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 and a polyester resin composition and polyester resin modifier using the polycarbodiimide compound, the polycarbodiimide compound having a small amount of residual amine and having good processability when the polycarbodiimide compound is added to the polyester resin while keeping hydrolysis resistance of polyester resin imparted thereto through addition of the polycarbodiimide compound. A polycarbodiimide compound represented by the following general formula (1): RmNH2-m—CO—NH—Z—(N?C?N—Z)n—NH—CO—NH2-mRm (1) is used, wherein Rm is a hydrocarbon residue of an amine compound which is represented by RmNH3-m and has a boiling point at 1 atm of 150° C. or lower; m is 1 or 2; Z is a residue obtained by removing two isocyanate groups from an aliphatic diisocyanate compound; and n is any integer of 2 to 7.

Abstract: There are provided a resin additive with which the generation of an isocyanate gas during the production of a master batch or a resin composition can be effectively suppressed when a carbodiimide compound is used as an additive for improving the hydrolysis resistance of a resin, a master batch using the above resin additive, and a method for producing the same, and a resin composition using the above resin additive, and a method for producing the same. A resin additive comprising a carbodiimide compound (A) and a surfactant (B), and a master batch and a resin composition comprising the above resin additive and a resin (D), and methods for producing these.

Abstract: The present invention relates to a process for producing a polyester resin composition, including the step of mixing a polyester resin (A), an aromatic carbodiimide (B) and an aliphatic polycarbodiimide (C) at a temperature not lower than a melting temperature of the polyester resin, in which the polyester resin (A) and the aromatic carbodiimide (B) are mixed in the presence of the aliphatic polycarbodiimide (C).

Abstract: The present invention provides an ester-based resin composition having a hydrolysis resistance which is free from significant increase in melt viscosity and solution viscosity. The ester-based resin composition of the present invention includes an ester-based resin, an aliphatic polycarbodiimide other than a xylylene-based aliphatic polycarbodiimide, and a xylylene-based polycarbodiimide, in which a mass ratio of the aliphatic polycarbodiimide other than a xylylene-based aliphatic polycarbodiimide to the xylylene-based polycarbodiimide [(aliphatic polycarbodiimide other than xylylene-based aliphatic polycarbodiimide)/(xylylene-based polycarbodiimide)] is from 0.1 to 10.0.

Abstract: The present invention relates to a polyester resin composition including a polyester resin (A), an aromatic carbodiimide (B) and an aliphatic polycarbodiimide (C), the polyester resin (A) being a polyester resin (a-1) produced from an aliphatic polycarboxylic acid and a dialkyl ester thereof, or an aliphatic polycarboxylic acid anhydride, and an aliphatic polyol, a polyester resin (a-2) produced from an aromatic polycarboxylic acid and a dialkyl ester thereof, or an aromatic polycarboxylic acid anhydride, and an aliphatic polyol, a polyester resin (a-3) produced from 3-hydroxyalkanoic acid, polyethylene terephthalate (a-4), or a polyester resin (a-5) constituted of a copolymer of the polyester resins (a-1) and (a-2).

Abstract: The present invention relates to a process for producing a polyester resin composition, including the step of mixing a polyester resin (A), an aromatic carbodiimide (B) and an aliphatic polycarbodiimide (C) at a temperature not lower than a melting temperature of the polyester resin, in which the polyester resin (A) and the aromatic carbodiimide (B) are mixed in the presence of the aliphatic polycarbodiimide (C).

Abstract: A resin crosslinking agent that is capable of enhancing the scuffing resistance and the chemical resistance upon adding a carbodiimide compound as a crosslinking agent to an aqueous resin. The resin crosslinking agent contains: a carbodiimide compound having at least one carbodiimide group, having terminals that are capped with at least one compound (hydrophilic organic compound I) selected from a dialkylamino alcohol, a hydroxycarboxylic acid alkyl ester and a (poly)alkylene glycol monoalkyl ether, and with a compound (hydrophilic organic compound II) that has higher hydrophilicity than the hydrophilic organic compound I and has at least one hydroxyl group; and a water-miscible liquid compound.

Abstract: A resin crosslinking agent that is capable of enhancing the scuffing resistance and the chemical resistance upon adding a carbodiimide compound as a crosslinking agent to an aqueous resin. The resin crosslinking agent contains: a carbodiimide compound having at least one carbodiimide group, having terminals that are capped with at least one compound (hydrophilic organic compound I) selected from a dialkylamino alcohol, a hydroxycarboxylic acid alkyl ester and a (poly)alkylene glycol monoalkyl ether, and with a compound (hydrophilic organic compound II) that has higher hydrophilicity than the hydrophilic organic compound I and has at least one hydroxyl group; and a water-miscible liquid compound.

Abstract: Fuel cell separators which are highly hydrophilic and undergo little leaching of substances that inhibit power generation can be produced by shaping a composition made primarily of an electrically conductive powder and a binder to form a shaped body, coating and impregnating the shaped body with a metal oxide-containing hydrophilic resin, then curing the hydrophilic resin.