摘要:
A leather-like sheet is provided having a substrate layer and a surface skin layer in which the surface skin layer is composed of a cross-linked product of a polyurethane hot-melt composition containing 100 parts by mass of a urethane prepolymer, 5 parts by mass to 40 parts by mass of a coloring agent containing a polyol, 5 parts by mass to 50 parts by mass of multi-functional (meth)acrylate, and 0.5 parts by mass to 5 parts by mass of a photopolymerization initiator, wherein the urethane prepolymer can be obtained by reacting 5% to 50% of the number of isocyanate groups in a urethane prepolymer containing isocyanate groups that is obtained by reacting a polyol containing 40% by mass or more of polytetramethylene glycol and a polyisocyanate with a (meth)acrylate containing a hydroxyl group. This leather-like sheet has an excellent surface grade while maintaining excellent suppleness and bending resistance.
摘要:
A leather-like sheet is provided having a substrate layer and a surface skin layer in which the surface skin layer is composed of a cross-linked product of a polyurethane hot-melt composition containing 100 parts by mass of a urethane prepolymer, 5 parts by mass to 40 parts by mass of a coloring agent containing a polyol, 5 parts by mass to 50 parts by mass of multi-functional (meth)acrylate, and 0.5 parts by mass to 5 parts by mass of a photopolymerization initiator, wherein the urethane prepolymer can be obtained by reacting 5% to 50% of the number of isocyanate groups in a urethane prepolymer containing isocyanate groups that is obtained by reacting a polyol containing 40% by mass or more of polytetramethylene glycol and a polyisocyanate with a (meth)acrylate containing a hydroxyl group. This leather-like sheet has an excellent surface grade while maintaining excellent suppleness and bending resistance.
摘要:
There are provided a moisture-curable polyurethane hot melt adhesive containing a urethane prepolymer obtained by reacting a polyol (A) with a polyisocyanate (B), wherein the polyol (A) contains 40 to 80 mass % of a polycarbonate polyol (a1), 5 to 40 mass % of polytetramethylene glycol (a2), and 5 to 40 mass % of a polyester polyol (a3) obtained by reacting a polycarboxylic acid containing an aliphatic polycarboxylic acid and an aromatic polycarboxylic acid with a polyether polyol obtained by adding an alkylene oxide to bisphenol A, based on the total amount of the polyol (A), and a multilayer sheet using this adhesive. This adhesive can maintain excellent adhesion strength even after washing is repeatedly performed under stringent washing conditions without impairing soft texture of a multilayer sheet.
摘要:
There are provided a moisture-curable polyurethane hot melt adhesive containing a urethane prepolymer obtained by reacting a polyol (A) with a polyisocyanate (B), wherein the polyol (A) contains 40 to 80 mass % of a polycarbonate polyol (a1), 5 to 40 mass % of polytetramethylene glycol (a2), and 5 to 40 mass % of a polyester polyol (a3) obtained by reacting a polycarboxylic acid containing an aliphatic polycarboxylic acid and an aromatic polycarboxylic acid with a polyether polyol obtained by adding an alkylene oxide to bisphenol A, based on the total amount of the polyol (A), and a multilayer sheet using this adhesive. This adhesive can maintain excellent adhesion strength even after washing is repeatedly performed under stringent washing conditions without impairing soft texture of a multilayer sheet.
摘要:
A method of producing a polyurethane foam sheet, and a laminated sheet that uses such a foam sheet, that can be applied to artificial leather, synthetic leather, and cushioning materials used in all manner of applications. A polyurethane foam sheet is produced by applying a liquid mixture, obtained by mixing together a heated and melted hot melt urethane prepolymer (A) containing isocyanate groups at molecular terminals, and a compound (B) containing at least 2 active hydrogen atom-containing groups, onto a substrate in a sheet-like manner, and then water foaming the liquid mixture by bringing the sheet-like liquid mixture into contact with water vapor or moisture (water). A laminated sheet is produced by bonding a third substrate to the polyurethane foam sheet.
