Disclosed is a polyurethane resin which is obtained by a reaction between a polyisocyanate component, which contains 1,4-bis(isocyanatomethyl)cyclohexane including not less than 80% by mole of trans isomers, and an active hydrogen compound component.

Provided are one-part, shelf-stable polyurethane aerosol compositions, and related articles and methods. When sprayed onto a substrate and dried, these compositions provide polyurethane films. These polyurethane films display improved moisture resistance, optical clarity, and weatherability compared to known aerosol compositions, particularly in adverse environmental conditions. The compositions generally include an aqueous polyurethane dispersion containing a urethane moiety obtained by reacting (i) a polyol or thiol having isocyanate-reactive functional groups, (ii) a neutralized water-solubilizing compound, and (iii) a diisocyanate and optionally a silane terminal group; a propellant; and optionally one or more additives.

Provided are one-part, shelf-stable polyurethane aerosol compositions, and related articles and methods. When sprayed onto a substrate and dried, these compositions provide polyurethane films. These polyurethane films display improved moisture resistance, optical clarity, and weatherability compared to known aerosol compositions, particularly in adverse environmental conditions. The compositions generally include an aqueous polyurethane dispersion containing a urethane moiety obtained by reacting (i) a polyol or thiol having isocyanate-reactive functional groups, (ii) a neutralized water-solubilizing compound, and (iii) a diisocyanate and optionally a silane terminal group; a propellant; and optionally one or more additives.

Disclosed is a polyurethane resin which is obtained by a reaction between a polyisocyanate component, which contains 1,4-bis(isocyanatomethyl)cyclohexane including not less than 80% by mole of trans isomers, and an active hydrogen compound component.

Disclosed is a polyurethane resin which is obtained by a reaction between a polyisocyanate component, which contains 1,4-bis(isocyanatomethyl)cyclohexane including not less than 80% by mole of trans isomers, and an active hydrogen compound component.

A method of making a silyl-terminated polyurethane in an aqueous dispersion aqueous silyl-terminated polyurethane dispersions are described. In one embodiment, the polyurethane comprises a) urethane moieties derived from the reaction of a (i) a diol; (ii) a neutralized anionic water solubilizing compound; and iii) a diisocyanate. The polyurethane also comprises b) silyl terminal groups derived from an alkoxy silane compound having the formula (R.sup.3O).sub.3SiR.sup.4Z, wherein R.sup.3 is independently hydrogen or a C.sub.1-C.sub.4 alkyl; R.sup.4 is a divalent group selected from alkylene, alkylarylene, oxyalkylene; and Z is selected from the group consisting of OH, SH, NR, NH.sub.2, wherein R is an aromatic or aliphatic cyclic group. The polyurethane also comprises c) urea moieties derived from the reaction of an isocyanate terminated prepolymer and a difunctional hydrazine or hydrazide compound.

A method of making a silyl-terminated polyurethane in an aqueous dispersion aqueous silyl-terminated polyurethane dispersions are described. In one embodiment, the polyurethane comprises a) urethane moieties derived from the reaction of a (i) a diol; (ii) a neutralized anionic water solubilizing compound; and iii) a diisocyanate. The polyurethane also comprises b) silyl terminal groups derived from an alkoxy silane compound having the formula (R.sup.3O).sub.3SiR.sup.4Z, wherein R.sup.3 is independently hydrogen or a C.sub.1-C.sub.4 alkyl; R.sup.4 is a divalent group selected from alkylene, alkylarylene, oxyalkylene; and Z is selected from the group consisting of OH, SH, NR, NH.sub.2, wherein R is an aromatic or aliphatic cyclic group. The polyurethane also comprises c) urea moieties derived from the reaction of an isocyanate terminated prepolymer and a difunctional hydrazine or hydrazide compound.

The present invention relates to a process for the production of aqueous polyurethane-polyurea dispersions comprising the steps of: A) reacting primary and/or secondary monoamines or diamines A1) with cyclic carbonate containing one hydroxy group A2) such that the molar ratio of total primary and/or secondary amine groups to cyclic carbonate groups is in the range of 0.8 to 1.2; B) producing an NCO-containing polyurethane prepolymer by reacting B1) polyisocyanates with B2) polymeric polyols and/or polyamines having number average molecular weights of more than 400 to 8,000 g/mol, optionally B3) low molecular weight compounds having number average molecular weights of 17-400 g/mol selected from the group consisting of mono- and polyalcohols, mono- and polyamines, and aminoalcohols; optionally B4) isocyanate-reactive, ionically hydrophilizing compounds, and B5) the reaction products of A); C) dispersing the prepolymer from B) in water; and D) optionally reacting the remaining free NCO groups of the prepolymer from B) with monoamines, polyamines, hydrazine and/or hydrazides, wherein the molar ratio of the NH groups to the NCO groups is from 0 to 1.2, and step D) occurs partially or completely prior to or during the dispersion step C).

The present invention relates to a process for the production of aqueous polyurethane-polyurea dispersions comprising the steps of: A) reacting primary and/or secondary monoamines or diamines A1) with cyclic carbonate containing one hydroxy group A2) such that the molar ratio of total primary and/or secondary amine groups to cyclic carbonate groups is in the range of 0.8 to 1.2; B) producing an NCO-containing polyurethane prepolymer by reacting B1) polyisocyanates with B2) polymeric polyols and/or polyamines having number average molecular weights of more than 400 to 8,000 g/mol, optionally B3) low molecular weight compounds having number average molecular weights of 17-400 g/mol selected from the group consisting of mono- and polyalcohols, mono- and polyamines, and aminoalcohols; optionally B4) isocyanate-reactive, ionically hydrophilizing compounds, and B5) the reaction products of A); C) dispersing the prepolymer from B) in water; and D) optionally reacting the remaining free NCO groups of the prepolymer from B) with monoamines, polyamines, hydrazine and/or hydrazides, wherein the molar ratio of the NH groups to the NCO groups is from 0 to 1.2, and step D) occurs partially or completely prior to or during the dispersion step C).

A method for forming a multilayer coating film, comprising the following steps (1) to (5): (1) producing a first aqueous base coating composition comprising combining an acrylic resin dispersion (A) having a core/shell structure and a melamine resin (B), (2) applying the first aqueous base coating composition onto a surface of an object to form an uncured first aqueous base coating film, (3) applying a second aqueous base coating composition onto the uncured first aqueous base coating film to form an uncured second aqueous base coating film, (4) applying a clear coating composition onto the uncured second aqueous base coating film to form an uncured clear coating film, and (5) heat-curing the uncured first aqueous base coating film, the uncured second aqueous base coating film, and the uncured clear coating film obtained in steps (2) to (4) at a time to form the multilayer coating film.