Abstract: This specification discloses a mold for use for press-molding an optical element, characterized in that at least the molding surface of a mold base material is coated with an a-C:H film containing 5-40 atom % of hydrogen therein and having a film density of 1.5 g/cm.sup.3 or more. Other mold coating films also disclosed are a hydrogenated amorphous carbon film with an intermediate carbide layer between the film and the molding surface, and a hard carbon film containing 0-5 atom % of hydrogen therein and having a spin density of 1.times.10.sup.18 spin/cm.sup.3 or less and a film densisy of 1.5 g/cm.sup.3 or more.

Abstract: A method of treating the surface of a mold to improve its release characteristics is disclosed. A coating of a polyamic acid solution comprising the reaction product of 2,2-bis[4-(aminophenoxy)phenyl]hexafluoropropane and an aromatic tetracarboxylic acid or dianhydride or ester derivative thereof is applied to the mold surface. The coating is cured at elevated temperatures to remove the solvent and form the corresponding polyimide.

Abstract: A mold surface is first treated with an enameling composition which, while still unfused, is provided with a distribution of particulate material such as sand; the mold surface is then fired and then a second coating of predetermined thickness is applied over the first coating including the particulate material followed by a second firing to finish the mold.

Abstract: A synthetic press roll for use in paper machines includes a cylindrical mantle to which a surface layer is applied, the surface layer comprising a mixture of a first powder of metallic material and a second powder of an inorganic material. The metallic material of the first powder includes copper, bronze, stainless steel, nickel, chromium and/or a titanium alloy. The inorganic material of the second powder comprises quartz, feldspar, Al.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, TiC, SiC, MgO, Si.sub.3 N.sub.4, Cr.sub.2 O.sub.3, WC, NbC, VC, Cr.sub.7 C.sub.3, or other corresponding ceramic material, or mixtures of the same. The surface layer may be produced by thermal spraying, casting, by winding a sintered or rolled band of the mixture around the mantle, or by forming a flexible mat pre-coating in which the desired mixture is bound by a binder, such as PTFE, and by fixing the precoating to the roll mantle by melting it by means of induction or laser heating.

Abstract: A process for substantially eliminating surface melt fracture during extrusion of a thermoplastic polymer such as a molten narrow molecular weight distribution, linear, ethylene copolymer, by using a die having a die land region defining opposing surfaces at least one of which is coated with a composition containing about 80% to 99% nickel and about 1% to 20% phosphorous.

Abstract: A plastics shaping mold comprising a layer of hardened resin material fixedly superposed on a metal mold and defining an uneven shaping surface for forming an uneven surface pattern on plastic articles. The plastics shaping mold is prepared by a method comprising the steps of superposing a resin material in a fluid state on a master in sheet form defining an uneven surface inverse to the uneven shaping surface to be formed, allowing the resin material to harden and removing the master, thereby to form the layer of hardened resin material defining the uneven shaping surface.

Abstract: The coating for the metallurgical vessel (1) comprises a permanent refractory lining (2) and a refractory wearing layer (4) which is constituted by an aqueous slurry containing inorganic particles and a binder. The coating further comprises a waterproof layer (5) between the refractory lining (2) and the wearing layer (4). The coating serves to prevent water derived from the wearing layer from penetrating into the permanent lining.

Abstract: A process for producing polyurethane foam articles is described, in which the article is produced in the conventional manner by foaming in a mould and a release agent is applied to the mould surface prior to filling with the foam-producing components. According to the invention, a solvent-free, aqueous release agent is used in combination with one or more alkali metal and/or ammonium salts of higher fatty acids and one or more higher alcohols and the combination is applied in the hot state, preferably at a temperature of at least 75.degree. C. to the mould surface. In addition, an additive is described, which is suitable for performing the process according to the invention and contains one or more alkali metal and/or ammonium salts of higher fatty acids, one or more higher alcohols and otherwise water.

Abstract: Cast-iron mold for the production of glass containers by using a "pressed-blown" or "blown-blown" technique wherein the parts exposed to the parison are coated with a uniform alumina layer of which the thickness is less than 5 micrometers. The invention applies to industrial techniques for producing glass containers such as bottles, flasks, jars or the like.

Abstract: There is disclosed a low expansion glass-ceramic substrate for supporting a glass multifocal lens assembly during a fusing or sagging heat treatment. The substrate has baked on its supporting surface a paint composed essentially of titania, alumina and a mica.

Abstract: An extrusion die an be produced and reclaimed precisely, quickly and easily in an economical way, possesses a high abrasive-resistant property and a prolonged life, produces light-weight honeycomb structures having thin partition walls and provides a large reaction surface area within the honeycomb structure for the catalyst to contact with the exhaust gases, in addition to smooth passage of the exhaust gases with little pressure loss thereof, and mitigates or eliminates the drawbacks of conventional dies.

