| 摘要 |
Chromogenic 1-heterocyclic substituted 2,4-benzoxazines of formula <IMAGE> (1) wherein X1 and X2 are identical or different monocyclic or polycyclic heteroaromatic radicals and X2 is also an aryl radical, Y is hydrogen, alkyl, cycloalkyl, aryl, aralkyl or a heterocyclic radical, and the benzene ring A is substituted by halogen, cyano, nitro, lower alkyl, lower alkoxy, lower alkylthio, lower alkylcarbonyl, lower alkoxycarbonyl or -NR1R2, in which R1 and R2 are each independently of the other hydrogen, alkyl of not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxy, cyano or lower alkoxy, or are cycloalkyl of 5 to 10 carbon atoms, or phenalkyl or phenyl, each unsubstituted or ring-substituted by halogen, cyano, lower alkyl or lower alkoxy, or -NR1R2 is a 5- or 6-membered, preferably saturated, heterocyclic radical. These benzoxazines are particularly suitable for use as color formers in pressure-sensitive or heat-sensitive recording materials and give strong and lightfast orange, pink, red, violet, green, greenish-blue, violet blue, grey or black colorations.
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