专利检索 ap:("MITSUI CHEMICALS, INC.") AND inv:"Kazutaka Tsuru" 第 1 页

1.

发明授权
Propylene-based block copolymer, production method therefor, and solid titanium catalyst ingredient for olefin polymerization 有权

公开(公告)号：US11535735B2

公开(公告)日：2022-12-27

申请号：US16978513

申请日：2019-03-07

申请人： MITSUI CHEMICALS, INC.

发明人： Atsushi Sakuma , Kazutaka Tsuru , Kenichiro Okamura

IPC分类号： C08L23/14 , C08F4/654 , C08F210/06 , C08F297/08

摘要： The purpose of the present invention is to provide a propylene-based block copolymer, the deposition thereof on the inner wall of the polymerization vessel having been sufficiently inhibited. The propylene-based block copolymer of the present invention has a flowability evaluation value of 40% or less, the value being calculated with the following equation wherein X (sec) is the number of seconds over which 100 g of the copolymer having ordinary temperature falls from a stainless-steel funnel having an inner diameter of 11.9 mm and Y (sec) is the number of seconds over which 100 g of the copolymer which has been held at 80° C. for 24 hours under a load of 10 kg falls from the funnel having an inner diameter of 11.9 mm. Flowability evaluation value (%)={(Y/X)−1}×100.