Ultra high speed presensitized lithographic plates

Claim 2

An ultra high speed presensitized lithographic plate comprising: a backing member including a substrate surface exhibiting a propensity for adhesion of diazonium materials thereto; and a photosensitive negative-working diazonium material selected from the group consisting of a diazonium compound and a diazonium resin layer adhered to said substrate surface, said diazonium material layer being of a residual thickness and having been formed by extraction from an initial diazonium layer coated onto said substrate surface and having more diazonium material than that of said residual thickness diazonium layer, said residual thickness diazonium layer including a quantity of diazonium material sufficient to form a lithographic image on the plate when subjected to ultra high speed exposure conditions, said residual thickness of the diazonium material layer including a quantity of diazonium material of not much greater than about 0.05 mg of diazonium material per square foot of substrate surface.

Claim 3

The ultra high speed plate of claim 1, further including a polymeric substance adhered to said substrate surface, said polymeric substance being pervious to solubilized diazonium material of said diazo material layer.

Claim 4

The ultra high speed plate of claim 1, further including a polymeric substance layer over said diazonium material overlayer.

Claim 5

The ultra high speed plate of claim 1, further including a photopolymeric substance adhered over said substrate surface.

Claim 6

The ultra high speed plate of claim 1, further including a polymeric substance layer adhered to said substrate surface, said polymeric substance layer being of a thickness no greater than about 200 mg per square foot of substrate surface area.

Claim 7

The ultra high speed plate of claim 1, wherein said substrate surface is grained.

Claim 8

The ultra high speed plate of claim 1, further including a stabilizer on said substrate surface, said stabilizer enhancing the shelf life of the ultra high speed plate.

Claim 9

An ultra high speed presensitized lithographic plate comprising: a backing member including a substrate surface exhibiting adhesion for diazonium materials; and a layer of photosensitive negative-working diazonium material selected from the group consisting of a diazonium compound and a diazonium resin adhered to said substrate surface, said diazonium material layer having been formed by the process including: selecting a plate having a diazonium material adhered thereto; and a treating procedure including contacting said diazonium layered substrate surface with an extracting agent composition, said extracting agent composition being one in which said diazonium material is highly soluble and being a composition that does not significantly solubilize, soften, damage, swell or otherwise adversely affect said presensitized plate, said treating procedure including applying said extracting agent composition to said substrate surface for a length of time sufficient to solubilize and extract into said extracting agent composition substantially all of said diazonium material from said diazonium material layer, and thereafter removing from the plate a substantial amount of said extracting agent composition into which said diazonium material has been extracted, whereby the quantity of said diazonium material in said diazonium layer is sufficient to form a lithographic image on the plate, said quantity of diazonium material being not much greater than about 0.05 mg of diazonium material per square foot of substrate surface.

Claim 10

An ultra high speed presensitized lithographic plate comprising: a backing member including a substrate surface exhibiting adhesion for diazonium materials; and a layer of photosensitive negative-working diazonium material selected from the group consisting of a diazonium compound and a diazonium resin adhered to said substrate surface, said diazonium material layer having been formed by the process including: selecting a plate having a diazonium material adhered thereto; and a treating procedure including contacting said diazonium layered substrate surface with an extracting agent composition, said extracting agent composition being one in which said diazonium material is highly soluble and being a composition that does not significantly solubilize, soften, damage, swell or otherwise adversely affect said presensitized plate, said treating procedure including applying said extracting agent composition to said substrate surface for a length of time sufficient to solubilize and extract into said extracting agent composition substantially all of said diazonium material from said diazonium material layer, and thereafter removing from the plate a substantial amount of said extracting agent composition into which said diazonium material has been extracted, whereby the quantity of said diazonium material in said diazonium layer is sufficient to form a lithographic image on the plate, said quantity of diazonium material being not much greater than about 0.05 mg of diazonium material per square foot of substrate surface.

Claim 11

The ultra high speed plate of claim 8, wherein said treating procedure includes applying said extracting agent by immersing said presensitized plate therewithin, and thereafter scraping said plate for removing a substantial amount of said composition and diazonium material within said extracting agent composition.

Claim 12

The ultra high speed plate of claim 8, wherein said treating procedure includes applying said extracting agent composition for a time period not longer than about 3 minutes.

Claim 13

The ultra high speed plate of claim 8, wherein said treating procedure includes applying said extracting agent composition for a time period between about 5 seconds and about 60 seconds.

Claim 14

The ultra high speed plate of claim 8, wherein said treating procedure includes rinsing said extracting agent composition off of said plate substrate surface.

Claim 15

The ultra high speed plate of claim 12, wherein said treating procedure includes applying a stabilizer to said substrate surface at substantially the same time as said rinsing step.

Claim 16

The ultra high speed plate of claim 8, wherein said treating procedure includes applying a stabilizer to said substrate surface at substantially the same time that said extracting agent composition is applied thereto.

Claim 17

The ultra high speed plate of claim 8, wherein said extracting agent composition is water.

Claim 18

The ultra high speed plate of claim 8, wherein said extracting agent composition is selected from the group consisting of water, tap water, deionized water, distilled water, stabilizers, organic solvents, aqueous blends including a surfactant, aqueous blends including an organic solvent, aqueous blends including acidic, basic or salt additives, and combinations thereof.

Claim 19

The ultra high speed plate of claim 16, wherein said aqueous blends include at least about 30 weight percent water.

Claim 20

The ultra high speed plate of claim 8, wherein said extracting agent composition has a pH between about 1 and about 12.

Claim 21

The ultra high speed plate of claim 8, wherein said extracting agent composition has a pH not greater than about 7.

Claim 22

The ultra high speed plate of claim 2, wherein said polymeric substance includes a dye, a pigment or a photochromic dye.

Claim 23

The ultra high speed plate of claim 3, wherein said polymeric substance includes a dye, a pigment or a photochromic dye.