Fluoran derivatives, process for preparation thereof and recording material containing the same.

摘要

A fluoran derivative useful for a heat-sensitive recording material, having the following general formula I;
<Chemistry id="chema01" num="0001"><Image id="ia01" he="73" wi="86" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein R<Sub>1</Sub> and R<Sub>2</Sub>, which may be the same or different, stand for an alkyl group having 1 to 9 carbon atoms, a cycloalkyl group having 3 to 6 carbon atoms, a phenyl group or a phenyl group substituted by an alkyl group having 1 to 4 carbon atoms, and R<Sub>3</Sub> and R<Sub>4</Sub>, which may be the same or different, stand for an alkyl group having 1 to 6 carbon atoms or a phenyl group or R<Sub>3</Sub> and R<Sub>4</Sub> may form a 5- to 8-membered cycloalkane together with the carbon atom to which they are bonded.