Olefin polymerization method
OwnerAlbert P. Masinoinventor
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Abstract
A method of polymerizing one or more 1-olefins using a catalyst system incorporating a solid catalyst component is disclosed wherein the catalyst component is prepared by contacting, in the presence of an inert liquid hydrocarbon, silica, a soluble organomagnesium compound, an SiCl.sub.4 magnesium fixing agent, an alcohol, TiCl.sub.4, and a carboxylic acid derivative, followed by extraction with a TiCl.sub.4 containing extraction liquid. The inventive catalyst system allows ready control of product molecular weight by control of hydrogen concentration in the reactor, and allows the production of high MI or MF polymers at high productivities.
Claims24
A method of polymerizing one or more polymerizable 1-olefins, said method comprising the step of polymerizing said 1-olefin or 1-olefins under polymerizing conditions in the presence of a catalyst system comprising an alkylaluminum cocatalyst and a solid catalyst component prepared by a method comprising the steps of:
- (a) contacting particulate, porous silica of the formula SiO.sub.2 .multidot.aAl.sub.2 O.sub.3 where a is in the range of 0 to about 2 with a hydrocarbon-soluble organomagnesium compound selected from the group consisting of hydrocarbon-soluble dialkyl magnesium compounds, alkoxymagnesium halides, dialkoxymagnesium compounds, and alkylalkoxymagnesium compounds in the presence of an inert liquid hydrocarbon to produce a solid product;
- (b) contacting the solid product of step (a) with a magnesium fixing agent comprising SiCl.sub.4 at a temperature less than about 70.degree. C.;
- (c) contacting the solid product of step (b) with a C.sub.1 -C.sub.8 alkanol in a molar ratio of alkanol to magnesium in the range of about 1 to about 5, inclusive;
- (d) contacting the solid product of step (c) with TiCl.sub.4 ;
- and,
- (e) contacting the solid product of step (d) with a carboxylic acid derivative selected from the group consisting of alkyl, aryl, and cycloalkyl carboxylic acid dichlorides, anhydrides and diesters;
- or,
- (d') contacting the solid product of step (c) with a carboxylic acid derivative selected from the group consisting of alkyl, aryl, and cycloalkyl carboxylic acid dichlorides, anhydrides and diesters;
- and,
- (e') contacting the solid product of step (d') with TiCl.sub.4 ;
- or,
- (d'') contacting the solid product of step (c) with TiCl.sub.4 and a carboxylic acid derivative selected from the group consisting of alkyl, aryl, and cycloalkyl carboxylic acid dichlorides, anhydrides and diesters;
- (f) subsequently subjecting the solid product of step (e), step (e') or step (d'') to extraction with an extraction liquid comprising TiCl.sub.4 at a temperature of greater than about 100.degree. C. for about 1 to 3 hours to produce a solid product;
- and,
- (g) isolating said solid product of step (f).
A method of polymerizing one or more polymerizable 1-olefins, said method comprising the step of polymerizing said 1-olefin or 1-olefins under polymerizing conditions in the presence of a catalyst system comprising a suitable cocatalyst and a solid catalyst component prepared by a method including the steps of contacting silica with a hydrocarbon soluble organomagnesium compound to produce a first solid product;
- contacting the first solid product with an alcohol to produce a second solid product;
- and contacting the second solid product with a carboxylic acid derivative and with TiCl.sub.4 to produce the solid catalyst component, wherein the first solid product is contacted with SiCl.sub.4 to fix a magnesium component in the first solid product prior to contact with TiCl.sub.4.
Dependencies are inferred from the claim text.