| abstract |
(B) A thermosensitive recording material comprises a thermosensitive recording layer containing an electron-donating colorless dye, an electron-accepting compound which develops color upon a reaction with the electron-donating colorless dye and a sensitizer, wherein the thermosensitive recording material satisfies at least one of the following conditions (1) to (3).n (1) An image density when thermal printing is performed with a printing energy is 1.20 or more, and the thermosensitive recording material is used for a recording device having a printing speed of 10 cm/sec or more. (2) An image density after the thermosensitive recording material is brought into contact with a heat source of 70° C. for 5 seconds is 0.15 or less, and the sensitizer is 2-benzyloxynaphthalene or the like. (3) the electron-accepting compound is a compound represented by R 1 -Ph-SO 2 R 2 wherein R 1 represents a hydroxyl group or an alkyl group, R 2 represents -Ph, —NH-Ph, -Ph-OR 3 or —NH—CO—NH-Ph, R 3 represents an alkyl group, Ph represents a phenyl group and may be substituted with a substituent containing SO 2 R 2 , and a volume-averaged grain size is in a range of 0.5 to 1.0 μm. |