Mitsubishi Chemical Corporation

Glen H Ko

Fuminao Watanabe

Kenji Mitsutani

Kiyoshi Yukawa

Fumihiko Shimizu

Eiji Tanaka

A concentration distribution of a rubber component in block copolymer particles is computed based on the operating conditions of a polymerization apparatus, a growth model equation of polymer particles on a solid catalyst component, and a residence time distribution of the particles in each of a homopolymerization stage and a copolymerization stage, and the gel content of the block copolymer is estimated based on the computation. The gel content of a propylene block copolymer can thereby be estimated precisely.

Method of estimating gel content of propylene block copolymer

The present invention provides a propylene block copolymer comprising polymer particles whose rubber-like component contents are 50% by weight or more, in an amount less than 1.0% by weight of the whole polymer particles finally discharged from a polymerization system.

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Cambridge, MA, United States of America

Glen H Ko