Claims
- 1. A process for the in situ polymerization of ethylene consisting essentially of polymerizing ethylene with one or more C.sub.3 -C.sub.10 .alpha.-olefins in the presence of a catalyst consisting essentially of vanadium (III) acetylacetonate, a co-catalyst consisting essentially of an alkylaluminum halide compound and optionally a halogenated promoter, wherein said catalyst is insoluble in the reaction environment, and wherein said catalyst is a suspension obtained by mixing, in an atmosphere of ethylene or said one or more .alpha.-olefins:
- a) vanadium (III) acetylacetonate; and
- b) a hydrocarbon solution of an alkylaluminum halide compound.
- 2. The process of claim 1, wherein mixing of said vanadium (III) acetylacetonate and said hydrocarbon solution of an alkylaluminum halide compound is effected in an atmosphere of ethylene.
- 3. The process of claim 1, wherein said vanadium (III) acetylacetonate is in a hydrocarbon solution or suspension.
- 4. The process of claim 1, wherein said alkylaluminum halide compound has the formula R.sub.n AlX.sub.m, wherein R is C.sub.1 -C.sub.20 alkyl, X is halogen, (m+n)=3, and n is an integer from 0 to 2.
- 5. The process of claim 4, wherein said halogen is chlorine.
- 6. The process of claim 5, wherein said alkylaluminum chloride compound is selected from the group consisting of Al(C.sub.2 H.sub.5).sub.2 Cl and Al(C.sub.2 H.sub.5)Cl.sub.2.
- 7. The process of claim 6, wherein said alkylaluminum chloride compound is Al(C.sub.2 H.sub.5).sub.2 Cl.
- 8. The process of claim 1, wherein said vanadium (III) acetylacetonate and said alkylaluminum halide compound are used in a molar ratio of between 1 and 20.
- 9. The process of claim 8, wherein said molar ratio is between about 3 to 5.
- 10. The process of claim 1, wherein a precipitate which is formed by mixing (a) and (b) contains a weight ratio of prepolymer and vanadium (III) acetylacetonate of between 2 and 150.
- 11. The process of claim 10, wherein the precipitate has a weight ratio of prepolymer and vanadium (III) acetylacetonate of between 6 and 35.
- 12. The process of claim 1, wherein polymerization is effected in a reaction medium in which the polymer is insoluble, at a temperature of between -5.degree. C. and 65.degree. C., with a contact time of between 10 minutes and 6 hours, in the presence of hydrogen, at a total pressure of between 5 and 100 bar, with a ratio between partial ethylene pressure and partial hydrogen pressure of more than 4.
- 13. The process of claim 12, wherein a suspension is used, and the reaction medium consists of one of the monomers optionally diluted with saturated hydrocarbon, at a temperature of between 25.degree. C. and 50.degree. C., with a contact time of between 15 minutes and 1 hour, in the presence of hydrogen, at a total pressure of between 8 and 30 bar, with a ratio of between partial ethylene pressure and partial hydrogen pressure of more than 20.
- 14. The process of claim 1, wherein said .alpha.-olefin is propylene.
- 15. The process of claim 1, wherein a halogenated promoter is employed and is selected from the group consisting of ethyl trichloroacetate, n-butyl perchlorocrotonate, diethyl dichloromalonate, carbon tetrachloride and chloroform.
Priority Claims (1)
Number |
Date |
Country |
Kind |
MI95A1403 |
Jun 1995 |
ITX |
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Parent Case Info
This application is a Continuation of application Ser. No. 08/644,064 filed May 9, 1996, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (5)
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EPX |
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1 295 681 |
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Non-Patent Literature Citations (1)
Entry |
Tony Whelan, "Polymer Technology Dictionary", p. 1, 1994. |
Continuations (1)
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Number |
Date |
Country |
Parent |
644064 |
May 1996 |
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