Abstract: A positive relief image is produced by coating a substrate with a layer of a copolymer containing about 90-98 mole percent of polymerized lower alkyl methacrylate units and about 2-10 mole percent of polymerized lower haloalkyl methacrylate units, heating the layer to cause cross-linking between polymer chains by removal of hydrogen halide, patternwise exposing the layer with high energy radiation such as a scanning electron beam, and removing the exposed portion of the layer with a solvent developer.The purpose of this abstract is to enable the public and the Patents and Trademark Office to rapidly determine the subject matter of the technical disclosure of the application. This abstract is neither intended to define the invention of the application nor is it intended to be limiting as to the scope thereof.

Abstract: A process for coating an optical plastic substrate, for example polymethylmethacrylate (PPMA), with a single layer coating for the purpose of improving the durability of the plastic, the coating being deposited by a low temperature plasma polymerization process.

Abstract: A coating powder is made by preparing a composition of two different diglycidyl ethers of bisphenol A and a curing agent, extruding the composition, cooling it to form a solid, and grinding the solid into a powder. Wire or other articles are coated with the coating powder in an electrostatic fluidized bed or with an electrostatic gun and the powder is cured.

Abstract: Highly durable coatings are formed by the photopolymerization of screen printing inks containing aryloxyalkyl acrylate monomers or prepolymers, a polymerizable diluent and a free-radical initiating system, such inks having a viscosity of 5,000 to 200,000 centipoises and a thixotropic index of from 1 to 6. The photopolymerizable inks are useful for coating substrates, such as printed circuits, and serve as solder masks and resists for electroless plating, electroplating and etching.

Abstract: Particles, such as fertilizer, are encapsulated with a metal carbonate coating by initially coating the particles with a metallic hydroxide, metallic oxides or mixtures thereof and subjecting the coated particles to an atmosphere containing carbon dioxide so as to convert the metallic compounds to the corresponding carbonate. Inert materials such as powdered linestone can be included with the coating.

Abstract: Improving the adhesion of a gelatin coating to a styrene homopolymer or copolymer film by solvent treating and corona discharge treating the film prior to coating with a gelatin layer in the production of a coated photobase.

Abstract: A tissue processing method utilizes a closed system for sequentially immersing light microscopy tissue specimens in treating fluids preparatory to embedding or in staining fluids. Treating or staining fluids, including paraffin, are drawn into the processing chamber by use of vacuum and are forced back to their respective containers by use of pressure and the specimens remain substantially stationary throughout the fluid treatment.

Abstract: An investment shell mold inhibited against reaction with molten titanium, zirconium and other reactive and refractory metals cast therein is made by investing a pattern with successive dip coats and stucco coats. The first dip coat includes a tungsten and/or molybdenum compound inhibitor-former which is reducible by hydrogen to metallic tungsten or molybdenum. After removal of the pattern, the green mold is dried and then pyrolyzed in an atmosphere of hydrogen under conditions predetermined to convert the inhibitor-former to metallic condition. This creates on the mold interface a coating of metallic molybdenum or tungsten which serves as a physical barrier, inhibiting reaction of a molten reactive or refractory metal subsequently cast in the mold, with the mold material and binder particles of the latter.

Abstract: The invention relates to the labelling of textile and other flexible sheet articles in which a marking element is used which is adapted to be attached and bonded to the article by heat and pressure, said element including a heat-curing film-forming resin system in the presence of blocked cross-linking groups and under acid conditions, such resin system becoming heat-cured during the attachment of the marking element to the article to form an inert, insoluble and wear-resistant marking on the surface of the article. The resin system may be an alcohol-soluble copolyamide in the presence of a cross-linking agent which may be a precondensed alcohol-modified formaldehyde or aminoplast resin containing alkoxy alkyl group; or it may be a dispersion of a film-forming addition resin system at least one monomer of which contains groups capable of reacting with similar cross-linking agents or comonomers bearing alkoxy-alkyl groups.

Abstract: Disclosed is a process of coating discrete, unagglomerated particles of less than 20 microns with a high polymer coating, and compositions such as conductive compositions using such coated particles. The particles are coated with the polymer in a fluid energy mill such that substantially uniform coated particles are obtained which are free-flowing, non-agglomerative and readily dispersable in a suitable binder.

Abstract: Hydrophilic polymers, i.e., hydrophilic cellulose esters, hydrophilic cellulose ethers, hydrophilic polyurethanes, hydrophilic vinyl lower alkyl ether polymers, vinyl alcohol group containing polymers, partially hydrolized polyacrylonitrite, ethylene-maleic anhydride copolymer, stryene-maleic anhydride copolymer, proteins, high molecular weight polyalkylene oxides or phenoxy resins, having encapsulated therein either or both anti-fouling agents or pigments is applied as a coating to underwater portions of a marine structure so as to reduce the drag of said structure.

