Claims
- 1. A process for preparing an olefin polymerization catalyst system which comprises:
- (a) depositing an organophosphoryl chromium reaction product of chromium trioxide and a phosphorus compound having the formula ##STR2## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen but at least one R is other than hydrogen, upon a solid inorganic support material;
- (b) depositing aluminum acetylacetonate upon said support material; and,
- (c) heat-activating said supported organophosphoryl chromium reaction product and aluminum acetylacetonate in a non-reducing atmosphere at a temperature above about 300.degree. C. up to the decomposition temperature of the support material.
- 2. The process for preparing a catalyst system according to claim 1 wherein the aluminum acetylacetonate is first deposited upon the support material and the thus treated support is heat-activated in a non-reducing atmosphere at a temperature of at least about 130.degree. C. up to the decomposition temperature of the support and the organophosphoryl chromium reaction product is thereafter deposited upon the support and the thus treated support is again heat-activated but at a temperature above about 300.degree. C. up to the decomposition temperature of the support.
- 3. The process for preparing a catalyst system according to claim 1 or 2 wherein said support material contains silica gel.
- 4. The process for preparing a catalyst system according to claim 2 wherein said silica gel is a silica xerogel having a surface area in the range of about 200 to about 500 m.sup.2 /g and a pore volume greater than about 2.0 cc/g, a major portion of the pore volume being provided by pores having diameters in the range of from about 300 to about 600 angstrom units.
- 5. The process for preparing a catalyst system according to claim 1 or 2 wherein the organophosphoryl chromium reaction product is derived from the reaction of chromium trioxide and triethyl phosphate.
- 6. The process for preparing a catalyst system according to claim 1 or 2 wherein a metallic and/or non-metallic reducing agent is added to the heat-activated catalyst.
- 7. The process for preparing a catalyst system according to claim 6 wherein the reducing agent is a metallic reducing agent selected from the group consisting of triethyl aluminum, triisobutyl aluminum, alkyl aluminum halide, alkyl aluminum alkoxide, dialkyl zinc, dialkyl magnesium and metal borohydride.
- 8. The process for preparing a catalyst system according to claim 6 in which the reducing agent is a non-metallic reducing agent selected from the group consisting of alkyl borane and hydrides of boron.
- 9. The process of preparing a catalyst system according to claim 8 wherein the alkyl borane is triethyl borane.
- 10. The process of preparing a catalyst system according to claim 1 or 2 wherein the organophosphoryl chromium reaction product is present in an amount sufficient to provide about 0.25 to about 2.5% by weight of Cr based upon the weight of the support material and the aluminum acetylacetonate is present in an amount sufficient to provide about 0.10 to about 10% by weight of Al based upon the weight of the support material.
- 11. The olefin polymerization catalyst system produced by the process of claim 1 or 2.
- 12. The olefin polymerization catalyst of claim 11 to which a metallic and/or non-metallic reducing agent is added.
Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 724,484 filed Sept. 20, 1976 which in turn is a continuation-in-part of Ser. No. 558,504 filed Mar. 15, 1975, now U.S. Pat. No. 3,984,351.
US Referenced Citations (16)
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
724484 |
Sep 1976 |
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Parent |
558504 |
Mar 1975 |
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