| 摘要 |
The present invention is directed to recording materials characterized in that the recording materials comprise at least one of diphenyl sulfone derivatives represented by the following general formula (I); wherein Y represents a linear or branched (un)-saturated C1-C12 hydrocarbon group, a C1-C8 hydrocarbon group having an ether linkage, or a group represented by a general formula; wherein R represents methylene or ethylene; R1, R2, R3 and R4 represent each independently lower alkyl or lower alkenyl; m represents 0 or an integer of 1 or 2,; and n, p, q and r represent each independently 0 or an integer of 1 to 4, provided when n, p, q and r are each 2 or above, the substituents represented by R1, R2, R3 and R4 may be each different from one another.
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