Solvatization of linear polyurethane-materials via caprolactam/alcohole mixtures

Abstract

The present invention relates to a process for recovering an elastic polyurethane from a composition comprising an elastic polyurethane foam comprising the steps of providing a composition comprising a polyurethane foam; heating the composition comprising a polyurethane foam to a temperature in the range of from 140° C. to 220° C., and bringing the composition comprising the polyurethane foam into contact with a solvent mixture (SM) comprising at least one alcohol and at least one compound (A1) selected from the group consisting of cyclic amides at a temperature below the boiling point of the alcohol to obtain a solution (S1) which is enriched in dissolved polyurethane. The present invention also relates to the polyurethane obtained or obtainable according to said process as well as the use of the polyurethane according to the present invention for the preparation of a shaped article.

Dependencies are inferred from the claim text.