Process for preparing copolymers

Details Process for preparing copolymers Process for preparing copolymers

C - Chemistry, Metallurgy

08

F

402/488

C08F 2/18 (2006.01) C08F 212/10 (2006.01) C08F 212/12 (2006.01)

Patent

CA 1157999

- 1 - Process for preparing copolymers Abstract The invention relates to emulsion polymerization of an .alpha.-alkylstyrene and an unsaturated nitrile copolymeriz- able therewith to form a copolymer having good heat- resistance. The monomers are reacted in a weight proportion of 70 : 30 to 80 : 20, respectively, in the presence of a radical initiator, and the monomers are introduced into the reaction system in such a manner that the concentration of the unsaturated nitrile remaining unreacted in the reaction system is not less than 31 % by weight of the entire amount of the monomers remaining unreacted in the reaction system at the completion of the introduction of the monomers. The resulting copolymer of the .alpha.-alkylstyrene and the unsaturated nitrile has good thermal resistance and is produced with a marked decrease of the monomers remaining unreacted.

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