Coating processes – Transfer or copy sheet making – Reactive components
Patent
1992-07-27
1994-08-23
Bell, Janyce
Coating processes
Transfer or copy sheet making
Reactive components
427152, 427209, B41M 312
Patent
active
053406060
ABSTRACT:
A method of optically reading colored record images formed by the reaction of a substantially colorless electron donating dye and an electron accepting developer in a pressure-sensitive recording sheet with a red light having a wavelength of from 620 nm to 700 nm, wherein the pressure-sensitive recording sheet comprises an electron accepting developer layer containing a metal salt of an aromatic carboxylic acid as the electron accepting developer and an electron donating dye layer containing a phthalide compound represented by the following formula (1) as the electron donating dye: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4 each represents a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, or a substituted or unsubstituted aryl group; the R.sub.1 and R.sub.2 or the R.sub.3 and R.sub.4 may combine with each other to form a ring; R.sub.5 represents a hydrogen atom or an alkyl group; R6, R.sub.7, R.sub.8, and R.sub.9 each represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, a substituted amino group, or an alicyclic amino group; and X and Y each represents a hydrogen atom, an alkyl group, or an alkoxy group.
REFERENCES:
patent: 4820550 (1989-04-01), Naoki et al.
patent: 4822768 (1989-04-01), Ohga et al.
patent: 4835133 (1989-05-01), Yanagihara et al.
patent: 4849397 (1989-07-01), Sano et al.
patent: 4855282 (1989-08-01), Satomura et al.
Iwakura Ken
Sano Shojiro
Bell Janyce
Fuji Photo Film Co. , Ltd.
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