US4229558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyolefin
Assignee: Mitsubishi Chemical Corp
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Filing: 1979-08-30
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Granted: 1980-10-21
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Expires: 1999-08-30
Abstract
Abstract In a process for preparing polyolefin by polymerizing an olefin in the presence of a catalyst system combining an organoaluminum compound and a titanium-containing solid catalytic component prepared by mixing (a) water and/or a hydroxy compound, (b) a Grignard reagent and (c) a titanium tetrahalide, the components (a) (b) or (c) or the reaction mixture of two or three components thereof is contacted with (d) one or more electron donor selected from the group consisting of amines, carboxylic acid amides, phosphines, phosphine oxides, phosphoric esters, phosphorous esters, phosphoric acid amides, ketones and carboxylic esters. The polyolefin having high isotactic index can be obtained.
Inventors
- 👤 Genjiro Kakogawa
- 👤 Masayoshi Hasuo
- 👤 Yoshinori Suga
- 👤 Hisashi Kitada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A process for preparing polyolefins by polymerizing an α-olefin or a mixture of α-olefin in the presence of a catalyst system prepared by combining: (i) an aluminum-free, titanium-containing, solid catalytic component prepared by contacting an ether suspension of amorphous magnesium hydroxyhalide prepared by reacting (a) water with (b) a Grignard reagent having the formula R'MgX wherein R' is a hydrocarbon moiety and X is a halogen atom at a temperature of from 20° to 200° C. and (d) a carboxylic ester with (c) titanium tetrachloride at a temperature of from 60° to 200° C.; with (ii) an organoaluminum compound.
Claim 2
Dependent Claim
99 words
A process for preparing polyolefins by polymerizing an α-olefin or a mixture of α-olefin in the presence of a catalyst system prepared by combining: (i) an aluminum-free, titanium-containing, solid catalytic component prepared by contacting an ether suspension of amorphous magnesium hydroxyhalide prepared by reacting (a) water with (b) a Grignard reagent having the formula R'MgX wherein R' is a hydrocarbon moiety and X is a halogen atom at a temperature of from 20° to 200° C. and (d) a carboxylic ester with (c) titanium tetrachloride at a temperature of from 60° to 200° C.; with (ii) an organoaluminum compound.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein the α-olefin is propylene.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein the α-olefin is a mixture of propylene and another α-olefin.
Claim 5
Dependent Claim
39 words
The process of claim 1 wherein the product of (a) and (b) is a compound having the formula Mg(OR.sup.8)X.nE wherein R 8 represents hydrogen; X represents a halogen atom; E represents an ether and n represents 0.4 to 25.
Claim 6
Dependent Claim
38 words
The process of claim 1 wherein the titanium-containing solid catalytic component is prepared by adding the component (c) to a product obtained by contacting the component (a) with the component (b) in the presence of the component (d).
Claim 7
Dependent Claim
40 words
The process of claim 1 wherein the product of (a) and (b) is a compound having the formula Mg(OR.sup.8)X.nE wherein R 8 represents hydrogen atom; X represents a halogen atom; E represents an ether; and n represents 0.4 to 25.
Claim 8
Dependent Claim
40 words
The process of claim 1 wherein the titanium-containing solid catalytic component is prepared by adding the component (d) to a product obtained by contacting the component (a) with the component (d) and then, adding the component (c) to the mixture.
References Cited (Backward Citations)
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US4071672A
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JPS49119982A
Cited
US4076924A
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US4069169A
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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) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |