Fluoran derivatives and their use in recording materials

Details Fluoran derivatives and their use in recording materials Fluoran derivatives and their use in recording materials

1987-01-27

1989-06-06

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

544375, 546196, 548525, 549226, C07D26530, C07D40514, C07D31188

Patent

active

048372102

ABSTRACT:
The invention relates to novel fluoran compounds of the general formula ##STR1## wherein R.sub.1 and R.sub.2, each independently of the other, are lower alkyl;

REFERENCES:
patent: 3959571 (1976-05-01), Yahagi et al.
patent: 4330473 (1982-05-01), Hatano et al.
patent: 4442176 (1984-04-01), Nagaoka et al.
patent: 4444591 (1984-04-01), Kawai et al.
patent: 4536220 (1985-08-01), Kondo et al.
patent: 4629800 (1986-12-01), Yonese et al.

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