claim 2 wherein said olefin is ethylene, and said polymer thus produced is ethylene homopolymer.
Claim 5
Dependent Claim
33 words
A method according to claim 2 wherein said contacting is carried out at a temperature within the range of 150° to 230° F. and substantially all of said polymer is in particle form.
Claim 6
Dependent Claim
25 words
A method according to claim 2 wherein said diluent is a paraffin or cycloparaffin or mixture thereof having 3 to 12 carbon atoms per molecule.
Claim 7
Dependent Claim
24 words
A method according to claim 2 wherein said diluent is selected from the group consisting of propane, isobutane, cyclohexane, normal dodecane, and methyl cyclohexane.
Claim 8
Dependent Claim
11 words
A method according to claim 2 wherein said diluent is isobutane.
Claim 9
Dependent Claim
37 words
A method according to claim 2 wherein said polymer thus produced is a copolymer selected from the group consisting of ethylene/propylene, ethylene/1-butene, ethylene/1-hexene, and ethylene/1-octene wherein 80 to 99 mole percent of polymer is a polymerized ethylene.
Claim 10
Dependent Claim
32 words
A method according to claim 2 wherein said first temperature is within the range of 700° to 1000° F. and said second temperature is within the range of 1300° to 1600° F.
Claim 11
Dependent Claim
16 words
A method according to claim 2 wherein said hydrocarbyl aluminum hydrocarbyloxide is a dialkyl aluminum alkoxide.
Claim 12
Dependent Claim
26 words
A method according to claim 7 wherein a weight ratio of said first portion to said second portion is within the range of 1:3 to 1:1.
Claim 13
Dependent Claim
45 words
A method according to claim 11 wherein said hydrocarbyl aluminum hydrocarbyloxide is selected from the group consisting of diphenylaluminum phenoxide, p-tolylaluminum dibutoxide, di-n-propylaluminum methylcyclohexoxide, isobutylaluminum diisobutoxide, dimethylaluminum methoxide, diethylaluminum ethoxide, diethylaluminum n-propoxide, diethylaluminum t-butoxide, diisobutylaluminum isobutoxide, di-n-propylaluminum n-propoxide, di-2-methylpentylaluminum ethoxide, dimethylaluminum decanoxide, and diethylaluminum phenoxide.
Claim 14
Dependent Claim
14 words
A method according to claim 11 wherein said hydrocarbyl aluminum hydrocarbyloxide is diethylaluminum ethoxide.
Claim 15
Dependent Claim
19 words
A method according to claim 11 wherein said chromium oxide in each portion is supported on a precipitated silica.
Claim 16
Dependent Claim
25 words
A method according to claim 14 wherein said chromium oxide in at least one portion is supported on a silica coprecipitated with a titanium compound.
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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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |