Pressure-sensitive copy systems containing phenolic ester as color-stabilizers
 Pressure-sensitive material for use in a copy system comprising a substrate bearing isolated droplets, e.g., in microcapsules, of an oily solvent are provided with an acid-sensitive chromogenic compound and a phenolic ester, said phenolic ester being an oil soluble compound that is capable of stabilizing the colored marking. Upon release of the chromogen and the phenolic ester from the microcapsules or the like, the ester is hydrolyzed in the presence of moisture and an acidic material to form the corresponding phenol, which in turn, stabilizes the colored marking. In such form, the phenolic compound will not prematurely react with the chromogen, and it is shielded from any chemical reaction with materials in other parts of the copy system. 
Champion International Corporation
B Y
B41M Y10S
inventional additional
Cheng H.
Chang