Verfahren zur Herstellung von Mischpolymerisaten

摘要

Copolymers of vinylidene cyanide and at least two other olefinically unsaturated monomers at least one of which forms an essentially 1 : 1 alternating two component copolymer when copolymerized with vinylidene cyanide, are made by polymerizing the monomers preferably in a solvent in the presence of a polymerization catalyst and optionally in the presence of a chain terminator. If desired one or more of the monomers may be added portionwise during the polymerization. The Specification contains an extensive list of monomers selected from the following classes:-mono-olefinic hydrocarbons including styrene and derivatives, halogenated mono-olefinic hydrocarbons, vinyl and vinyl substituted esters including acrylates, maleates and fumarates, mono-olefinically unsaturated organic acids and nitriles, diolefinically unsaturated hydrocarbons and substituted hydrocarbons. In the examples, copolymers of vinylidene cyanide with two or more monomers selected from vinyl acetate, ethylene, isobutylene, acrylonitrile, ethyl acrylate, chloroethyl acrylate, methyl methacrylate, styrene, o-chlorostyrene, vinylidene chloride, 2-chloroprene, butadiene-1,3, isoprene, chloroprene, 2-methyl butadiene-1,3, piperylene, and methyl pentadiene-1,3, are described. Solvents mentioned are benzene, chlorobenzenes, toluene, and methyl toluene. The catalyst may be a compound of the structure where R is a hydrocarbon radical, e.g. alpha, alpha1-azodisobutyronitrile, or a peroxy compound such as benzoyl, caproyl, lauroyl, acetone, or acetyl benzoyl peroxide, o,o1-dichlorobenzoyl or o,o1 - dibromobenzoyl peroxide, caprylyl, pelargonyl or tetrahydronaphthalene peroxide, cumene hydroperoxide or t.-butyl hydroperoxide, or a combination of sulphur dioxide or an inorganic acid, e.g. hydrochloric acid, with an organic mercaptan, e.g. benzenethiol, t.-butylthiol, p-thiocresol, and redox mixtures of these compounds. The copolymers may be made into fibres, filaments and films which may be colddrawn. Specifications 653,468; 667,276, 673,722, [both in Group IV (b)], 681,120, 683,655, 685,016 and 688,339 are referred to.