Abstract: Provided is a carbodiimide-based, waterborne resin crosslinking agent that can improve the storage stability of a waterborne resin composition including a waterborne resin together with the crosslinking agent and further also improve the water resistance and the solvent resistance of a cured product of the waterborne resin. A waterborne resin crosslinking agent-containing liquid and a waterborne resin composition are prepared using a waterborne resin crosslinking agent comprising a hydrophobic polycarbodiimide compound and a water-soluble organic compound as blending components, wherein the water-soluble organic compound is one or more selected from the group consisting of an alkylene glycol-based compound, a water-soluble polymer other than the alkylene glycol-based compound, and a surfactant other than the alkylene glycol-based compound or the water-soluble polymer.

Abstract: A fuel cell separator obtained by molding a composition containing graphite powder and an epoxy resin component containing a main agent, a curing agent, and a curing accelerator, in which the average particle diameter d50 of the graphite powder is 20 to 80 ?m, and the average height of the graphite powder measured using a laser microscope is 30 to 70% of the average particle diameter d50, has good bending strength and bending fatigue characteristics even in an environment of 70° C.

Abstract: A method for producing a carbodiimide compound, comprising a carbodiimide production step of reacting an aliphatic tertiary isocyanate compound (A) in the presence of an inorganic alkali metal compound (B) and at least one of a phase transfer catalyst (C), a compound (D-1) represented by general formula (2-1), and a compound (D-2) represented by general formula (2-2).

Abstract: A method for producing a carbodiimide compound, comprising a carbodiimide production step of reacting an aliphatic tertiary isocyanate compound (A) in the presence of an organic alkali metal compound (B) having Lewis basicity.

Abstract: This carbodiimide composition is characterized by comprising a carbodiimide compound (A), a phosphite-based antioxidant (B), and a hindered phenol-based antioxidant (C), and is characterized in that the phosphite-based antioxidant (B) is contained in an amount of 1.5-5 parts by mass with respect to 100 parts by mass of the carbodiimide compound (A), and the hindered phenol-based antioxidant (C) is contained in an amount of 1.5-6 parts by mass with respect to 100 parts by mass of the carbodiimide compound (A). The carbodiimide composition can suppress foaming in a resin during molding, and provides a resin molded article having excellent hydrolysis resistance.

Abstract: This precursor sheet for a fuel cell separator comprises a conductive substrate sheet, a dense layer including first graphite particles, and a conduction layer including second graphite particles, wherein the dense layer and the conduction layer include a resin, the first graphite particles have a volume resistivity of 20 m?·cm or greater and a bulk density of 1.7 g/cm3 or greater when compressed at 30 MPa, and the second graphite particles have a volume resistivity of less than 20 m?·cm and a bulk density of 1.5 g/cm3 or greater when compressed at 30 MPa. This precursor sheet for a fuel cell separator provides a fuel cell separator that has excellent shapability and good mechanical strength, conductivity, and gas impermeability.

Abstract: Provided is a member for exposure device, including glass-like carbon. Also, provided is a method for producing the member for exposure device, the method comprising: the step of forming a thermosetting resin material to prepare a resin formed body, and the step of carbonizing the resin formed body to obtain a glass-like carbon body. Also provided is a composite member for exposure device, including the member for exposure device.

Abstract: The present invention provides a method for producing an aqueous carbodiimide having excellent crosslinking reactivity with a crosslinking group, such as an alcoholic hydroxy group of an aqueous resin.

Abstract: This precursor sheet for a fuel cell separator comprises a conductive substrate sheet, a dense layer including first graphite particles, and a conduction layer including second graphite particles, wherein the dense layer and the conduction layer include a resin, the first graphite particles have a volume resistivity of 20 m?·cm or greater and a bulk density of 1.7 g/cm3 or greater when compressed at 30 MPa, and the second graphite particles have a volume resistivity of less than 20 m?·cm and a bulk density of 1.5 g/cm3 or greater when compressed at 30 MPa. This precursor sheet for a fuel cell separator provides a fuel cell separator that has excellent shapability and good mechanical strength, conductivity, and gas impermeability.

Abstract: Provided is a polyester resin composition that exhibits excellent hydrolysis resistance and generates little isocyanate gas when heated during melt kneading and molding. The polyester resin composition contains a polyester resin (A) and a carbodiimide compound (B) having a specific structure. The content of the carbodiimide compound (B) is 0.1 to 5 parts by mass relative to a total of 100 parts by mass of the polyester resin (A) and the carbodiimide compound (B).

Abstract: Provided is a waterborne resin crosslinking agent and the like capable of obtaining a waterborne resin crosslinking agent-containing liquid excellent in storage stability and the like as well as a cured film (waterborne resin coating film) with sufficiently high gloss (relative-specular glossiness).

Abstract: Provided is a waterborne resin crosslinking agent and the like capable of inhibiting lowering of gloss (relative specular glossiness) of cured films (waterborne resin coating films) after heating.

