In the polyurethane resin of a reaction product of a polyisocyanate component and a polyol component, the polyisocyanate component contains an aliphatic polyisocyanate derivative, the aliphatic polyisocyanate derivative has an isocyanurate group and an allophanate group, and an allophanate group content relative to 100 mol of the isocyanurate group of 10 mol or more and 90 mol or less, the polyol component contains polyoxyalkylene triol and/or polyestertriol with a hydroxyl number of 100 mgKOH/g or more and 600 mgKOH/g or less, and polyoxyalkylene diol and/or polyesterdiol with a hydroxyl number of 100 mgKOH/g or more and 300 mgKOH/g or less.

An object of the present invention is to provide a method for forming a multilayer coating film, the method making it possible to obtain, with excellent curability at low temperatures and in a short period of time, a multilayer coating film exhibiting an excellent finished appearance. The present invention provides a method for forming a multilayer coating film, wherein a substrate is sequentially coated with at least one layer of one or more base coating compositions, and with one or more clear coating compositions, the method being characterized by utilizing a clear coating composition containing a hydroxy-containing acrylic resin (A) having a hydroxy value in a specific range; a polyisocyanate compound (B) having a viscosity in a specific range; and an organometallic catalyst (C) containing a metallic compound (C1) in which the metal is a member selected from the group consisting of zinc, tin, zirconium, bismuth, lead, cobalt, manganese, titanium, aluminum, and molybdenum, and an amidine compound (C2).

An object of the present invention is to provide a method for forming a multilayer coating film, the method making it possible to obtain, with excellent curability at low temperatures and in a short period of time, a multilayer coating film exhibiting an excellent finished appearance. The present invention provides a method for forming a multilayer coating film, wherein a substrate is sequentially coated with at least one layer of one or more base coating compositions, and with one or more clear coating compositions, the method being characterized by utilizing a clear coating composition containing a hydroxy-containing acrylic resin (A) having a hydroxy value in a specific range; a polyisocyanate compound (B) having a viscosity in a specific range; and an organometallic catalyst (C) containing a metallic compound (C1) in which the metal is a member selected from the group consisting of zinc, tin, zirconium, bismuth, lead, cobalt, manganese, titanium, aluminum, and molybdenum, and an amidine compound (C2).

A one-component type curable composition includes: an isocyanate group-containing urethane prepolymer (A) obtained by allowing a polyoxyalkylene-based polyol (a-1) having a number average molecular weight of 1,000 or more and less than 3,000, a polyol (a-2) having a number average molecular weight of less than 1,000, an epoxy (meth)acrylate (a-3) containing two or more hydroxyl groups in one molecule, and isophorone diisocyanate (a-4) to react with each other; a compound (B) having an oxazolidine ring; a first curing accelerator (C) configured to accelerate a reaction between at least one of a secondary amino group or a hydroxyl group generated by hydrolysis of the (B) and an isocyanate group of the (A); and a second curing accelerator (D) configured to accelerate the hydrolysis of the (B).

A one-component type curable composition includes: an isocyanate group-containing urethane prepolymer (A) obtained by allowing a polyoxyalkylene-based polyol (a-1) having a number average molecular weight of 1,000 or more and less than 3,000, a polyol (a-2) having a number average molecular weight of less than 1,000, an epoxy (meth)acrylate (a-3) containing two or more hydroxyl groups in one molecule, and isophorone diisocyanate (a-4) to react with each other; a compound (B) having an oxazolidine ring; a first curing accelerator (C) configured to accelerate a reaction between at least one of a secondary amino group or a hydroxyl group generated by hydrolysis of the (B) and an isocyanate group of the (A); and a second curing accelerator (D) configured to accelerate the hydrolysis of the (B).

A low-resilience polyurethane foam is produced by allowing a low-resilience polyurethane foam composition containing polyisocyanate (a), polyol (b), catalyst (c), and blowing agent (d) to react. The polyisocyanate (a) contains bis(isocyanatomethyl)cyclohexane, and the polyol (b) contains 5 to 30 mass % of polyol (b-1) having an average functionality of 1.5 to 4.5 and a hydroxyl number of 20 to 70 mgKOH/g, and 70 to 95 mass % of polyol (b-2) having an average functionality of 1.5 to 4.5 and a hydroxyl number of 140 to 300 mgKOH/g.

A low-resilience polyurethane foam is produced by allowing a low-resilience polyurethane foam composition containing polyisocyanate (a), polyol (b), catalyst (c), and blowing agent (d) to react. The polyisocyanate (a) contains bis(isocyanatomethyl)cyclohexane, and the polyol (b) contains 5 to 30 mass % of polyol (b-1) having an average functionality of 1.5 to 4.5 and a hydroxyl number of 20 to 70 mgKOH/g, and 70 to 95 mass % of polyol (b-2) having an average functionality of 1.5 to 4.5 and a hydroxyl number of 140 to 300 mgKOH/g.

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.

The invention provides polyurethane and polyisocyanurate foams and methods for the preparation thereof. More particularly, the invention relates to closed-celled, polyurethane and polyisocyanurate foams and methods for their preparation. The foams are characterized by a fine uniform cell structure and little or no foam collapse. The foams are produced with a polyol premix composition which comprises a combination of a hydrohaloolefin blowing agent, a polyol, a silicone surfactant, and a non-amine catalyst used alone or in combination with an amine catalyst.