Image production using photosensitive compositions of nitrone which is heat developed

Claim 2

The process of claim 1, in which each of the R and R'' groups of the nitrone is selected from the group consisting of phenyl and 1-naphthyl.

Claim 3

The process of claim 1, in which said photosensitive nitrone is alpha,N-diphenylnitrone.

Claim 4

The process of claim 1, in which said heat-treating is carried out at a temperature approximating 135*C.

Claim 5

Process for producing a visible image comprising: exposing to actinic radiation at least a portion of a photo-sensitive medium carrying (1) a photosensitive nitrone having the formula RCH N( -> O)R'' wherein R is selected from the group consisting of aryl including substituted phenyl, aroyl, arylvinylene and furyl groups and R'' is an aryl group including substituted phenyl, said substituted phenyl having one or two substituents selected from the group consisting of dimethylamino, hydroxy, methoxy, methyl and nitro, and (2) an intensifier compound selected from the group consisting of diphenylamine, p-phenylenediamine, N,N''-diphenyl-p-phenylenediamine, indole, 3-indolylacetic acid, carbazole, benzimidazole, rhodanine and p-methoxyphenol to convert said nitrone to a product giving increased optical densities in the exposed areas of said medium and heat-treating said medium at a temperature of at least 100*C for a period of time sufficient to convert said nitrone in unexposed image areas to a radiation-stable product of low optical density.

Claim 6

The process of claim 6, in which each of the R and R'' groups of the nitrone is selected from the group consisting of phenyl and 1-naphthyl.

Claim 7

The process of claim 7, in which the intensifier compound is N,N''-diphenyl-p-phenylenediamine.

Claim 8

The process of claim 6, in which the intensifier compound is diphenylamine.

Claim 9

The process of claim 6, in which the intensifier compound is N,N''-diphenyl-p-phenylenediamine.

Claim 10

The process of claim 6, in which the intensifier compound is p-methoxyphenol.

Claim 11

The process of claim 6, in which said photosensitive nitrone is alpha,N-diphenylnitrone and said intensifier is the compound N,N''-diphenyl-p-phenylenediamine.

Claim 12

Process for producing a visible image comprising: exposing to actinic radiation at least a portion of a photosensitive medium carrying (1) a photosensitive nitrone having the formula RCH N( -> O)R'' wherein R is selected from the group consisting of aryl including substituted phenyl, aroyl, arylvinylene and furyl groups and R'' is an aryl group including substituted phenyl, said substituted phenyl having one or two substituents selected from the group consisting of dimethylamino, hydroxy, methoxy, methyl and nitro, and (2) a heat-fixing catalyst selected from the group consisting of tricresyl phosphate, phosphorus trichloride, phosphorus pentachloride, sulfur dioxide, thionyl chloride, acetic anhydride and maleic anhydride to convert said nitrone to a product giving increased optical densities in the exposed image areas of said medium and heat-treating said medium at a temperature of at least 100*C for a period of time sufficient to convert said nitrone in unexposed image areas to a radiation-stable product of low optical density.

Claim 13

The process of claim 13, in which each of the R and R'' groups of the nitrone is selected from the group consisting of phenyl and 1-naphthyl.

Claim 14

The process of claim 14, in which the heat-fixing catalyst is tricresyl phosphate.

Claim 15

The process of claim 13, in which the heat-fixing catalyst is tricresyl phosphate.

Claim 16

The process of claim 13, in which said photosensitive nitrone is alpha,N-diphenylnitrone and said heat-fixing catalyst is tricresyl phosphate.

Claim 17

Process for producing a visible image comprising: exposing to actinic radiation at least a portion of a photosensitive medium carrying (1) a photosensitive nitrone having the formula RCH N( -> O)R'' wherein R is selected from the group consisting of aryl including substituted phenyl, aroyl, arylvinylene and furyl groups and R'' is an aryl group including substituted phenyl, said substituted phenyl having one or two substituents selected from the group consisting of dimethylamino, hydroxy, methoxy, methyl and nitro, (2) an unsaturated compound selected from the group consisting of (a) the lower alkyl esters of acrylic acid, methyl-substituted acrylic acid and fumaric acid and the nitriles corresponding to said acids; (b) N-phenylamides, N-lower-alkylamides and N-lower-hydroxyalkyl amides of acrylic acid and methyl-substituted acrylic acid; (c) N-vinyl succinimide and N-vinyl phthalimide; (d) styrene and phenylacetylene and (e) 3-sulfolene and (3) reaction products of said nitrone and said unsaturated compound to convert said nitrone to a product giving increased optical densities in the exposed image areas of said medium and heat-treating said medium at a temperature of at least 100*C for a period of time sufficient to convert said nitrone in unexposed image areas to a radiation-stable product of low optical density.

Claim 18

The process of claim 18, in which said unsaturated compound is selected from the group consisting of acrylonitrile, fumaronitrile, dimethyl fumarate, acrylamide, N-phenylacrylamide, N,N''-methylenebisacrylamide, N-methylolacrylamide, N-methylolmethacrylamide, N-vinylsuccinimide, N-vinylphthalimide, styrene, phenylacetylene, and 3-sulfolene.

Claim 19

The process of claim 19, in which said photosensitive medium carries additionally a salt selected from the group consisting of lithium bromide, lithium p-toluenesulfonate, and piperidinium p-toluenesulfonate for increasing the reactivity of said unsaturated compound during said heat-treating to provide a radiation-stable reaction product of unexposed nitrone and said unsaturated compound.

Claim 20

The process of claim 19, in which said photosensitive medium carries additionally an intensifier, for further increasing optical density responsive to said conversion of the nitrone in the exposed image areas, in the form of a compound selected from the group consisting of diphenylamine, p-phenylenediamine, N,N''-diphenyl-p-phenylenediamine, indole, 3-indolylacetic acid, carbazole, benzimidazole, rhodanine, and p-methoxyphenol.

Claim 21

The process of claim 18, in which each of the R and R'' groups of the nitrone carried by said medium is selected from the group consisting of phenyl and 1-naphthyl, and in which said photosensitive medium carries N-methylolmethacrylamide for facilitating the production, during said heat-treating, of said low-optical-density radiation-stable product in unexposed image areas which includes a reaction product of the unexposed nitrone and the N-methylolmethacrylamide.

Claim 22

The process of claim 22, in which said photosensitive medium carries additionally piperidinium p-toluene-sulfonate for increasing the reactivity of the N-methylolmethacrylamide with the nitrone in unexposed image areas during said heat-treating.

Claim 23

The process of claim 22, in which said photosensitive medium carries additionally N,N''-diphenyl-p-phenylenediamine for further increasing optical density responsive to said conversion of the nitrone in the exposed image areas.

Claim 24

The process of claim 22, in which said photosensitive medium carries additionally diphenylamine for further increasing optical density responsive to said conversion of the nitrone in the exposed image areas.