Patent ID: 8138232

Claim:
Method for recycling plastic materials which contain at least two polymers, copolymers or blends thereof, each of which is based on polystyrene in which a) the plastic material is mixed with at least one solvent for the polymers, copolymers or blends thereof b) at least one precipitant which is miscible with the at least one solvent is added to the solution of the polymers, copolymers or blends thereof for precipitation of the at least one polymer, copolymer or blend thereof in gelatinous form, the at least one precipitant and/or the quantity thereof being chosen such that the mixture of solvent and precipitant has a value for the hydrogen bonding strength δ H of the Hansen solubility parameter of 10 to 15 √{square root over (MPa)} and c) at least two gelatinous precipitation products, each with different adhesion properties, are separated from each other by thoroughly mixing so that the adhesion forces outweigh the dispersion energy supplied by the thorough mixing so that the at least two gelatinous precipitation products are demixed completely from each other and the further components of the plastic material.