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. % as determined by gas chromatography with an internal standard according to EN ISO 10283:2007-11.

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. % as determined by gas chromatography with an internal standard according to EN ISO 10283:2007-11.

The present invention is directed to a curable photochromic composition including (a) a photochromic compound; (b) a segmented polymer having active hydrogen groups, at least one first segment, and at least one second segment, wherein (i) each first segment independently includes a fluorinated polymer segment, and (ii) each second segment independently includes a segment selected from a polycarbonate segment, a polyester segment, a polyether segment, a polyurethane segment, and a segment of copolymers thereof; and (c) a curing agent having reactive functional groups that are reactive with the active hydrogen groups of the segmented polymer, wherein the curing agent includes at least one of a polyisocyanate, a polyisothiocyanate, or an aminoplast. Also provided are photochromic films and articles, including multilayer articles, which include the curable photochromic composition.

The present invention is directed to a curable photochromic composition including (a) a photochromic compound; (b) a segmented polymer having active hydrogen groups, at least one first segment, and at least one second segment, wherein (i) each first segment independently includes a fluorinated polymer segment, and (ii) each second segment independently includes a segment selected from a polycarbonate segment, a polyester segment, a polyether segment, a polyurethane segment, and a segment of copolymers thereof; and (c) a curing agent having reactive functional groups that are reactive with the active hydrogen groups of the segmented polymer, wherein the curing agent includes at least one of a polyisocyanate, a polyisothiocyanate, or an aminoplast. Also provided are photochromic films and articles, including multilayer articles, which include the curable photochromic composition.

Provided is an aqueous polyurethane resin composition which is excellent in finished appearance as well as excellent in impact resistance, such as chipping resistance, and adhesion.

The aqueous polyurethane resin composition includes a polyurethane resin obtained from at least (a) at least two types of organic diisocyanate compounds and/or polyisocyanate compounds which are different from each other, (b) a polyol compound; (c) an acidic group-containing compounds comprising at least two types of compounds which are a compound containing a carboxyl group as the acid group (a carboxyl group-containing compound) and a compound containing a sulfo group as the acid group (a sulfo group-containing compound); and (d) a chain extender of a polyamine compound, a diamine compound, a polyol compound and/or an alkanolamine compound with a molecular weight of not more than 400, in which the aqueous polyurethane resin composition has a viscosity of not less than 500 Pa.Math.s and not more than 50,000 Pa.Math.s when the polyurethane resin is contained in an amount of 65% by weight.

The invention relates to a method for producing flexible polyurethane foam, flexible polyurethane foam produced by the method, and its use in household articles and automobile articles.

A polyurethane resin composition includes a reaction product of an aliphatic polyisocyanate derivative having an average number of isocyanate groups of 2 or more; a long-chain active hydrogen compound including a hydrocarbon group having 12 or more and 30 or less carbon atoms and an active hydrogen group in combination; a cationic active hydrogen compound including an active hydrogen group and a cationic group in combination; and an acid compound capable of a salt with the cationic group. The concentration of the hydrocarbon group is 30% or more and 85% or less.

A polyurethane resin composition includes a reaction product of an aliphatic polyisocyanate derivative having an average number of isocyanate groups of 2 or more; a long-chain active hydrogen compound including a hydrocarbon group having 12 or more and 30 or less carbon atoms and an active hydrogen group in combination; a cationic active hydrogen compound including an active hydrogen group and a cationic group in combination; and an acid compound capable of a salt with the cationic group. The concentration of the hydrocarbon group is 30% or more and 85% or less.

A method for preparing a thermoplastic polyurethane film having a large thickness and excellent durability, and a thermoplastic polyurethane film prepared thereby are provided.

A method for preparing a thermoplastic polyurethane film having a large thickness and excellent durability, and a thermoplastic polyurethane film prepared thereby are provided.