Low-odor 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 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 a composition selected from the group consisting of: (i) (a) at least about 70 percent by weight of: ##STR9## (b) from about 10 to about 25 percent by weight of: ##STR10## (c) from 0 to about 6 percent by weight of: ##STR11## (ii) (a) at least about 65 percent by weight of: ##STR12## (b) from about 15 to about 30 percent by weight of: ##STR13## (c) from 0 to about 8 percent by weight of: ##STR14## and (iii) isomeric or physical mixtures of (i) and (ii).

Claim 3

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 4

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

Claim 5

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

Claim 6

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 7

A system of claim 5 wherein the electron accepting material of the Lewis acid type is a phenolic polymer.

Claim 8

A system of claim 1 wherein the solvent composition comprises: (a) from about 75 to about 85 percent by weight of: ##STR15## (b) from about 15 to about 22 percent by weight of: ##STR16## (c) from 0 to about 5 percent by weight of: ##STR17##

Claim 9

A system of claim 7 wherein the solvent composition contains a diluent which is a mono-C 10 to C 15 -alkylbenzene mixture.

Claim 10

A pressure-sensitive recording system comprising (A) a first support sheet having disposed thereon a coating of a pressure releasable marking fluid, 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 a composition selected from the group consisting of: (i) (a) at least about 70 percent by weight of: ##STR18## (b) from about 10 to about 25 percent by weight of: ##STR19## (c) from 0 to about 6 percent by weight of: ##STR20## (ii) (a) at least about 65 percent by weight of: ##STR21## (b) from about 15 to about 30 percent by weight of: ##STR22## (c) from 0 to about 8 percent by weight of: ##STR23## and (iii) isomeric or physical mixtures of (i) and (ii).

Claim 11

A pressure-sensitive recording system comprising (A) a first support sheet having disposed thereon a coating of a pressure releasable marking fluid, 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 a composition selected from the group consisting of: (i) (a) at least about 70 percent by weight of: ##STR18## (b) from about 10 to about 25 percent by weight of: ##STR19## (c) from 0 to about 6 percent by weight of: ##STR20## (ii) (a) at least about 65 percent by weight of: ##STR21## (b) from about 15 to about 30 percent by weight of: ##STR22## (c) from 0 to about 8 percent by weight of: ##STR23## and (iii) isomeric or physical mixtures of (i) and (ii).

Claim 12

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

Claim 13

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

Claim 14

A system of claim 9 wherein the solvent composition comprises: (a) from about 75 to about 85 percent by weight of: ##STR24## (b) from about 15 to about 22 percent by weight of: ##STR25## (c) from 0 to about 5 percent by weight of: ##STR26##