Abstract: 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.

Abstract: An O-epoxyalklyated tetrakis (hydroxyphenyl) alkane resin or the esterified reaction product of about one equivalent thereof with less than one equivalent of an ethylentically unsaturated organic acid can be combined with an aqueous alkali- and radiation sensitive, negative acting substance which when coated on a substrate forms a radiation sensitive negative working element.

Abstract: An improved anodized support material comprising an anodized support material which has been treated with an alkali metal salt of a condensed aryl sulfonic acid following or during anodization; an improved radiation sensitive element comprising the above improved supports to which has been applied a radiation-sensitive composition and improved lithographic printing plates prepared from said elements.

Abstract: An aqueous composition-sensitive photoconductive composition useful in the preparation of aqueous composition decoatable electrophotographic elements, such elements and low cost lithographic printing plates prepared from said elements the aqueous composition-sensitive photoconductive composition comprising the admixture of an inorganic photoconductor, an organic photoconductor and an aqueous composition-sensitive resin, and, if desired, to increase exposure speed, a dyestuff photosensitizer.

Abstract: In the method of electrolytically treating a lithographic-grade aluminum web by liquid contact in a sulfuric acid electrolyte, the improvement which comprises carrying out said treatment in the presence of an iridium oxide plated titanium metal anode.

Abstract: A method for preparing a substantially uniformily dyed photosensitive composition useful in the reprographic arts, and compositions useful therefor. A water soluble basic dye is reacted with an organic acid, or an ammonium or alkali metal salt thereof which is preferably monofunctional and the reaction product is substantially uniformly dissolved in a photosensitive diazo composition to impart the desired dye color thereto. The resultant dye colored photosensitive composition may then be coated upon a suitable support, for example, a film or metal sheet, to provide a photosensitized product useful in the reprographic arts, which possesses substantially uniform color characteristics and extended shelf life.

Abstract: An improved aqueous alkaline developer for imagewise-exposed positive-acting photolithographic articles comprising a basic substance wherein the improvement comprises addition of a neutral salt of an alkali metal cation to the developer.

Abstract: The disclosure concerns an antibuckling apparatus for a lithographic plate or the like which is being cured in a UV post-curing apparatus. A source of UV radiation irradiates one surface of the plate as the plate is moved through a curing chamber along a predetermined path. An upper antibuckling device comprises a first pair of spaced elongated members which extend across the path of the plate and serve as a support for a plurality of upper antibuckling bars disposed between the radiation source and the upper surface of the plate. The antibuckling bars are disposed generally along the path of the plate but obliquely to the direction of the path, whereby the antibuckling bars do not interfere with irradiation of the entire width of the upper surface of the plate. A similar lower antibuckling device may be disposed beneath the plate on the side thereof not being irradiated.

Abstract: 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 h

Abstract: 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 substr

Abstract: This invention relates to novel photosensitized sheet constructions which, upon exposure to an energy source through a screened image, can accurately and simultaneously reproduce said image in both its negative and positive forms.

Abstract: Photopolymerizable compositions comprised of (I) novel polymers which are substantially comprised of the reaction products of (A) organic polyisocyanates and (B) organic compounds containing at least about two active hydrogen atoms per molecule, said polymers having been end-capped by reaction with (C) organic compounds containing exactly one active hydrogen atoms and said end-capped polymers having viscosities of from about 5 to about 70 stokes when measured as a 30% solution in a mixture of approximately equal parts of xylol, methyl ethyl ketone and ethylene glycol monomethyl ether, at 25.degree. C., (II) addition polymerization initiators activatable by actinic light, (III) addition polymerizable ethylenically unsaturated components capable of forming polymers by photoinitiated polymerization in the presence of the initiators, and (IV) a natural or synthetic rubber.

Abstract: An improved apparatus for developing offset printing plates is disclosed, in which the soaker plates defining the developing chamber between them comprise textured stainless steel and are oriented at an angle to the horizontal, their upstream ends being higher than their downstream ends.

Abstract: An improved lithographic printing plate prepared by exposing a lithographically suitable photosensitive sheet material through a mask or transparency, to radiation, developing the exposed sheet to remove unexposed light sensitive material and post-curing the developed sheet by exposure to high intensity radiation or air-baking at high temperatures.

Abstract: Described is a lithographic element which may optionally be used as a positive working or a negative working element by minor changes in exposure and development parameters.

Abstract: A method for the production of aluminum substrates useful in the production of lithographic printing plates which comprises mechanically graining the surface of an aluminum sheet, subsequently finely graining the mechanically grained sheet in a saturated solution of an aluminum salt of a mineral acid to which up to 10% of a mineral acid has been added, with discretional electrolysis, and then optionally anodizing the sheet.

Abstract: A pressure sensitive adhesive formed by exposure of a mixture comprising (I) a liquid, substantially water-insoluble monomeric composition, containing zero percent free isocyanate groups, which comprises the reaction product of (i) one equivalent of an isocyanate containing intermediate which is, itself, the reaction product of about one equivalent of an organic, monomeric compound containing more than one active hydrogen with two equivalents of an organic polyisocyanate, and (ii) one equivalent of a monomeric olefinically unsaturated compound containing exactly one active group; (II) a tackifier and (III) a polymerization inhibitor to a source of ultraviolet or electron beam radiation whereby the composition is rendered tacky.

Abstract: Storage stable lithographic printing plates employing novel light sensitive, high molecular weight diazo polymers are herein provided. The novel diazo polymers of the instant invention have the generic formula: ##STR1## Where R is methyl or hydrogenX is methoxy, ethoxy or hydrogenY is oxygen or sulfurZ is an anion of a sulfonic, carboxylic or phosphonic acidn is an integer from 8 to 970.

Abstract: Improved compositions comprising solvent-soluble, negative-acting or positive-acting light-sensitive diazonium compounds and solvent-soluble unsaturated monomers which are the products of about two equivalents of an organic diisocyanate with about one equivalent of an active hydrogen-containing organic compound, e.g., an alcohol or amine, preferably a polyol, which products are subsequently reacted with an unsaturated compound which contains an active-hydrogen, preferably in a hydroxyl group, available to react with the remaining isocyanate groups. The compositions can be coated onto suitable base sheet materials to form presensitized lithographic printing plates, proofs for multi-color printing, visual aids, printed circuits and the like.

Abstract: Photopolymerizable compositions comprised of (I) novel polymers which are substantially comprised of the reaction products of (A) organic polyisocyanates and (B) organic compounds containing at least about two active hydrogen atoms per molecule, said polymers having been end-capped by reaction with (C) organic compounds containing exactly one active hydrogen atoms and said end-capped polymers having viscosities of from about 5 to about 70 stokes when measured as a 30% solution in a mixture of approximately equal parts of xylol, methyl ethyl ketone and ethylene glycol monomethyl ether, at 25.degree. C., (II) addition polymerization initiators activatable by actinic light, (III) addition polymerizable ethylenically unsaturated components capable of forming polymers by photoinitiated polymerization in the presence of the initiators, and (IV) a natural or synthetic rubber.