Isotactic 3,4-isoprene-based polymer

Details Isotactic 3,4-isoprene-based polymer Isotactic 3,4-isoprene-based polymer

2005-03-04

2008-08-26

Lu, Caixia (Department: 1796)

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S131000, C526S134000, C526S170000, C526S335000

Reexamination Certificate

active

07417103

ABSTRACT:
The present invention provides 3,4-isoprene-based polymer with high regioregularity, in particular high tacticity.Specifically, the present invention provides an isoprene-based polymer, including a structural unit represented by Formula (I) in Claims, wherein the isotacticity of an arrangement of the structural units is 99% mmmm or more in terms of pentad content. Further, the present invention provides a production method for the isoprene-based polymer, which comprises polymerizing an isoprene-based compound in the presence of a polymerization catalyst containing a complex represented by the following Formula (A) in Claims.

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Nakayama et al., Macromolecules, vol. 36, No. 21, pp. 7953-7958, 2003.

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