Process for the manufacture of impact resistant styrene...

Details Process for the manufacture of impact resistant styrene... Process for the manufacture of impact resistant styrene...

C - Chemistry, Metallurgy

08

L

400/2037

C08L 51/04 (2006.01) C08F 255/06 (2006.01)

Patent

CA 1090500

Abstract of the disclosure: There is disclosed a process for preparing impact resistant styrene graft copolymers having improved properties, especially an excellent combination of toughness, hardness and gloss. They are obtained by polymerizing a solution of an ethylene-propylene- tercomponent rubber in a mixture of styrene and acrylonitrile in one step (mass polymerization) or two steps (mass/suspension poly- merization) in the presence of an organic peroxide and subjec- ting the copolymer obtained to a shear extrusion yielding rubber particles with an average size below 1 µm and thereafter cross- linking said rubber particles, care being taken that an amount of 0.02 to 0.5 weight % of a cross-linking initiator is present when cross-linking starts.

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