| 摘要 |
<p>In a multi-color heat sensitive recording material comprising a substrate and two or more heat sensitive color-forming layers thereon capable of forming different colors from each other, at least one of the heat sensitive color-forming layers containing a leuco dye and an acidic substance, the recording material characterized in that at least one piperidine derivative represented by the formula [I] <CHEM> wherein R1 is C1 SIMILAR 30 aliphatic group residue which may have C2 SIMILAR 20 alkoxycarbonyl group, or C1 SIMILAR 30 aliphatic group residue which has ether linkage and oxycarbonyl group ; R2, R3, R4, R5 and X are each methyl group or hydrogen atom ; and l is an integer of 1 to 6, is incorporated at the position where a decolorizing function can be effected against the color-forming system comprising a leuco dye and an acidic substance.</p> |
