Polyphenylene ether composition

A polyphenylene ether composition comprising:

• 60% mol % or more of a modified polyphenylene ether having a structure of the following Formula (1)′,
• a ratio of an integrated value of a peak appearing at 7.6 to 8.3 ppm to an integrated value of a peak derived from the structure of the following Formula (2)′ is 1 or less in a 1H-NMR measurement result, and
• a number average molecular weight in terms of polystyrene is 500 to 15000 g/mol,
• (in Formula (1)′, Z is an a-valent partial structure represented by the following Formula (2)′, a represents an integer of 2 to 6, A each independently represents a hydrogen atom or a substituent containing a carbon-carbon double bond and/or an epoxy group, not all A are hydrogen atoms, Y are each independently a divalent linking group having a structure of the following Formula (4)′, n represents a repeating number of Y and are each independently an integer of 0 to 200, and at least one n in a (—Yn-A) is an integer of 1 or more)
• in Formula (2)′, X is an a-valent alkyl skeleton, R5 are each independently an optional substituent, k are each independently an integer of 1 to 4, and at least one R5 is a partial structure represented by the following Formula (3)′,
• in Formula (3)′, R11 are each independently an optionally substituted alkyl group having a carbon number of 1 to 8, R12 are each independently an optionally substituted alkylene group having a carbon number of 1 to 8, b are each independently 0 or 1, and R13 represents one of a hydrogen atom, an optionally substituted alkyl group having a carbon number of 1 to 8 or an optionally substituted phenyl group,
• when the position of the carbon atom of the benzene ring to which —O— is bonded in Formula (2)′ is designated as Position 1, R5 having the partial structure of Formula (3)′ is bonded to one carbon atom at Position 2 or Position 6, and a hydrogen atom, a methyl group, or an ethyl group is bonded to the other carbon atom at Position 2 or Position 6, and
• in Formula (4)′, R21 are each independently one of a hydrogen atom, an optionally substituted hydrocarbon group having a carbon number of 1 to 6, an optionally substituted aryl group having a carbon number of 6 to 12, and a halogen atom, and two R21 cannot be both hydrogen atoms, and two R21 are not in a combination in which one R21 is the partial structure represented by the above Formula (3)′ and the other R21 is one of a hydrogen atom, a methyl group, or an ethyl group, and R22 are each independently one of a hydrogen atom, an optionally substituted hydrocarbon group having a carbon number of 1 to 6, an optionally substituted aryl group having a carbon number of 6 to 12, and a halogen atom.