Showing papers on "Coating published in 1979"

Stable protective seed coating

Abstract: A stable, liquid seed coating composition is provided, including a binding agent, an active ingredient and a coloring agent in a liquid medium including water and a polyol.

Light emitting fabric

Abstract: A light emitting fabric (10) in which optical fibers (12, 28, 46, 48) are part of the weave, replacing some of the threaded fibers (27), whereby the fabric is uniformly illuminated and, accordingly, decorated. The individual optical fibers are gathered into a bundle (15) at one end of the fabric and illuminated by a light source (17). Light traveling through the fibers is emitted in small amounts throughout the lengths thereof through small scratches (14) that pierce the outer coating. Uniformity and intensity of light are enhanced by providing a reflective coating (13) on the non-illuminated ends of the optical fibers. This fabric is usable in clothing; such as costumes, high visibility safety clothing, suntan suits (21); rugs, draperies, theater curtains, architectural panels (23), fiberglass boat hulls, and the like.

Nonstick conductive coating

Abstract: In a preferred embodiment, there is provided a conductive non-stick electrode for use with a hemostatic tissue cutting scalpel wherein, a first layer of conductive material having a textured working surface for contacting tissue is adherently deposited along the cutting edge of the scalpel, and a second coating of non-stick material is deposited thereon at least partially filling the textured surface, so that portions of the conductive material are exposed and the electrode is thereby conductive along said working surface but non-sticking while in contact with tissue.

Soft corneal contact lens with tightly cross-linked polymer coating and method of making same

Abstract: A soft corneal contact lens comprising a soft, highly oxygen-permeable, polymeric lens having formed on the surface thereof an ultrathin, optically clear, impermeable barrier coating. The barrier coating is tightly cross-linked and comprises the reaction product resulting from an electrical glow discharge polymerization process conducted in a gaseous atmosphere and will prevent diffusion into the lens of lipids and other large molecules from the eye's tear film. The lens is formed from silicone or polyurethane. The gaseous atmosphere consists essentially of compounds selected from the group consisting of hydrocarbons; halogenated hydrocarbons; halogenated hydrocarbons and hydrogen; hydrocarbons and a halogen; and a mixture of any two or more of these compounds. The surface of the fully formed lens is highly hydrophilic which is accomplished during the polymerization process or in an additional step comprising glow discharge in the presence of oxygen or argon.

The origin of residual internal stress in solvent‐cast thermoplastic coatings

Abstract: Experiments on polystyrene and poly(isobutyl methacrylate) coatings cast from toluene have shown that residual internal stress is independent of dried coating thickness and initial solution concentration. A theory is presented that predicts the magnitude of the stress and shows that it has no dependence on thickness or initial solution concentration. Internal strain is calculated from the volume of solvent lost after the coating has solidified. This solidification point is identified with the solvent concentration that is sufficient to depress the glass transition of the polymer to the prevailing experimental temperature. A one-to-one correlation is confirmed between the volume of solvent lost from solution during drying and the volume change of the polymer film.

Antireflective coatings applied from metal–organic derived liquid precursors

Abstract: Antireflective (AR) coatings, which are produced from organometallic driven solutions containing oxide constituents in a chemically polymerized form, are presented. These solutions leave a film on substrates which, upon heat treatment, converts to a glasslike oxide film having the desired optical thickness and index of refraction. The index can be varied continuously from 1.4 to 2.4; thus the AR coatings can be fine-tuned for different substrates and for specific wavelengths of light. Silicon solar cells AR-coated by this technique showed as much as 49% improvement in efficiency over the uncoated state. The real advantage of the process, however, lies in the fact that it is simple, well-suited for automated mass production of photovoltaic cells, and reduces the cost of coating application from an estimated $0.20 per W-package to about $0.01 per W-package.

Prosthetic devices having sintered thermoplastic coatings with a porosity gradient

Abstract: Coated Prosthetic devices useful in the medical and dental fields, such as dental implants, intramedullary nails, and total hip prostheses, are provided having a porosity or density gradient in the sintered plastic coating. The higher porosity is at the outer surface which facilitates bone ingrowth while the lesser porosity which has a higher density and a more continuous plastic layer is on the inner surface and thus provides better adhesion to the load bearing component.

