Abstract:
A composition of a vinyl chloride polymer or copolymer containing more than 50% vinyl chloride and a chlorinated polyolefin having a chlorine content of 20-50% and which has been obtained by chlorinating a polyolefin having a reduced viscosity of not less than 0,5 determined in a 0,5% solution of the polyolefin in tetrahydronaphthalene at 120 DEG C. in the presence of water at above 90 DEG C. Comonomers specified are vinyl acetate, propionate, butyrate, stearate, vinylidene chloride and acrylic, methacrylic and maleic alkyl esters. While low pressure polyethylene and ethylenepropylene copolymer are the specified polyolefins. Specification 828,938 is referred to.
Abstract:
Chlorine containing synthetic rubbers are obtained by chlorination of a polyolefin in an aqueous dispersion at a temperature above the agglomeration temperature of the unchlorinated polyolefin, followed by vulcanization (e.g. chemical or by irradiation), optionally in conjunction with partial dechlorination, dehydrochlorination or dehydration. Fillers, plasticizers and other synthetic rubbers also may be present. In examples the vulcanization is effected in the presence of magnesium stearate, magnesia, zinc oxide, sulphur, litharge, antimony pentasulphide and mercaptobenzothiazol. Specifications 828,938 and 882,524 are referred