Method for producing a polyisobutene

Details Method for producing a polyisobutene Method for producing a polyisobutene

2006-10-13

2010-06-29

Wu, David (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S209000, C526S135000, C526S131000, C526S348700

Reexamination Certificate

active

07745554

ABSTRACT:
The invention relates to a process for preparing polyisobutene having a mean molecular weight Mnof from 400 to 50 000, in particular from 500 to 10 000, by polymerizing isobutene in the presence of a BF3-containing complex catalyst, wherein the polymerization is carried out at least temporarily in the presence of one or more cyclic ethers.

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U.S. Appl. No. 12/598,934, filed Nov. 5, 2009, Tishkov et al.

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