Polychrome Corporation

James Shelnut

Alan Leonard Wilkes

Ken-ichi Shimazu

Eugene Golda

Jen-chi Huang

Thomas J Dooley

Richard J Cohen

Jerome Kesselman

The invention features a lithographic composition fabricated from a process wherein an acidic novolak resin is neutralized in solution. The solution comprises a common compatible solvent with the other ingredients of the coating composition, such as a positive sensitizer, a color changing dye, and a light activated, acid-releasing compound.

Method for neutralizing acidic novolak resin in a lithographic coating

A non-silver, positive-working, essentially alkali-insoluble, radiation-sensitive composition, which becomes alkali-soluble on exposure to radiation, comprising a non-silver, positive-acting, essentially alkali-insoluble radiation-sensitive component a radiation absorbing component and an essentially alkali-soluble polymeric binder. A radiation-sensitive element comprising a transparent substrate overcoated with said radiation-sensitive composition. A duplicating film comprising the said element prepared by exposing said composition through the substrate and then image-wise exposing said composition through a mask in front of the composition followed by treatment with an alkaline developer to remove those areas of the composition subjected to both exposures.

Duplicating film mask with radiation absorbing benzophenone in processed

A planographic printing plate comprises an anodized metal substrate, an interlayer on the substrate and a photosensitive layer on the interlayer in which the interlayer is a hydroxy-substituted organic acid.

Acid interlayered planographic printing plate

A colored, positive-acting, radiation-sensitive composition whose color is extinguished or greatly decreased in intensity upon irradiation comprising at least one acid-free resin, at least one component which upon irradiation yields acidic and/or free radical products, at least one acid and/or free radical sensitive dyestuff and at least one positive-acting component; positive-acting elements comprising suitable support materials at least one surface of which has been coated with the above composition and lithographic printing plates comprising the above elements, wherein the support materials are lithographically suitable support materials, whch have been imagewise exposed to radiation whereby there is a high contrast, before development, between the colored image areas and less intensely colored or colorless non-image areas, the image areas of said plates being additionally highly stable against aqueous alkaline developers after development to remove the exposed non-image areas of the composition and more highly colored than the non-image areas of the revealed substrate surface.

Positive acting composition yielding pre-development high visibility

A colored, positive-acting, radiation-sensitive composition whose color is extinguished or greatly decreased in intensity upon irradiation comprising at least one acid-free resin, at least one acid-sensitive dyestuff and at least one positive-acting component which yields an acidic product upon irradiation; positive-acting elements comprising suitable support materials at least one surface of which has been coated with the above composition and lithographic printing plates comprising the above elements, wherein the support materials are lithographically suitable support materials, which have been imagewise exposed to radiation wherein there is a high contrast, before development, between the colored image areas and less intensely colored or colorless non-image areas, the image areas of said plates being additionally highly stable against aqueous alkaline developers after development to remove the exposed non-image areas of the composition and more highly colored than the non-image areas of the revealed substrate surface.

Growing community of inventors

Carmel, NY, United States of America

James Shelnut