Process for the agglomeration of rubber latexes

Process for agglomerating latexes of rubbery polymers characterized in that, to the latex to be agglomerated there is added, under stirring and at a temperature higher than the glass transition temperature of the polymer to be agglomerated, a previously prepared agglomerating latex containing ( 1) a polymer, other than that present in the latex to be agglomerated and less lipophilic than the latter, selected from (a) homopolymers of alkyl acrylates and methacrylates in which the alkyl has from 1 to 12 carbon atoms, and (b) copolymers of ethylenically unsaturated monomers capable of forming water-insoluble homopolymers, and selected from the group consisting of copolymers formed from acrylic or methacrylic alkyl esters wherein the alkyl group contains from 1 to 12 carbon atoms, with styrene or acrylonitrile or acrylonitrile with butadiene, styrene or methyl-styrene and (2) a non-ionic surfactant consisting of an addition product of ethylene oxide, the agglomerating latex being added in a quantity corresponding to 0.1-20 parts by weight of solid polymer and to 0.0001-0.2. parts by weight of surfactant per 100 parts by weight of the rubbery polymer present in the latex to be agglomerated.