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.

This disclosure is directed to a self-crosslinkable polymer and and an aqueous dispersion comprising particles of the polymer. The self-crosslinkable polymer has a molecular skeleton containing urethane linkages, and a hydrazide functional group and a carbonyl functional group capable of reacting with the hydrazide functional group chemically bonded to the molecular skeleton.

This disclosure is directed to a self-crosslinkable polymer and and an aqueous dispersion comprising particles of the polymer. The self-crosslinkable polymer has a molecular skeleton containing urethane linkages, and a hydrazide functional group and a carbonyl functional group capable of reacting with the hydrazide functional group chemically bonded to the molecular skeleton.

A method of producing PUD by a solvent free process includes drying polyol in vacuum; placing the dried polyol and DMBA in a reaction vessel to mix until a first mixture becomes transparent; adding diisocyanate which having functional group of isocyanate(NCO) to the first mixture to react until NCO terminated first prepolymer is formed; decreasing temperature of the NCO terminated first prepolymer to 65 C.; adding a neutralizing agent to the NCO terminated first prepolymer until NCO terminated second prepolymer is formed; adding the remaining diisocyanate having isocyanate functional group to the NCO terminated second prepolymer to form a second mixture; adding deionized water to the second mixture to form prepolymer dispersion; and adding chain extension agent to the prepolymer dispersion to rotate at a range of 200 to 2,000 rpm for chain extension for 1-3 hours until solid content 40.0 wt. % solvent free PUD is produced.

A method of producing PUD by a solvent free process includes drying polyol in vacuum; placing the dried polyol and DMBA in a reaction vessel to mix until a first mixture becomes transparent; adding diisocyanate which having functional group of isocyanate(NCO) to the first mixture to react until NCO terminated first prepolymer is formed; decreasing temperature of the NCO terminated first prepolymer to 65 C.; adding a neutralizing agent to the NCO terminated first prepolymer until NCO terminated second prepolymer is formed; adding the remaining diisocyanate having isocyanate functional group to the NCO terminated second prepolymer to form a second mixture; adding deionized water to the second mixture to form prepolymer dispersion; and adding chain extension agent to the prepolymer dispersion to rotate at a range of 200 to 2,000 rpm for chain extension for 1-3 hours until solid content 40.0 wt. % solvent free PUD is produced.

A method of producing PUD by a solvent free process includes drying polyol in vacuum; placing the dried polyol and DMBA in a reaction vessel to mix until a first mixture becomes transparent; adding diisocyanate which having functional group of isocyanate (NCO) to the first mixture to react until NCO terminated first prepolymer is formed; decreasing temperature of the NCO terminated first prepolymer to 65 C.; adding a neutralizing agent to the NCO terminated first prepolymer until NCO terminated second prepolymer is formed; adding the remaining diisocyanate having isocyanate functional group to the NCO terminated second prepolymer to form a second mixture; adding deionized water to the second mixture to form prepolymer dispersion; and adding chain extension agent to the prepolymer dispersion to rotate at a range of 200 to 2,000 rpm for chain extension for 1-3 hours until solid content 40.0 wt. % solvent free PUD is produced.

A method of producing PUD by a solvent free process includes drying polyol in vacuum; placing the dried polyol and DMBA in a reaction vessel to mix until a first mixture becomes transparent; adding diisocyanate which having functional group of isocyanate (NCO) to the first mixture to react until NCO terminated first prepolymer is formed; decreasing temperature of the NCO terminated first prepolymer to 65 C.; adding a neutralizing agent to the NCO terminated first prepolymer until NCO terminated second prepolymer is formed; adding the remaining diisocyanate having isocyanate functional group to the NCO terminated second prepolymer to form a second mixture; adding deionized water to the second mixture to form prepolymer dispersion; and adding chain extension agent to the prepolymer dispersion to rotate at a range of 200 to 2,000 rpm for chain extension for 1-3 hours until solid content 40.0 wt. % solvent free PUD is produced.

Provided is a semicarbazide composition comprising: a semicarbazide compound (A) having an amino group and a semicarbazide group; a semicarbazide compound (B-1) having a structure with a semicarbazide group substituted for the amino group of the semicarbazide compound (A); a semicarbazide compound (B-2) as a dimer of the semicarbazide compound (B-1); and a semicarbazide compound (B-3) as a trimer of the semicarbazide compound (B-1); the semicarbazide composition having an analysis area ratio (a) of 0.008% or more and 2% or less.

The present invention provides an aqueous urethane resin composition containing (A) a urethane resin, (B) an organic solvent having a boiling point of 150 to 350 C., and (C) an aqueous medium, the aqueous urethane resin composition being characterized in that the organic solvent (B) has a Hansen solubility parameter in which a dispersion member (d) is 15.5 MPa.sup.0.5 or more and less than 20 MPa.sup.0.5, a polar member (p) is 4.5 MPa.sup.0.5 or more and less than 12 MPa.sup.0.5, and a hydrogen-bonding member (h) is 3 MPa.sup.0.5 or more and less than 10.5 MPa.sup.0.5. The aqueous urethane resin composition has excellent film formability, corrosion resistance, chemical resistance, and substrate adhesiveness, and is capable of forming a low-toxic coating film.