PROCEDIMIENTO DE PREPARACION DE COPOLIMEROS INJERTADOS.

摘要

1521192 Graft polymerization process PRODUITS CHIMIQUES UGINE KUHLMANN 29 Jan 1976 [3 Feb 1975] 3574/76 Heading C3P A graft polymer is prepared by graft polymerization of a mixture of at least two monomers in the presence of an elastomer which is soluble in at least one of the monomers, but insoluble in the mixture of all the monomers, by a process wherein at least part of the elastomer is dissolved in a solubilizing medium consisting of at least part of at least one of the monomers of the said mixture, the prepolymerization is initiated and prior to the phase inversion any fractions of elastomer or of the monomer or monomers which have not been introduced during the initial dissolving operation are added to the reaction mixture at such a rate that the elastomer is not precipitated, the graft polymerization being continued after the phase inversion according to any known process. Examples are given in which (a) ethylene-propylene-ethylidene norbornene elastomer is dissolved in styrene, thermal polymerization is initiated, acrylonitrile is added and polymerization is continued with optional additions of a further amount of acrylonitrile until phase inversion occurs, after which polymerization is completed in bulk or suspension; (b) ethylene-propylene-dicyclopentadiene elastomer is dissolved in styrene, acrylonitrile and a peroxy catalyst are added, prepolymerization is carried out with a further addition of acrylonitrile and polymerization completed in suspension; (c) a mixture of ethylene-propylene-ethylidene norbornene and butadiene-styrene elastomers is dissolved in styrene, lauroyl peroxide and acrylonitrile are added, prepolymerization is carried out with further additions of styrene and acrylonitrile and polymerization is completed in suspension; (d) ethylene-propylene-ethylidene norbornene elastomer is dissolved in styrene and alphamethyl styrene, heated, methyl nethacrylate is added, prepolymerization is carried out with the addition of more methyl methacrylate and polymerization is completed in suspension.