Claims
- 1. A process for the polymerization of an olefin to provide a polyolefin of high melt index which comprises contacting the olefin with a catalyst system obtained by heat activating a supported organophosphoryl chromium compound obtained by the reaction of chromium trioxide with an organphosphorous compound having the formula: ##STR8## wherein R is alkyl, aralkyl, aryl, cycloalkyl, or hydrogen, but at least one R is other than hydrogen, and combining the heat activated supported material with a melt index increasing amount of at least one organoborane catalyst modifier having the formula: ##STR9## wherein m and n each is zero or 1, with the proviso that m and n are not both zero,
- R.sub.1 and R.sub.2 are each a hydrocarbyl group of from 1 to 10 carbon atoms, or one of R.sub.1 and R.sub.2 is hydrogen, or together R.sub.1 and R.sub.2 constitute a hydrocarbyl group of from 2 to 10 carbon atoms.
- 2. The process of claim 1 wherein said organoborane is combined with an alkyl borane compound.
- 3. The process of claim 2 wherein the alkyl borane compound is triethyl borane.
- 4. The process of claim 3 wherein the organoborane is combined with an alkyl aluminum compound.
- 5. The process of claim 4 wherein the alkyl aluminum compound is triethyl aluminum or triisobutyl aluminum.
- 6. The process of claim 1 wherein the organoborane is selected from the group consisting of catechol borane, dimethoxy borane and ethoxy borane.
Parent Case Info
This is a division of application Ser. No. 243,677, filed Mar. 13, 1981, now U.S. Pat. No. 4,379,075.
US Referenced Citations (5)
Foreign Referenced Citations (1)
Number |
Date |
Country |
7905445 |
Feb 1980 |
NLX |
Non-Patent Literature Citations (1)
Entry |
U.S. Equivalent of Netherlands Reference. |
Divisions (1)
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Number |
Date |
Country |
Parent |
243677 |
Mar 1981 |
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