Alkyl tetrahydrofurfuryl ethers as anionic polymerization modifi

Details Alkyl tetrahydrofurfuryl ethers as anionic polymerization modifi Alkyl tetrahydrofurfuryl ethers as anionic polymerization modifi

1993-07-22

1994-08-09

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526173, 526183, 526209, 526340, 5263402, 502156, C08F 448, C08F 450, C08F13608, C08F23610

Patent

active

053367391

ABSTRACT:
It has been unexpectedly discovered that various compounds, such as alkyl tetrahydrofurfuryl ethers, can be used to modify anionic polymerizations of conjugated diene monomers. These modifiers can be used to polymerize isoprene monomer into high 3,4-polyisoprene at excellent polymerization rates. This is in contrast to the modifiers such as tetramethylethylene diamine which are typically used to modify such polymerizations. This invention more specifically discloses a process for the synthesis of 3,4-polyisoprene which comprises polymerizing isoprene monomer in an organic solvent in the presence of a catalyst system which is comprised of (a) a lithium initiator and (b) a modifier which is an alkyltetrahydrofurfuryl ether selected from the group consisting of ethyltetrahydrofurfuryl ether, propyltetrahydrofurfuryl ether, and butyltetrahydrofurfuryl ether. In the practice of this invention, the utilization of ethyltetrahydrofurfuryl ether is highly preferred since its use results in faster polymerization rates and higher vinyl contents in the resultant polymer.

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patent: 4367325 (1983-01-01), Takeuchi et al.
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patent: 4554334 (1985-11-01), Yuki et al.
patent: 4647635 (1987-03-01), Hall
patent: 5112929 (1992-05-01), Hall
patent: 5231153 (1993-07-01), Hsu et al.

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