Thin film deposition apparatus using an RF glow discharge

Abstract: An RF plasma deposition apparatus for depositing a film of material on substrates positioned in a vertical plane and electrically "floating" within the glow discharge. For deposition of silicon nitride films, the apparatus is adapted to introduce silane gas in a substantially uniform and laminar flow into a coating cavity containing substrates, a ground screen electrode, and a "hot" RF electrode, within which a glow discharge is ignited. Elemental nitrogen may be delivered to the coating cavity after being dissociated in a local, separate RF plasma called an "atomizer" cavity. During coating, elemental nitrogen combines with elemental silicon and deposits silicon nitride upon the substrate surface.

Porous flexible vascular graft

Abstract: Novel cardiovascular prosthetic devices or implants having many useful cardiovascular applications comprise a porous surface and a network of interconnected interstitial pores below the surface in fluid flow communication with the surface pores. Tissue forms a smooth thin adherent coating of self-determining thickness on the porous surface making it resistant to the formation of the blood clots normally associated with the presence of foreign bodies in the blood stream. The device has particular utility in heart valves, pacemaker electrodes, blood pumps, blood stream filters, an artificial pancreas, vascular access tubes, small and large bore vascular grafts, blood pump diaphragms and vascular and intracardiac patches.

Method of forming semiconducting materials and barriers

Abstract: In a gaseous glow-discharge process for coating a substrate with semiconductor material, a variable electric field in the region of the substrate and the pressure of the gaseous material are controlled to produce a uniform coating having useful semiconducting properties. Electrodes having concave and cylindrical configurations are used to produce a spacially varying electric field. Twin electrodes are used to enable the use of an AC power supply and collect a substantial part of the coating on the substrate. Solid semiconductor material is evaporated and sputtered into the glow discharge to control the discharge and improve the coating. Schottky barrier and solar cell structures are fabricated from the semiconductor coating. Activated nitrogen species is used to increase the barrier height of Schottky barriers.

Solventless release compositions, methods and articles of manufacture

Abstract: A solventless release coating composition is provided as well as a method for rendering materials nonadherent to other materials which would normally adhere thereto. The coating composition is a platinum-metal-complex catalyzed silicone composition comprising a vinyl or silanol functional polysiloxane base polymer and a methylhydrogen crosslinking agent. Diallylmaleate is added to the composition in order to extend the useful shelf-life of the product by inhibiting any premature crosslinking reactions; the useful pot-life at ambient temperatures of the catalyzed composition can also be extended.

Spin coating process

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.

Method for providing enteric coating on solid dosage forms and aqueous compositions therefor

Abstract: A novel aqueous coating composition is proposed for providing enteric coating on solid dosage forms such as tablets. The aqueous coating composition of the invention comprises a fine powder of an enterosoluble cellulose derivative such as hydroxypropylmethylcellulose phthalate and hydroxypropylmethylcellulose acetate succinate, which is insoluble in water but can be plasticized and solubilized with certain plasticizing agents, as dispersed in an aqueous dispersing medium and a plasticizing agent having compatibility with the enterosoluble cellulose derivative and dissolved in the aqueous dispersing medium. The particle size of the enterosoluble cellulose derivative and the boiling point of the plasticizing agent is the key parameters and should be finer than 100 μm in an average particle diameter and not lower than 100° C., respectively. Upon application of the aqueous coating composition to the solid dosage forms, water as the dispersing medium is first evaporated leaving the cellulose derivative and the plasticizing agent, which latter solubilizes the former to form a continuous coating layer on the solid dosage forms imparting good and satisfactory enterosolubility thereto.

Method of producing a microstructured surface and the article produced thereby

Abstract: A method is disclosed for producing a micro structure on the surface of an article. The method comprises the steps of depositing a discontinuous coating of a material exhibiting a low rate of sputter etching on a substrate exhibiting a higher rate of sputter etching and differentially sputter etching the composite surface to produce a topography of pyramid-like micropedestals random in height and separation. The articles produced by this method are characterized by both the microstructured surface and by the detectable presence of the material exhibiting the lower rate of sputter etching. The microstructured surface results in the articles having uniform antireflecting properties over a large range of angles of incident light and over an extremely broad range of wavelengths, in which the antireflecting characteristic is obtained without an attendant increase in diffuse scattering. Also, the microstructured surface results in the articles being characterized by a high degree of adherence, such that the treated surface may be considered to be "primed", thereby enabling the application of highly adherent coatings or layers thereon.

Coated transparent film for laser imaging

Abstract: Disclosed is a laser-imagable material comprising a transparent film having thereon a dried coating comprising graphite particles and binder. Also disclosed is the method of making the laser-imagable material and the method of imaging it.

Development of Electrical Conduction in Silver-filled Epoxy Adhesives

Abstract: Although percolation theory predicts that insulators containing ca. 20% or higher volume loadings of dispersed metallic particles should be electrically conductive, some commercial silver-filled epoxies fail to be so unless subjected to thermal cure. It was found that this is due to an insulating coating on the silver particles, presumably added to promote dispersibility. This coating consists of a mixture of fatty acid salts of copper, and is removed under the action of heat, primarily through decarboxylation. When the silver powder is heated alone or as a dispersion in an inert matrix (silicone oil), this occurs above 200°C, rendering the specimens conductive. The onset of electrical conduction can be brought down to much lower temperatures by addition of small amounts of solubilizers, such as long chain organic compounds containing numerous ether linkages. Such materials, when added to commercial conductive epoxies at very low concentrations, increased the conductivity by a factor of two to three. Shri...

Process for applying a moisture barrier coating to baked and fried food products

Abstract: A composition of matter comprising a water in oil emulsion or colloidal dispersion prepared from an emulsified triglyceride or an emulsifier only in combination with an aqueous solution of a dextrin or other soluble saccharides or polysaccharide. The emulsion, prepared by the addition of heat and agitation, is thereafter applied to the surface of a food product by dipping, enrobing, spraying or any other suitable application means to the food product, the excess is removed by suitable means and the coating is allowed to set or dry prior to further processing or packaging of the food. Coating thickness, pick-up and setting of the coating is accelerated by control of both the temperature of the coating composition of matter at the time of application and the surface temperature of the food product.

Photocurable acrylic coated polycarbonate articles

Abstract: A polycarbonate article having a durably adherent mar, abrasion and chemical resistant UV cured coating on the surface thereof comprised of the photoreaction products of (i) certain polyfunctional acrylate monomers and (ii) resorcinol monobenzoate.

Curable coating composition

Abstract: Curable coating compositions of olefinically unsaturated compounds A and an N-vinyl compound B The N-vinyl compounds carry at least 2 N-vinyl groups and at least one carbonyl group bonded to the nitrogen of the N-vinyl group The coating compositions can be used for the manufacture of paints, printing inks, printing plates and photoresist materials

Process for producing elevated temperature corrosion resistant metal articles

Abstract: A process for providing coatings on metal articles whereby the articles will be resistant to corrosion at elevated temperatures. The process involves the application of an overlay on an article surface, the overlay comprising a ductile metal of a composition normally resistant to corrosion at elevated temperatures. An outer layer of aluminide or metal which is resistant to corrosion at elevated temperatures but which is subject to embrittlement at such temperatures is applied to complete the coating. Porosity in the coating is then eliminated and a high integrity corrosion resistant coating not subject to cracking is obtained by heating the article in a gaseous atmosphere to elevated temperature and simultaneously applying isostatic pressure to the article.

