C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/2055
C08F 295/00 (2006.01)
Patent
CA 1118931
ABSTRACT OF THE DISCLOSURE: The present invention relates to a process for the preparation of three-block copolymers of the type ABA or ABC wherein A and C represent polymeric blocks of homopolymers of styrene or substituted styrene and B represents blocks of polymers of polyisobutylene, said process being carried out in a single reactor at a temperature of from -80°C to -20°C by: polymerizing a monomer of block A in the presence of a catalyst which is a Lewis acid united to co-catalytic amounts of isobu- tene; adding the monomer of block B on completion of the poly- merization of block A until the block is completely polymerized; and adding and polymerizing the monomer of the block C by cataly- tic action of a compound having the formula AlR2X, wherein R is a hydrogen atom or a hydrocarbonaceous radical of up to 8 carbon atoms, and wherein X is the same as R or is a halogen atom. This invention is also directed to the copolymers thus obtained. The fields of use of the three-block copolymers are those which are typical of the thermoplastic elastomers.
317480
Anic S.p.a.
Robic Robic & Associes/associates
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