Method of polymerization in emulsion for the preparation of polymers and copolymers of methyl styrene-b-acrylate methacrylate and method of preparation of plastisols and organosols on the basis of the polymers and copolymers obtained

摘要

P the invention relates to the polymer materials. / p & & p & it relates to a method of polymerization in emulsion for the preparation of polymers of methyl methacrylate and of copolymers containing at least 60% by weight of methyl methacrylate, according to which it is added in successive portions in two steps or more, in water, at least one monomer which is of the methyl methacrylate in the same time as a polymerization initiator and a chain transfer agent, so that at least the major part of the monomer is added in a given step is consumed before the addition of the next portion, and b are isolated, the resulting polymer. This process is characterized in that step is carried out in the absence of any emulsifying agent or surfactant - active, and step b is carried out at a temperature of at least 30°C. to the glass transition temperature of the polymer. / p & & p & the product obtained is useful for the preparation of plastisols and organosols. / p