Abstract: Provided are a resin composition for 3D printer which is low in viscosity, is good in handleability by 3D printers and can give shaped products excellent in flexibility in a broad temperature range, and a method for producing the same, and a cured product of the resin composition. The resin composition for 3D printer of the present invention contains a first monomer, a second monomer, and a photopolymerization initiator, wherein the first monomer is a reaction product of a particular polyether polyol, a polyisocyanate and a particular compound having a (meth)acryloyl group; the total number of moles of the hydroxyl group of the polyether polyol and a group reactive with isocyanate group of the compound having a (meth)acryloyl group is equal to the number of moles of the isocyanate group of the polyisocyanate; and the second monomer is a (meth)acrylic compound.

Abstract: An aqueous dispersion including a hydroxyl-terminated urethane prepolymer obtained by reacting an oxyalkylene polymer A in which an average number of hydroxyl groups per molecule is more than 2.0 and 3.0 or less, an oxyalkylene polymer B in which an average number of hydroxyl groups per molecule is 1.2 or more and 2.0 or less, and a diisocyanate compound, where a content proportion of oxyethylene groups to a total amount of oxyalkylene groups in the oxyalkylene polymer A is 15% by mass or more, a content proportion of oxyethylene groups to a total amount of oxyalkylene groups in the oxyalkylene polymer B is 15% by mass or more, and a content proportion of oxyethylene groups to a total amount of oxyalkylene groups in the hydroxyl-terminated urethane prepolymer is more than 20% by mass and 70% by mass or less.

Abstract: Provided are a resin composition with low viscosity and a resin cured product. The resin composition comprises a first monomer and a second monomer, wherein the proportion of the first monomer with respect to the total mass of the first monomer and the second monomer is 50 to 98% by mass, and the resin cured product is of the resin composition.

Abstract: To provide a polyurethane prepolymer whereby a pressure-sensitive adhesive having excellent moisture permeability and also having both low adhesion to skin and high adhesion to a substrate can be obtained, a pressure-sensitive adhesive, an adhesive skin patch, a pressure-sensitive adhesive tape, a wearable device and a wearable device kit. A hydroxy group-terminated polyurethane prepolymer which is obtained by reacting an oxyalkylene polymer A having an average number of hydroxy groups per molecule of from 2.1 to 3, an oxyalkylene polymer B having one hydroxy group per molecule, and a diisocyanate compound, wherein the number average molecular weight of the oxyalkylene polymer B is at least 5,000, and the content of ethylene oxide units in the hydroxy group-terminated polyurethane prepolymer is more than 10 mass %, a pressure-sensitive adhesive, an adhesive skin patch, a pressure-sensitive adhesive tape, a wearable device and a wearable device kit.

Abstract: To suppress deterioration of mechanical properties of a foam, by using a polyol system solution stored. A polyol system solution is prepared by using a polyether polyol (A1) having a hydroxy value of from 5 to 45 mgKOH/g and an average number of hydroxy groups of from 2 to 8, obtainable by subjecting an alkylene oxide to ring-opening addition polymerization to an initiator, in the presence of a double metal cyanide complex catalyst, to obtain an intermediate polyol; and subjecting ethylene oxide to a ring-opening addition polymerization in an amount of from 1 to 23 mol per 1 mol of the initiator to the intermediate polyol, in the presence of an alkali metal hydroxide as a polymerization catalyst, and a flexible polyurethane foam is produced by using the polyol system solution.

Abstract: To provide a method for producing a polyether having a weight average molecular weight of from 15,000 to 550,000. The method for producing a polyether having a weight average molecular weight of from 15,000 to 550,000, comprises subjecting a cyclic monomer to a ring-opening addition reaction to an initiator having at least one active hydrogen atom per molecule in the presence of a double metal cyanide complex catalyst and an organic solvent, wherein the relative permittivity of the organic solvent is at most 18, and the amount of the organic solvent is from 6 to 300 parts by mass per 100 parts by mass in total of the initiator and the cyclic monomer.

Abstract: A polyether preparation method which comprises a polymerization step of subjecting a monoepoxide having at least 2 carbon atoms to ring-opening addition polymerization to an initiator having at least one active hydrogen-containing functional group in the presence of a catalyst in a stirring vessel, to obtain a polyether, wherein the stirring vessel is one wherein a stirring shaft rotatable by an external drive source is provided at the center of the stirring vessel; plate-shaped bottom paddles extending in a radial direction of the stirring vessel are mounted on a lower portion of the stirring shaft; lattice vanes each comprising arm paddles extending in a radial direction and strips extending in an axial direction, are mounted on a portion of the stirring shaft above the bottom paddles; and a discharge nozzle as a monoepoxide-supply means for discharging the monoepoxide to at least two locations below the lower ends of the strips.

