China Petroleum & Chemical Corporation

Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation

Sinopec Beijing Research Institute of Chemical Industry

Guozhu Yu

Wei Li

Lin Xu

Chuanqing Li

Jie Zhang

Aimin Liang

Wei Sun

Yishuang Xin

Jinmei Tan

Chao Wang

Hui Liu

Xue Wang

Shichao Wang

Jiangwei Zhao

Ximing Xie

Liangliang Yang

Sufang Ouyang

Pengfei Lv

Nini Wang

Huiling Liu

Xia Zhao

Xinhe Kang

Wenjuan Sun

Bing Yan

Guojuan Zhang

Guixi Luan

Weipin Zhou

Provided is a copolymer rubber, comprising a copolymer having a star-shaped block structure (SIB-PA)-X, wherein SIB is a block comprising styrene, butadiene, and isoprene as constituent monomers; PA is a block comprising butadiene or isoprene as a constituent monomer; X is the residue of at least one coupling agent; and n=2-4. Also provided is a process for preparing the copolymer rubber and use thereof.

Copolymer rubber having a star-shaped block structure, the preparation process and use thereof

Disclosed herein are polybutadiene grafted isoprene rubber, processes for preparing polybutadiene grafted isoprene rubber, mixed compositions and vulcanized forms thereof.

Polybutadiene grafted isoprene rubber, processes for preparing polybutadiene grafted isoprene rubber, mixed compositions and vulcanized forms thereof

The method for preparation of polyisoprene includes conducting polymerization reaction of isoprene in a first organic solvent under the presence of rare earth catalyst I and rare earth catalyst II, to obtain polyisoprene with bimodal molecular weight distribution, wherein the polymerization reaction conditions are controlled to ensure the peak molecular weight of the high molecular weight component fraction in the polyisoprene is 1&#xd7;10-2&#xd7;10and the peak molecular weight of the low molecular weight component fraction is 2&#xd7;10-4&#xd7;10, and the weight ratio of content of the high molecular weight component fraction to the low molecular weight component fraction is 1-25:1. The molecular weight distribution of the polyisoprene obtained with the method provided is bimodal distribution; therefore, the polyisoprene not only has the mechanical properties of polyisoprene with high molecular weight, but also has the processability of polyisoprene with low molecular weight.

Polyisoprene, preparation method thereof, polyisoprene rubber compounds and vulcanizate therefrom

Disclosed are catalyst compositions for isoprene polymerization formed from components comprising (A) at least one titanium halide; (B) at least one organic aluminum compound comprising at least one alkyl aluminum of formula AlR, wherein each of the three Rs is independently chosen from linear and branched Calkyl groups; and (C) at least one electron donor comprising at least one polyether compound of formula (I) and/or at least one tetrahydro-furfuryl ether compound of formula (II). Also disclosed are processes for preparation of the catalyst compositions and processes using the catalyst compositions for isoprene polymerization.

Catalysts for polymerization of isoprene and preparations and uses thereof

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Beijing, China

Guozhu Yu