Abstract: A solid film lubricant composition for hot glass contacting surfaces of glass handling equipment and metal molds used in manufacturing glass articles. The solid film lubricant composition is a solution of a solvent, graphite, a solvent-soluble, further curable organopolysiloxane, and NaOH to make the solution alkaline. The solution is easily sprayed on hot glass contacting surfaces such as the interior of the molds to form a coating that is curable at room temperature.

Abstract: Metallized polymer compositions are disclosed, the surface of which comprises an intermetallic compound of a metal element A (Sn, As, Sb or Bi) and a metal element B (Fe, Co, Ni, Cu, Zn, Ga, Ru, Rh, Pd, Ag, Cd or In), preferably an intermetallic compound of antimony and a metal element B. Processes for producing such metallized polymer compositions involve either the reduction of a metal element A compound in the presence of metallic metal element B and the polymer or the compression of a laminate of metal element A and metal element B layers onto the polymer. The metallized polymers are useful in the production of printing circuit boards, electromagnetic interference shielding devices, membrane switches, capacitors, conductive fibers, magnetic tapes and disc, antistatic mats, barrier polymers and optical storage devices.

Abstract: A method of providing a mould 1 (FIG. 1) with a release layer, in which a hydrophilic, inorganic surface 2, 4 of the mould is treated with a silane compound of the formula (R).sub.m --Si--(X).sub.4-m under anhydrous conditions.

Abstract: A process for producing molded articles, especially molded polyurethane foam articles, wherein the mold is treated with an aqueous release agent or a concentrate of one or more release-active substances in organic solvent. The release agent is preheated, e.g. by an atomizer supplied with hot pressurized air, prior to being applied to the mold. The process enables the efficient use of water-base release agents and thus reduces the emission of harmful organic solvents into the atmosphere.

Abstract: Disclosed is a method of placing a measured amount of tracer material into a release agent solution so that the concentration of tracer material in the release agent as applied to a mold surface is an indication of the amount and distribution of the release agent on the mold surface. The release agent can be applied and/or re-applied until the amount of the tracer material reaches a predetermined value. In the embodiment disclosed the tracer material is a UV dye which will re-emit light when activated by a UV light source and the intensity level of the re-emitted light is a function of the amount of release agent applied.Curing of the release agent preferrably taken place after each layer in multiple layer applications.Also disclosed is a spray head (12) connected to a source (20) of release agent with UV dye therein for coating a mold surface (28). A source of UV light (30,32) activates the UV dye to re-emit visable light which is measured by a photometer (34) to practice the above method.

Abstract: A parting composition useful for continuously casting aluminum and aluminum alloys and comprising glycerol trioleate, castor oil and a copper corrosion inhibitor. The parting composition of the invention has superior properties compared with parting compositions previously used for continuous ingot casting. The copper corrosion inhibitor prevents deterioration around openings in oil injection rings made from copper.

Abstract: The present invention provides an improved lining structure composition on the inner surface of a tundish by forming an alumina-silica-base intermediate lining layer over which a magnesian surface coating layer is formed by gunning. It solves the adhesion defect on a refractory lining of the tundish and enables longer operation of the tundish.

Abstract: A release composition which facilitates the unmolding of bonding materials such as concretes from molds for purposes of pre-fabrication. Methods for facilitating the unmolding of such bonding materials by coating the mold with such release composition, and for casting molded, preformed articles include coating the mold prior to casting in order to facilitate the unmolding operations. The release composition is an aqueous anti-freeze solution containing no petroleum based products. It comprises a combination of at least one active release constituent which may be an organic acid salt, at least one clarifying anti-freeze agent which may be a hydroxyethylether; at least one spreading agent which is an ester; at least one polyether lubricating agent; and water as a solvent medium, in variable proportion according to the desired concentration.

Abstract: A lubricating process is disclosed for continuously casting molten metal through a mold or header including applying a parting lubricant containing alpha-olefin oligomer to the mold or header. In one aspect, the process includes applying a parting lubricant containing alpha-olefin oligomer and fatty ester.

Abstract: A one-piece open-ended water-cooled continuous casting mold and a method of making it to improve the service life of such mold made up from galvanically precipitated layers of which an inner layer consists of a wear-resistant metal such as nickel and an exterior layer is made particularly from copper. After the mold has been manufactured and while still on the core it may be further improved by application of external pressure.

