US5310834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mixed chromium catalysts and polymerizations utilizing same
Assignee: Equistar Chemicals LP
•
Filing: 1992-12-16
•
Granted: 1994-05-10
•
Expires: 2012-12-16
Abstract
Abstract Mixed catalyst compositions comprised of a first supported chromium-containing catalyst component and a second supported chromium-containing catalyst component and which additionally have one or more metallic or non-metallic catalytic agents associated therewith are provided. The additional metallic or non-metallic elements associated with the catalyst components can be aluminum, titanium, zirconium, boron, phosphorous or combinations thereof. The pore volume of the silica supports used for the first and second catalyst components differs by at least 0.3 cc/g. The mixed catalyst compositions of the invention are useful for the preparation of polyolefins. They are particularly useful of polymerization of ethylene in particle form polymerizations to produce high density polyethylene blow molding resins having good processability and physical properties. The improved particle form polymerization process and products obtained thereby using the above-described mixed catalyst compositions are also described.
Inventors
- 👤 Stanley J. Katzen
- 👤 Thomas J. Pullukat
- 👤 Michael W. Lynch
- 👤 Louis J. Rekers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:31
CPC Classifications
C; C08; C08F; C08F10/00; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
161 words
In a process for the particle form polymerization of ethylene, to produce high density resins useful for blow molding having broadened molecular weight distributions, the improvement comprising conducting the polymerization in the presence of a mixed catalyst consisting essentially of first and second silica-supported chromium catalyst components present at a weight ratio from 10:1 to 1:10 and each component containing from 0.1 to 2.0 weight percent chromium and thermally activated by heating in a non-reducing atmosphere at a temperature from 450° F. to 1700° F.; at least one of said catalyst components containing an additional metallic or non-metallic element selected from aluminum, titanium, zirconium, boron or phosphorus, the silica support of said first catalyst component having a pore volume from 1.7 to 3.1 cc/g, the silica support of said second catalyst component having a pore volume from 1.0 to 2.0 cc/g, and the silica supports of said first and second catalyst components differing in pore volume by at least 0.3 cc/g.
Claim 2
Dependent Claim
161 words
In a process for the particle form polymerization of ethylene, to produce high density resins useful for blow molding having broadened molecular weight distributions, the improvement comprising conducting the polymerization in the presence of a mixed catalyst consisting essentially of first and second silica-supported chromium catalyst components present at a weight ratio from 10:1 to 1:10 and each component containing from 0.1 to 2.0 weight percent chromium and thermally activated by heating in a non-reducing atmosphere at a temperature from 450° F. to 1700° F.; at least one of said catalyst components containing an additional metallic or non-metallic element selected from aluminum, titanium, zirconium, boron or phosphorus, the silica support of said first catalyst component having a pore volume from 1.7 to 3.1 cc/g, the silica support of said second catalyst component having a pore volume from 1.0 to 2.0 cc/g, and the silica supports of said first and second catalyst components differing in pore volume by at least 0.3 cc/g.
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein the weight ratio of the first and second catalyst components is from 5:1 to 1:5 and the metallic or non-metallic element is present in an amount from 0.1 to 6.0 weight percent.
Claim 4
Dependent Claim
29 words
The process of claim 2 wherein the first catalyst component contains 0.5 to 1.2 weight percent chromium and the second catalyst component contains 0.75 to 1.25 weight percent chromium.
Claim 5
Dependent Claim
19 words
The process of claim 3 wherein the catalyst contains from 2 to 4.5 weight percent aluminum, titanium or zirconium.
Claim 6
Dependent Claim
18 words
The process of claim 4 wherein the catalyst contains from 0.2 to 1.0 weight percent phosphorous or boron.
Claim 7
Dependent Claim
30 words
The process of claim 5 wherein the mixed catalysts is heated in a reducing atmosphere of nitrogen and carbon monoxide at 575° F. to 1650° F. prior to thermal activation.
Claim 8
Dependent Claim
38 words
The process of claim 6 wherein the mixed catalyst is combined with a metallic or non-metallic reducing agent and the molar ratio of the metal or non-metal of said reducing agent to chromium ranges from 0.01:1 to 5:1.
Claim 9
Dependent Claim
41 words
The process of claim 7 wherein the metallic or non-metallic reducing agent is selected from the group consisting of trialkyl aluminums, alkyl aluminum halides, alkyl aluminum alkoxides, dialkyl zincs, dialkyl magnesiums, alkali metal borohydrides, aluminum borohydrides, alkyl boranes, and boron hydrides.
Claim 10
Dependent Claim
11 words
The process of claim 8 wherein the reducing agent is triethylborane.
Claim 11
Dependent Claim
27 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium and aluminum and a second catalyst component containing chromium.
Claim 12
Dependent Claim
28 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium, aluminum and phosphorus and a second catalyst component containing chromium.
Claim 13
Dependent Claim
30 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium, aluminum and phosphorus and a second catalyst component containing chromium and boron.
Claim 14
Dependent Claim
28 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium, aluminum and phosphorus and a second catalyst component containing titanium.
Claim 15
Dependent Claim
28 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium, aluminum and phosphorus and a second catalyst component containing zirconium.
Claim 16
Dependent Claim
27 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium and titanium and a second catalyst component containing chromium.
Claim 17
Dependent Claim
29 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium and titanium and a second catalyst component containing chromium and aluminum.
Claim 18
Dependent Claim
29 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium and titanium and a second catalyst component containing chromium and boron.
Claim 19
Dependent Claim
28 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium, titanium and phosphorus and a second catalyst component containing chromium.
Claim 20
Dependent Claim
27 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium and zirconium and a second catalyst component containing chromium.
Claim 21
Dependent Claim
29 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium and zirconium and a second catalyst component containing chromium and aluminum.
Claim 22
Dependent Claim
28 words
The process of claim 7 wherein the mixed catalyst is comprised of a first catalyst component containing chromium, zirconium and phosphorus and a second catalyst component containing chromium.
References Cited (Backward Citations)
US3453077A
Cited
US3622521A
Cited
US3652215A
Cited
US3652214A
Cited
US3652216A
Cited
US3644323A
Cited
US3985676A
Cited
US4025707A
Cited
US3959178A
Cited
US4184028A
Cited
US4049896A
Cited
US3984351A
Cited
US4192775A
Cited
US4041224A
Cited
US4593079A
Cited
US4295997A
Cited
US4369295A
Cited
US4263422A
Cited
US4496699A
Cited
US4380616A
Cited
US4454242A
Cited
US4564660A
Cited
US4806513A
Cited
US4640964A
Cited
US4560733A
Cited
US4540757A
Cited
US4981927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-09 | 1997-11-08 | 1998-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-09 | 2001-11-08 | 2002-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-09 | 2005-11-08 | 2006-05-10 | $7700.00 | Window Closed / Lapsed |