Hoechst Celanese Corporation

Agfa-gevaert Ag

Hoechst Aktiengesellschaft

American Hoechst Corporation

Bayer Corporation

Hoeschst Aktiengesellschaft

Stephan J Platzer

Karin Maerz

Gabor I Koletar

Gerhard Buhr

Dieter Mohr

Wojciech A Wilczak

Stanley F Wanat

Richard L Shadrach

Andrea Buchmann

David L Siegfried

Hans Heist

Rudolf Neubauer

Manfred Hilger

Ine Gramm

Martin Stork

Thomas A Dunder

Arthur E Procter

Walter Mackert

Mehmet U Yener

Werner Frass

Guenter Hultzsch

Willi-Kurt Gries

Detlev Seip

Volker Matz

Manfred Michel

Siegfried Nuernberger

Timothy T Hannigan

Arthur E Proctor

The mechanical roughening of the surface of a printing plate substrate comprising aluminum or an aluminum alloy is carried out by wet brushing with the use of a cylinder brush 1 in which brush rows 2, 3 having bundles of organic fibers 22 and metal wires 33 are arranged side by side on the surface 7. The suspension used for the wet brushing contains from 5 to 80% by weight of abrasive particles in water.

Process for the mechanical roughening of the surface of a printing plate

This invention relates to negative working color proofing sheet constructions which, upon exposure to an actinic radiation source through a screened image, can accurately reproduce said image. The construction is useful as a color proofing film which can be employed to accurately predict the image quality from a lithographic printing process. The image is produced by forming a composite of a receiver sheet, an adhesive layer, a color layer and cover sheet. Upon imagewise exposure, a negative image appears on the receiver base after dry peel apart development.

Negative working, peel developable, single sheet color proofing system

A photosensitive material for the production of color proofing films for multicolor printing, having

Process for the production of a multicolored image and photosensitive

This invention provides an improved negative-working or positive-working, single sheet color proofing method which can accurately reproduce images by using colored, photosensitive layers on substrates which are then overcoated with partially developable adhesive layers. The final construction is useful in predicting the image quality from a lithographic printing process. The partial removal of the adhesive layers cleans out any background stain which may remain from the incomplete removal of the photosensitive layer.

Solid transfer negative- or positive-working color proofing element

A process for the production of a lithographic printing plate is described, in which a photosensitive material comprising a substrate suitable for lithographic printing, a hydrophilic intermediate layer, a photopolymerizable layer which changes its adhesion to the hydrophilic layer and/or to the cover sheet on exposure to light and a transparent cover sheet provided with an exposure mask which is non-transparent to actinic light is exposed to actinic light through the exposure mask, and the photopolymerizable layer is developed to give the image by peeling off the cover sheet from the substrate. The process is carried out in all stages without the use of chemicals and gives printing plates having good oleophilic properties and a long press life.

Process for the production of a lithographic printing plate through

A light-sensitive material for producing color-test films for multi-color printing is disclosed. The material has (A) a transparent flexible base film of a plastic, (B) a photopolymerizable layer containing (B1) a polymeric binder, (B2) a compound polymerizable by a free-radical mechanism, (B3) a compound capable of initiating the polymerization of (B2) under the action of actinic light, and (B4) a dye or a colored pigment in one of the basic colors of multi-color printing, and (C) a thermoplastic adhesion layer on the light-sensitive layer is described. A polymer of a vinyl alkyl ether is present in at least one of the layers (B) and (C). The material is processed by lamination to an image-receiving material, with subsequent exposure and peeling-apart of base film and image-receiving material. The unexposed layer areas remain together with the adhesion layer on the image-receiving material. These steps are repeated with at least one further part-color image. The material gives improved image resolution and has improved storage stability in the unexposed state.

Light-sensitive material for producing a multi-color image

The invention relates to a photosensitive material for the production of color proofing films for multicolor printing comprising:

Process for the production of a multicolored image

Method of producing an image using a negative working, peel developable,

A photosensitive material comprising (A) a flexible transparent film support, (B) a colored photosensitive layer which contains an organic binder (B1) a dye or a colored pigment (B2), a compound (B3), which forms a strong acid on exposure to radiation, and a compound (B4) which has at least one group cleavable by the acid, and (C) an adhesion-promoting layer which contains a thermoplastic polymer which has a softening temperature in the range from 40.degree. to 200.degree. C., wherein the adhesion (a.sub.1) of the unexposed photosensitive layer (B) to the adhesion-promoting layer (C) is less than the adhesion (a.sub.3) of the unexposed photosensitive layer (B) to the film support (A) and than the cohesions of the layers (B) and (C), and the adhesion (a.sub.3 ') of the exposed photosensitive layer (B) to the film support (A) is less than the adhesion (a.sub.1 ') of the exposed photosensitive layer (B) to the adhesion-promoting layer (C) and than the cohesions of the adhesion-promoting layer (C) and of the exposed photosensitive layer (B) is useful for the production of a colored image, in particular, is useful in a color proofing method for multicolor printing, which process gives images having high resolution.

Peel-apart process for the production of a colored image and imaged

Photosensitive material for the production of a multicolored image

Photosensitive material for the production of a colored image utilizing

A photosensitive material for making color-proofing films for multicolor printing is described, with

Photosensitive material and method for making color-proofing films

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Califon, NJ, United States of America

Stephan J Platzer