| abstract |
A thermal transfer sheet comprising a substrate having a coating comprising a dye which carries an (a) substituent, wherein R1 is an optionally substituted branched chain alkyl group; and R2 is an optionally substituted alkyl group or an optionally substituted aryl group provided that the dye is not a monoazo dye or that the dye is not 3-(2,3 - dihydroindol-1-yl)-2-[4-(isopropylpropylamino)-2-methylphenyllimino]-3-oxo-N-(2,4,5-trichlorophenyl)propionamide. |