Fluoran compounds and color forming recording materials using same

Abstract

Fluoran compounds are disclosed of formula (I) ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 independently represent hydrogen, halogen, lower alkoxy, C.sub.1 -C.sub.9 -alkyl, C.sub.5 or C.sub.6 -cycloalkyl, benzyl or phenyl, said benzyl or phenyl being optionally substituted by halogen, lower alkyl or lower alkoxy, and further R.sub.1 and R.sub.2 as well as R.sub.3 and R.sub.4 taken together with Ring A, may form a naphthalene ring optionally substituted by halogen, lower alkyl or lower alkoxy, R.sub.5, R.sub.6 and R.sub.7 independently represent halogen, lower alkyl or lower alkoxy, B.sub.1 and B.sub.2 independently represent hydrogen, C.sub.1 -C.sub.8 -alkyl, benzyl or phenyl, said benzyl or phenyl being optionally substituted by halogen, lower alkyl, lower alkoxy, or alkyl-substituted, X represents hydrogen atom or --NR.sub.8 R.sub.9 wherein R.sub.8 and R.sub.9 independently represent hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 or C.sub.6 -cycloalkyl, or benzyl, said benzyl being optionally substituted by halogen, lower alkyl, lower alkoxy, or alkyl-substituted, and further R.sub.8 and R.sub.9 taken together with the adjacent nitrogen atom to which they are attached, may form a pyrrolidino, piperidino or morpholino ring, Ring B being optionally substituted by halogen, n, p and q independently represent 0, 1 or 2, and m represents 0, 1, 2 or 3, provided that when m is 0 or 1, X is not hydrogen atom. The compounds are used, together with a developer, in color forming recording materials such as pressure-sensitive copying papers, heat-sensitive recording papers and the like.