Pressure-sensitive record material

Details Pressure-sensitive record material Pressure-sensitive record material

1979-06-05

1981-11-10

Hess, Bruce H.

Textiles: manufacturing

8636, 8637, 8657, 106 21, 427151, 427212, 427220, 428307, 428323, 428403, 428537, 428914, B32B 516, B41M 516, B41M 522, C09D 1100

Patent

active

042994110

ABSTRACT:
A pressure-sensitive record material comprising the colorless chromogenic dye Pyridyl Blue mixed with and adsorbed onto a pigment which is coated on a substrate sheet, and capsules containing an acidic resin dissolved in a suitable solvent, the capsules being coated on the same or an additional sheet. This "reverse" system (where the acidic resin rather than the dye is encapsulated) provides an improved community of properties, including improved image strength, print stability (fade resistance) and resistance to degradation. Pyridyl Blue is a mixture of the isomers 7-(1-ethyl-2-methylindol-3-yl)-7-(4-diethylamino-2-ethoxyphenyl)-5,7-dihyd rofuro[3,4-b]pyridin-5-one and 5-(1-ethyl-2-methylindol-3-yl)-5-(4-diethylamino-2-ethoxyphenyl)-5,7-dihyd rofuro[3,4-b]pyridin-7-one.

REFERENCES:
patent: 3672935 (1972-06-01), Miller et al.
patent: 3775424 (1973-11-01), Farber
patent: 3853869 (1974-12-01), Farber
patent: 3894168 (1975-07-01), Brockett et al.
patent: 3911195 (1975-10-01), Schmidt et al.

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