Process for preparing graft copolymers by emulsion suspension graft polymerisation

摘要

Process for producing graft copolymers by polymerization of a monomer mixture composed of at least one vinylaromatic derivative and at least one acrylic or methacrylic derivative, of an elastomer containing ethylenic bonds characterized in that in a first step polymerized in aqueous emulsion the mixture of monomers in the presence of the elastomer in latex form dimensional until the ratio$$ is greater than 30%. "X" is the introduced monomer conversion expressed in percent of the total "a" expressed in parts by weight of said monomers and "b" being the amount of elastomer, expressed in parts by weight of dry matter, and that after a new addition of additional one-dimensional latex, the reaction is completed in a second step by a suspension polymerization.