USE OF RED TO NEAR-INFRARED HEAT-GENERATING ORGANIC DYES FOR REPROCESSING/RECYCLING POLYMERS

摘要

The present invention relates to a process for bringing a polymer composition above a threshold temperature on demand, wherein:the polymer composition comprises 0,01 to 0,5% weight of at least one heat-generating organic dye that generates heat above the threshold temperature when exposed to a given range of red to near-infrared irradiation, andthe process comprises exposing the polymer composition to red to near-infrared irradiation at a wavelength within the red to near-infrared range where the heat-generating organic dye generates heat above the threshold temperature, the weight % being expressed with respect to the total weight of the polymer composition. The threshold temperature may be the glass transition temperature, the depolymerization temperature, the melting temperature, or the decomposition temperature of the polymer composition.;The invention also relates to the use of a heat-generating organic dye adsorbing in the red to near-infrared, for reshaping a thermoplastic polymer article; bonding together two thermoplastic polymer or elastomer articles; separating two pieces of a thermoplastic polymer or elastomer article; self-healing or self-repairing a thermoplastic polymer article; recycling a composite polymer composition; recycling or depolymerizing a polymer; and/or separating two articles bonded by a polymer layer.