Pressure-sensitive copying paper containing lactone compounds de

Details Pressure-sensitive copying paper containing lactone compounds de Pressure-sensitive copying paper containing lactone compounds de

1974-03-25

1976-01-06

Willis, Jr., P. E.

Textiles: manufacturing

427151, 427152, 428323, 428411, 260295, 260335, B41M 512, B41M 516, B41M 522

Patent

active

039306720

ABSTRACT:
A pressure-sensitive copying paper comprising an adsorbent solid acid and a microencapsulated color former capable of forming a distinct color when reacted with the adsorbent acid coated on the same or a different surface of a support or supports, the microencapsulated color former being at least one lactone compound derived from a pyridine-carboxylic acid represented by the formula ##SPC1##
Or a mixture thereof, wherein R.sub.1, R.sub.2, R.sub.3 and the partial structure ##SPC2##
Are as defined hereinafter, is disclosed.

REFERENCES:
patent: 3669710 (1972-06-01), Kimura et al.
patent: 3725416 (1973-04-01), Yamamoto et al.
patent: 3730754 (1973-05-01), Farber et al.
patent: 3775424 (1973-11-01), Farber
patent: 3787325 (1974-01-01), Hoover

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