Abstract: The invention relates to a method for recovering a diisocyanate that is solid at room temperature from a distillation residue originating from a production process of the diisocyanate, comprising the following steps: (i) mixing the distillation residue with at least one polyisocyanate on the basis of one or more diisocyanates different from the diisocyanate that is solid at room temperature, in such a way that a mixture is obtained that contains 70 to 90 wt. % of the distillation residue and 10 to 30 wt. % of the at least one polyisocyanate, each relative to the mixture, (ii) subjecting the mixture to distillation in a thin-film evaporator and/or a downflow evaporator, thereby obtaining a sump discharge and a gaseous product stream, and (iii) condensing the gaseous product stream and obtaining a solid containing the diisocyanate that is solid at room temperature, the at least one polyisocyanate in step (i) having a residual monomer content of ?3.0 wt.

Abstract: The invention relates to a method for extracting diisocyanates that are solid at room temperature from a distillation residue, comprising the following steps: (i) providing at least one residue containing diisocyanates that are solid at room temperature, and (ii) treating the residue at a temperature of ?120° C. to <200° C. so as to obtain diisocyanates that are solid at room temperature, the residue provided in step (i) containing ?32 to ?60 wt. % of bitumen and the treatment in step (ii) being carried out in at least one thin-film evaporator and/or falling-film evaporator.

Abstract: The invention relates to a method for recovering a diisocyanate which is solid at room temperature from a distillation residue from a process for producing the diisocyanate, comprising the following steps: (i) mixing the distillation residue with a bitumen such that a mixture is obtained which contains 70 to 90 wt % of the distillation residue and 10 to 30 wt % of the bitumen, each in relation to the mixture, (ii) distilling the mixture in a thin-film evaporator or a falling film evaporator to obtain a sump discharge and a gaseous product stream, (iii) condensing the gaseous product stream and obtaining a solid containing the diisocyanate which is solid at room temperature. The invention further relates to the use of a thin-film evaporator or falling film evaporator, to a composition containing the diisocyanate which is solid at room temperature, and to a method for producing an elastomer from this composition and to the elastomer itself.

Abstract: The present invention relates to a layer composite comprising an exposed photopolymer film and an adhesive layer which is connected to the photopolymer film at least in certain regions, wherein the photopolymer film comprises crosslinked polyurethane matrix polymers A), crosslinked writing monomers B) and a monomeric fluoroethane additive C), wherein the adhesive layer is in the form of a diffusion barrier for the fluoroethane additive C). The invention also relates to the use of the layer composite for producing chip cards, ID documents or 3D images, as a product protective label, as a label, in banknotes in the form of a strip or window or as holographically optical elements in displays.

Abstract: The present invention relates to a layer composite comprising an exposed photopolymer film and an adhesive layer which is connected to the photopolymer film at least in certain regions, wherein the photopolymer film comprises crosslinked polyurethane matrix polymers A), crosslinked writing monomers B) and a monomeric fluoroethane additive C), wherein the adhesive layer is in the form of a diffusion barrier for the fluoroethane additive C). The invention also relates to the use of the layer composite for producing chip cards, ID documents or 3D images, as a product protective label, as a label, in banknotes in the form of a strip or window or as holographically optical elements in displays.