US4255544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerization of ethylene
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1980-03-28
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Granted: 1981-03-10
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Expires: 2000-03-28
Abstract
Abstract Ethylene is polymerized in the presence of a catalyst comprising: (A) the reaction product of a magnesium compound and titanium halide and (B) an organic aluminum compound wherein Component A is prepared by reacting magnesium dialkoxide with a halogen-containing silicon compound and an alcohol to provide a solid material and then reacting the solid material with titanium halide in the presence of an alkoxy-containing silicon compound.
Inventors
- 👤 Akio Kimura
- 👤 Satoshi Asahi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:02
CPC Classifications
C; C08; C08F; C08F10/00; C08F10/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
In a process for polymerizing ethylene in the presence of a catalyst comprising (A) a reaction product of magnesium compound and titanium halide and (B) an organic aluminum compound, the improvement characterized in that there is employed as Component A a solid material, which is produced by the process comprising reacting magnesium dialkoxide with a halogen-containing silicon compound of the formula X n 1 Si(OR 1 ) 4-n wherein X 1 is a halogen atom, R 1 is an alkyl group, and O<n≦4, and an alcohol to form a modified magnesium dialkoxide, said alcohol being in an amount of from 0.1 to 10 moles per mole of said magnesium dialkoxide, said halogen-containing silicon compound being in an amount to provide a halogen/magnesium atomic ratio of 1 or less, and reacting said modified magnesium dialkoxide with a titanium halide in the presence of an alkoxy-containing silicon compound of the formula: X 4-m 2 Si(OR 2 ) m wherein X 2 is a halogen atom, R 2 is an alkyl group, and O<m≦4, to form said solid material.
Claim 2
Dependent Claim
176 words
In a process for polymerizing ethylene in the presence of a catalyst comprising (A) a reaction product of magnesium compound and titanium halide and (B) an organic aluminum compound, the improvement characterized in that there is employed as Component A a solid material, which is produced by the process comprising reacting magnesium dialkoxide with a halogen-containing silicon compound of the formula X n 1 Si(OR 1 ) 4-n wherein X 1 is a halogen atom, R 1 is an alkyl group, and O<n≦4, and an alcohol to form a modified magnesium dialkoxide, said alcohol being in an amount of from 0.1 to 10 moles per mole of said magnesium dialkoxide, said halogen-containing silicon compound being in an amount to provide a halogen/magnesium atomic ratio of 1 or less, and reacting said modified magnesium dialkoxide with a titanium halide in the presence of an alkoxy-containing silicon compound of the formula: X 4-m 2 Si(OR 2 ) m wherein X 2 is a halogen atom, R 2 is an alkyl group, and O<m≦4, to form said solid material.
Claim 3
Dependent Claim
57 words
The process of claim 1 wherein said magnesium dialkoxide contains between 1 and 20 carbon atoms in each alkoxide group, wherein said alcohol is a straight-chain or branched-chain aliphatic alcohol or an alicyclic alcohol containing up to 8 carbon atoms; and wherein R 1 and R 2 are alkyl groups containing from 1 to 8 carbon atoms.
Claim 4
Dependent Claim
24 words
The process of claim 2 wherein said alcohol is in an amount of between 0.1 and 4 moles per mole of said magnesium dialkoxide.
Claim 5
Dependent Claim
28 words
The process of claim 2 or claim 3 wherein said halogen-containing silicon compound is in an amount to provide said halogen/magnesium atomic ratio of between 1/5 and 1.
Claim 6
Dependent Claim
25 words
The process of claim 1 wherein said halogen-containing silicon compound is in an amount to provide said halogen/magnesium atomic ratio of between 1/5 and 1.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein said titanium halide is in an amount of from 1 to 20 moles per mole of the magnesium dialkoxide.
Claim 8
Dependent Claim
25 words
The process of claim 1 wherein said titanium halide is in an amount of from 1.5 to 10 moles per mole of the magnesium dialkoxide.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |