Fluoran colorants for recording systems

Claim 1

A fluoran of the formula ##STR109## where R 1 is hydrogen or methyl, R 2 is hydrogen, C 1 -C 4 -alkyl, C 7 - or C 8 -phenylalkyl, cyanoethyl, chloroethyl or alkoxyalkyl having a total of 3 to 5 carbon atoms, R 3 is hydrogen, C 1 -C 4 -alkyl, C 7 -C 10 -phenylalkyl, C 5 - or C 6 -cycloalkyl, cyanoethyl, chloroethyl, alkoxyalkyl having a total of 3 to 5 carbon atoms, or phenyl which is unsubstituted or substituted by C 1 -C 4 -alkyl, methoxy, chlorine or bromine, or ##STR110## is N-pyrrolidinyl, N-piperidinyl, N-morpholinyl or N-isoindolinyl, R 4 and R 5 independently of one another are each hydrogen, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy or halogen, R 6 is hydrogen, halogen, C 1 -C 12 -alkyl, C 1 -C 4 -alkoxy, C 7 -C 10 -phenylalkoxy, phenoxy, phenyl, or a group of the formula ##STR111## where X 1 is hydrogen, C 1 -C 4 -alkyl, chloroethyl, alkoxyalkyl having a total of 3 to 5 carbon atoms, C 7 - or C 8 -phenylalkyl and X 2 is hydrogen, C 1 -C 12 -alkyl, chloroethyl, C 5 - or C 6 -cycloalkyl, alkoxyalkyl having a total of 3 to 5 carbon atoms, C 7 -C 10 -phenylalkyl, or phenyl which is unsubstituted or substituted by halogen, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, C 1 -C 4 -alkylcarbonyl, benzoyl or phenoxy, or is C 1 -C 4 -alkoxycarbonyl-C 1 -C 3 -alkyl, or carbamyl-C 1 -C 3 -alkyl, or ##STR112## is pyrrolidinyl, piperidinyl or morpholinyl, R 7 is hydrogen, C 1 -C 4 -alkyl or halogen and R 8 is C 1 -C 5 -alkyl, and the radicals R 4 and R 5 and/or R 6 and R 7 together can each be a --CH═CH--CH═CH-- bridge, and the fused-on ring can be unsubstituted or substituted by halogen or by amino which is unsubstituted or monosubstituted or disubstituted by C 1 -C 4 -alkyl or C 7 - or C 8 -phenylalkyl.