Catalyst composition comprising shuttling agent for tactic/ atactic multi-block copolymer formation
AssigneeDow Global Technologies LLC
InventorPhillip D. Hustad
Life of this patent
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Abstract
Copolymers, especially multi-block copolymer containing therein two or more segments or blocks differing in tacticity, are prepared by polymerizing propylene, 4-methyl-1-pentene, or another C4-8 α-olefin in the presence of a composition comprising the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers differing in tacticity from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.
Claims13
1-2. (canceled)
A process for preparing a propylene containing multi-block copolymer comprising contacting propylene under addition polymerization conditions with a composition comprising:
- the admixture or reaction product resulting from combining:
- (A) a first olefin polymerization catalyst,
- (B) a second olefin polymerization catalyst capable of preparing a polymer differing in tacticity from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and
- (C) a chain shuttling agent.
A process for preparing a 4-methyl-1-pentene containing multi-block copolymer comprising contacting 4-methyl-1-pentene under addition polymerization conditions with a composition comprising:
- the admixture or reaction product resulting from combining:
- (A) a first olefin polymerization catalyst,
- (B) a second olefin polymerization catalyst capable of preparing a polymer differing in tacticity from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and
- (C) a chain shuttling agent.
10-21. (canceled)
Dependencies are inferred from the claim text.