Process for manufacturing isoprene containing block copolymers

Details Process for manufacturing isoprene containing block copolymers Process for manufacturing isoprene containing block copolymers

1996-08-19

1998-04-07

Zemel, Irina S.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

22250, 22316, C08F29704

Patent

active

057366128

ABSTRACT:
Process for manufacturing block copolymers derived from predominantly styrene and predominantly isoprene, used in the form of an isoprene concentrate obtainable by contacting an isoprene concentrate, obtainable by removal of piperylene from a gasoline pyrrolysis fraction of hydrocarbons having 5 carbon atoms, with finely dispersed alkali metal and/or alkaline earth metal, and separating it from the free and bound metal, said process comprising at least the steps of polymerizing predominantly styrene monomer in an inert non-aromatic hydrocarbon solvent in the presence of a monofunctional organolithium initiator, adding predominantly isoprene monomer in the form of pretreated isoprene concentrate to the polymerization mixture, either adding a coupling agent to couple a predominant part of the living diblock copolymer or adding a second portion of predominantly styrene monomer, and adding a terminating agent.

REFERENCES:
patent: 5171791 (1992-12-01), Marchand et al.
patent: 5242984 (1993-09-01), Dillman et al.
patent: 5296547 (1994-03-01), Nestegard et al.
patent: 5447995 (1995-09-01), Hoxmeier et al.
Encyclopedia of Polymer Science and Engineering, J. Wiley & Sons, 1985, v2, pp. 6-7.

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