Mechanochemical process for the production of valuable products free from persistent organic pollutants and other organohalogen compounds from waste of plastics and plastic laminates which are pure in type and not pure in type, wherein the wastes are selected from the group consisting of thermoplastic polymers, polycondensation resins and (co)polymers and mixtures thereof which are contaminated with persistent organic pollutants and/or contain other organohalogen compounds, characterized in that (i) the wastes are comminuted so that a particle size distribution as narrow as possible results, (ii) the comminuted wastes are loaded into a mill containing milling balls and further comminuted by milling, (iii) at least one dehalogenating agent is added in a molar excess with respect to the amounts of present persistent organic pollutants, if containing organohalogens, and/or other organohalogen compounds, (iv) the mixture of milled comminuted waste and dehalogenating agent is milled further and the milling is ceased after a preselected time, (v) the resulting valuable products free of persistent organic pollutants and other organohalogen compounds are separated from the milling balls and the resulting halogen-containing water-soluble products are separated by washing with aqueous solvents and/or the resulting halogen-containing water-insoluble products are not washed out but left as fillers in the valuable products; and (vi) the washed valuable products after drying as well as the unwashed valuable products are checked whether they still contain persistent organic pollutants and/or other organohalogen compounds, wherein (vii) before and/or after process step (iv), at least one additive selected from the group consisting of reactive diluents curable thermally and/or with actinic radiation, low-boiling organic solvents and high-boiling organic solvents ("long solvents"), water, UV absorbers, light stabilizers, radical scavengers, thermolabile radical initiators, photoinitiators and photo-coinitiators, crosslinking agents as used in one-component systems, catalysts for thermal crosslinking, deaerating agents, slip additives, polymerisation inhibitors, defoamers, emulsifiers, wetting and dispersing agents and surfactants, adhesion promoters, levelling agents, film forming aids, sag control agents, rheology controlling additives (thickeners), flame retardants, siccatives, drying agents, skin prevention agents, corrosion inhibitors, waxes, matting agents, reinforcing fibres, nanoparticles, microparticles, sands, precursors of organically modified ceramic materials, phyllosilicates, polyoxometalates, inert gases, frozen gases, frozen liquids and liquids and reactive gases and liquids which (co)polymerize with the resulting and formed valuable products, excited oxygen, organic and inorganic peroxides and ozone, is added. (i) the wastes are comminuted so that a particle size distribution as narrow as possible results, (ii) the comminuted wastes are loaded into a mill containing milling balls and further comminuted by milling, (iii) at least one dehalogenating agent is added in a molar excess with respect to the amounts of present persistent organic pollutants, if containing organohalogens, and/or other organohalogen compounds, (iv) the mixture of milled comminuted waste and dehalogenating agent is milled further and the milling is ceased after a preselected time, (v) the resulting valuable products free of persistent organic pollutants and other organohalogen compounds are separated from the milling balls and the resulting halogen-containing water-soluble products are separated by washing with aqueous solvents and/or the resulting halogen-containing water-insoluble products are not washed out but left as fillers in the valuable products; and (vi) the washed valuable products after drying as well as the unwashed valuable products are checked whether they still contain persistent organic pollutants and/or other organohalogen compounds, wherein (vii) before and/or after process step (iv), at least one additive selected from the group consisting of reactive diluents curable thermally and/or with actinic radiation, low-boiling organic solvents and high-boiling organic solvents ("long solvents"), water, UV absorbers, light stabilizers, radical scavengers, thermolabile radical initiators, photoinitiators and photo-coinitiators, crosslinking agents as used in one-component systems, catalysts for thermal crosslinking, deaerating agents, slip additives, polymerisation inhibitors, defoamers, emulsifiers, wetting and dispersing agents and surfactants, adhesion promoters, levelling agents, film forming aids, sag control agents, rheology controlling additives (thickeners), flame retardants, siccatives, drying agents, skin prevention agents, corrosion inhibitors, waxes, matting agents, reinforcing fibres, nanoparticles, microparticles, sands, precursors of organically modified ceramic materials, phyllosilicates, polyoxometalates, inert gases, frozen gases, frozen liquids and liquids and reactive gases and liquids which (co)polymerize with the resulting and formed valuable products, excited oxygen, organic and inorganic peroxides and ozone, is added.