A method of producing a polymer composition is provided, including: kneading (A) a conjugated diene-based polymer that is a polymer of a conjugated diene compound or a copolymer of a conjugated diene compound and an aromatic vinyl compound, and is a reaction product between an active polymerization end and a compound represented by any one of the general formulae (1) to (3), and (B) a basic compound having an acid dissociation constant of 8.0 or more; and kneading a kneaded product from (A) and a crosslinking agent.

A method of producing a polymer composition is provided, including: kneading (A) a conjugated diene-based polymer that is a polymer of a conjugated diene compound or a copolymer of a conjugated diene compound and an aromatic vinyl compound, and is a reaction product between an active polymerization end and a compound represented by any one of the general formulae (1) to (3), and (B) a basic compound having an acid dissociation constant of 8.0 or more; and kneading a kneaded product from (A) and a crosslinking agent.

This disclosure provides a composition comprising a mixture of molecules of Formula (I): {RO-[CH(CH.sub.3)CH.sub.2O)]b[CH.sub.2-CH.sub.2O]a}.sub.mP(=O)(O.sup.−X.sup.+).sub.n(I), wherein R is chosen from linear or branched C.sub.10-C.sub.18 alkyl or alkenyl groups; a is 0 to 50, b is 0-30, and a+b >0; X.sup.+ is potassium, triethanolamine, or H, and m and n are each equal to 1 or 2, such that when m=1 then n=2, and when m=2 then n=1. Moreover, in the mixture some of the molecules have m=1 and n=2 and some of the molecules have m=2 and n=1, wherein the mole ratio of compounds where m=1 to compounds where m=2 is of from 1:1 to 3:1.

This disclosure provides a composition comprising a mixture of molecules of Formula (I): {RO-[CH(CH.sub.3)CH.sub.2O)]b[CH.sub.2-CH.sub.2O]a}.sub.mP(=O)(O.sup.−X.sup.+).sub.n(I), wherein R is chosen from linear or branched C.sub.10-C.sub.18 alkyl or alkenyl groups; a is 0 to 50, b is 0-30, and a+b >0; X.sup.+ is potassium, triethanolamine, or H, and m and n are each equal to 1 or 2, such that when m=1 then n=2, and when m=2 then n=1. Moreover, in the mixture some of the molecules have m=1 and n=2 and some of the molecules have m=2 and n=1, wherein the mole ratio of compounds where m=1 to compounds where m=2 is of from 1:1 to 3:1.

A polyphenylene ether resin modified with benzoxazine, a method for producing the same, and a substrate material for a circuit board are provided. The polyphenylene ether resin modified with the benzoxazine has a structural formula as follows:

##STR00001## in which R represents a chemical group that is located between two hydroxyphenyl functional groups of a bisphenol compound, and n is an integer between 3 and 25, inclusive.

A polyphenylene ether resin modified with benzoxazine, a method for producing the same, and a substrate material for a circuit board are provided. The polyphenylene ether resin modified with the benzoxazine has a structural formula as follows:

##STR00001## in which R represents a chemical group that is located between two hydroxyphenyl functional groups of a bisphenol compound, and n is an integer between 3 and 25, inclusive.

A photochromic curable composition comprising a radically polymerizable monomer having at least one oxetanyl group in one molecule, a photochromic compound and radically polymerizable monomers other than the above polymerizable monomer, and a photochromic cured body obtained by polymerizing the photochromic curable composition.

A photochromic curable composition comprising a radically polymerizable monomer having at least one oxetanyl group in one molecule, a photochromic compound and radically polymerizable monomers other than the above polymerizable monomer, and a photochromic cured body obtained by polymerizing the photochromic curable composition.

This disclosure provides a composition comprising a mixture of molecules of Formula (I): {RO—[CH(CH.sub.3)CH.sub.2O)].sub.b[CH.sub.2—CH.sub.2O].sub.a}.sub.mP(═O)(O.sup.−X.sup.+).sub.n (I), wherein R is chosen from linear or branched C.sub.10-C.sub.18 alkyl or alkenyl groups; a is 0 to 50, b is 0-30, and a+b>0; X.sup.+ is potassium, triethanolamine, or H, and m and n are each equal to 1 or 2, such that when m=1 then n=2, and when m=2 then n=1. Moreover, in the mixture some of the molecules have m=1 and n=2 and some of the molecules have m=2 and n=1, wherein the mole ratio of compounds where m=1 to compounds where m=2 is of from 1:1 to 3:1.

This disclosure provides a composition comprising a mixture of molecules of Formula (I): {RO—[CH(CH.sub.3)CH.sub.2O)].sub.b[CH.sub.2—CH.sub.2O].sub.a}.sub.mP(═O)(O.sup.−X.sup.+).sub.n (I), wherein R is chosen from linear or branched C.sub.10-C.sub.18 alkyl or alkenyl groups; a is 0 to 50, b is 0-30, and a+b>0; X.sup.+ is potassium, triethanolamine, or H, and m and n are each equal to 1 or 2, such that when m=1 then n=2, and when m=2 then n=1. Moreover, in the mixture some of the molecules have m=1 and n=2 and some of the molecules have m=2 and n=1, wherein the mole ratio of compounds where m=1 to compounds where m=2 is of from 1:1 to 3:1.