Process of preparing high-purity polypropylene recyclates

A process of preparing a polymer composition comprising a post-consumer recycled polypropylene resin comprising the steps of

• M) pre-treating a plastic feedstock by subjecting the plastic feedstock to mechanical recycling process, comprising sieving, sorting by at least one of polymer type, polymer article form, and/or color, shredding, and optionally cleaning, e.g. washing, the plastic feedstock to obtain a pre-treated plastic feedstock;
• S) subjecting the pre-treated plastic feedstock to solvent-based recycling process to obtain the post-consumer recycled polypropylene resin accomplished by dissolving a plastic feedstock comprising polypropylene in a solvent and separating non-dissolved components and soluble impurities, wherein step S) comprises
• S-a) a dissolution step in which the pre-treated plastic feedstock is placed in contact with a dissolution solvent at a dissolution temperature of between 100° C. and 300° C. and a dissolution pressure of between 1.0 and 20.0 MPa abs, to obtain at least one, crude polymer solution, wherein the dissolution solvent is chosen from organic solvents comprising one or more hydrocarbons with a boiling point of between 75° C. and 250° C., to obtain at least one crude polymer solution;
• S-b) optionally a step of adsorption by placing the crude polymer solution obtained from step S-a) in contact with at least one adsorbent, at a temperature of between 10° and 300° C. and a pressure of between 1.0 and 20.0 MPa abs, to obtain at least one refined polymer solution;
• and
• S-c) a step of recovering polymers to obtain at least one solvent fraction and one purified polymer fraction;
• and
• C) melt-processing the post-consumer recycled polypropylene resin obtained from
• step S), wherein step C) comprises
• C-a) further separating solvent from the purified polymer fraction, and
• C-b) melt-processing the purified polymer fraction
• to obtain said polymer composition.