Chromogenic copy system

Claim 2

A pressure-sensitive chromogenic copy system comprising a transfer sheet having on at least a portion of at least one surface thereof a color developer capable of reacting with a chromogen to form a color image, said color developer comprising a compound having the general formula: ##STR2## wherein R and R' is each a hydrogen atom, a C 1 -C 20 alkyl radical, or an aryl group, X is hydrogen or a metallic ion, Σ is a sulfur atom, or a sulfonyl or sulfone radical, n is 0 or an integer of 1 to 20, and m is an integer of 1 to 20.

Claim 3

The pressure-sensitive chromogenic copy system of claim 1 wherein the color developer has the general formula: ##STR3## wherein R is a hydrogen atom or a methyl radical, X is hydrogen or a metallic ion, and Σ-R is an isobutyl thio or butyl thio radical.

Claim 4

The pressure-sensitive chromogenic copy system of claims 1 or 2 wherein the color developer is selected from 2-hydroxy-4-methyl-5-butyl thiobenzoic acid; 2-hydroxy-5-isobutyl thiobenzoic acid; the metallic salts thereof; or mixtures thereof.

Claim 5

A receptor sheet for a pressure-sensitive chromogenic copy system comprising a substrate having on at least a portion of one surface thereof a color developer capable of reacting with a chromogen to form color images, said color developer comprising a compound having the general formula: ##STR4## wherein R and R' is each a hydrogen atom, a C 1 -C 20 alkyl radical, or an aryl group, X is hydrogen or a metallic ion, Σ is a sulfur atom, or a sulfonyl or sulfone radical, n is 0 or an integer of 1 to 20, and m is an integer of 1 to 20.

Claim 6

A receptor sheet for a pressure-sensitive chromogenic copy system comprising a substrate having on at least a portion of one surface thereof a color developer capable of reacting with a chromogen to form color images, said color developer comprising a compound having the general formula: ##STR4## wherein R and R' is each a hydrogen atom, a C 1 -C 20 alkyl radical, or an aryl group, X is hydrogen or a metallic ion, Σ is a sulfur atom, or a sulfonyl or sulfone radical, n is 0 or an integer of 1 to 20, and m is an integer of 1 to 20.

Claim 7

The receptor sheet of claim 4 wherein the color developer has the general formula: ##STR5## wherein R is a hydrogen atom or a methyl radical, X is hydrogen or a metallic ion, and Σ-R is an isobutyl thio or butyl thio radical.

Claim 8

The receptor sheet of claims 4 or 5 wherein the color developer is selected from 2-hydroxy-4-methyl-5-butyl thiobenzoic acid; 2-hydroxy-5-isobutyl thiobenzoic acid; the metallic salts thereof; or mixtures thereof.

Claim 9

A coated front and back sheet for a pressure-sensitive chromogenic copy system comprising a substrate having on at least a portion of one surface thereof a coating of chromogen-containing microcapsules and on at least a portion of the other surface thereof a coating of a color developer capable of reacting with said chromogen to form color images, said color developer comprising a compound having the general formula: ##STR6## wherein R and R' is each a hydrogen atom, a C 1 -C 20 alkyl radical, or an aryl group, X is hydrogen or a metallic ion, Σ is a sulfur atom, or a sulfonyl or sulfone radical, n is 0 or an integer of 1 to 20, and m is an integer of 1 to 20.

Claim 10

A coated front and back sheet for a pressure-sensitive chromogenic copy system comprising a substrate having on at least a portion of one surface thereof a coating of chromogen-containing microcapsules and on at least a portion of the other surface thereof a coating of a color developer capable of reacting with said chromogen to form color images, said color developer comprising a compound having the general formula: ##STR6## wherein R and R' is each a hydrogen atom, a C 1 -C 20 alkyl radical, or an aryl group, X is hydrogen or a metallic ion, Σ is a sulfur atom, or a sulfonyl or sulfone radical, n is 0 or an integer of 1 to 20, and m is an integer of 1 to 20.

Claim 11

The coated front and back sheet of claim 7 wherein the color developer has the general formula: ##STR7## wherein R is a hydrogen atom or a methyl radical, X is hydrogen or a metallic ion, and Σ-R is an isobutyl thio or butyl thio radical.

Claim 12

The coated front and back sheet of claims 7 or 8 wherein the color developer is selected from 2-hydroxy-4-methyl-5-isobutyl thiobenzoic acid; the metallic salts thereof; or mixtures thereof.