Diphenylphthalide duplicating and marking systems

Details Diphenylphthalide duplicating and marking systems Diphenylphthalide duplicating and marking systems

1979-03-28

1980-09-02

Hess, Bruce H.

Textiles: manufacturing

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

Patent

active

042203570

ABSTRACT:
Substituted 3,3-diphenylphthalides, useful as color precursors, particularly in the art of pressure-sensitive duplicating systems and heat-sensitive marking systems, are prepared by condensing substituted 2-benzoylbenzoic acids with substituted anilines.

REFERENCES:
patent: 3944570 (1976-03-01), Houlihan et al.

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