Supported olefin polymerization catalysts
AssigneeEquistar Chemicals, LP
InventorsKaren E. Meyer, Mark K. Reinking
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Abstract
Supported heterometallocene catalysts wherein the support is a particulate polymeric material are provided. The catalysts have a transition metal complex containing at least one anionic, polymerization stable heteroatomic ligand associated with the transition metal and a boron activator compound deposited on the support. Polymeric supports used for the heterometallocene catalysts of the invention are homopolymers of ethylene and copolymers of ethylene and C3-8 α-olefins.
Claims5
A process which comprises polymerizing an olefin in the presence of a supported catalyst, said catalyst comprising:
- (a) a particulate ethylene homopolymer or ethylene-C3-8 α-olefin copolymer support;
- (b) a transition metal coordination complex containing at least one six-membered boraaryl ligand;
- and
- (c) a boron activator compound.
A process which comprises polymerizing an olefin in the presence of a supported catalyst, said catalyst comprising:
- (a) a particulate ethylene homopolymer or ethylene-C3-8 α-olefin copolymer support having a median particle size of 0.5 to 1000 microns and a melt index, measured according to ASTM D-1238, Condition E, using a 2.16 kg weight, of from 0.1 to 400 g/10 min;
- (b) a transition metal coordination complex having the formula (L*)n(L)mM(X)y in which M is a Group 3-10 metal, L* is six-membered boraaryl, L is a carbocyclic or constrain-inducing ligand or L*, X is hydrogen, halogen, hydrocarbyl, alkoxy, siloxy, or dialkylamido, n is 1 or 2, m is 0 to 3, y is 1 to 4, and n+m+y is equal to the valence of M;
- and
- (c) a boron activator compound selected from the group consisting of tri(pentafluorophenyl)borane, N,N-dimethylanilinium tetrakis(pentafluorophenyl)borate, and trityl tetrakis(pentafluorophenyl)borate;
- wherein the supported catalyst contains from 0.001 to 0.5 mmoles of transition metal per gram of support;
- and
- wherein the molar ratio of boron to transition metal is 0.1:1 to 10:1.
Dependencies are inferred from the claim text.