Carbonless duplicating and marking systems

Details Carbonless duplicating and marking systems Carbonless duplicating and marking systems

1979-05-14

1981-06-23

Hess, Bruce H.

Textiles: manufacturing

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

Patent

active

042746604

ABSTRACT:
Dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans, esterified dialkylamino-substituted 2-anilino-5'/6'-carboxyfluorans and 3,3-(corresponding-substituted-diaryl)-5/6-carboxyphthalides useful as color formers, particularly in carbonless duplicating and thermal marking systems, are prepared by the interaction of 4/5-carboxy-2-(4-dialkylamino-substituted-2-hydroxybenzoyl)benzoic acids and substituted diphenylamines to produce the phthalides which are then subjected to ring closure to produce the carboxyfluorans which are esterified with alkyl halides or dialkyl sulfates.

REFERENCES:
patent: 3501331 (1970-03-01), Kimura et al.
patent: 3669711 (1972-06-01), Kimura et al.
patent: 3825432 (1974-07-01), Futaki et al.
patent: 3825561 (1974-07-01), Akamatsu et al.
patent: 3873573 (1975-03-01), Farber et al.
patent: 3929831 (1975-12-01), Garner et al.
patent: 4104437 (1978-08-01), Vincent et al.

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