Recording material employing substituted 3,6-diaminophthalides a

Details Recording material employing substituted 3,6-diaminophthalides a Recording material employing substituted 3,6-diaminophthalides a

1979-09-17

1981-09-29

Hess, Bruce H.

Textiles: manufacturing

427151, 428307, 428537, 428913, 428914, B41M 516, B41M 518, B41M 522

Patent

active

042919029

ABSTRACT:
Substituted 3,6-diaminophthalides of the formula ##STR1## wherein each of R.sub.1, R.sub.2 and R.sub.3 independently represents alkyl of not more than 12 carbon atoms which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or represents cycloalkyl, benzyl, or benzyl which is substituted by halogen, lower alkyl or lower alkoxy, and R.sub.1 can also be hydrogen and R.sub.3 can also be phenyl, or R.sub.1 and R.sub.2, together with the nitrogen atom to which they are attached, represent a 5- or 6-membered heterocyclic radical and the ring A is unsubstituted or substituted or contains a fused, unsubstituted or substituted benzene or heterocyclic ring.
These compounds are suitable in particular for use as color formers in pressure-sensitive or heat-sensitive recording materials.

REFERENCES:
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patent: 4055358 (1977-10-01), Garner et al.
patent: 4189171 (1980-02-01), Crounse et al.
patent: 4191690 (1980-03-01), Burri
patent: 4200313 (1980-04-01), Schmidt et al.
Miyazawa et al., Chem. Abstracts, vol. 85, 1976, p. 22774n.

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