| 摘要 |
Interpolymers consisting of 99.90 to 99.995% by weight of vinyl chloride units and 0.10 to 0.005% by weight of diallyl maleate and/or diallyl fumarate units may be prepared by suspending mixtures of 99.90 to 99.995% of vinyl chloride and 0.10 to 0.005% of diallyl maleate and/or fumarate in aqueous media in the presence free radical liberating catalysts and heating under the autogenous pressure developed. Suspending agents, e.g. watersoluble vinyl acetate-maleic anhydride interpolymers and gelatin, may be used, and specified catalysts are lauroyl peroxide and benzoyl peroxide. The polymers may be compounded with plasticizers, e.g. di-2-ethylhexyl phthalate and diisodecyl phthalate, optionally together with hydrocarbon secondary plasticizers, fillers, e.g. clay and calcium carbonate, stabilizers, e.g. tribasic lead sulphate monohydrate and basic lead carbonate, lubricants, e.g. glyceryl triacetyl monoricinoleate and stearic acid, and bisphenol A. The compositions may be used for coating wires, e.g. for underground cables. |