摘要:
A method of producing a polyurethane foam sheet, and a laminated sheet that uses such a foam sheet, that can be applied to artificial leather, synthetic leather, and cushioning materials used in all manner of applications. A polyurethane foam sheet is produced by applying a liquid mixture, obtained by mixing together a heated and melted hot melt urethane prepolymer (A) containing isocyanate groups at molecular terminals, and a compound (B) containing at least 2 active hydrogen atom-containing groups, onto a substrate in a sheet-like manner, and then water foaming the liquid mixture by bringing the sheet-like liquid mixture into contact with water vapor or moisture (water). A laminated sheet is produced by bonding a third substrate to the polyurethane foam sheet.
摘要:
A process for producing a leather-like sheet, wherein a skin-like layer composed of a resin composition (C) is formed on top of a fibrous substrate (E), comprising; heating and melting a moisture-curable polyurethane hot-melt resin composition (C) which contains a hot-melt urethane prepolymer (A) having isocyanate groups at molecular terminal ends and a colorant (B), and applying said heated and melted resin composition (C) to either [1] a releasable substrate (D) and then bonding the coated surface to a fibrous substrate (E), or [2] a fibrous substrate (E) and then bonding the coated surface to a releasable substrate (D); wherein the colorant (B) contains a polyol with a number average molecular weight within a range from 1,000 to 20,000 as a vehicle (B-1), and a pigment (B-2).
摘要:
A process for producing a leather-like sheet, wherein a skin-like layer composed of a resin composition (C) is formed on top of a fibrous substrate (E), comprising; heating and melting a moisture-curable polyurethane hot-melt resin composition (C) which contains a hot-melt urethane prepolymer (A) having isocyanate groups at molecular terminal ends and a colorant (B), and applying said heated and melted resin composition (C) to either [1] a releasable substrate (D) and then bonding the coated surface to a fibrous substrate (E), or [2] a fibrous substrate (E) and then bonding the coated surface to a releasable substrate (D); wherein the colorant (B) contains a polyol with a number average molecular weight within a range from 1,000 to 20,000 as a vehicle (B-1), and a pigment (B-2).
摘要:
A moisture-curable polyurethane hot-melt adhesive containing a urethane prepolymer obtained by reacting a polyol (A) which comprises a polyester polyol (a-1) obtained by reacting a polyol prepared by the addition of bisphenol A with an alkylene oxide with both an aliphatic polycarboxylic acid and an aromatic polycarboxylic acid, a crystalline polyester polyol (a-2), and a polyoxyethylene glycol (a-3) having a number-average molecular weight of 2000 to 25000 with a polyisocyanate (B); and a moisture-permeable film, which are suitable for the production of sport wear, raincoats, shoes, fireman uniforms, military uniforms, and so on.
摘要:
An object of the present invention is to provide a moisture-permeable film having superior moisture permeability and flexibility at levels enabling the use thereof in the production of textile products such as clothes, while also not being susceptible to the occurrence of decreases in surface quality caused by roughening. The present invention relates to a moisture-permeable film obtained by curing a reactive polyurethane hot melt resin composition comprising a reactive urethane prepolymer (D), a (meth)acrylate (E) and a photopolymerization initiator (F), wherein the reactive urethane prepolymer (D) is obtained by reacting a hydroxyl group-containing (meth)acrylate (C) with 10% to 90% of the equivalent of isocyanate groups possessed by an urethane prepolymer obtained by reacting a polyisocyanate (B) with a polyol (A); and the polyol (A) contains a polyester polyol (a-1) which is obtained by reacting polycarboxylic acid with a polyol in which an alkylene oxide is added to bisphenol A, a poly ester polyol (a-2) which is a solid at normal temperature and a polyethylene glycol (a-3) which has a number average molecular weight of 1000 to 25,000.