Patent ID: 8546299

Claim:
A recording material that contains a color-developing composition comprising a reaction composition as a major component, wherein the reaction composition contains a mixture of compounds represented by formula (III): where: each R independently represents a halogen atom, a C1-C6 alkyl group, or a C2-C6 alkenyl group; Y either represents: a linear, branched, or cyclic C1-C12 hydrocarbon group that may have an ether bond, or represents one of the following formulas: where: R′ represents a methylene group or ethylene group; and T represents a hydrogen atom or C1-C4 alkyl group; m represents an integer of 0 to 4; and n represents an integer of 1 to 6; which is obtained by reacting a dihydroxydiphenylsulfone derivative represented by formula (I): where each R and m is as defined above; with a dihalide represented by formula (II): X—Y—X (II) where X represents a halogen atom and Y has the same meaning as defined above; wherein: a content of a n=1 compound of formula (III) in the reaction composition is 10 to 60% by mass relative to a solid content of the entire reaction composition; and a content of the dihydroxydiphenylsulfone derivative represented by formula (I) in the reaction composition is 2% by mass or less relative to the solid content of the entire reaction composition.