Abstract: In order to facilitate the release of polyurethane from a steel or aluminium mould, the metal surface is provided with a mono-layer of an alkylmercaptan. A silver layer may be provided between the mould metal and the alkylmercaptan monolayer.The invention can be advantageously used for manufacturing a luminaire for a tubular discharge lamp.

Abstract: A diffusing plate having a smooth rough surface is obtained by recording on a photosensitive material the image of a mask having a regular fine pattern thereon, treating the photosensitive material to thereby obtain a photosensitive material having smooth roughness, transferring the smooth roughness of the treated photosensitive material to a metal mold, and embossing plastics on the metal mold.

Abstract: A method of preparing a mold surface for forming a pattern on a molded article includes masking the mold surface, sandblasting the exposed surface of the mold, cleaning the mold surface and then depositing a metal layer on the mold surface to provide a metal coated mold surface having areas of altered surface texture corresponding to the pattern. The mold is then used to bond a resin coating to a masonry unit to provide a decorative surface pattern to the exterior molded surface of the resulting composite masonry unit.

Abstract: Method of forming or shaping a resin-bound mass (e.g., core-making or mold-making pattern or core box, particle board, etc.) in or from shaping means having shaping surfaces and releasing the shaped resin-bond mass from the shaping surfaces, which comprises coating the shaping surfaces of the shaping means with an improved, substantially stable, alcoholic dispersion or solution of a release coating suitable for repeated use, heating the coated shaping surfaces of the shaping means for sufficient time to convert the coating thereon to a stable, cured, abrasive-resistant release coating, placing a curable resin-bound mass of solids to be shaped against the release-coated shaping surfaces, curing the resin-bound mass, and separating the cured resin-bound mass from contact with the release coated shaping surfaces. The coating composition comprises a substantially stable alcoholic dispersion or solution of a substantially pure silanol of the formula RSi(OH).sub.

Abstract: Mold release agents and means for their application are provided. The release agents are used in coating molds for forming expandible plastics. They are especially applicable to polyurethane-based reaction injection molding (RIM) systems. The release agents, which have a controlled saponified fatty acid content (unsaturated as oleate and/or linoleate and saturated as C.sub.8 to C.sub.12 alkanoate) make for significant advantage with respect to ease of release, prevention of residual build-up, mold and part cleanability, health and safety, cost, etc.

Abstract: A method of coating a surface of an article block includes utilizing a mold that has its interior surface electrolessly coated with a metal such as nickel where the mold is made from mild steel and further includes depositing a resinous composition in the coated metal mold and then inserting a surface of the article and then subsequently curing the composition by exposing the mold to heat; the exterior surface of the mold is oxidized and darkened to increase the capacity for the mold to absorb radiant heat; a method of preparing the mold is provided where the mold is electrolessly coated with the metal while the exterior surface thereof is masked to prevent the deposition of the coating metal on the exterior surface.

Abstract: Water based mold release agents and means for their application are provided. The release agents are used in coating molds for forming high resilience (HR) open-cell foamed plastics especially those known as HR seating foams. The release agents which contain lithium soap and polyol ester, give excellent performance with respect to ease of release, prevention of residual build-up, and mold and part cleanability. A key feature is that the release agents uniquely provide an open-cell foam surface in the resulting molded articles so that the same have high resilience.

Abstract: A method and apparatus is disclosed for powder coating the interior surface of a heated mold cavity. Electrostatically charged powder is sprayed upwardly onto the interior surface of a mold surrounded by a mask. The mask includes a shield located adjacent to but spaced from the shear edge of the mold. Additionally, the mask includes a vacuum duct located beneath the shield. While air is drawn into the vacuum duct air is either blown through the slot defined between the shield and the mold shear edge or air is pulled into the slot so as to prevent oversprayed powder from coming into contact with and adhering to the shear edge of the mold. There is no enclosure surrounding the mold cavity other than the mask because rising heated air currents entrap and maintain the cloud of sprayed powder interiorly of the mold cavity and the surrounding mask. Any oversprayed material escaping from the cavity is caught in the vacuum duct and carried to a powder collector.

Abstract: A mold release composition consisting essentially of:(A) a fluorine-containing polyether comprising 3-perfluoroalkyl-1,2-epoxypropane having the formula ##STR1## wherein R.sub.f represents a perfluoroalkyl group containing from 5 to 13 carbon atoms and(B) at least one additive selected from the group consisting of a silicone oil, silicone varnish, a wax and a highly fluorinated organic compound having a boiling point above 100.degree. C.

