Heat sensitive record material.

摘要

A heat sensitive record material comprising a support sheet and a record layer formed on the support sheet, the record layer being composed essentially of a colorless or light-colored fluoran compound, an acidic substance which is thermally reactive with the fluoran compound to develop a color and a binder, characterized in that said record layer contains an effective amount of at least one benzenesulfonamide compound represented by the general formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="18" wi="60" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>where R, is a hydrogen atom, a C<Sub>1</Sub>-C<Sub>5</Sub> alkyl group, an acetylamino group or a halogen atom, R<Sub>2</Sub> is a hydrogen atom, a C<Sub>1</Sub>-C<Sub>5</Sub> alkyl group, a cyclohexyl group or a phenyl group which may be substituted and R<Sub>3</Sub> is a C<Sub>1</Sub>-C<Sub>5</Sub> alkyl group, a cyclohexyl group or a phenyl group which may be substituted, provided R<Sub>2</Sub> and R<Sub>3</Sub> may form together with N a saturated ring.