Patent US4560733A successfully refreshed from Google Patents.
US4560733A
Expired / Lapsed
US
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Polymerization and catalyst
Assignee: Phillips Petroleum Co
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Filing: 1984-10-01
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Granted: 1985-12-24
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Expires: 2004-10-01
Abstract
Abstract Polymerization of olefins in the presence of a catalyst system comprising titanium-coating component (A) associated with a milled blend of at least two different silica-containing components having different MI (polymer melt index) potentials and a dihydrocarbylmagnesium compound, and a cocatalyst component (B) comprising an organoaluminum compound. Ethylene polymers having broad molecular weight distribution are obtained using the catalyst defined herein.
Inventors
- 👤 Shirley J. Martin nee Sturdy
- 👤 Max P. McDaniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:15
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A method of producing a polymerization catalyst which comprises forming a component (A) by: (1) contacting a first silica activated by calcining at a temperature in the range of about 600° to 900° C. and having a pore volume ranging from 1.5 to about 3 cc/g and surface area ranging from about 100 to about 300 m 2 /g with dialkylmagnesium and TiCl 4 , (2) contacting a second silica activated by calcining at a temperature of about 100° to about 500° C. and having a pore volume of from about 0.3 to about 1 cc/g and a surface area ranging from about 400 to about 900 m 2 /g with dialkylmagnesium and TiCl 4 , (3) blending about equal amounts of said first and second silicas and subjecting the resulting blend to milling to form component (A), and (4) combining component (A) formed in step (3) with a cocatalyst component (B) comprising trialkylaluminum.
Claim 2
Independent Claim
154 words
A method of producing a polymerization catalyst which comprises forming a component (A) by: (1) contacting a first silica activated by calcining at a temperature in the range of about 600° to 900° C. and having a pore volume ranging from 1.5 to about 3 cc/g and surface area ranging from about 100 to about 300 m 2 /g with dialkylmagnesium and TiCl 4 , (2) contacting a second silica activated by calcining at a temperature of about 100° to about 500° C. and having a pore volume of from about 0.3 to about 1 cc/g and a surface area ranging from about 400 to about 900 m 2 /g with dialkylmagnesium and TiCl 4 , (3) blending about equal amounts of said first and second silicas and subjecting the resulting blend to milling to form component (A), and (4) combining component (A) formed in step (3) with a cocatalyst component (B) comprising trialkylaluminum.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said dialkylmagnesium is dibutylmagnesium and said trialkylaluminum is triisobutylaluminum.
Claim 4
Dependent Claim
27 words
A process for the production of ethylene polymers having broad molecular weight distribution which comprises contacting ethylene under polymerization conditions with the catalyst produced by claim 1.
Claim 5
Independent Claim
146 words
A method of producing a polymerization catalyst which comprises forming a component (A) by: (1) blending about equal parts of a first silica activated by calcining at a temperature of about 600° to about 900° C. and having a pore volume of from about 1.5 to about 3 cc/g and a surface area ranging from about 100 to about 300 m 2 /g with a second silica activated by calcining at a temperature of about 100° to about 500° C. and having a pore volume of from about 0.3 to about 1 cc/g and a surface area ranging from about 400 to about 900 m 2 /g and subjecting the resulting blend to milling, (2) contacting the milled blend of (1) with dialkylmagnesium and TiCl 4 to form component (A), and (3) combining component (A) formed in step (2) with a cocatalyst component (B) comprising trialkylaluminum.
Claim 6
Independent Claim
146 words
A method of producing a polymerization catalyst which comprises forming a component (A) by: (1) blending about equal parts of a first silica activated by calcining at a temperature of about 600° to about 900° C. and having a pore volume of from about 1.5 to about 3 cc/g and a surface area ranging from about 100 to about 300 m 2 /g with a second silica activated by calcining at a temperature of about 100° to about 500° C. and having a pore volume of from about 0.3 to about 1 cc/g and a surface area ranging from about 400 to about 900 m 2 /g and subjecting the resulting blend to milling, (2) contacting the milled blend of (1) with dialkylmagnesium and TiCl 4 to form component (A), and (3) combining component (A) formed in step (2) with a cocatalyst component (B) comprising trialkylaluminum.
Claim 7
Dependent Claim
16 words
A method according to claim 4 wherein said dialkylmagnesium is dibutylmagnesium and said trialkylaluminum is triisobutylaluminum.
Claim 8
Dependent Claim
27 words
A process for the production of ethylene polymers having broad molecular weight distribution which comprises contacting ethylene under polymerization conditions with the catalyst produced by claim 4.
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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) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |