Hoechst Celanese Corporation

American Hoechst Corporation

Bayer Corporation

Other

Agfa Corporation

Major S Dhillon

John E Walls

Carlos Tellechea

Gerhard Sprintschnik

Stanley F Wanat

Shane Hsieh

Gabor I Koletar

Douglas A Seeley

Jose G Gonzales

Trisha Bentley

Allen W Loveland

Dennis A King

A color ant dispersion having a pigment, a solvent composition of a C -C aliphatic alcohol, a mono- or di-C -C alkylene glycol C -C alkyl ether, or a cyclic ketone; and an aqueous alkaline soluble or swellable polymeric compound which is the reaction product of a hydroxy containing polymer and an anhydride in the presence of a catalytic amount of a tertiary amine catalyst. The pigment and the polymeric compound are present in a high relative weight ratio of from about 0.75:1.25 to about 1.25:0.75. An admixture of the dispersion, a light sensitive component diazonium compound or photopolymerizable composition and an aqueous alkaline soluble or swellable polymeric binder, when coated and dried onto a substrate, forms a photographic element, which when imagewise exposed and developed has an exceptionally high contrast between image and removed non-image areas.

Aqueous developable negative acting photosensitive composition having improved image contrast

The present invention relates to supports for lithographic printing plates and to a process for producing the same. In particular, the invention relates to aluminum plates having an electrochemically grained and anodized surface which is has a smooth, shiny surface and hence greater image contrast when a lithographic image is formed thereon. The surface has a substantially uniform surface topography comprising peaks and valleys and surface roughness parameters wherein Ra ranges from about 0.10 to about 0.50 microns, Rz ranges from about 0.00 to about 5.00 microns, Rt ranges from about 0.00 to about 6.00 microns and Rp ranges from about 0.00 to about 4.00 microns. The surface preferably has tristimulus color coordinate values wherein L ranges from about 35.00 to about 75.00, a ranges from about -4.00 to about +4.00 and b ranges from about -4.00 to about +4.00.

Grained and anodized aluminum substrate for lithographic printing plates

Lithographic printing plates having specific grained and anodized

A composition for finishing, preserving and cleaning lithographic printing plates which is composed of a polyol having a molecular weight in the range of from about 50 to about 3,000; a starch or dextrin hydrophilic film former; an alkyl benzene sulfonate amine salt; a composition of hydrocarbons containing less than about 10% aromatics and having a boiling point in the range of 175.degree. F. to 500.degree. F. and a flash point of above 100.degree. F.; a hydrogen, isooctyl, nonyl, decy or dodecyl substituted phenoxypoly(oxyethylene) ethanol surfactant having an HLB of 8 to 15; a C.sub.12 to C.sub.20 alcohol; mono-, di- or tri- ethanolamine; an organic or inorganic acid and water. The optional inclusion of a buffer salt and bacteriostat is preferred.

Finisher-preserver-cleaner composition for lithographic printing plates

Provided herein is a brushgraining process to improve the quality of lithographic printing plate substrate surfaces. In the process, the surface is brushed in an aqueous slurry comprising a mixture of particulates of alumina and quartz in a weight ratio range 95:5 to 5:95, with the particulates being in the size range of 1-20 microns. Such a process surprisingly lessens the number of scratches produced on the substrate surface than when compared to using alumina alone or quartz alone or a mixture of alumina and quartz with particle sizes higher than the range disclosed.

Process for preparing improved lithographic printing plates by

This invention relates to a radiation polymerizable composition for use in a phtographic element such as a lithographic printing plate comprising in admixture

Radiation-polymerizable composition and element containing a

A developer composition which comprises in admixture:

Developer compositions for newspaper plates

This invention relates to a radiation polymerizable composition for use in a photographic element such as a lithographic printing plate comprising in admixture

Radiation polymerizable composition and element containing a

A light-sensitive compound having the formula: ##STR1## wherein R.sub.3 is selected from the group consisting of phenyl and C.sub.1 to C.sub.4 alklyl substituted phenyl.

Three dimensional reproduction material diazonium condensates and use in

A developing and finishing composition for lithographic printing plates containing:

Developer-finisher compositions for lithographic plates

A composition for finishing, preserving and cleaning lithographic printing plates composed of a polyol having a molecular weight in the range of from about 50 to about 2,000; a maltodextrin obtained by the enzyme hydrolysis of corn or potato starch, a mixture of a C.sub.18 to C.sub.30 alcohol and an aminated, aliphatic C.sub.8 to C.sub.24 alcohol sulfate with a ratio of alcohol to sulfate ranging from about 1:1 to about 5:1; and a composition of hydrocarbons having a boiling point in the range of from about 175.degree. F. to about 500.degree. F., and a flash point of above about 100.degree. F., preferably containing 100% aliphatic components; and a substituted phenoxypoly(oxyethylene)ethanol having a hydrophile/lipophile balance of from about 8 to about 15; and a mono-, di- or tri-ethanolamine; and water; and an acid to impart a pH to the composition of from about 2.5 to about 6.5; and a buffer to maintain the pH, and preferably a bacteriostat/fungistat component.

Enzyme hydrolyzed maltodextrin containing finisher/preserver/cleaner

Method of using developer-finisher compositions for lithographic plates

A developer composition for heavy duty printing plates which comprises in admixture:

Developer compositions for heavy-duty lithographic printing plates

A process for the production of photographic images utilizing a photographic element comprising a transparent support and a coating on the support comprising a diazonium composition having a light absorbency of about 45% or less, and a colorant composition, said coating having a light transmission of not more than about 0.1%.

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Belle Mead, NJ, United States of America

Major S Dhillon