Abstract: The mold features on its work face a thermally insulating protective layer of sub-micron metal oxide particles.The coating can be applied by spraying an aqueous sol of a metal oxide onto the mold work face which has been heated to at least 60.degree. C.The use of sub-micron sized metal oxide particles enables the formation of a protective coating of very low density and consequently very low thermal conductivity. The coating can furthermore be deposited very economically, and likewise removed again.

Abstract: A method of depositing a metal coating on the wall of a chill mould for use in continuous casting wherein the mould is placed in a deposition bath such that an internal wall thereof to be coated is oriented generally upright, the deposition bath being composed of a solution containing at least one nickel salt and a suspension of particles of a hard metal having a critical deposition temperature range defined by upper and lower limit temperatures. A metallic layer containing nickel is deposited on the mould wall either by electrolytic or by electroless techniques, and during such deposition the mould wall is maintained at a temperature in the vicinity of one of the upper and lower limit temperatures while the solution is maintained at a temperature in the vicinity of the other of the limit temperatures, the temperature difference between the mould wall and the solution being within the aforesaid critical deposition temperature range.

Abstract: A method and apparatus for the coating of molding tools which comprises dispersing liquid or suspended lubricant in directional manner before each pressing operation in discrete, specific droplets onto the pressing zones of the molding tools, said dispersing being effected by means of f.i. piezoelectric transducers.

Abstract: The invention relates to a protective coating for foundry implements which are in contact particularly with molten aluminium alloys, comprising from 10 to 60 weight parts of extraction oil obtained by deasphalting and dewaxing heavy oils left after the vacuum distillation of crude oil having a kinematic viscosity of from 37 to 53 mm.sup.2.sec..sup.-1 at 100.degree. C. and an open cup flash point of at least 285.degree. C.; further from 5 to 30 weight parts of a mixture of light and middle oils obtained by the vacuum distillation of crude oils having a flash point of at least 150.degree. C. and a viscosity of from 16 to 22 mm.sup.2.sec..sup.-1 at 50.degree. C., from one to 15 weight parts of graphite, or from 0.1 to 5 weight parts of wool fat, and from 0.1 to 3 weight parts of ethoxylated fatty alcohols having from 12 to 18 carbon atoms and from 10 to 20 ethylene oxide units in the molecule, the coating being characterized in that it additionally contains from 20 to 65 weight parts of titanium dioxide.

Abstract: A mold facing for producing a gas-permeable, non-gassing and, in view of its small thickness and its porosity, heat-conductive cladding of a centrifugal ingot mold for copper and its alloy contains pulverulent material in a dispersing agent, particularly water, evaporating without residue. The pulverulent material has titanium dioxide (TiO.sub.2) as the main constituent or the sole constituent, preferable with an average particle sizes of about 15 .mu.m. A process for cladding a centrifugal ingot mold by using such a mold facing contemplates at first preheating the mold and subsequently applying the mold facing by spraying to the inner wall of the centrifugal ingot mold rotating around its axis in form of a suspension free of binding agents and surface active agents as a thin layer of, as far as possible, uniform thickness of preferably 0.1 to 0.3 mm and subsequently evaporating the dispersing sheet of the mold facing without leaving any residue for obtaining a porous layer.

Abstract: A method for the preparation of a mold for use in molding high density information discs includes treating the exposed surfaces of the mold with a solvent to remove any foreign matter therefrom. This step is followed by treating the exposed surfaces of the mold with a cleaning and drying agent to remove any remaining solvent. This is followed by applying a coating of an antistatic agent to the surfaces of the mold. The method is completed by applying a coating of a mold lubricant to the surfaces of the mold.

Abstract: In order to reform or rejuvenate a spent or worn tubular mold used for continuous casting, friction bodies are introduced into the hollow mold compartment following the grinding of the inner surface of such mold compartment, the ends of the tubular mold are closed, the tubular mold and the friction bodies are placed into a relative movement with respect to one another and thereafter the inner surfaces of the mold are galvanically coated.

Abstract: A composition for coating the molding surfaces of molds for casting metal parts comprising an aqueous dispersion containing finely divided zirconia, a colloidal silica composition, finely divided mica, finely divided zircon, finely divided bentonite and, optionally, an inert coloring agent. While capable of protecting the molding surfaces against high temperature molten metal and producing castings having substantially defect-free surfaces, the coating composition provides cleaner castings by partially attaching to the casting and spalling off as the casting cools.

Abstract: A composition in the form of a solution or dispersion which includes a perfluoroalkyl group-containing phosphoric acid ester of the formula(R.sub.f XO).sub.n PO(OH).sub.3-n(wherein R.sub.f represents a perfluoroalkyl group containing from 4 to 20 carbons, X represents a divalent organic residue and n is an integer from 1 to 3) and an additive which is a surface active agent, a silicone oil, a highly fluorinated organic compound, a wax or a mixture thereof, the composition being useful for imparting mold releasing properties to a mold.

