Patent US3949897A successfully refreshed from Google Patents.
US4359402A
Expired / Lapsed
US
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Monoolefin catalysts and method for the preparation thereof
Assignee: Standard Oil Co
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Filing: 1980-06-16
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Granted: 1982-11-16
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Expires: 2000-06-16
Abstract
Abstract The invention herein is directed toward a method for forming a coating on the surface of a catalyst and includes the steps of dissolving a membrane forming compound in a hdyrocarbon solvent, adding the catalyst to the solvent and agitating to form a mixture and finally drying the mixture to form particles of the catalyst having a coating of the membrane forming compound. Particularly suitable for the polymerization of monoolefins are Ziegler-Natta catalyts which can be coated according to the foregoing method. The compounds forming the coating include the silicone greases obtained by mixing a filler material with a dimethylpolysiloxane fluid.
Inventors
- 👤 Frederick W. Haas
- 👤 William J. Miloscia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:00
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A method for forming a coating on the surface of Ziegler-Natta catalysts for the polymerization of monoolefins comprising the steps of: dissolving a membrane forming compound, selected from the group consisting of silicones, tetraalkyl silicons, silicon alkyl halides and silicon alkyl hydrides, in a hydrocarbon solvent; adding the Ziegler-Natta catalyst to said hydrocarbon solvent and agitating to form a mixture; and, drying said mixture to form particles of the catalyst having a coating of said membrane forming compound.
Claim 2
Independent Claim
78 words
A method for forming a coating on the surface of Ziegler-Natta catalysts for the polymerization of monoolefins comprising the steps of: dissolving a membrane forming compound, selected from the group consisting of silicones, tetraalkyl silicons, silicon alkyl halides and silicon alkyl hydrides, in a hydrocarbon solvent; adding the Ziegler-Natta catalyst to said hydrocarbon solvent and agitating to form a mixture; and, drying said mixture to form particles of the catalyst having a coating of said membrane forming compound.
Claim 3
Dependent Claim
37 words
A method as set forth in claim 1, wherein said silicone compound is a silicone grease comprising a dimethylpolysiloxane fluid, having the formula ##STR2## where n is a numeral from 0 to 9; and, a filler material.
Claim 4
Dependent Claim
22 words
A method as set forth in claim 2, wherein said hydrocarbon solvent is selected from the group consisting of hexane and heptane.
Claim 5
Independent Claim
27 words
A method as set forth in claims 1 or 2 comprising the additional step of: adding a catalyst support material with the catalyst to said hydrocarbon solvent.
Claim 6
Dependent Claim
53 words
A method as set forth in claim 4, comprising the additional step of: mixing a co-catalyst with said coated catalyst, said co-catalyst having the formula R n AlX 3-n ; wherein R is an alkyl having one to about four carbon atoms, X is chlorine or bromine and n is 1 to 3.
Claim 7
Dependent Claim
22 words
A method as set forth in claim 5, wherein said support material is a polyolefin particle and said co-catalyst is diethylaluminum chloride.
Claim 8
Dependent Claim
40 words
A Ziegler-Natta catalyst for the polymerization of monoolefins the improvement wherein the catalyst particles are provided with a coating comprising a membrane forming compound selected from the group consisting of silicones, tetraalkyl silicons, silicon alkyl halides and silicon alkyl hydrides.
Claim 9
Dependent Claim
40 words
A Ziegler-Natta catalyst for the polymerization of monoolefins the improvement wherein the catalyst particles are provided with a coating comprising a membrane forming compound selected from the group consisting of silicones, tetraalkyl silicons, silicon alkyl halides and silicon alkyl hydrides.
Claim 10
Dependent Claim
38 words
A Ziegler-Natta catalyst, as set forth in claim 7, wherein said silicone compound is a silicone grease comprising: a dimethylpolysiloxane fluid, having the formula ##STR3## where n is a numeral from 0 to 9; and, a filler material.
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) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |