Abstract: Process and apparatus for applying a flowable coating medium to a travelling web by a reverse applicator roll technique in which the peripheral velocity of the applicator roll (U) is maintained at less than 0.4 of the forward speed of the web, and the dynamic viscosity of the coating medium (.eta.) is selected in accordance with the relationshiph=k.eta..sup.0.5 U.sup.0.5,wherein k is from 0.01 to 100, such that a layer of coating medium of equilibrium thickness (h) not exceeding 5.0 mm is entrained on the surface of the applicator roll for transfer to the web. The technique avoids the use of a doctor blade to meter the amount of coating medium on the applicator roll, and is suitable for the high speed application of a heat sealable coating layer onto a polymeric packaging film. Coating quality can be improved by stabilizing the web downstream of the applicator roll.

Abstract: Disclosed is a technique for providing a protective oxide layer on an alloy. The technique involves the preliminary cleaning of the alloy's surfaces to remove as much unwanted oxide as possible and the subsequent exposure of the alloy surface to an environment which produces an acid resistant oxide by selective oxidation of one of the constituents of the alloy and which acts as a reducing environment for other constituents of the alloy. For the production of a chromium oxide layer on a stainless steel comprising chromium, iron, and nickel, a suitable environment includes a 600.degree.-1200.degree. C. mixture of H.sub.2 and H.sub.2 O. If a major portion of the mixture is H.sub.2, the chromium is oxidized whereas the iron and nickel are not.

Abstract: A process for spin coating a substrate such as a semi-conductor wafer uniformly with a coating solution such as a photographic emulsion by rotating the substrate at a first speed while simultaneously applying the coating solution at a radially moving position. Once the substrate has been initially covered, the speed of rotation of the substrate is increased and rotation continues until a uniform coating is obtained.

Abstract: A glass article is decorated with a thermoplastic ink which contains no frit. A finely divided heat fusible polymeric coating material is applied to the article over the ink. The article is heated to a temperature at which the particles of coating material fuse to form a smooth continuous film over the ink while the latter is in melted, semi-liquid condition. The melted ink diffuses into (but not through) the polymer film over it, thereby forming a melt-melt bond. The polymeric film imparts a serviceability to the ink which it would not otherwise display.

Abstract: A method is provided for coating a vulcanized polyalkylene rubber with a composition which contains an ethylenically unsaturated polyurethane binder containing active hydrogen atoms with a cross-linking agent for the polyurethane and a free radical initiator.The polyurethane binder is prepared by reacting an organic polyhydroxy compound, an acrylic or methacrylic hydroxy ester and an organic diisocyanate and reacting the resulting reaction product with a polyamine or alkanol amine.

Abstract: A water-based coating composition which emits very little pollutants on curing to a water-resistant coating comprises a synthetic resin containing free carboxyl groups held in solution or stable dispersion in water by an amine. The amine is a tertiary carbinamine containing at least two hydroxymethyl groups bonded to the carbon atom carrying the amine group. The coating compositions react with formaldehyde to produce stable fluid emulsion coating compositions having similar properties on curing. The coating compositions are used to coat substrates.

Abstract: Films are disclosed which are constituted essentially of iodides of heavy metals to which catalysts or sensitizing agents are added to make the films highly sensitive to light and current at room temperature, thus increasing the speed of writing and erasing cycles. The disclosure provides for producing and erasing images on such light and current sensitive films prepared on substrates such as ordinary paper or transparent non-reactive materials. Marking on the films is achieved by light e.g., laser beam and Xenon lamp, or electrical current. Exemplary erasing is done by application of heat. Several examples are disclosed of the formation of these films adherently on non-reactive surfaces.

Abstract: A fuser member and method of fusing or fixing thermoplastic resin powder images to a substrate in a fuser assembly of the type wherein a polymeric release agent having functional groups is applied to the surface of the fuser member is disclosed. The fuser member comprises a base member having an elastomer surface with metal-containing filler therein, said elastomer being cured with a nucleophilic addition curing agent.

Abstract: A reference electrode is rapidly automatically applied to the interior of tapered vitrified zirconia thimbles for an exhaust gas oxygen sensor. The coating is consistently smooth and predetermined in physical and electrical characteristics. In a specific example, a hollow elastomeric finger is nested within the thimble after dispensing a measured quantity of conductive ink into the thimble bottom. A gas jet applied to the ink from the finger lower end flows the conductive ink throughout a coating cavity below a shoulder in the finger after the ink quantity is substantially all applied to cavity walls, it no longer blocks a cavity vent, and allows the gas to flow freely through the cavity. Gas flow is then discontinued, and the finger withdrawn from the thimble.

Abstract: Disclosed is a method for obtaining a tenacious insitu coating deposition of calcite on the inner surface of water pipes. The calcite coating method according to the present invention has an advantage that it is able to maintain a completely corrosion-free system during the coating, thus assisting the formation of a protective coating of good bonding properties. The method consists in the incorporation of a reagent selected from the group consisting of alkali metal sulfite and hydrazine, in an amount which is at least the stochimetrically required to deoxygenate the aqueous solution utilized for said coating, which is supersaturated with respect to calcium carbonate having a dissolved calcium and carbonate levels of above 100 ppm. The calcite producing ingredients are supplied to the water stream in quantities supplementing concentrations available in the natural water used, giving the required supersaturation levels by addition of suitable salts.

Abstract: Disclosed is a method for coating substrates with a stress-crack resistant coating of a fluoropolymer and a polyfunctional compound having two or more allyl groups such as triallylcyanurate or triallylisocyanurate wherein the fluoropolymer is a polymer comprised of ethylene, chlorotrifluoroethylene or tetrafluoroethylene and optionally a termonomer such as 3,3,3-trifluoro-2-trifluoromethyl propene. The ingredients are homogeneously blended and applied to the substrate which is maintained at an elevated temperature to allow flow-out of the coating mixture thereby forming a stress-crack resistant coating.

Abstract: A plurality of fingerprints of a person are recorded by applying a solution of a first substantially colorless chemical reagent to the fingertips. Essentially invisible fingerprints are obtained by gently pressing the fingers having the solution of the first chemical reagent thereon on a suitable recording sheet. Subsequently the recording sheet is exposed to sublimed vapors of a second chemical reagent. The first and second chemical reagents are selected to react with one another to yield a highly colored substance which is formed on the surface of the recording sheet providing a visible image of the fingerprints. Ferric chloride and a 8-hydroxyquinoline are ideally suited chemical reagents for use in this invention. An apparatus of unitary construction incorporating a replaceable dispensing pad having the solution of the first chemical, is disclosed.

Abstract: Aqueous acidic chromate coating solutions are described for treating zinc, zinc alloy, or cadmium surfaces comprising trivalent chromium as substantially the only chromium ion present, fluoride ion and an acid, the trivalent chromium ions comprising a mixture of green and blue trivalent chromium. One method of preparing the green trivalent chromium is by reducing an aqueous solution of hexavalent chromium with sufficient reducing agent to reduce all of the hexavalent chromium to trivalent chromium. The blue trivalent chromium can be prepared by reducing hexavalent chromium with reducing agent and adding an acid and fluoride ion (pH<1). Chromate coatings on zinc, zinc alloy and cadmium surfaces are produced by contacting said surfaces with an aqueous acidic solution of the invention.

Abstract: A roll of pretaped, laterally folded masking material is mounted on a dispenser which is attached to the legpiece of one of a pair of stilts worn by masking workers. When the stilts are secured to the feet and legs of a worker, the dispenser supports the roll generally vertically alongside the worker's body with the taped end of the roll facing upwardly and positioned approximately at the level of his shoulder. To mask the walls in a room, the worker unrolls the folded material and fastens the tape continuously along the tops of the walls around the perimeter of the room while moving along the walls. The unrolled material is then cut from the roll and the portion below the tape attached to the walls is unfolded downwardly to completely mask the walls. To subsequently mask the floor, the worker attaches the taped edge of another length of the material along one wall to the free edge of the material already taped to that wall.

Abstract: Graft polyesters which are useful as adhesives and coatings and especially useful in processes for sizing spun and continuous filament synthetic organic and inorganic fibrous yarn. One embodiment of the invention is a textile size composition having free carboxyl groups which is prepared in situ on a textile yarn by the application of heat or radiation to a mixture of an unsaturated polyester reactant and a monovinyl monomer reactant comprising an acidic monovinyl monomer having at least one carboxyl group or mixtures thereof with any monovinyl monomer.

Abstract: A donor material for carbonless copying by contact with an acceptor material under applied pressure includes a sheet of paper or the like, and a coating on one face of the sheet. The coating consists essentially of a dye precursor, a wax solid at 20.degree. C. and capable of dissolving the precursor, and a liquid activator soluble in the molten wax, but at most sparingly soluble in the solid wax and incapable of dissolving the dye precursor, the wax and activator being chemically inert to the dye precursor.

Abstract: PCT No. PCT/US79/00526 Sec. 371 Date July 23, 1979 Sec. 102(e) Date July 23, 1979 PCT Filed July 23, 1979 PCT Pub. No. WO81/00096 PCT Pub. Date Jan. 22, 1981Described is an aqueous dispersion coating composition consisting essentially of an epoxy powder paint and a water carrier wherein the water has dissolved therein a water soluble nonionic surfactant in an amount ranging from about 0.01 to about 10% by weight (PBW) of the dry epoxy material and a dispersing agent in an amount from about 0.01 to 10 PBW of the dry epoxy material, wherein the pigment volume concentration of the coating composition is at least 10. Also described is a method of coating formed fiber reinforced plastics, such as sheet molding compound.

Abstract: Continuous glass fiber with a polyolefin compatible sizing composed of a coupling agent, a stabilizer, a lubricant, a non-crosslinking film forming polymer, softening agent and surfactant are disclosed for utilization in polyolefin polymer reinforcement. The article formed and formation method for fiber combination with a polyolefin polymer are also disclosed.

Abstract: A decorative coating for application to ceramics contains no metallic gold but has the appearance of gold after firing. The coating is formed by dissolving solvent-soluble metallo-organic compounds of palladium, silver, and a fluxing agent in a vehicle. A weight ratio of palladium to silver of between 1:1 and 12:1 is used and the total content of palladium and silver in the coating as applied will range between 1 and 12 weight percent, the balance being fluxing agents and vehicle. When applied to opaque or translucent ceramic bodies and fired in the usual manner for such decorations, the appearance obtained previously only with decorations containing substantial amounts of metallic gold is simulated.

Abstract: A method of producing ferromagnetic metal powder comprises the steps of dipping an iron compound powder in a solution in which an aluminum compound and/or a titanium compound is dissolved, removing solvent from the iron compound powder, reducing the iron compound powder in a reducing atmosphere at an elevated temperature and forming oxide layers on whole surfaces of the individual particles of the iron powder. Ferromagnetic iron powder produced according to this method has both a high coercive force and a high remanence ratio.