Abstract: An anti-seismic rubber is made by laminating a plurality of rigid plates and flexible plates having viscoelastic properties alternatively. At least one of the flexible plates A has elasticity, i.e. magnitude of the stress corresponding to an arbitrary strain in a stress-strain curve, lower than the elasticity of other flexible plates B in a low strain zone, and in a high strain zone, elasticity of the flexible plate A is higher than the elasticity of the flexible plate B.

Abstract: A sheet material for covering substrates comprising (a) a carrier layer comprising a polymer selected from polyesterethers, copolyesters and blends thereof, and (b) a tie layer bonded thereto, said tie layer being a low molecular weight polymer containing ethylene repeat units. The sheet material is provided with a decorative and/or protective coating, and preferably, a top coat.

Abstract: By adding an appropriate amount, 1 to 12 weight percent, based on the amount of magnesium oxide present and Loss On Ignition values of powdered magnesium metal to the magnesium oxide aqueous slurry composition used to make a separating-agent composition in the making of grain-oriented silicon electrical steel, there are obtained composition, an article, and a method characterized principally by a substantial decrease in the rate of rejections of the produce of the final texturizing anneal because of coating defects--such difficulties as bare spots, and metal-overlay pattern. Moreover, the magnetic properties may be improved because of improved control of the propagation of the internally oxidized zone of the steel.

Abstract: A weather-, moisture, and gas-resistant radome and laminate for radomes comprising layers of porous expanded polytetrafluoroethylene (EPTFE) membrane, fluorinated thermoplastic membrane, and woven EPTFE textile backing fabric. Superior electromagnetically transmission characteristics, excellent physical and electrical properties.

Abstract: The tape having a surface with a low coefficient of friction consists of a conformable substrate manufactured of polycarbonate or mylar. Rods of alumina, having cylindrical cross section, are adhesively bonded to the substrate. These rods are parallel to each other, spaced apart at regular intervals and oriented lengthwise across the narrow dimension of the tape. The cylinders of alumina are tapered at both ends so that there is a smooth transition at either edge of the tape. The cylinders of alumina having a very low coefficient of friction and an extremely long lifetime, to thereby provide a surface with a low coefficient of friction for the tape transport path of a magnetic tape drive.

Abstract: Fire and chemical resistant, flexible composites are made from flexible woven, non-woven and knitted substrates and fluoropolymer containing films. Adhesives, such as melt adhesives, may be used in making the composites. The composites are suitable for use in protective garments, and in other articles where flexible chemically resistant materials are needed. A seaming technique for use in protective articles is described.

Abstract: A patterned thin film suitable for use in electric and electronic devices, prepared from a polymer or a mixture of the polymer and other known compounds capable of forming a thin film by LB technique, said polymer having linear recurring units wherein an organic group R.sup.1 having at least 2 carbon atoms and a valence of at least 2 is combined alternately with an organic group R.sup.2 having at least 2 carbon atoms and a valence of at least 2 through a bivalent group formed by a reaction of an acid group A containing a hetero atom and a basic group B containing a hetero atom, and wherein a hydrocarbon-containing group R.sup.3 having 10 to 30 carbon atoms which may contain a substituent group, is linked by covalent or ionic bond to said recurring units, the number of groups R.sup.3 being at least 2 per 10 recurring units.

Abstract: A polyester film which is provided with a permanent, antistatic coating on one surface, which coating is obtained by treating the biaxially stretch-oriented and heat-set film with an aqueous dispersion, containing at least one copolyester containing sulfonate groups, and at least one salt derived from an amino acid or a protein hydrolysate and having a diazotype reproduction layer on the opposite surface of the film.

Abstract: Protective coatings are applied to substrate metals by coating the metal surface, e.g. by dipping the substrate metal in a molten alloy of the coating metals, and then exposing the coating at an elevated temperature to an atmosphere containing a reactive gaseous species which forms a nitride, a carbide, a boride or a silicide. The coating material is a mixture of the metals M.sub.1 and M.sub.2, M.sub.1 being zirconium and/or titanium, which forms a stable nitride, carbide, boride or silicide under the prevailing conditions. The metal M.sub.2 does not form a stale nitride, carbide, boride or silicide. M.sub.2 serves to bond the carbide, etc. of M.sub.1 to the substrate metal. Mixtures of M.sub.1 and/or M.sub.2 metals may be employed. This method is much easier to carry out than prior methods and forms superior coatings. Eutectic alloys of M.sub.1 and M.sub.2 which melt substantially lower than the melting point of the substrate metal are preferred.

Abstract: To extend the temperature range of composite materials the composite material is made up of more than two hard layers which are joined with thin intermediate layers of viscoelastic material where one intermediate layer differs from another intermediate layer in that its softening range lies in a different temperature range so that the damping ranges of the intermediate layers also are different.

