Abstract: Disclosed herein are an electrically conductive resinous composition composed mainly of an electrically conductive carbon powder and a binding agent, wherein said binding agent is a mixture of a thermoplastic resin and a carbodiimide compound, a fuel cell separator and a process for production thereof, and polymer electrolyte fuel cell. The present invention permits efficient mass production of fuel cell separators having high elasticity, good releasability, good dimensional accuracy, and good gas impermeability. The polymer electrolyte fuel cell, in which all or part of separators are those pertaining to the present invention, is immune to the cracking of separators at the time of assembling, decreases only a little in output after continuous operation, and exhibits good gas sealing performance and high impact resistance.

Abstract: The present invention provides: an electroconductive resin composition comprising: (A) a liquid crystal polyester resin capable of forming an anisotropic melt phase, in an amount of 100 parts by weight, (B) a carbodiimide compound in an amount of 0.01 to 30 parts by weight, (C) an electroconductive carbon powder in an amount of 50 to 3,000 parts by weight, and (D) a filler in an amount of 0 to 10,000 parts by weight; a fuel cell separator made of the above electroconductive resin composition; a process for producing the above fuel cell separator; and a solid polymer type fuel cell using the above fuel cell separator. The electroconductive resin composition alleviates the problems of the prior art, can be mass-produced, and is superior in high temperature resistance and hydrolysis resistance.

Abstract: There are provided a polyamide resin composition which alleviates the drawbacks of the prior art and which is improved in resistance to hydrolysis particularly in an acidic medium of high temperatures, oil resistance and metal halide resistance; and a member made from the above polyamide resin composition, which can be applied even to sites where the use of a metallic member has been necessary. The polyamide resin composition of the present invention comprises a polyamide resin and a carbodiimide compound and, owing to the use of the carbodiimide compound, is improved in hydrolysis resistance, oil resistance and metal halide resistance; and the member of the present invention is made from the above polyamide resin composition.

Abstract: Disclosed herein are an electrically conductive resinous composition composed mainly of an electrically conductive carbon powder and a binding agent, wherein said binding agent is a mixture of a thermoplastic resin and a carbodiimide compound, a fuel cell separator and a process for production thereof, and polymer electrolyte fuel cell. The present invention permits efficient mass production of fuel cell separators having high elasticity, good releasability, good dimensional accuracy, and good gas impermeability. The polymer electrolyte fuel cell, in which all or part of separators are those pertaining to the present invention, is immune to the cracking of separators at the time of assembling, decreases only a little in output after continuous operation, and exhibits good gas sealing performance and high impact resistance.

Abstract: A method for obtaining polyester resin products having a desired strength and a mixture used in a method for obtaining polyester resin products having a desired strength. In the method and mixture a carbodiimide compound is added to a polyester resin. According to the method and mixture, polyester resin pellets having a desired strength can be obtained by adding a carbodiimide compound to a recovered polyester resin such as a recovered PET resin. Strength of the polyester resin during processing of the polyester resin is maintained.

Abstract: A polyacetal resin composition comprising a polyacetal resin and a polycarbodiimide compound. The polyacetal resin composition is free from the problems of conventional polyacetal resins and has good water resistance at high temperatures.

Abstract: A printing and recording sheet comprises a substrate and an ink receiving layer of a crosslinked product of a composition which comprises a polymer resin and a crosslinking agent comprising a water-soluble or dispersible carbodiimide compound which is a condensation reaction product obtained by decarbonation condensation of at least one diisocyanate or a mixture of at least one diisocyanate and at least one triisocyanate. The reaction product is blocked at terminal isocyanate groups with a hydrophilic group.

Abstract: A polyurethane resin obtained from a diol component and a diisocyanate component by an ordinary process, wherein the diisocyanate component comprises:at least one kind of unmodified diisocyanate, andat least one kind of carbodiimide-modified aromatic diisocyanate having, at one or both of the ortho positions of the two isocyanate groups, an aliphatic, alicyclic or aromatic substituent of one or more carbon atoms, or at least one kind of carbodiimide-modified aliphatic diisocyanate wherein at least one of the two carbons each bonded with an isocyanate group is di- or tri-substituted, and the molar ratio of the unmodified diisocyanate and the carbodiimide-modified diisocyanate is 35-0.1:1. The polyurethane resin containing carbodiimide bonds in the molecular chain alleviates the problems of the prior art and exhibits hydrolysis resistance stably over a long period of time without losing the carbodiimide bonds out of the molecule.

Abstract: The present invention provides an aqueous surface-treating agent and method for surface treatment of reinforcing material, which includes a carbodiimide compound as a main component; a reinforcing material surface-treated with the above aqueous surface-treating agent; and a composite material comprising a matrix and the above reinforcing material. The aqueous surface-treating agent has good storage stability, gives no bad effect on human health owing to no use of organic solvent and, when used for the surface treatment of a reinforcing material, can produce a surface-treated reinforcing material which can produce a composite material comprising a matrix and the surface-treated reinforcing material and having high adhesivity between the two components.

Abstract: The present invention provides an aqueous surface-treating agent and method for surface treatment of reinforcing material, which includes a carbodiimide compound as a main component; a reinforcing material surface-treated with the above aqueous surface-treating agent; and a composite material comprising a matrix and the above reinforcing material. The aqueous surface-treating agent has good storage stability, gives no bad effect on human health owing to no use of organic solvent and, when used for the surface treatment of a reinforcing material, can produce a surface-treated reinforcing material which can produce a composite material comprising a matrix and the surface-treated reinforcing material and having high adhesivity between the two components.