Abstract: To provide a process for producing a flexible polyurethane foam having a higher biomass degree than a conventional flexible polyurethane foam and excellent in foam physical properties and its appearance. A polymer-dispersed polyol obtained by polymerizing a vinyl monomer in the presence of the following polyol (a1) derived from a natural fat/oil and/or the following polyoxyalkylene polyol (a2) is used: Polyol (a1) derived from a natural fat/oil: a polyol derived from a natural fat/oil, which is obtained by providing a natural fat/oil with hydroxy groups by chemical reaction, and which has a hydroxy value of from 20 to 250 mgKOH/g and a molecular weight distribution of at least 1.

Abstract: To provide a process for producing a flexible polyurethane foam having a higher biomass degree than a conventional flexible polyurethane foam and excellent in foam physical properties and its appearance. A polymer-dispersed polyol obtained by polymerizing a vinyl monomer in the presence of the following polyol (a1) derived from a natural fat/oil and/or the following polyoxyalkylene polyol (a2) is used: Polyol (a1) derived from a natural fat/oil: a polyol derived from a natural fat/oil, which is obtained by providing a natural fat/oil with hydroxy groups by chemical reaction, and which has a hydroxy value of from 20 to 250 mgKOH/g and a molecular weight distribution of at least 1.

Abstract: To suppress deterioration of mechanical properties of a foam, by using a polyol system solution stored. A polyol system solution is prepared by using a polyether polyol (A1) having a hydroxy value of from 5 to 45 mgKOH/g and an average number of hydroxy groups of from 2 to 8, obtainable by subjecting an alkylene oxide to ring-opening addition polymerization to an initiator, in the presence of a double metal cyanide complex catalyst, to obtain an intermediate polyol; and subjecting ethylene oxide to a ring-opening addition polymerization in an amount of from 1 to 23 mol per 1 mol of the initiator to the intermediate polyol, in the presence of an alkali metal hydroxide as a polymerization catalyst, and a flexible polyurethane foam is produced by using the polyol system solution.

Abstract: If it is attempted to produce a polymer polyol at a high concentration, there will be a problem such that during polymerization of a monomer to form fine polymer particles, particles are likely to aggregate one another to form aggregates, and storage stability of the polymer polyol tends to deteriorate. A method for producing a polymer polyol is presented which comprises polymerizing at least one type of ethylenically unsaturated monomer together with a seed particle dispersion, in a polyol, wherein the seed particle dispersion is one obtained by polymerizing an ethylenically unsaturated monomer in the presence of an ethylenically unsaturated macromonomer, a solvent and a chain transfer agent, and the ethylenically unsaturated macromonomer is a reaction product of a specific polyol, an isocyanate compound and an ethylenically unsaturated monomer having a hydroxy group.

Abstract: A polyether polyol composition comprising: a polyether polyol, a phosphoric acid compound selected from the group consisting of at least one of orthophosphoric acid, polyphosphoric acid, polymetaphosphoric acid, and partial esters thereof in an amount raning from 0.5 to 100 ppm based on the polyether polyol metals derived from a composite metal cyanide complex catalyst in an amount ranging from 1 to 30 ppm based on the polyether polyol; a method for producing this polyether polyol composition; and methods of making polyurethane or isocyanate group-terminated prepolymers.

Abstract: A process for producing a polyether having at least one hydroxy group by subjecting a cyclic monomer to ring-opening addition polymerization to an initiator having a hydroxy group in the presence of a double metal cyanide complex catalyst, comprising the following steps: initial step: supplying the cyclic monomer in an amount of 5 to 20 mass percent of the initiator to a reaction system containing the initiator and the catalyst, to carry out reaction, wherein the reaction system temperature when supply of the cyclic monomer is started is from 120 to 165° C., and the maximum temperature of the reaction system after supply of the cyclic monomer is higher by from 15 to 50° C. than the temperature when supply of the cyclic monomer is started; and polymerization step: supplying the cyclic monomer to the reaction system after the initial step to carry out ring-opening addition polymerization.

