Anionic polymerization of conjugated dienes modified with alkylt

Details Anionic polymerization of conjugated dienes modified with alkylt Anionic polymerization of conjugated dienes modified with alkylt

1992-04-06

1993-07-27

Teskin, Fred

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

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526173, 526180, 526337, 526340, 5263402, 502155, 502156, C08F 448, C08F 3606, C08F 3608

Patent

active

052311538

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) ethyltetrahydrofurfuryl ether.

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patent: 3847883 (1974-11-01), Kamienski et al.
patent: 4367325 (1983-01-01), Takeuchi et al.
patent: 4429091 (1984-01-01), Hall
patent: 4554334 (1985-11-01), Yuki et al.
patent: 4647635 (1987-03-01), Hall
patent: 5112929 (1992-05-01), Hall

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