Fluoran compounds and recording sheets containing them.

摘要

Fluoran compounds of the structural formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="49" wi="84" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein R<Sub>1</Sub> is propyl or butyl, R<Sub>2</Sub> is an alkyl of from one to four carbon atoms, R<Sub>3</Sub> is methyl or ethyl, and R<Sub>4</Sub> is hydrogen or methyl are particularly suitable for use in providing high quality pressure, heat or electrothermal sensitive recording sheets containing a color former in operative association with an electron-accepting substance.