Dye solvents for pressure-sensitive copying systems

Claim 2

A pressure-sensitive recording system comprising (a) supporting sheet material, (b) mark forming components arranged in contiguous juxtaposition and supported by said sheet material, said components comprising a chromogenic material held within microcapsules and an electron accepting material of the Lewis acid type reactive with said chromogenic material to produce a mark when brought into reactive contact, and (c) a pressure releasable solvent for said chromogenic mark forming component, said solvent comprising an aryl ester represented by the structure ##STR5## wherein R 1 is hydrogen, methyl or ethyl; R 2 is hydrogen or C 1 to C 9 alkyl; R 3 is hydrogen, methyl or ethyl; and n is zero or 1.

Claim 3

A system of claim 1 wherein the electron accepting material of the Lewis acid type is selected from the group consisting of acidic clay and acidic organic polymers.

Claim 4

A system of claim 1 wherein the chromogenic material is dissolved in the solvent prior to bringing said chromogenic material and said electron accepting material into reactive contact.

Claim 5

A system of claim 1 wherein the mark forming components and the solvent are present on a single support paper sheet.

Claim 6

A system of claim 1 wherein the chromogenic material comprises a phthalide compound.

Claim 7

A system of claim 2 wherein the electron accepting material of the Lewis acid type is a phenolic polymer.

Claim 8

A system of claim 1 wherein R 1 is hydrogen; R 2 is methyl, ethyl or t-butyl; R 3 is hydrogen; and n is a 1.

Claim 9

A system of claim 1 wherein the solvent is represented by the structure ##STR6##

Claim 10

A pressure-sensitive recording system comprising (a) a first support sheet having disposed thereon a coating of a pressure releasable marking fluid held within microcapsules, and (b) A second supporting sheet having disposed thereon a coating of an electron accepting material of the Lewis acid type arranged in contiguous juxtaposition with the coating on said first supporting sheet, said marking fluid comprising a solvent and a colorless or substantially colorless chromogenic material dissolved therein, said chromogenic material being reactive with said Lewis acid type material to produce a colored mark and said solvent comprising an aryl ester represented by the structure ##STR7## wherein R 1 is hydrogen, methyl or ethyl, R 2 is hydrogen or C 1 to C 9 alkyl; R 3 is hydrogen, methyl or ethyl; and n is zero or 1.

Claim 11

A pressure-sensitive recording system comprising (a) a first support sheet having disposed thereon a coating of a pressure releasable marking fluid held within microcapsules, and (b) A second supporting sheet having disposed thereon a coating of an electron accepting material of the Lewis acid type arranged in contiguous juxtaposition with the coating on said first supporting sheet, said marking fluid comprising a solvent and a colorless or substantially colorless chromogenic material dissolved therein, said chromogenic material being reactive with said Lewis acid type material to produce a colored mark and said solvent comprising an aryl ester represented by the structure ##STR7## wherein R 1 is hydrogen, methyl or ethyl, R 2 is hydrogen or C 1 to C 9 alkyl; R 3 is hydrogen, methyl or ethyl; and n is zero or 1.

Claim 12

A system of claim 9 wherein R 1 is hydrogen; R 2 is methyl, ethyl or t-butyl; R 3 is hydrogen, and n is 1.

Claim 13

A system of claim 9 wherein the chromogenic material comprises a phthalide compound.

Claim 14

A system of claim 9 wherein the electron accepting material of the Lewis acid type is a phenolic polymer.

Claim 15

A system of claim 9 wherein the solvent is benzyl benzoate.