VERFAHREN ZUR AUFBEREITUNG VON INSBESONDERE POLYETHYLEN-VERBUNDFOLIEN, ZU WIEDERVERWENDBAREN ROHSTOFFEN

摘要

In order to convert polyolefin-containing used articles into reusable raw materials, in particular for the conversion of articles comprising polyethylene composites, preferably composite films for packaging purposes, having a plurality of layers, of which at least one first layer comprises polyethylene and at least one second layer comprises the same polyethylene, a similar polyethylene, another polymer or another material, for example aluminium, the used articles are cut into pieces, and the pieces are brought into contact with a solvent with vigorous agitation in at least one solvent bath containing an organic solvent. In the case of composites containing a coupling agent (adhesion promoter) between the individual layers of the composite, which comprises relatively high-percentage copolymers or terpolymers of polyethylene with acrylic acid and derivatives thereof, and relatively high-percentage ethylene-vinyl acetate copolymers, a solvent is used which causes the coupling agent to swell, for example low-boiling esters of acetic acid.