Abstract: An object of the present invention is to provide a catalyst which decomposes a peroxide effectively and economically under a high temperature while suppressing generation of free radicals, and the present invention provides a peroxide decomposition catalyst containing a base metal atom, wherein a value A indicating a free radical generation amount represented by the (equation 1) is not more than 0.20, and a value B indicating a reaction rate represented by the (equation 2), which can be easily applied to utility such as an agent for preventing deterioration of a polymer electrolyte-type fuel cell and a water electrolysis apparatus, and an antioxidant for medicaments, agrochemicals and foods. A=(Mw(S)/Mw)?1 ??(equation 1) (wherein Mw is a weight average molecular weight of poly(sodium 4-styrenesulfonate) after a hydrogen peroxide decomposition test in the test at 80° C.

Abstract: A method of producing a polyarylene oxide comprising a step of oxidative polymerization of a monomer represented by the general formula (1) in an organic solvent in the presence of a transition metal compound, wherein, Ar represents a benzene ring or a naphthalene ring, R1 represents a hydrocarbon group optionally substituted, a hydrocarbonoxy group optionally substituted, or a halogen atom; a represents an integer of 0 to 5, and when a is 2 or more, R1s may be the same or different, adjacent R1s may mutually bond to form a ring; R2 represents a single bond or an arylene group; R3 represents a hydrocarbon group optionally substituted or a trialkylsilyl group.

Abstract: Provided is a method for producing a phenol condensate by oxidative condensation of a phenol compound not having a substituted group on at least one ortho-position, in the presence of a specific complex (II) and oxygen, wherein a condensate coupled at para-position of the phenol can be produced in an excellent yield, L-M (X)n??(II) wherein L represents a ligand having 2 to 4 nitrogen atoms as donor atoms, M represents copper ion, nickel ion, cobalt ion, iron ion, manganese ion, chromium ion or vanadyl ion, X represents a counter ion, n is a number of Xs.

Abstract: A method of producing a polyarylene oxide comprising a step of oxidative polymerization of a monomer represented by the general formula (1) in an organic solvent in the presence of a transition metal compound, wherein, Ar represents a benzene ring or a naphthalene ring, R1 represents a hydrocarbon group optionally substituted, a hydrocarbonoxy group optionally substituted, or a halogen atom; a represents an integer of 0 to 5, and when a is 2 or more, R1s may be the same or different, adjacent R1s may mutually bond to form a ring; R2 represents a single bond or an arylene group; R3 represents a hydrocarbon group optionally substituted or a trialkylsilyl group.

Abstract: There is disclosed a crystallizable poly(2,5-di-substituted-1,4-phenylene oxide), which exhibits an exothermic peak for crystallization of not less than 5 J/g at 150° C. or over when cooled after melting, and/or an endothermic peak, at the time of melting of crystals thereof, of not less than 5 J/g at 150° C. or over when re-heated after cooling of the melt, and which comprises a recurring unit of the following formula (I), and a method of preparing the same by polymerization of a 2,5-di-substituted-phenol of the following formula (II) by use of a copper complex catalyst made of a tridentate ligand of which nitrogen atoms coordinate to a copper atom in coexistence with oxygen: wherein R1's independently represent a hydrocarbon group or a substituted hydrocarbon group, and they may be the same or different. The crystallizable poly(2,5-di-substituted-1,4-phenylene oxide) is able to provide a melt molding which has a reduced degree of coloration and good heat resistance.

Abstract: Provided is a method for producing a phenol condensate by oxidative condensation of a phenol compound not having a substituted group on at least one ortho-position, in the presence of a specific complex (II) and oxygen, wherein a condensate coupled at para-position of the phenol can be produced in an excellent yield,

Abstract: An oxidation polymer of a substituted phenol, obtained by oxidative polymerization of at least one compound selected from the group consisting of a compound of formula (Ia) and a compound of formula (Ib), in which the oxidation polymer has a number-average polymerization degree of 3 or more: wherein R1 to R4 each represent a hydrogen atom and the like; provided that at least one of R1 to R4 represents a substituted or unsubstituted, saturated hydrocarbon group having 10 or more carbon atoms, and R1 and/or R4 represent a hydrogen atom; wherein R11 represents a substituted or unsubstituted, saturated hydrocarbon group having 15 or more carbon atoms, and R12 is the same as R11, or when R12 is different from R11, R12 represents a substituted or unsubstituted hydrocarbon group and the like.

Abstract: There is disclosed a crystallizable poly(2,5-di-substituted-1,4-phenylene oxide), which exhibits an exothermic peak for crystallization of not less than 5 J/g at 150° C. or over when cooled after melting, and/or an endothermic peak, at the time of melting of crystals thereof, of not less than 5 J/g at 150° C. or over when re-heated after cooling of the melt, and which comprises a recurring unit of the following formula (I), and a method of preparing the same by polymerization of a 2,5-di-substituted-phenol of the following formula (II) by use of a copper complex catalyst made of a tridentate ligand of which nitrogen atoms coordinate to a copper atom in coexistence with oxygen: wherein R1's independently represent a hydrocarbon group or a substituted hydrocarbon group, and they may be the same or different. The crystallizable poly(2,5-di-substituted-1,4-phenylene oxide) is able to provide a melt molding which has a reduced degree of coloration and good heat resistance.

Abstract: There is disclosed a crystallizable poly(2,5-di-substituted-1,4-phenylene oxide), which exhibits an exothermic peak for crystallization of not less than 5 J/g at 150° C. or over when cooled after melting, and/or an endothermic peak, at the time of melting of crystals thereof, of not less than 5 J/g at 150° C.

Abstract: There is disclosed a (2,5-disubstituted-1,4-phenylene oxide) block copolymer which comprises one or more block structural units represented by formula (I) and at least one particular divalent structural unit in a molecule. There is also disclosed a (2,5-disubstituted-1,4-phenylene oxide) graft polymer which comprises one or more structural units of formula (IV), or three or more of structural unit of formula (IV) and particular divalent structural unit, in a molecule. (wherein R1 represents an unsubstituted or substituted hydrocarbon group, and the two R1s may be the same or different; a represents a number average degree of polymerization and is 5 or more; R4 represents a trifunctional unsubstituted or substituted hydrocarbon group; U represents —CO—, —OCO—, or —NHCO—; and f is 1 or 0.

Abstract: An oxidation polymer of a substituted phenol, obtained by oxidative polymerization of at least one compound selected from the group consisting of a compound of formula (Ia) and a compound of formula (Ib), in which the oxidation polymer has a number-average polymerization degree of 3 or more: 1

Abstract: There is disclosed a (2,5-disubstituted-1,4-phenylene oxide) block copolymer which comprises one or more block structural units represented by formula (I) and at least one particular divalent structural unit in a molecule. There is also disclosed a (2,5-disubstituted-1,4-phenylene oxide) graft polymer which comprises one or more structural units of formula (IV), or three or more of structural unit of formula (IV) and particular divalent structural unit, in a molecule.

Abstract: A resin composition comprising a polyphenylene ether having, on the average, 0.01 to 10 terminal structures of the formula (1): ##STR1## wherein R.sub.1 to R.sub.5 are each hydrogen, halogen, a substituted or unsubstituted alkyl, alkenyl or alkynyl group, or a substituted or unsubstituted aryl group, R.sub.6 is a substituted or unsubstituted alkylene group, and R.sub.7 to R.sub.11 are each hydrogen, halogen, an alkyl group, an alkoxy group, a phenyl group, a phenoxy group, a nitro group or a cyano group per 100 phenylene ether units, and a primary aliphatic monoamine having an aromatic substituent, which composition has good thermal stability.