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EP0284708B1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Metallocene catalyst systems for olefin polymerization having a silicon hydrocarbyl bridge.

Assignee: Fina Technology Inc
•
Filing: 1987-09-21
•
Granted: 1996-01-31
•
Expires: 2007-09-21
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Abstract

Abstract The present invention provides a method for varying the melting points and molecular weights of polyolefins by changing the structure of the catalyst used in the polymerization. The catalysts that are useful in the present invention are chiral, stereorigid metallocene catalyst of the formula R''(C5R'm)2MeQ. The catalysts include a bridge structure between the (C5R'm) groups and may contain substituents on the groups. It has been discovered that the melting points and molecular weights of the polymers produced by such catalysts are influenced by the bridge and substituents added to the (C5R'm) groups. Thus, the present invention provides a method for varying the melting points of the polymer product and a method of varying the molecular weights of the product by changing the components and structure of the metallocene catalysts. The present invention also provides a process for polymerizing olefins in which the melting points and/or molecular weights of the product may be controlled. Also included in the invention is the discovery that the melting points of the products are controlled by the number of inversions in the xylene insoluble fraction of the polymer.

Inventors

  • 👤 John A. Ewen

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 08:29
CPC Classifications
C; C08; C08F; C08F10/00; C07; C07F; C07F17/00; C08F110/00; C08F110/04; C08F110/06; C08F4/00; C08F4/42; C08F4/44; C08F4/60; C08F4/62; C08F4/64; C08F110/02; C08F4/639; C08F4/63912; C08F4/6392; C08F4/63922; C08F4/63927; C08F4/659; C08F4/65912; Y; Y10; Y10S; Y10S526/00; Y10S526/943

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 138 words
A catalyst system for polymerization of olefins comprising (a) a chiral, stereorigid metallocene catalyst described by the formula : R"(C₅R' m )₂ Me Qp wherein (C₅R' m ) is a cyclopentadienyl or substituted cyclopentadienyl; R' is hydrogen or hydrocarbyl radical having from 1-20 carbon atoms, each R' may be the same or different; R" is a silicon hydrocarbyl compound and acts as an interannular bridge between the two (C₅R' m ) rings wherein R" is an alkyl silyl or cycloalkyl silyl radical; Q is a hydrocarbon radical such as an aryl, alkyl alkenyl, alkylaryl or arylalkyl radical having 1-20 carbon atoms or is a halogen; Me is a group 4b, 5b, or 6b metal as designated in the Periodic Table of Elements; 0 ≤ m ≤ 4; and 0 ≤ p ≤ 3; and (b) an organoaluminum compound.
Claim 2
Dependent Claim 41 words
A catalyst system as in Claim 1 wherein the organoaluminum compound is alumoxane represented by the formula : R-Al-O or R(R-Al-O) n AlR₂ wherein R is an alkyl group with 1-5 carbons and n is an integer from 1 to 20.
Claim 3
Dependent Claim 14 words
A catalyst system as in Claim 1 wherein Me is titanium, zirconium or hafnium.
Claim 4
Dependent Claim 11 words
A catalyst system as in Claim 3 wherein Me is zirconium.
Claim 5
Dependent Claim 12 words
A catalyst system as in Claim 1 wherein R" is cyclopropyl silicon.
Claim 6
Dependent Claim 12 words
A catalyst system as in Claim 1 wherein C₅R' m is indenyl.
Claim 7
Dependent Claim 16 words
A catalyst system as in Claim 1 wherein Q is a halogen and p is 2.
Claim 8
Dependent Claim 11 words
A catalyst system as in Claim 7 wherein Q is chlorine.
Claim 9
Dependent Claim 14 words
A catalyst system as in Claim 1 wherein the metallocene catalyst is dimethylsilylbis-(indenyl)zirconium dichloride.
Claim 10
Dependent Claim 14 words
A catalyst system as in Claim 1 wherein the metallocene catalyst is cyclopropylsilylbis-(indenyl)zirconium dichloride.
Claim 11
Dependent Claim 12 words
A catalyst system as in Claim 1 wherein the olefin is propylene.

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