Abstract: A waterborne resin crosslinking agent is provided, wherein the waterborne resin crosslinking agent of the present invention includes a polycarbodiimide compound (A) and a polycarbodiimide compound (B); the polycarbodiimide compound (A) has a structure in which the isocyanate groups at both terminals are each capped with a predetermined hydrophilic organic compound; the polycarbodiimide compound (B) has a chain diisocyanate compound as a structural unit, and has a structure in which the isocyanate groups at both terminals are each capped with a predetermined organic compound, and the polycarbodiimide compound (A) is in an amount of 5 to 90 parts by mass per 100 parts by mass in total of the polycarbodiimide compounds (A) and (B).

Abstract: Provided is a waterborne resin crosslinking agent, as well as a waterborne resin crosslinking agent-containing liquid and a waterborne resin composition, including the waterborne resin crosslinking agent. The waterborne resin crosslinking agent of the present invention includes a polycarbodiimide compound (A) and a polycarbodiimide compound (B); the polycarbodiimide compound (A) has a structure in which the isocyanate groups at both terminals are each capped with a predetermined hydrophilic organic compound; the polycarbodiimide compound (B) has, as a structural unit, a diisocyanate compound having one cyclohexyl ring or one benzene ring, and has a structure in which the isocyanate groups at both terminals are each capped with a predetermined organic compound, and the polycarbodiimide compound (A) is in an amount of 5 to 90 parts by mass per 100 parts by mass in total of the polycarbodiimide compounds (A) and (B).

Abstract: The present invention provides a novel metal alkoxide having excellent hydrolysis resistance, and a crosslinking agent composition for aqueous resin and an aqueous resin composition each using the same. A metal alkoxide represented by the following formula (1-1), (1-2), or (1-3) and having a mass average molecular weight of 800 to 8,500 is used: Ti(OA)4??(1-1) Zr(OA)4??(1-2) Al(OA)3??(1-3) wherein A's are each independently a residue resulting from removal of a hydroxy group from a polyalkylene glycol monohydrocarbyl ether represented by the following general formula (1a): R11(OCHR12CH2)nOH??(1a) wherein R11 is an alkyl group having 1 to 4 carbon atoms or a phenyl group; R12 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms; and n is an integer of 4 to 45.

Abstract: A method for producing a carbodiimide compound, comprising a carbodiimide production step of reacting an aliphatic tertiary isocyanate compound (A) in the presence of an organic alkali metal compound (B) having Lewis basicity.

Abstract: There are provided a carbodiimide compound excellent in storage stability, and performance as a crosslinking agent, and a method for producing the same, and a resin composition excellent in the film forming properties and solvent resistance of a coating made at low temperature. A polycarbodiimide compound derived from an aliphatic diisocyanate compound having at least one primary isocyanate group, the polycarbodiimide compound having a structure in which all ends are capped with an organic compound having a functional group that reacts with an isocyanate group, carbodiimide group concentration A (%) and weight average molecular weight Mw satisfying the following formula (1), and a resin composition comprising the carbodiimide compound and an aqueous resin having a predetermined acid value at a predetermined ratio. (A/Mw)×1000?0.55??(1).

Abstract: A crosslinking agent composition for water-compatible resins which comprises a hydrophobic crosslinking agent, a water-soluble organic compound, one or more oily media selected from among hydrocarbon-based solvents and ketone-based solvents having a solubility parameter of 9.0 (cal/cm?3)1/2 or less, and an aqueous medium. The crosslinking agent composition can improve the storage stability of a water-compatible resin composition. The water-compatible resin composition which contains this crosslinking agent composition can give cured objects satisfactory in terms of water resistance and solvent resistance and is suitable also for use in wet-on-wet coating.

Abstract: There is provided a compatibilizer for polyester resin which can produce better compatibility than conventional counterparts, and a polyester resin composition using the compatibilizer. The compatibilizer comprises a polycarbodiimide compound represented by the formula (1) describe below wherein the carbodiimide equivalent of the polycarbodiimide compound is 280 or higher; and in the formula (1), R1 and R2 are residues formed by eliminating a functional group from an organic compound having the one functional group reactive with an isocyanate group; R3 is a divalent residue formed by eliminating two isocyanate groups from a diisocyanate compound; R4 is a divalent residue formed by eliminating two hydroxyl groups from a diol compound; X1 and X2 are bonds formed by reaction of the functional group of the organic compound with one of the two isocyanate groups of the diisocyanate compound; and m and n=1 to 20, m+n?25, and p=0 to 39, provided that the number of carbodiimide groups in one molecule is 2 to 40.

Abstract: Provided are a polycarbodiimide compound that enables an aqueous resin composition capable of forming a coating (layer) having water resistance and adhesion that can withstand use for food packaging to be obtained, an aqueous resin composition containing the polycarbodiimide compound, and a food packaging having a layer formed of the aqueous resin composition.