Patent ID: 8039419

Claim:
A heat sensitive recording material comprising a heat sensitive recording layer provided on a support, wherein the heat sensitive recording layer comprises a hollow particle and a heat sensitive coloring component comprising a combination of electron-donating dye precursor fine particles having a volume-average particle diameter of 0.5 μm to 2.0 μm and electron-accepting compound fine particles having a volume-average particle diameter of 0.5 μm to 2.0 μm and reacting with the electron-donating dye precursor upon application of heat energy to thereby develop color, wherein the electron-accepting compound comprises an electron-accepting compound represented by formula (I) below and an electron-accepting compound selected from salicylic acid derivatives and polyvalent metal salts thereof, wherein R 1 and R 2 independently represent a hydrogen atom, an alkyl group, an alkenyl group, a hydroxyl group, a halogen atom or —SO 2 Ar; R 3 represents —Ar, —NH—Ar or —NH—CO—NH—Ar, where Ar represents an aromatic ring and may be substituted with at least one selected from the group consisting of hydroxyl group, an alkyl group, an alkenyl group, an alkoxy group, a halogen atom and a substituent group containing —SO 2 Ar; and X represents a divalent linking group represented by any of the following, wherein Y and Z independently represent a hydrogen atom or an alkyl group, and Y and Z may be bound to each other to form a ring.