Abstract: A hydrolysis stabilizer for an ester group-containing resin, which comprises as a main component a carbodiimide having at least two carbodiimide groups in the molecule and resulting from 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate or a mixture of 4,4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate, or from a mixture of tetramethylxylylene diisocyanate with 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate or a mixture of 4,4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate; and a process for the hydrolysis stabilization of an ester group-containing resin, which comprises mixing a polyester type resin with the above hydrolysis stabilizer.

Abstract: A carbodiimide crosslinking agent comprises, as its main component, a decarbonated condensate of (A) one or more isocyanates selected from isocyanates having at least two isocyanate groups bonded to the carbon of the methylene group in the molecule, and (B) one or more isocyanates selected from alicyclic or aliphatic diisocyanates other than those defined in (A). The condensate is blocked at terminal isocyanates thereof with a hydrophilic group. A process for preparing the crosslinking agent, and a coating material comprising the agent are also described, along with a specific type of crosslinking agent for polyvinyl alcohols.

Abstract: The present invention provides:(A) a curing agent for powder coatings, which comprises, as a main component, a carbodiimide compound represented by the following general formula (1), (2) or (3):OCN--R.sub.1 --(NCN--R.sub.2).sub.n1 --NCO (1)R.sub.3 --NCN--R.sub.4 --(NCN--R.sub.5).sub.n2 --NCN--R.sub.6(2)R.sub.7 --R.sub.8 --(NCN--R.sub.9).sub.n3 --R.sub.10 (3)(B) a powder coating composition comprising:at least one kind of the above curing agent (A) for powder coating, anda bifunctional resin compound having a functional group reactive with carbodiimide group; and(C) powder coating film, which is obtained by reacting and curing at least one kind of the above curing agent (A) for powder coating, and a bifunctional resin compound having a functional group reactive with carbodiimide group.

Abstract: The present invention provides a biodegradable plastic composition obtained by adding a carbodiimide compound to a biodegradable plastic, and a method for control of biodegradation rate of biodegradable plastic, which comprises adding a carbodiimide compound to a biodegradable plastic. According to the present invention, the biodegradation rate of biodegradable plastic can be controlled stably.

Abstract: The present invention provides a biodegradable plastic composition obtained by adding a carbodiimide compound to a biodegradable plastic, and a method for control of biodegradation rate of biodegradable plastic, which comprises adding a carbodiimide compound to a biodegradable plastic. According to the present invention, the biodegradation rate of biodegradable plastic can be controlled stably.

Abstract: The present invention provides:an aqueous surface-treating agent used in a process for surface treatment of reinforcing material, which comprises a carbodiimide compound as a main component,a reinforcing material surface-treated with the carbodiimide compound, anda composite material comprising a matrix and the above reinforcing material.Said aqueous surface-treating agent has good storage stability, gives no bad effect on human health owing to no use of organic solvent and, when used for the surface treatment of a reinforcing material, can provide a surface-treated reinforcing material which can produce a composite material comprising a matrix and said surface-treated reinforcing material and having high adhesivity between the two components.

Abstract: The present invention provides:a hydrolysis stabilizer for ester group-containing resin, comprising, as the main component, a carbodiimide which is derived from tetramethylxylylene diisocyanate, and which has remaining isocyanate groups in an amount of 3% by weight or less or has the terminal isocyanate groups blocked with a monoisocyanate(s); anda method for hydrolysis stabilization of ester group-containing resin, which comprises mixing an ester group-containing resin with a carbodiimide which is derived from tetramethylxylylene diisocyanate represented by the above formula and which has remaining isocyanate groups in an amount of 3% by weight or less or has the terminal isocyanate groups blocked with a monoisocyanate(s).

Abstract: A hydrolysis stabilizer for an ester group-containing resin, which comprises as a main component a carbodiimide having at least two carbodiimide groups in the molecule and resulting from 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate or a mixture of 4,4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate, or from a mixture of tetramethylxylylene diisocyanate with 4,4'-dicyclohexylmethane diisocyanate, isophorone diisocyanate or a mixture of 4,4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate; and a process for the hydrolysis stabilization of an ester group-containing resin, which comprises mixing a polyester type resin with the above hydrolysis stabilizer.

Abstract: The present invention provides a hydrophilic resin composition which is obtained by adding, to a hydrophilic resin selected from a carboxyl group-containing hydrophilic acrylic copolymer resin, a carboxyl group-containing hydrophilic polyester resin and a carboxyl group-containing hydrophilic polyurethane resin, a hydrophilic carbodiimide represented by the following general formula (1): ##STR1## (wherein n is an average polymerization degree and is an integer of 1-30; m is an integer of 4-30; R.sub.1 is a lower alkyl group; and R.sub.2 is a hydrogen atom or a methyl group) and which has an acid value based on the carboxyl group of the hydrophilic resin, of 10-400 mg KOH/g and a molar ratio of the carbodiimide group to the carboxyl group, of 0.2-5.0.

Abstract: An aqueous coating composition for the manufacture of precoated metal is based on an aqueous resin having a carboxyl group in a molecule and neutralizable with a basic material as a binder, the aqueous resin being selected from an acrylic copolymer resin, polyester resin, and polyurethane resin. A mono- or poly-carbodiimide compound is blended with the aqueous resin. The composition forms a coating having improved chemical resistance, water resistance, and adhesion to sheet metal.