still for framstellning of a ymppolymer by grafting of styrene and acrylonitrile onto a rubbery polymer based on units herledda from butadiene, styrene and acrylonitrile

摘要

Impact resistant polymers having low permeability to gases and vapors which are useful materials for packaging of perishables are prepared by continuously adding the olefinic nitrile monomer and a vinyl aromatic monomer to a polymerization medium containing a latex of a rubber which is a polymer of a conjugated diene monomer, a vinyl aromatic monomer and an olefinic nitrile monomer.