Patent ID: 7858716
Filing Date: 2010-12-28
Classification: C08F,C08L

Abstract:
1. A method for producing a propylene-based polymer by a gas-phase process where reaction heat is removed mainly by heat of vaporization of liquefied propylene, comprising: (I) gas-phase polymerizing propylene by contacting propylene with a solid catalyst component (A); wherein the solid catalyst component (A) is prepared by contacting the following components (A1), (A2) and (A3): wherein the gas-phase polymerizing includes a first stage where propylene is homo-polymerized or co-polymerized with one or more kinds of comonomers selected from the group consisting of ethylene and a C a second stage where propylene is co-polymerized with one or more kinds of comonomers selected from the group consisting of ethylene and a C (II) during at least one of the first stage and the second stage, adding, as a killing agen: a component (F): an electron donating compound.