Abstract: A thermoplastic material composite panel, comprising a transparent thermoplastic base layer, light conducting, having a thickness generally in the range 3-40 mm, and a light diffusing layer, having a thickness generally in the range 10-1500 micron, placed on one face of the base layer, said diffusing layer being characterized in that it contains barium sulphate in amount by weight, expressed as per cent ratio on the total weight of the diffusing layer, in the range 0.01-2%, the barium sulphate having average particle sizes in the range 0.1-50 micron, the composite sizes being-greater than or equal to 10 cm.

Abstract: Process for preparing copolymers of vinyl-aromatic monomers with ethylenically unsaturated nitriles having a very low content of unreacted residual monomers, consisting in adding to the polymerization dispersion, containing a compound capable of giving free radicals, and in the final step of the polymerization process, from 0.2 to 2% by weight of a comonomer which is reactive towards the unreacted monomers.

Abstract: Rubbery polymer latexes are agglomerated by mixing them with another latex containing:(1) a polymer, different from 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(2) a non-ionic surfactant consisting of an addition product of ethylene oxide.The agglomerating latex is added in quantities 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.A particular use of the agglomerated rubbery polymer latexes is in the production of ABS resins.