Method for the preparation of graft copolymers by emulsion...

Details Method for the preparation of graft copolymers by emulsion... Method for the preparation of graft copolymers by emulsion...

C - Chemistry, Metallurgy

08

F

400/2029

C08F 279/02 (2006.01) C08F 2/22 (2006.01)

Patent

CA 1249684

ABSTRACT OF THE DISCLOSURE: Graft copolymers are prepared by means of a two- step polymerization process, in emulsion: in the first step, a vinylaromatic monomer and an acryl or metacryl monomer are grafted on a monomodal polybutadiene latex constituted of particles of diameter comprised within the range of from 800 to 2500 .ANG.. The polymerization/grafting reaction is continued up to a 70-90% conversion, at which time a further portion of monomodal polybutadiene is added, together with further amounts of monomers, always in emulsion. This process advantageously permits to pre- pare graft copolymers containing from 10 to 70% of polybu- tadiene that can be used as such for preparing ABS resins, without havint to resort to agglomeration techniques.

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