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

US8940838B2 · kind B2 · utility

Assignees

• CHINA PETROLEUM & CHEMICAL CORPORATION · CN
• BEIJING RESEARCH INSTITUTE OF CHEMICAL INDUSTRY, CHINA PETROLEUM & CHEMICAL CORPORATION · CN

Inventors

• Aimin Liang · Beijing, CN
• Jie Zhang · Beijing, CN
• Jiangwei Zhao · Beijing, CN
• Chuanqing Li · Nanhu, CN
• Lin Xu · Zhoushan City, CN
• Ximing Xie · Beijing, CN
• Guozhu Yu · Beijing, CN
• Sufang Ouyang · Beijing, CN
• Jinmei Tan · Beijing, CN
• Liangliang Yang · Beijing, CN
• Wei Sun · Changsha, CN
• Yishuang Xin · Beijing, CN

Key dates

• Filing date: May 28, 2013
• Grant date: Jan 27, 2015
• Expiry date: May 28, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L9/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

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 1×106-2×106 and the peak molecular weight of the low molecular weight component fraction is 2×105-4×105, 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.