Insole with material released under foot loads

Abstract: An insole for footwear has odor masking or malodor counteractant material dissolved, trapped or encapsulated in a somewhat resilient resin coating through which it will progressively migrate or bleed under application of foot loads, foot perspiration and elevated foot temperatures to the surface of the coating to be released into the footwear to mask or counteract foot odors. The material may take the form of volatile fragrances or perfumes or materials which interact with bacteria causing foot odors, such as chlorophyll, esters and salts of certain fatty acids. Release or bleeding of the material is relatively dormant until activated by foot loads, foot perspiration or elevated temperatures. Initial foot loads, foot perspiration and elevated temperatures release the material closest to the surface of the coating in which the material is trapped and then migration proceeds slowly and progressively under repeated foot loads to provide a prolonged release time. The material which does not migrate to the surface under initial foot loads remains trapped and available for migration and release under subsequent foot loads.

Method for producing an inhomogeneous film for selective reflection/transmission of solar radiation

Abstract: A sputtered thin film coating characterized by a stepwise and/or variable refractive index as a function of film depth. By means of an in-line assembly of planar magnetrons, each magnetron essentially isolated from the others but for a region of sputtering overlap, select materials and combinations of said materials with reactive gases can be continuously deposited upon a dynamic substrate whereby to obtain pre-determined refractive index gradients. Substrates coated with an inhomogeneous thin film exhibit superior non-spectral reflective characteristics particularly desirable for architectural designs and applications.

Water-borne coating composition made from epoxy resin, polymeric acid and tertiary amine

Abstract: Water-borne reaction products of (a) carboxyl-functional polymers; (b) polyepoxides; and (c) tertiary amines are useful as film-forming components of coating compositions which can be spray-, flow-, dip-, roller-, or electro-coated. The coating compositions are useful as such or can be crosslinked with crosslinking agents such as a nitrogen resin and, when coated on metal and paper substrates, they provide coatings of improved properties, including a high degree of flexibility during machining and stamping of the coated articles, corrosion resistance, gloss, hydrolytic stability, and nonadulterating of foods and beverages in contact therewith.

Polypropylene film with primer of a water dispersed epoxy resin coating

Abstract: Thermoplastic films, such as polypropylene, are coated with a vinylidene chloride based multipolymer to enhance the physical properties of such films. The coating is anchored to the base film by first applying a primer coating directly on the film surface, which primer coating comprises a water dispersed epoxy resin composition.

Airless spray method for depositing electroconductive tin oxide coatings

Abstract: Electroconductive tin oxide coatings are deposited by an airless method of spraying a liquid composition of a thermally decomposable tin compound onto a hot glass surface in order to prevent overspray of the liquid coating composition onto the opposite glass surface.

Fining sheet and method of making and using the same

Abstract: A glass fining sheet particularly suited for finishing rough ground vitreous surfaces to provide a surface finish which may be readily polished comprises a flexible, conformable backing sheet bearing a microcellular abrasive granule-resin matrix which, under use conditions and in the presence of an aqueous flow, generates a fining slurry. The fining sheet according to this invention is prepared by coating a flexible conformable backing sheet with a foamed liquid abrasive granule-resin coating composition comprised of liquid curable binder material, abrasive fining granules and sufficient compatible solvent to provide a coatable composition. Such coating provides a cellular layer which releases the fining abrasive granules at a controlled rate under use conditions.

Manufacture of semiconductor device

Abstract: PURPOSE:To form a device of high quality which operates stably on an insulation substrate without forming a parasitic MOS on the flank. CONSTITUTION:On sapphire substrate 31, an island of Si thin film 32 is made, thermally-oxidized coating 34 is formed, and CVDSiO234' is stacked. Sensitive agent 35 is applied and only the part over layer 32 is selectively removed. Films 34 and 34' are removed by mask 35, which is also removed, so that Si 32 will be separated in an island shape with SiO2 films 34 and 34' between. In this method, oxidized film 34 can be formed much faster than a conventional one, impurity contamination from the insulation substrate to layer 32 is reduced, and an increase in crystal defect can be prevented which is caused by differences in thermal expansivity and lattice constant. In addition, since the flank is covered with a thermally-oxidized film, the interface is hard to get contaminated and at the time of formation of a MOSFET, the leakage caused by the parasitic MOS generated on the flank is reduced, so that the device will become stable.