The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2010
Filed:
Jul. 20, 2007
Jian-feng Chen, Beijing, CN;
Hua Gao, Beijing, CN;
Yi-xian Wu, Beijing, CN;
Hai-kui Zou, Beijing, CN;
Guang-wen Chu, Beijing, CN;
Lei Zhang, Beijing, CN;
Jian-Feng Chen, Beijing, CN;
Hua Gao, Beijing, CN;
Yi-Xian Wu, Beijing, CN;
Hai-Kui Zou, Beijing, CN;
Guang-Wen Chu, Beijing, CN;
Lei Zhang, Beijing, CN;
Beijing University of Chemical Technology, Beijing, CN;
Abstract
This invention puts forward a process of preparing butyl rubber. High gravity devices are used as polymerization reactor. The mixture of isomonoolefin and conjugated diolefin monomers and the diluent, and the mixture of the initiator and diluent are pumped at a certain ratio into a high-gravity reactor to conduct cationic polymerization in the high-gravity environment. After polymerization, the monomers and the diluent are removed from the product to obtain butyl rubber polymers with number-average molecular weight of 80000˜300000 and molecular weight distribution index of 1.9˜3.6. The high gravity polymerization method of this invention can tremendously intensify micro-mixing, mass transfer and heat transfer in the reaction. Compared to the conventional stirred polymerization method, this invention features small reactor volume, at least 30-fold shorter residence time of substances in the high gravity reactor, low cost, low energy consumption and high production efficiency.