Patent US4440869A successfully refreshed from Google Patents.
US4440869A
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Olefin polymerization catalyst
Assignee: EIDP Inc
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Filing: 1982-09-30
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Granted: 1984-04-03
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Expires: 2002-09-30
Abstract
Abstract High activity catalysts for the polymerization of ethylene and other alpha -olefins are made by contacting a soluble magnesium compound of the general formula Mg(OSiR3)2, wherein each R is, independently, alkyl, alkoxy or aryl, with a titanium tetralkoxide (titanate) in a saturated aliphatic hydrocarbon solution, followed by chlorination and precipitation by a suitable chlorinating agent. These catalysts show high activity for the polymerization of ethylene under slurry polymerization conditions.
Inventors
- 👤 Mark L. Shannon
- 👤 Mark P. Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:10
CPC Classifications
C; C08; C08F; C08F10/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
153 words
A method for preparing catalysts for polymerization of alpha-olefins comprising contacting, in substantial absence of proton donor, a soluble magnesium compound of the general formula Mg(OSiR 3 ) 2 with transition metal tetraalkoxide of the general formula M(OR 1 ) 4 in a saturated aliphatic hydrocarbon solvent to form a solution, then forming a precipitate by chlorinating the solution in the substantial absence of free oxygen and recovering the precipitate for use as a catalyst, wherein each R is, independently, alkyl groups or alkoxy groups containing from 1 to about 20 carbon atoms or aryl, aryloxy groups, cycloalkoxy groups or cycloalkyl groups containing from 6 to 14 carbon atoms and each R 1 is independently, alkyl groups or etherically substituted alkyl groups containing from 1 to 20 carbon atoms, aryl, cycloalkyl or etherically substituted aryl or cycloalkyl groups containing from 6 to 14 carbon atoms and M is titanium, vanadium, chromium or zirconium.
Claim 2
Independent Claim
153 words
A method for preparing catalysts for polymerization of alpha-olefins comprising contacting, in substantial absence of proton donor, a soluble magnesium compound of the general formula Mg(OSiR 3 ) 2 with transition metal tetraalkoxide of the general formula M(OR 1 ) 4 in a saturated aliphatic hydrocarbon solvent to form a solution, then forming a precipitate by chlorinating the solution in the substantial absence of free oxygen and recovering the precipitate for use as a catalyst, wherein each R is, independently, alkyl groups or alkoxy groups containing from 1 to about 20 carbon atoms or aryl, aryloxy groups, cycloalkoxy groups or cycloalkyl groups containing from 6 to 14 carbon atoms and each R 1 is independently, alkyl groups or etherically substituted alkyl groups containing from 1 to 20 carbon atoms, aryl, cycloalkyl or etherically substituted aryl or cycloalkyl groups containing from 6 to 14 carbon atoms and M is titanium, vanadium, chromium or zirconium.
Claim 3
Dependent Claim
11 words
A method as described in claim 1 wherein M is titanium.
Claim 4
Dependent Claim
24 words
A method as described in claim 2 wherein the solution is chlorinated with a compound containing chlorine bonded to hydrogen, metal, or organic groups.
Claim 5
Dependent Claim
68 words
A method as described in claim 3 wherein the chlorinating agent is selected from the group consisting of hydrogen chloride, ethylaluminum dichloride, silicon tetrachloride, carbon tetrachloride, boron trichloride, phosphorus trichloride, diethylaluminum chloride, ethylaluminum sesquichloride, SnCl 4 , HSiCl 3 , aluminum chloride, ethylboron dichloride, boron chloride, diethylboron chloride, chloroform, phosphorus oxytrichloride acetyl chlorides, thionyl chloride, sulfur chloride, methyl trichlorosilane, dimethyl dichlorosilane, titanium tetrachloride, vanadium tetrachloride and vanadium pentachloride.
Claim 6
Dependent Claim
61 words
A method as described in claim 4 wherein the soluble magnesium compound is a magnesium bissiloxide selected from the group consisting of bis(butyl dimethyl siloxy) magnesium, bis(butyl methyl phenyl siloxy) magnesium, bis(butyl (2-ethyl-1-hexoxy) methyl siloxy) magnesium, bis((n-hexyl) (2-ethyl-1-hexoxy) methyl siloxy) magnesium, bis(di-n-hexyl methyl siloxy) magnesium, bis(methyl butyl (n-octadecanoxy) siloxy magnesium, bis(methyl butyl (2-(2-n-dodecanoxyethoxy) ethoxy) siloxy) magnesium, and bis(n-hexyl dimethyl siloxy) magnesium.
Claim 7
Dependent Claim
38 words
A method as described in claim 5 wherein the titanium tetraalkoxide compound is selected from the group consisting of isopropyl titanate, n-butyl titanate, phenyl titanate, di(isopropyl) bis(2-ethoxyethyl) titanate, tetramethyl titanate, tetracyclohexyl titanate, tetra-n-octadecyl titanate and di-isopropyl (2-(2-n-dodecanoxyethoxy)ethyl) titanate.
Claim 8
Dependent Claim
23 words
A method as described in claim 6 wherein the mole ratio of chlorine to magnesium is from about 1:1 to about 25:1, respectively.
Claim 9
Dependent Claim
24 words
A method as described in claim 7 wherein the mole ratio of magnesium to titanium is from about 0.5 to 1 to 75:1, respectively.
Claim 10
Dependent Claim
36 words
A method as described in claim 8 wherein the saturated aliphatic hydrocarbon is selected from the group consisting of n-pentane, n-octane, n-hexane, cycloheptane, cyclohexane, methyl cyclohexane, iso-octane, neo-pentane, petroleum ether and isomers, mixtures and cogenors thereof.
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) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |