Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a low density polyurethane foam of 20 kg/m3 or lower density, having good adhesion with an adherend without shrinking of the foam or formation of voids inside for a formulation using abundant water as a foaming agent, capable of producing the polyurethane foam in good conditions of working environment reducing bad smell due to a catalyst for producing polyurethane. SOLUTION: This method for producing a polyurethane foam having 20 kg/m3 or lower density comprises reacting a polyol component with an isocyanate component in the presence of a catalyst for producing polyurethane, a foaming agent and a foam stabilizer, wherein the catalyst comprises a tertiary amine expressed by the formula (I) (where n is an integer of 2 to 4) and an imidazole compound expressed by the formula (II) (where R1 represents a C1-6 linear or branched alkyl group or a C1-6 linear or branched hydroxyalkyl group; and R2 represents a hydrogen atom, a C1-6 linear or branched alkyl group or a C1-6 linear or branched hydroxyalkyl group).
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing an odorless polyurethane foam which keeps the inherent properties of an N-substituted imidazole and is reduced in an offensive odor based on the N-substituted imidabzoles, allowing a good producing environment. SOLUTION: The method for producing an odorless polyurethane foam comprises a reaction of the polyol component with the isocyanate component in the presence of a low-odored catalyst and a foaming agent, wherein said catalyst comprises an imidazole compound represented by the formula (I) (Wherein R1 is a 1-4C alkyl group, R2 is hydrogen or methyl, and n is 1 or 2).
Abstract:
PROBLEM TO BE SOLVED: To produce a catalyst for producing a polyurethane of a low odor, and to provide a process for producing a polyurethane excellent in vinyl stain resistance, fogging resistance and heat resistance by using the catalyst for producing the polyurethane. SOLUTION: There are provided a catalyst for producing a polyurethane comprising a dialkylaminoalkyl alcohol represented by formula (I): R1R2N-(CH2)n- OH (I) (wherein R1 and R2 are each independently a 1-4C alkyl group; and (n) is an integer of 9-12), and a process for producing a polyurethane comprising reacting a polyol component with an isocyanate component in the presence of the catalyst for producing a polyurethane.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing the subject thermal insulation material, favorable in foam fluidity during molding process, excellent in demoldability after the molding process, and capable of giving the polyurethane foam with high compressive strength and thermal conductivity retention. SOLUTION: This method for producing the objective polyurethane foam as thermal insulation material comprises reaction between a polyol component and an isocyanate component in the presence of (A) a catalyst comprising a quaternary ammonium salt and at least one compound selected from N,N,N',N'- tetramethyl-1,6-hexanediamine, N,N-dimethylcyclohexylamine and N-(2- dimethylaminoethyl)-N'-methylpiperazine, (B) a foaming agent composed of water and cyclopentane and (C) a foam stabilizer.
Abstract:
PURPOSE:To provide a recording medium having high durability by interposing a required gas barrier film between a carbon substrate and a recording layer. CONSTITUTION:A recording medium is composed of a carbon substrate made of vitreous carbon and a recording layer, and a gas barrier film of SiO2, SiO, Si3N4, ZrO2, ITO, Ta2O5, a composite material of them, etc., is interposed between the carbon substrate and the recording layer. Even when the carbon substrate is set in an atmosphere at a high temp. in order to form a magnetic film on the substrate, gaseous impurities generated from the carbon substrate owing to unsatisfactory carbonization do not diffuse into the magnetic film by the presence of the gas barrier film and the objective recording medium having high durability is obtd.
Abstract:
PURPOSE:To achieve higher quality by building an electroconductive layer based on a pi conjugate structure on the surface of an organic protective film. CONSTITUTION:An ultraviolet hardening type hard coating agent is applied on a polycarbonate substrate 2 at a thickness of 1-20 mum by a spin coat method and hardened by irradiation with ultraviolet rays to form an organic protective film 3. The substrate 2 is allowed to stand in a pyrole monomer vapor for two hours. Thereafter, it is immersed into a 10% ferrous methanol chloride solution and washed by water sufficiently after one hour to make a electroconductive layer 4 based on a pi conjugate structure. This makes the product hard to damage and achieves higher quality with limited adhesion of dirt and dust and limited generation of errors.
Abstract:
PURPOSE:To improve the stability of a base current in a carbon electrode and thereby to improve the precision in analysis and reproducibility, by a method wherein the density and the size of an opening existing in a working electrode are set at specified values. CONSTITUTION:A sample liquid to be quantified is supplied from a high-speed liquid chromatography 1 into an introduction port 2, made to contact with a working electrode 4 covered with a Teflon seal 3, made further to contact with a reference electrode 5 and then discharged from a discharge port 7 to which an auxiliary electrode 6 is fitted. Between the working electrode 4 and the reference electrode 5 a voltage is impressed from a power source 8. A current value of the working electrode 4 is relation to the eluation volume of the sample liquid passing from the introduction port 2 to the discharge port 7 is measured for analysis by a current measuring device 9. Besides, the working electroe 4 has openings whose density is 2X10 /mm bellow and whose maximum diameter is 0.5mum or below, and it is formed of an isotropic carbon material. By using a surface-polished vitreous carbon material as this carbon material, S/N can be improved and thus a stable analysis can be attained.
Abstract:
PROBLEM TO BE SOLVED: To provide a polyol mixture capable, even in a case where a hydrocarbon foaming agent is used on an occasion for manufacturing a rigid polyurethane foam obtained by using an aromatic polyester polyol as a polyol component, of preserving a homogeneous state of the polyol mixture.SOLUTION: The provided polyol mixture is a polyol mixture for manufacturing a rigid polyurethane foam including (A) polyols including an aromatic polyester polyol having a hydroxyl value of 100 mgKOH/g or above and 500 mgKOH/g or below, (B) a hydrocarbon foaming agent, (C) a catalyst, (D) a foam stabilizer, and (E) a polyoxyethylene adduct of castor oil and/or polyoxyethylene adduct of cured castor oil.
Abstract:
PROBLEM TO BE SOLVED: To provide a manufacturing method for rapidly producing a molded polyurethane article under a high reactivity by a reaction injection molding method and in the method described above even in the case that the molded polyurethane article is made to be a low density by foaming, and the molded polyurethane article in which the surface property is good and lowering of hardness is suppressed, further under suppressing the lowering of hardness, weatherability is superior, can be rapidly produced. SOLUTION: Provided is a method for producing a molded polyurethane article by the reaction injection molding, wherein a polyol-containing component containing a polyether type polyol with a hydroxyl value of 15-60 mgKOH/g and a number of a functional group of 2 to 4, and a chain extender having a molecular weight of 60-200 and a number of functional groups of 2 to 4, and a polyisocyanate component containing an aromatic polyisocyanate and its modified material are reacted, under the condition where a catalyst is present and water is not substantially contained, for 10 sec or less, to form a solid phase. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a foamed polyurethane by which the foamed polyurethane having good surface nature, and highly maintained hardness, breaking strength and breaking elongation even after being formed into a low density product by foaming can be produced in high reactivity without using a lead salt of an organic acid of an environmental loading material by a reaction injection molding method. SOLUTION: The method for producing the foamed polyurethane by the reaction injection molding method using a polyol-containing component, a polyisocyanate component, a catalyst and a foaming agent is characterized by the following items. The polyol-containing component has 15-60 mg KOH/g hydroxy value, and contains a polyether-based polyol having two to four functional groups, and a chain extender having 60-200 molecular weight and two to four functional groups. The polyisocyanate component contains an aliphatic and/or alicyclic polyisocyanate and an isocyanate-modified product of the polyisocyanate, and the NCO content thereof is 22-32 wt.%. The catalyst contains a bismuth salt of an organic acid, and the foaming agent is a supercritical gas. COPYRIGHT: (C)2008,JPO&INPIT