Patent ID: 9006338
Filing Date: 2015-04-14
Classification: C08G,C08J,C08K,C08L,C09D,Y10T

Abstract:
1. An aqueous resin composition having gas barrier properties, which comprises (i) a polyurethane resin having a urethane group and a urea group in a total concentration of 25 to 60% by weight and having an acid group, (ii) an inorganic compound, and (iii) a polyamine, wherein the polyurethane resin (i) is an aqueous polyurethane resin which comprises a residue of a polyisocyanate compound (A), a residue of a polyhydroxyalkanecarboxylic acid (B), and optionally a polyol compound (C), wherein when the polyol compound (C) is included, each of the residues (B) and (C) are bonded to the residue of the polyisocyanate compound (A) through a urethane group for forming a prepolymer having an isocyanate group and a carboxyl group, and a residue of a chain-extension agent (D) which bonds to the prepolymer through at least a urea group to form a polyurethane having the carboxyl group, and the carboxylic group of the polyurethane is neutralized with a neutralizing agent, and the chain-extension agent (D) is at least one member selected from the group consisting of a diamine, hydrazine and a hydrazine derivative; the proportion of the total amount of components (B), (C) and (D) each having an active hydrogen atom is, as the total amount of the active hydrogen atom, about 0.8 to 1.2 mol relative to 1 mol of the isocyanate group of the polyisocyanate compound (A); and the polyisocyanate compound (A) contains at least one member selected from the group consisting of a xylylene diisocyanate and a hydrogenated xylylene diisocyanate; the inorganic compound (ii) consists essentially of at least one swelling inorganic layered compound selected from the group consisting of a smectite group clay mineral and a mica group clay mineral; the polyamine (iii) comprises urethane-modified polyamine; the polyamine (iii) is a component added to a dispersion of the at least one swelling inorganic layered compound (ii), an aqueous solution or dispersion of the polyurethane resin (i), or a dispersion containing an aqueous solution or dispersion of the polyurethane resin (i) and the at least one swelling inorganic layered compound (ii); and the proportion of the acid group of the polyurethane resin (i) relative to the basic nitrogen atom of the polyamine (iii) is 3/1 to 1/2 as the equivalent ratio.