Abstract: An extruded porous article, which can be prepared by a ram-extruding method, comprising an aggregated aromatic polyimide powder which has a heat loss ratio of not more than 2 wt. %, the heat loss ratio being measured at 360.degree. C. for 1 hour, and a mean particle size in the range of 1 to 40 .mu.

Abstract: A graphic artwork includes a thin film coating layer thereon which includes a copper oxide which is substantially opaque to ultraviolet light and partially transmissive to visible light and suitable for printing circuiting on a printed circuit board or for other graphic artwork. In the case where the thin film compound inlcudes unoxidized copper, etching thereof to achieve a predetermined pattern on the graphic artwork is facilitated by using a mixture of ammonium chloride and hydrogen peroxide.

Abstract: Filled fluorosilicone and filled fluorophosphazene composite films and unfilled fluorosilicone, fluorophosphazene, or copolymers provide atomic oxygen resistance to protect surfaces on spacecraft in low earth orbit. The preferred composite films are generally made by polymerizing suitable precursors on the exposed surfaces, the filler being mixed with the polymer precursors prior to curing. Second surface mirrors can be protected with these films while the flexibility of the mirror is retained.

Abstract: The flexible base materials for printed circuits contain, as an insulator, resins of low thermal expansivity having structural units of the general formula (I) ##STR1## in which Ar.sub.1 is a tetravalent aromatic radical, Ar.sub.2 is ##STR2## R.sub.1 to R.sub.8 are lower alkyl groups, lower alkoxy groups, or halogen atoms, identical with or different from each other, and n1 to n8 are integers of from 0 to 4.The flexible base materials for printed circuits curl very little, and possess sufficient adhesive strength, flexibility and dimensional stability.

Abstract: Corrosive resistant, coated laminate consisting of metal substrate, anti-corrosive layer and paint layer, which is characterized by the fact that the anti-corrosive layer is formed by a composition containing, as essential components, at least one hexa-valent chromium containing chromium compound having a solubility of 20 to 10.sup.-5 and aqueous silica and/or aqueous resin as binder, and as optional component, a water soluble chromium compound having a solubility of more than 20, and the paint layer is free from chromium compound. The laminate is excellent, inter alia, in adhesion of coating and anti-corrosive property. The invention also provides a coated metal plate hving excellent corrosion resistance and continuous spot weldability.

Abstract: A thermoformable laminate comprising (1) a polyaryletherketone sheet having repeating units derived from diphenyl ether having attached to one of the phenyl rings either a 1,4-phenylenedicarbonyl group or a 1,3-phenylenedicarbonyl group, the ratio of 1,4-phenylenedicarbonyl groups to 1,3-phenylenedicarbonyl groups being 70:30 to 0:100, preferably 60:40 to 0:100, especially 60:40 to 50:50, the sheet thickness being about 625-5000 micrometers, and (2) a polyvinyl fluoride film having a thickness of about 12.8 to 204 micrometers can be thermoformed at a temperature of about 160.degree.-200.degree. C., especially 170.degree.-195.degree. C. One important application of such thermoformable sheets is in fabricating three-dimensional panels for aircraft interiors.

Abstract: An aromatic polyimide film having a metallic surface comprises a substrate film of an aromatic polyimide containing essentially no inorganic particle, an aromatic polyimide resin layer containing non-conductive metal oxide particles dispersed therein and a metal layer, superposed in order. A portion of the non-conductive metal oxide particles located in the vicinity of the surface of the aromatic polyimide resin layer is reduced into metal so that the surface of the resin layer is made electroconductive.

Abstract: An adhesive system having a pressure-sensitive adhesive matrix and dispersed therein particulate solids wherein the adhesive system has a light transmission within the range of 15 to 80 percent transmission, and preferably 25 to 75 percent transmission. The adhesive system may include a coating of untilled pressure sensitive material. The particulate solids preferably have a particle size no greater than 300 microns, and may be organic particulate solids, preferably certain polymeric compositions.

Abstract: A heat insulating structure of ceramic material for high temperatures is made up of a plurality of reflective layers in order to provide protection against the action of heat for short periods of time. The reflective layers are made up of a substrate of impregnated, fired ceramic fiber and a noble metal layer. The heat insulating structure is made up of a plurality of such parallel spaced reflective layers.

Abstract: The invention relates to a sheet moulding compound (SMC) comprising a basic layer consisting of thermosetting material, fillers, fibres and customary additives, one side of which is provided with two layers, an intermediate layer and a top layer, the intermediate layer of which lies against the basic layer, the intermediate layer comprising at least fibre reinforcement and thermosetting material in a partly cured state and the top layer comprising the same or a different thermosetting material, which is in a cured state to a smaller extent than the first layer. The invention relates also to a sheet-shaped product that can be applied as an upper layer for a moulding compound like a SMC, BMC and DMC, that consists of the above described intermediate layer and top layer.