Abstract: The base plates or stools of ingot molds used in the casting and teeming of molten steel can be repaired by spraying onto the ingot mold base plate from 2-5 gallons of a composition comprising:______________________________________ Aluminum silicate refractory grain.sup.1 50-80% Al.sub.2 O.sub.3 4.0-17.0% Bentonite clay 0.2-5.0% Binder 4.0-25% 75% phosphoric acid 72-82% Alumina trihydrate 6.2-16.2% Powdered boric acid 1.0-7.0% H.sub.2 O 4.0-14.

Abstract: A process and material for treating metal handling and shaping devies with a material containing sub micron sized particles of graphite in a liquid carrier is described that forms a penetraring and lubricating coating on the metal handling and shaping devices so as to maintain a smooth surface condition capable of resisting adhesion of contaminates thereto and the build up of foreign materials thereon.

Abstract: A method of producing a uniform synthetic coating on a working cast for dental applications which comprises:(A) applying to or introducing in said working cast a first catalyst component which, when initiated by a second catalyst component, effects polymerization of a polymerizable composition;(B) thereafter applying to said working cast said second catalyst component and a polymerizable composition which, when polymerized, forms a resin; and(C) thereafter effecting polymerization of said polymerizable composition to form a film.

Abstract: Carnauba wax is contacted with perchloroethylene which will extract para methoxy cinnamic acid esters. The extracted solution is sprayed into the heated mold cavity. The solvent will evaporate leaving a coating of the para methoxy cinnamic acid ester on the mold.

Abstract: A dispersion composition and a method for coating the surface of steel casting dies for molten metals are described. The dispersion composition comprises boron nitride powder dispersed in a peroxide-modified aqueous dispersion of a water-dispersible film-forming polymer. The coating composition provides thermal insulation to the mold surface, thereby minimizing premature solidification of the cast metal.

Abstract: A composition which possesses both good lubrication and release properties for use in the manufacture of molded rubber articles composed of a mixture of(a) monoalkyl ethers of oxyethylene-oxypropylene copolymers, in which the weight ratio of oxyethylene groups to oxypropylene groups is 25 to 75:75 to 25; and(b) polyoxyalkylene-polysiloxane copolymers in which the components (a) are soluble or dispersible.

Abstract: A process of treating coke oven doors and jambs with a material containing micro micron particles of graphite in a liquid carrier is described that forms a penetrating lubricating adhesive coating on the coke oven doors and jambs which acts to prevent leakage of tar and other coke by-products as heretofore common in the art and the resultant inability of maintaining a sealing relation between the doors and jambs.

Abstract: There are disclosed mold-release compositions suitable for lubricating metal molds which are used in molding natural and synthetic rubber and other polymers. The mold release agents of the invention are oxidation-stable homopolymer and copolymer, i.e., block or heteric polyoxyalkylene lubricant compounds. The lubricants of the invention can be used alone or in mixtures with prior art polyoxyalkylene lubricant compounds. The polyoxyalkylene mold release lubricants of the invention have the formula: ##STR1## R is individually selected from alkyl groups of 1 to about 21 carbon atoms, preferably about 7 to about 21 carbon atoms, and most preferably about 12 to about 18 carbon atoms. In lubricants I and III, R.sub.1 and R.sub.2 are the residue of the same or different and in lubricant II different alkylene units, all individually selected from the group consisting of the residue of ethylene oxide, propylene oxide, butylene oxide and an aromatic glycidyl ether, R.sub.3 is the residue of a difunctional phenol, R.

Abstract: A composition and method for coating the surface of steel casting dies for molten metals are described. The composition comprises a dispersion of boron nitride powder, an elastomeric polymer and an organic solvent or diluent. The elastomeric polymer consists of two fractions, a high-polymer fraction and a low-polymer fraction. The treatment provides thermal insulation to the mold surface, thereby minimizing premature solidification of the cast metal.

Abstract: A dispersion composition and a method for coating the surface of steel casting dies for molten metals are described. The dispersion composition comprises boron nitride powder dispersed in a peroxide-modified aqueous dispersion of a water-dispersible film-forming polymer. The coating composition provides thermal insulation to the mold surface, thereby minimizing premature solidification of the cast metal.

Abstract: Materials suitable for lining vessels designed to hold molten iron or steel are provided herein. These materials are made of burned dolomite, containing 1-6% of a natural glyceride oil or a mixture of such oils and 2-6% by weight of a dry inorganic particulate bonding agent, such as potassium silicate or phosphate.