Pressure-sensitive record material
AssigneeNCR Corporation
InventorErland C. Porter, Jr.
Life of this patent
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Abstract
Record material comprising paper sheet material coated with liquid-containing microcapsules wherein the liquid contents comprise ethyldiphenylmethane. Said liquid is associated on the record material with at least two color-producing reactants, at least one of which is soluble in said liquid. The encapsulated liquid is associated with the reactants by either being in close proximity to both reactants or by having one of the reactants dissolved therein and being in close proximity to the other. Of the color-producing reactants, one is a chromogenic dye-precursor and one is a coreactant material capable of developing the color of the chromogenic dye-precursor when the two reactants are brought into reaction contact by rupture of the capsule walls that contain said liquid.
Claims3
Record sheet material comprising paper coated with microcapsules containing droplets of an oil solution of base-reacting colorless chromogenic dye-precursor material wherein said oil comprises a mixture of at least about 70 percent, by weight, ethyldiphenylmethane, not more than about 25 percent, by weight, dibenzylethylbenzene and not more than about 7 percent, by weight, polybenzylethylbenzene, and a diluent selected from the group consisting of a high-boiling saturated aliphatic hydrocarbon oil in an amount up to about one-third of the total weight of the oil and mono-C.sub.10 to C.sub.15 -alkylbenzene in an amount up to about two-thirds of the total weight of the oil;
- and with an oil-soluble, acid-reacting zinc salt of phenol-formaldehyde novolak resin capable of producing color in said dye-precursors when brought into reactive contact therewith.
Dependencies are inferred from the claim text.