Process for the production of hydroxyl-group-containing compounds from polyurethane polyurea and/or polyurea wastes
AssigneeBayer Aktiengesellschaft
InventorsThomas Munzmay, Werner Rasshofer, Walter Meckel
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the production of hydroxyl-group-containing compounds suitable for the polyisocyanate polyaddition process from polyurea and/or polyurethane polyurea wastes by treating polyurea and/or polyurethane polyurea wastes with diols and/or polyols at temperatures from 160.degree. to 260.degree. C., the water present in the reaction vessel preferably being removed by distillation during the heating-up phase, characterized in that 1,3-dicarbonyl compounds are added to the reaction mixture before or during the reaction.
Claims2
Process for the production of hydroxyl-group-containing compounds suitable for the polyisocyanate polyaddition process from polyurethane polyurea and/or polyurea wastes by treating polyurethane polyurea and/or polyurea wastes with diols and/or polyols at temperatures from 160.degree. to 260.degree. C. in amounts such that the weight ratio of polyurethane polyurea and/or polyurea waste to diols and/or polyols is 10:1 to 1:100, any water present in the reaction vessel being removed by distillation optionally during the heating-up phase, characterised in that 1,3-dicarbonyl compounds are added to the reaction mixture before or during reaction of the wastes with the diols and/or polyols.
Dependencies are inferred from the claim text.