Abstract: The apparatus provides a homogeneous (with respect to particle size), dense, mass of sized particles in random motion so that highly uniform coatings of the same or of different solids can be applied to each particle by conventional spray-coating with the liquified coating material(s). The apparatus is a horizontal rotary drum containing lifting flights. A novel deflector pan is fixed in space inside the upper section of the drum which deflects particles falling from the lifting flights to the side of the drum where they form a narrow, dense falling cascade. The coating material is sprayed onto the cascading particles, preferably as they free-fall after leaving the lower edge of the pan. However, if desired, some or most of the coating material may be directed onto the top edge of the moving bed including the juncture of the cascade therewith.

Abstract: A process for decreasing the hygroscopicity of a polycarboxylate, said process comprising preparing a melt of a composition having a melting point of about 40.degree. - 120.degree. C, said composition giving an acid or neutral pH in an aqueous solution or suspension, said composition being less hygroscopic than said polycarboxylate, said composition capable of being free flowing under equilibrium conditions at about 30.degree. C and in an air atmosphere of at least about 40% relative humidity; heating said melt in a mixer to a temperature of up to about 140.degree. C; gradually adding said polycarboxylate as a powder to said melt while mixing said melt; wherein said composition comprises at least about 3 and at most about 40% by weight of the mixture resulting after all polycarboxylate has been added to said melt.

Abstract: A process for the controlled release of a substance which comprises impregnating a substance to be released into and within a cellulosic polymer-liquid composite material as a part of or all of the liquid phase, and the controlled release material as produced.

Abstract: A carbohydrate bonded support for use in a chromatographic system, and a method for preparation of such a support is disclosed herein. An inorganic support has a thin layer of carbohydrate or carbohydrate derivative covalently linked to the surface so that the thus formed support has excellent mechanical stability as well as the ability to avoid adsorbing or denaturing sensitive biological compounds, the carbohydrate bonded support thus combining the advantages of known supports without also incorporating the disadvantages thereof.

Abstract: A submersible object having a drag reducing coating thereon, and a method r its preparation, which comprises applying to the object a binding agent and sufficient hydrophobic silica to provide the object with a nonuniform coating, the function of the binding agent being merely to fix the hydrophobic silica on the submersible object.

Abstract: Wood chips used in making composition board are coated with a resinous liquid binder by first applying a coating of the resinous liquid to the inner surface of a moving wall portion of an enclosure for the chips and then moving the coated wall beneath the chips while simultaneously wiping the chips across the coated wall surface to remove resin from the surface and coat the chips. In an illustrated embodiment, the enclosure is a revolving drum with stationary end walls. Uncoated chips are fed into the drum through one end wall while coated chips are discharged through the opposite end wall. The interior of the drum is partitioned into a resin-applying compartment and a chip compartment. A spray applicator in the former applies resin to the inner surface of the revolving drum upstream of the chips while rapidly rotating paddles within the chip compartment move the particles into contact with the resin-coated inner surface of the drum.

Abstract: A process for coating moldings of plastics which tend to stick together at room temperature by applying solutions containing a nonadhesive resin of (1) a copolymer of at least one member of the group consisting of styrene and methylstyrene and a monoester of at least one member of the group consisting of maleic and fumaric acid or (2) a reaction product of at least one member of the group consisting of cyclohexanone and methylcyclohexanone with formaldehyde or acetaldehyde, said non-adhesive resin having a monoscope yield point or more than 80.degree.C. and a ball indentation hardness of from 310 to 800 kp/cm.sup.2 at 10 seconds and thereafter evaporating the solvent at a temperature which is lower than the softening point of the material to be coated.

Abstract: Organic or inorganic particulate solid substances are coated with a polymeric material by dispersing the particulate solids, the surfaces of which have been treated so as to be compatible with the polymer coating, in a solution containing the polymer dissolved in a water-immiscible solvent, slowly introducing into the dispersion an aqueous solution of a hydrophilic protective colloid, thus producing an emulsifying liquid medium, and removing therefrom the solvent, to finally obtain polymer coated solid particles. The polymer-coated powder thus obtained is useful for application to various substrates by fluidized bed coating, electrostatic spraying, or electrophoretic deposition, followed by sintering to form films.

Abstract: A mould for casting metals by the "lost wax" process is formed by coating an expendable pattern with refractory powder in a binder dispersed in an aluminum hydroxyhalide solution. The coating is hardened by an acetate or lactate.BACKGROUND OF THE INVENTIONThis invention relates to the preparation of moulds for casting metals and alloys, particularly to the preparation of moulds which are used in the investment casting, or "lost wax" process. These moulds are prepared by applying to an expendable pattern made of wax, plastic or a low melting alloy at least one coating of a refractory powder suspended in a suitable binding agent.SUMMARY OF THE INVENTIONAccording to the present invention there is provided a method of preparing a mould suitable for use in the casting of metals or alloys includes the step of coating an expendable pattern with a composition which is a finely divided refractory powder dispersed in an aqueous alcoholic solution of an aluminium hydroxyhalide of the general formula Al.sub.2 (OH).sub.