method for the preparation of synthetic rubber latex which contains a filling, as well as the thus prepared latex manufactured articles

摘要

An aqueous dispersion contains particles which comprise a mixture of butadiene hydrocarbon polymer and particles of a resinous polymer and/or particles of inorganic reinforcing pigment. The dispersion is made by alternately freezing and thawing as in Specification 758,622 a mixture of butadiene polymer latex and a polymer latex and/or pigment dispersion, the emulsifier present in the mixture being insufficient to completely cover the surface area of the particles of the mixture. The term butadiene hydrocarbon polymer is defined as any polymer containing at least 51% of a 1,3-diene. Exemplified reinforcements are highstyrene resin latex, vinylidene chloride-ethyl-acrylate copolymer latex, styrene-acrylonitrile copolymer latex, silica dispersion and a clay dispersion. The resulting latices may be foamed, moulded and vulcanized. The products have improved hot set properties.ALSO:Latex foams are made by beating air into an aqueous dispersion containing particles which comprise a mixture of butadiene hydrocarbon polymer and particles of a resinous polymer and/or particles of inorganic reinforcing pigment. The dispersion is made by alternately freezing and thawing a mixture of polymer latex as in Specification 758,622 a mixture of butadiene polymer latex and polymer latex and/or pigment dispersion, the amount of emulsifier present in the mixture being insufficient to completely cover the surface area of the particles of the mixture. The term butadiene hydrocarbon polymer is defined as any polymer containing at least 51% of a 1, 3-diene. The foams may be gelled and vulcanised.