Catalyst composition comprising shuttling agent for ethylene multi-block copolymer formation

摘要

A composition for use in forming a multi-block copolymer, said copolymer containing therein two or more segments or blocks differing in chemical or physical properties, a polymerization process using the same, and the resulting polymers, wherein the composition comprises 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 chemical or physical properties from the polymer prepared by catalyst (A) under equivalent polymerization conditions, and(C) a chain shuttling agent.

主权项

1. An ethylene/α-olefin multi-block interpolymer comprising in polymerized form at least 50 mole percent ethylene and one or more copolymerizable α-olefin comonomers, said interpolymer containing therein two or more blocks differing in comonomer content, crystallinity, density, melting point or glass transition temperature;
the interpolymer comprising from 3.7 ppm to 11.0 ppm of a first Group IVB metal and a second Group IVB metal.