A problem to be solved by the invention is to provide a method for producing leather-like sheets with excellent chemical resistance and discoloration resistance utilizing an aqueous urethane resin composition. The invention provides a method for producing a leather-like sheet in the form of a laminate including a film, the method including forming the film by applying an aqueous urethane resin composition onto a substrate and drying the composition, the aqueous urethane resin composition including a urethane resin, a nonionic emulsifier and an aqueous medium, the urethane resin being one obtained by reacting a polyol including a carboxyl group-containing polyol, an aromatic polyisocyanate and a chain extender, the urethane resin having a urea bond content of not more than 0.3 mol/kg. The film is preferably used as a skin layer and/or a topcoat layer of the leather-like sheet.

A binder dispersion includes water and polyurethane. The polyurethane is formed from polyisocyanate; polyol having two hydroxyl (OH) groups at one chain end, no OH groups at an opposed chain end, and a number average molecular weight (M.sub.n) ranging from 500-5,000; an alcohol, diol or amine having a M.sub.n<500; and one of i) a carboxylic acid; ii) a sulfonate or sulfonic acid having one amino group; iii) i and ii; iv) i and a homopolymer or copolymer of poly(ethylene glycol) (PEG) having one or two OH or amino groups at one chain end; v) ii and a homopolymer or copolymer of PEG having one or two OH or amino groups at one chain end; or vi) i, ii, and a homopolymer or copolymer of PEG having one or two OH or amino groups at one chain end.

A polyurethane obtainable by reacting a polyisocyanate, a polyol, and/or a chain extender, wherein at least one of the polyisocyanate and chain extender comprises a C14 to C32 alkyl group. The polyurethane is particularly suitable for use in coating, elastomer and adhesive/sealant compositions.

The present invention relates to radiation-curable, aqueous dispersions based on polyurethane acrylates (i), which are characterized in that the polyurethane acrylate (i) comprises as builder components A) one or more aromatic polyepoxy(meth)acrylates with an OH number of from 20 to 300 mg of KOH/g of substance, C) one or more oligo- or polyesters containing unsaturated fatty acids with an OH number of from 15 to 300 mg of KOH/g of substance and an iodine number of greater than 50 g of I.sub.2/100 g of substance, E) one or more compounds with at least one group which is reactive towards isocyanate and additionally at least one group having a hydrophilizing action and F) one or more organic polyisocyanates, a process for the preparation thereof, the use of the coating compositions as lacquers and/or adhesives, and objects and substrates provided with these lacquers and/or adhesives.

A renewable chemical composition is disclosed for use in a variety of industrial applications. The renewable chemical composition may be reacted with an isocyanate to produce a urethane material. The renewable chemical composition has aromatic groups. The suitability of this material for use in a variety of applications can be adjusted by modifying the acid number, the hydroxyl number, the viscosity, the glass transition temperature, the % solids, the softening point, and other properties. The chemical reactivity and properties can be modified based on processing conditions and temperature as well as the source of renewable raw material. The lignin used in these formulations may be from pulp and paper processing such as semi-mechanical processing, soda processing, kraft processing, or biomass processing, or a by-product of ethanol production. The novel biobased polyurethane formulations range in firmness from flexible to semi-rigid to rigid and are useful in large volume polyurethane applications.

The disclosure relates to waterborne polyurethane dispersions as well as related coated articles and methods. The dispersion includes a liquid or aqueous water-containing medium and polyurethane particles dispersed therein. The polyurethane particles include a reaction product between an isocyanate, a lignin (or unmodified lignin) having an aliphatic hydroxyl content of at least 2 mmol/g, optionally a natural oil polyol, and optionally an internal emulsifier. The polyurethane dispersion can have a high solids loading and typically includes a large fraction of biobased and/or environmentally friendly components, polyurethane dispersion can be applied as a layer on a substrate, for example as a coating or adhesive.

Curable compositions are provided comprising: a) an isocyanate-functional component and b) an amine-functional component comprising i) a primary amine- and/or a secondary amine-functional compound, and ii) a tertiary amine-functional compound. The tertiary amine-functional compound is present in the amine-functional component b) in an amount of 3.5 to 7 percent by weight, based on the total weight of amine-functional compounds in the amine-functional component b). Also provided are curable compositions comprising the above and c) untreated silica particles. The untreated silica particles are present in the curable composition in an amount of 0.5 to 15 percent by weight, based on the total weight of solids in the curable composition. Additionally provided are coated articles and polyurea articles formed from the curable compositions above.