Abstract: The present invention relates to a method for manufacturing an isocyanate group-terminated prepolymer, comprising the following steps (a) to (d): (a) a step of ring-opening polymerizing an alkyleneoxide-containing cyclic compound by using an initiator in the presence of a composite metal cyanide complex catalyst, thereby obtaining a polyol composition containing the catalyst; (b) a step of, without removal of the composite metal cyanide complex catalyst from the polyol composition obtained in the step (a), adding water and performing a heat treatment in a closed system; (c) a step of subjecting the hydrous polyol composition after the step (b) to a dehydration treatment; and (d) a step of adding a polyisocyanate compound to the polyol composition after the step (c) and subjecting to a reaction with the polyol in the polyol composition.

Abstract: A polyether is synthesized by ring opening polymerization of an alkylene oxide with an initiator having at least one hydroxyl group, in the presence of a double metal cyanide complex catalyst, then a powder of an inorganic adsorbent containing at least 50 vol % of fine particles having a particle size of at most 26 ?m and further containing at least 90 vol % of fine particles having a particle size of at most 44 ?m, is added to the crude polyether, and a metal derived from the above double metal cyanide complex catalyst is adsorbed on the powder, followed by separating the powder from the crude polyether.

Abstract: A process for producing a flexible polyurethane foam excellent in mechanical strength, and exhibiting reduced shrinkage. The foam is produced using a polyol (A) containing from 40 to 100 mass % of a polyoxyalkylene polyol (A1). The polyoxyalkylene polyol (A1) is produced through an initial step of adding, to a reaction liquid containing an initiator and a double metal cyanide complex catalyst, 5 to 20 mass % of an alkylene oxide, based on the content of the initiator. After the initial step, an alkylene oxide is newly supplied to carry out polymerization. In the initial step, the temperature of the reaction system when addition of the alkylene oxide is started is from 120 to 165° C., and the maximum temperature of the reaction system after the alkylene oxide has been added in the initial step is higher by 15 to 50° C. than the temperature when addition of the alkylene oxide was started.

Abstract: In producing a polyether in the presence of a double metal cyanide complex catalyst, a narrow molecular weight distribution of the polyether can be obtained. Producing a polyether with at least one hydroxy group includes subjecting a cyclic monomer, such as an alkylene oxide, to a ring-opening addition polymerization with an initiator having a hydroxy group, in the presence of a double metal cyanide complex catalyst.

Abstract: The present invention relates to a method for manufacturing an isocyanate group-terminated prepolymer, comprising the following steps (a) to (d): (a) a step of ring-opening polymerizing an alkyleneoxide-containing cyclic compound by using an initiator in the presence of a composite metal cyanide complex catalyst, thereby obtaining a polyol composition containing the catalyst; (b) a step of, without removal of the composite metal cyanide complex catalyst from the polyol composition obtained in the step (a), adding water and performing a heat treatment in a closed system; (c) a step of subjecting the hydrous polyol composition after the step (b) to a dehydration treatment; and (d) a step of adding a polyisocyanate compound to the polyol composition after the step (c) and subjecting to a reaction with the polyol in the polyol composition.

Abstract: To provide a polymer-dispersed polyol made by using materials derived from a natural fat/oil, which has a low viscosity, without lowering the biomass degree and without impairing the performance of a flexible polyurethane foam to be obtained. Further, to provide a process for producing a flexible polyurethane foam using the polymer-dispersed polyol. A polymer-dispersed polyol, comprising polymer particles dispersed in a matrix containing a polyol (a1) derived from a natural fat/oil and an epoxidized natural fat/oil (x). And, a process for producing a flexible polyurethane foam, which comprises reacting a polyol containing the above polymer-dispersed polyol and a polyisocyanate compound in the presence of a catalyst and a blowing agent.

Abstract: To provide a process for producing a polyether, which comprises subjecting an alkylene oxide and the like to ring-opening addition polymerization to an initiator in the presence of a double metal cyanide complex catalyst (DMC catalyst), which can be carried out by use of a DMC catalyst at a low concentration, and accordingly the amount of the DMC catalyst remaining in a polyether to be obtained can be reduced. A process for producing a polyether, which comprises subjecting an alkylene oxide and an oxygen-containing heterocyclic compound other than an alkylene oxide, to ring-opening addition polymerization to an initiator having a hydroxy group in the presence of a DMC catalyst, wherein prior to the ring-opening addition polymerization, the DMC catalyst and the initiator are subjected to mixing treatment at a temperature of from 125° C. to 180° C. under an absolute pressure of at most 0.06 MPa for from 10 minutes to 24 hours.