CHROMOGENIC DIHYDROQUINAZOLINES

• Main Authors: SIGMUND GUNZENHAUSER, HEINZ BALLI, IAN JOHN FLETCHER
• Format: Patent
• Language: English
• Published: 30.11.1983
• Subjects: ADHESIVES; CHEMISTRY; COLOUR PRINTING; DYES; HETEROCYCLIC COMPOUNDS; LAKES; LINING MACHINES; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; MORDANTS; NATURAL RESINS; ORGANIC CHEMISTRY; ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES; PAINTS; PERFORMING OPERATIONS; POLISHES; PRINTING; PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; STAMPS; TRANSPORTING; TYPEWRITERS

The invention relates to chromogenic dihydroquinazolines of the general formula: (1) wherein: the ring A is a monocyclic or polycyclic, unsubstituted or substituted heterocyclic radical which may contain further heteroatoms as ring members, each of X1, X2 and Y independently of one another is hydrogen, halogen, lower alkyl, lower alkanoylamino, or a group of the formula OR3 (1a) or (1b) X3 is hydrogen, halogen, lower alkyl or lower alkoxy; each of R1, R2, R3, R4, Z1 and Z2 independently of one another is C1-C12 alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or is cycloalkyl, phenyl, or phenyl or benzyl each substituted by halogen, nitro, lower alkyl or lower alkoxy, and the radicals R may also be hydrogen; or each pair of substituents (R1 and R2), (R3 and R4) and (Z1 and Z2) independently of one another, together with the nitrogen atom to which said pair is attached, is a 5- or 6-membered heterocyclic radical. These compounds are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials and produce lightfast blue, greenish blue or green colorations.