Heat-sensitive recording sheets having improved stability

Details Heat-sensitive recording sheets having improved stability Heat-sensitive recording sheets having improved stability

1973-09-04

1976-02-10

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Composite

427150, 427151, 428488, B41M 500

Patent

active

039378640

ABSTRACT:
Heat-sensitive recording sheets having an improved stability comprising a colorless or pale-colored chromogenic compound and an organic acid for coloring the chromogenic compound by heating, which are characterized by containing phenol derivatives represented by the formula ##SPC1##
Wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are hereinafter defined, is disclosed.

REFERENCES:
patent: 3244550 (1966-04-01), Farnham et al.
patent: 3451338 (1969-06-01), Baum
patent: 3539375 (1970-11-01), Baum

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