Spontaneously color changing type thermal sensitive recording me

Details Spontaneously color changing type thermal sensitive recording me Spontaneously color changing type thermal sensitive recording me

1998-08-18

2000-07-25

Hess, Bruce H.

Record receiver having plural interactive leaves or a colorless

Having a colorless color-former, developer therefor, or...

Identified organic electron acceptor other than phenolic resin

427150, 427151, 503216, 503224, B41M 530

Patent

active

060936789

ABSTRACT:
A thermal sensitive recording medium which has a feature to change the color of recorded pattern slowly and spontaneously after development, and the recorded pattern which has several days passed can be easily distinguished from that of just after development. Said thermal sensitive recording medium contains 4-hydroxybenzoic acid ester represented by general formula (I) as a color developer and uses triphenylmethane-based leuco dye and reddish color developing leuco dye whose maximum absorption wave length is 450.about.560 nm as a dye precursor. ##STR1## In this formula, R represents unsubstituted or substituted lower alkyl group of carbon number 1-7 or benzyl group.

REFERENCES:
patent: 3895173 (1975-07-01), Adachi
patent: 4431706 (1984-02-01), Sato
patent: 5811369 (1998-09-01), Nagai et al.
Abstract of Japanese Laid Open Patent Application Publication No.59-33183 (Feb. 22, 1984).
Abstract of Japanese Patent Publication No. 45-14039 (Jul. 19, 1970).
Abstract of Japanese Laid-Open Patent Appln. Pub. No. 2-258286 (Oct. 19, 1990).
Abstract of Japanese Laid-Open Patent Appln. Publ. No. 3-65383 (Mar. 20, 1991).
Abstract of Japanese Laid-Open Patent Appln. Pub. No. 52-140483 (Nov. 24, 1977).

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