Thermally-responsive record material

Details Thermally-responsive record material Thermally-responsive record material

1979-04-09

1981-01-20

Hess, Bruce H.

Stock material or miscellaneous articles

Composite

282 275, 427151, 427153, 428323, 428500, 428532, 428535, 428913, B41M 518

Patent

active

042463181

ABSTRACT:
A thermally sensitive record material is disclosed which comprises chromogenic material which is a mixture of the isomers 7-(1-ethyl-2-methylindol-3-yl)-7-(4-dimethylamino-2-ethoxyphenyl)-5,7-dihy drofuro[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. This record material has superior color forming efficiency and greater image stability, especially resistance to fading in incident light.

REFERENCES:
patent: 3451338 (1969-06-01), Baum
patent: 3539375 (1970-11-01), Baum
patent: 3674535 (1972-07-01), Blose et al.
patent: 3775424 (1973-11-01), Farber
patent: 3853869 (1974-12-01), Farber

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