GB929584A - Improvements in the manufacture of shaped articles - Google Patents

Abstract

Light-coloured shaped articles are manufactured by mixing a polythioamine of formula R1R2NSSNR3R4 wherein R1, R3, R3 and R4 each represent an alkyl group, o substituted alkyl group, an alicyclic group, or wherein R1 and R2 or R3 and R4 when taken together with their adjacent nitrogen atoms, form at least part of heterocyclic rings, with an aqueous dispersion of a vulcanizable natural or synthetic rubber, shaping the composition and heating till vulcanization occurs. The preferred agent is dimorpholine disulphide. Other conventional additives may be used in the latices. The latex may be used to form thread by conventional extrusion techniques or foamed compositions (see Group V). Example VIII uses a mixture of natural and GRS rubber latices.ALSO:Light-coloured foamed vulcanisates may be made by mixing a natural or synthetic rubber latex with a polythioamine of formula R1R2NSSNR3R4 wherein R1R2, R3 and R4 each represent an alkyl, substituted alkyl or alicyclic group or wherein R1 and R2 or R3 and R4 taken together with their adjacent nitrogen atoms form at least part of heterocyclic rings, foaming the composition by heating air in, pouring into moulds and heating to vulcanise. The preferred agent is dimorpholine disulphide. Other conventional additives are used in the latices.