Cyclobutyl silanes for catalysts useful for making highly isotactic olefin polymers

a technology of cyclobutyl silane and catalyst, which is applied in the direction of catalyst activation/preparation, physical/chemical process catalyst, chemical/physical process, etc., can solve the problems of large losses in catalyst activity and difficult to accommodate compromises in catalyst activity, and achieve high catalytic efficiency of catalysts. , the effect of large toleran

Inactive Publication Date: 2003-03-04
ENGELHARD CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides alpha-olefin polymerization catalyst systems, methods of making the alpha-oleafin polymerization catalyst systems, and methods of polymerizing (and copolymerizing) alpha-olefins involving the use of cyclobutyl moiety containing external electron donors. The cyclobutyl moiety containing external electron donors of the alpha-olefin polymerization catalyst systems contribute to the production of low xylene soluble poly-alpha-olefins while simulta...

Problems solved by technology

However, using an electron donor to promote increased stereospecificity of poly-alpha-olefins in a Ziegler-Natta polymerization scheme tends to cause large losses in catalyst acti...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

1. Preparation of a Solid Titanium Catalyst Component (A)

Anhydrous magnesium chloride (0.05 mol), toluene (75 ml), epoxy chloropropane (0.1 mol) and tributyl phosphate (0.03 mol) are introduced into a reactor which has thoroughly been purged with highly purified nitrogen. The temperature is raised to 50.degree. C. with stirring, and the mixture is then maintained at this temperature for 2 hours, while the solids dissolve completely. Phthalic anhydride (0.008 mol) is added to the solution, and then the solution is maintained for an additional 1 hour at 50.degree. C. The solution is cooled to -25.degree. C. Titanium tetrachloride (55 ml) is added dropwise over the course of 1 hour. The solution is heated to 80.degree. C. over the course of 3 hours, while a solid product precipitates. Diisobutyl Phthalate (0.0125 mol) is added and the mixture is maintained at the temperature of 80.degree. C. for 1 hour.

The solid portion is collected by filtration and washed with toluene (2.times.100 ml...

example 2

1. Preparation of a Solid Titanium Catalyst Component (A)

Anhydrous magnesium chloride (0.05 mol), toluene (75 ml), epoxy chloropropane (0.1 mol) and tributyl phosphate (0.03 mol) are introduced into a reactor which has thoroughly been purged with highly purified nitrogen. The temperature is raised to 50.degree. C. with stirring, and the mixture is then maintained at this temperature for 2 hours, while the solids dissolve completely. Phthalic anhydride (0.008 mol) is added to the solution, and then the solution is maintained for an additional 1 hour at 50.degree. C. The solution is cooled to -25.degree. C. Titanium tetrachloride (55 ml) is added dropwise over the course of 1 hour. The solution is heated to 80.degree. C. over the course of 3 hours, while a solid product precipitates. Diisobutyl Phthalate (0.0125 mol) is added and the mixture is maintained at the temperature of 80.degree. C. for 1 hour.

The solid portion is collected by filtration and washed with toluene (2.times.100 ml...

example 3

1. Preparation of a Solid Titanium Catalyst Component (A)

Anhydrous magnesium chloride (0.05 mol), toluene (75 ml), epoxy chloropropane (0.1 mol) and tributyl phosphate (0.03 mol) are introduced into a reactor which has thoroughly been purged with highly purified nitrogen. The temperature is raised to 50.degree. C. with stirring, and the mixture is then maintained at this temperature for 2 hours, while the solids dissolve completely. Phthalic anhydride (0.008 mol) is added to the solution, and then the solution is maintained for an additional 1 hour at 50.degree. C. The solution is cooled to -25.degree. C. Titanium tetrachloride (55 ml) is added dropwise over the course of 1 hour. The solution is heated to 80.degree. C. over the course of 3 hours, while a solid product precipitates. Diisobutyl Phthalate (0.0125 mol) is added and the mixture is maintained at the temperature of 80.degree. C. for 1 hour.

The solid portion is collected by filtration and washed with toluene (2.times.100 ml...

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Abstract

One aspect of the present invention relates to a catalyst system for use in olefinic polymerization, containing a solid titanium catalyst component prepared by contacting a titanium compound and a magnesium compound; an organoaluminum compound having at least one aluminum-carbon bond; and an organosilicon compound comprising at least one of cyclobutyl group. Another aspect of the present invention relates to a method of making a catalyst for use in olefinic polymerization, involving the steps of reacting a Grignard reagent having a cyclobutyl group with an orthosilicate to provide an organosilicon compound having a cyclobutyl moiety; and combining the organosilicon compound with an organoaluminum compound having at least one aluminum-carbon bond and a solid titanium catalyst component prepared by contacting a titanium compound and a magnesium compound.

Description

FIELD OF THE INVENTIONThe present invention generally relates to olefin polymerization catalyst systems. In particular, the present invention relates to catalyst systems for making olefin polymers and copolymers and methods of making the catalyst systems and alpha-olefin polymers and copolymers that are highly isotactic.BACKGROUND OF THE INVENTIONPolyolefins are a class of polymers derived from simple olefins and include polypropylene and polybutene. Known methods of making polyolefins involve the use of Ziegler-Natta polymerization catalysts. These catalysts polymerize vinyl monomers using a transition metal halide to provide a stereoregulated polymer.Numerous Ziegler-Natta polymerization catalysts exist. The catalysts have different characteristics and / or lead to the production of polyolefins having diverse properties. For example, certain catalysts have high activity while other catalysts have low activity, and similarly certain catalysts have a long life while other catalysts ha...

Claims

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Application Information

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IPC IPC(8): B01J31/16C08F10/00B01J31/14B01J31/12C08F110/06C08F110/00B01J31/02
CPCB01J31/122B01J31/0212B01J31/14B01J31/143C08F10/00C08F110/06
Inventor SPENCER, MICHAEL D.CHENG, CHUNG-PING
Owner ENGELHARD CORP
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