US4135046A
Expired / Lapsed
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High efficiency catalysts for olefin polymerization
Assignee: Millennium Petrochemicals Inc
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Filing: 1977-02-28
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Granted: 1979-01-16
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Expires: 1997-02-28
Abstract
Abstract A unique high efficiency catalyst has been developed for the polymerization of ethylene. The activity of the catalyst, which uses a mixed magnesium-aluminum alkyl as a reducing agent for tetrabutyltitanate, and hydrogen chloride to deactivate excess reducing agent, is dependent on a specific and unpredicted order of addition of catalyst components.
Inventors
- 👤 James J. Harris
- 👤 Richard E. Hammond
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:21
CPC Classifications
C; C08; C08F; C08F110/00; C08F110/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
A catalyst for the polymerization of ethylene consisting essentially of the product from the steps of (1) reducing a first increment of tetrabutyltitanate with a mixed magnesium-aluminum alkyl of formula R 2 Mg.2AlR' 3 , where R and R' may be the same or different alkyl groups having from 1 to 20 carbon atoms; (2) adding hydrogen chloride to the reaction product from (1) in an amount of about 2 moles of chloride per mole of mixed magnesium aluminum alkyl to deactivate any excess magnesium alkyl; and (3) adding a second increment of tetrabutyltitanate; said first and second increments of tetrabutyltitanate being selected such that the mole ratio of first to second increments is between 6:1 and 0.33:1; and said mixed magnesium alkyl being added in step (1) in an amount such that the mole ratio of magnesium alkyl to total titanate is between 50:1 and 350:1.
Claim 2
Dependent Claim
147 words
A catalyst for the polymerization of ethylene consisting essentially of the product from the steps of (1) reducing a first increment of tetrabutyltitanate with a mixed magnesium-aluminum alkyl of formula R 2 Mg.2AlR' 3 , where R and R' may be the same or different alkyl groups having from 1 to 20 carbon atoms; (2) adding hydrogen chloride to the reaction product from (1) in an amount of about 2 moles of chloride per mole of mixed magnesium aluminum alkyl to deactivate any excess magnesium alkyl; and (3) adding a second increment of tetrabutyltitanate; said first and second increments of tetrabutyltitanate being selected such that the mole ratio of first to second increments is between 6:1 and 0.33:1; and said mixed magnesium alkyl being added in step (1) in an amount such that the mole ratio of magnesium alkyl to total titanate is between 50:1 and 350:1.
Claim 3
Independent Claim
144 words
A method for the preparation of a catalyst for the polymerization of ethylene which comprises (1) reducing a first increment of tetrabutyltitanate with a mixed magnesium-aluminum alkyl of formula R 2 Mg.2AlR' 3 , where R and R' may be the same or different alkyl groups having 1 to 20 carbon atoms; (2) deactivating any excess magnesium alkyl by adding hydrogen chloride in an amount of about 2 moles of chloride per mole of mixed magnesium-aluminum alkyl to react with the alkyl compound; and (3) adding a second increment of tetrabutyltitanate; said first and second increments of tetrabutyltitanate being selected such that the mole ratio of first to second increments is between 6:1 and 0.33:1; and said mixed magnesium alkyl being added in step (1) in an amount such that the mole ratio of magnesium alkyl to total titanate is between 50:1 and 350:1.
Claim 4
Independent Claim
144 words
A method for the preparation of a catalyst for the polymerization of ethylene which comprises (1) reducing a first increment of tetrabutyltitanate with a mixed magnesium-aluminum alkyl of formula R 2 Mg.2AlR' 3 , where R and R' may be the same or different alkyl groups having 1 to 20 carbon atoms; (2) deactivating any excess magnesium alkyl by adding hydrogen chloride in an amount of about 2 moles of chloride per mole of mixed magnesium-aluminum alkyl to react with the alkyl compound; and (3) adding a second increment of tetrabutyltitanate; said first and second increments of tetrabutyltitanate being selected such that the mole ratio of first to second increments is between 6:1 and 0.33:1; and said mixed magnesium alkyl being added in step (1) in an amount such that the mole ratio of magnesium alkyl to total titanate is between 50:1 and 350:1.
Claim 5
Independent Claim
176 words
A method for the polymerization of ethylene comprising subjecting ethylene to a temperature of from 0 ° to 150° C. at pressures of from 1 to 50 atmospheres in an inert hydrocarbon solvent with 0.005 to 10 millimoles per liter of solvent of a catalyst which is the reaction product from the steps of (1) reducing a first increment of tetrabutyltitanate with a mixed magnesium-aluminum alkyl of formula R 2 Mg.2AlR' 3 where R and R' may be the same or different alkyl groups having 1 to 20 carbon atoms; (2) adding hydrogen chloride in an amount of about 2 moles of chloride per mole of mixed magnesium-aluminum alkyl to deactivate any excess magnesium alkyl; and (3) adding a second increment of tetrabutyltitanate; said first and second increments of tetrabutyltitanate being selected such that the mole ratio of first to second increments is between 6:1 and 0.33:1; and said mixed magnesium alkyl being added in step (1) in an amount such that the mole ratio of magnesium alkyl to total titanate is between 50:1 and 350:1.
Claim 6
Independent Claim
176 words
A method for the polymerization of ethylene comprising subjecting ethylene to a temperature of from 0 ° to 150° C. at pressures of from 1 to 50 atmospheres in an inert hydrocarbon solvent with 0.005 to 10 millimoles per liter of solvent of a catalyst which is the reaction product from the steps of (1) reducing a first increment of tetrabutyltitanate with a mixed magnesium-aluminum alkyl of formula R 2 Mg.2AlR' 3 where R and R' may be the same or different alkyl groups having 1 to 20 carbon atoms; (2) adding hydrogen chloride in an amount of about 2 moles of chloride per mole of mixed magnesium-aluminum alkyl to deactivate any excess magnesium alkyl; and (3) adding a second increment of tetrabutyltitanate; said first and second increments of tetrabutyltitanate being selected such that the mole ratio of first to second increments is between 6:1 and 0.33:1; and said mixed magnesium alkyl being added in step (1) in an amount such that the mole ratio of magnesium alkyl to total titanate is between 50:1 and 350:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |