A high-quality artificial leather is described, having a suede appearance and colors within the grey-black range, the light fastness of the colors according to the method SAE J 1885 225.6 KJ/m.sup.2 being higher than or equal to 4; the lightfastness of the colors according to the method SAE J 1885 488.8 KJ/m.sup.2 being not lower than 3; said artificial leather having a tassel on the surface of the leather itself. The average length of the tassel is between 200 and 500 microns. The soft segments consist of at least one polycarbonate diol selected from polyalkylene carbonate diols and at least one polyester diol; the hard segments consist of urethane groups deriving from the reaction between free isocyanate groups and water; and the total content of carbon black is between 0.025 and 6% by weight.

A high-quality artificial leather is described, having a suede appearance and colors within the grey-black range, the light fastness of the colors according to the method SAE J 1885 225.6 KJ/m.sup.2 being higher than or equal to 4; the lightfastness of the colors according to the method SAE J 1885 488.8 KJ/m.sup.2 being not lower than 3; said artificial leather having a tassel on the surface of the leather itself. The average length of the tassel is between 200 and 500 microns. The soft segments consist of at least one polycarbonate diol selected from polyalkylene carbonate diols and at least one polyester diol; the hard segments consist of urethane groups deriving from the reaction between free isocyanate groups and water; and the total content of carbon black is between 0.025 and 6% by weight.

The present invention relates to aqueous polyurethane dispersions comprising pentamethylene diisocyanate and to coatings obtainable therefrom. Said coatings, given a high density of urethane and urea groups, are softer than coatings that are obtained with polyurethane dispersions comprising other aliphatic diisocyanates, for example hexamethylene diisocyanate.

Aqueous polyurethane dispersions are useful for making artificial leather and similar products. The dispersions contain polyurethane-urea particles dispersed in an aqueous phase. The particles are made using isophorone diisocyanate, certain cyclic amine chain extenders and certain polyol mixtures.

An artificial leather having a suede appearance and colours within the grey-black range and high colour fastness comprising a microfibrous component and an elastomeric matrix; the microfibrous component consisting of polyester microfibres having a count of 0.01 to 0.50 dtex; the elastomeric matrix consisting of polyurethane consisting of soft and hard segments; the ratio between the elastomeric matrix and the microfibrous component ranging from 20/80 and 50/50 by mass; the microfibrous component containing carbon black pigment in a percentage of 0.05 to 2.00% by mass; the elastomeric matrix containing carbon black pigment in a percentage of 0 to 10% by weight; the carbon black always having an average dimension smaller than 0.4 microns. The average length of the tassel is between 200 and 500 microns. The soft segments consist of at least one polycarbonate diol selected from polyalkylene carbonate diols and at least one polyester diol. The hard segments consist of urethane groups deriving from the reaction between free isocyanate groups and water. The total content of carbon black is between 0.025 and 6% by weight.

The disclosure provides a new method for preparing a WPU synthetic leather foaming layer based on a Pickering foam template method. The key of the method is to use the soft waterborne polyurethane as raw materials, add waterborne crosslinking agent and hydrophobic inorganic solid particles as Pickering waterborne foam stabilizers to obtain Pickering waterborne foam slurry of polyurethane latex particles through high-speed emulsification; and dry the slurry to obtain the waterborne polyurethane foam layer. The preparation process does not use any organic solvents, is clean and environmentally-friendly, and is simple to operate, making it easier to realize industrialized production. In addition, the Pickering foam has strong interface stability, which effectively solves the problem of difficult adjustment of the pore size caused by the accumulation and collapse of bubbles during the drying process of the mechanical foaming method, and the prepared synthetic leather foam layer has good hygienic properties.

A polyurethane resin composition containing an isocyanate-terminated urethane prepolymer (E) or a reaction product of an isocyanate-terminated urethane prepolymer (E) and a chain extender (G), and a neutralizing agent (F), wherein the isocyanate-terminated urethane prepolymer (E) includes a reaction product of: a polyol (A1) including a polycarbonate polyol (B1) having an ester bond and an average hydroxyl group functionality of more than 2; an organic acid (C); and a polyisocyanate (D), and wherein the content of the polycarbonate polyol (B1) or the content of urea groups derived from the chain extender (G) satisfies a specific condition.

There is provided an aqueous polyurethane dispersion that makes it possible to prepare an adhesive, a paint, and the like capable of forming an adhesion layer as a cured film whose physical properties such as strength are unlikely to be changed even by a change in temperature, the aqueous polyurethane dispersion having excellent storage stability. The aqueous polyurethane dispersion is an aqueous polyurethane dispersion containing: resin particles formed with a polyurethane having a hydroxy group at a terminal thereof; and water as a dispersion medium, wherein the polyurethane has a structure derived from a urethane prepolymer, the urethane prepolymer has a constituent unit derived from a polyol containing a polyether polyol; a constituent unit derived from a polyisocyanate containing an aliphatic polyisocyanate and an alicyclic polyisocyanate; and a constituent unit derived from an acidic group-containing polyol, the polyurethane has an acid value of 30 mgKOH/g or lower, the polyol further contains a polycarbonate polyol, and the mass ratio of the polyether polyol (C) to the polycarbonate polyol (D), (C):(D), is 20:80 to 95:5.

There is provided an aqueous polyurethane dispersion that makes it possible to prepare an adhesive, a paint, and the like capable of forming an adhesion layer as a cured film whose physical properties such as strength are unlikely to be changed even by a change in temperature, the aqueous polyurethane dispersion having excellent storage stability. The aqueous polyurethane dispersion is an aqueous polyurethane dispersion containing: resin particles formed with a polyurethane having a hydroxy group at a terminal thereof; and water as a dispersion medium, wherein the polyurethane has a structure derived from a urethane prepolymer, the urethane prepolymer has a constituent unit derived from a polyol containing a polyether polyol; a constituent unit derived from a polyisocyanate containing an aliphatic polyisocyanate and an alicyclic polyisocyanate; and a constituent unit derived from an acidic group-containing polyol, the polyurethane has an acid value of 30 mgKOH/g or lower, the polyol further contains a polycarbonate polyol, and the mass ratio of the polyether polyol (C) to the polycarbonate polyol (D), (C):(D), is 20:80 to 95:5.