An optical record and reproduction apparatus, in which a light beam generated by a light source is concentrated onto an information recording medium by a focusing device, and the light beam reflected by the information recording medium is detected by a light detector to obtain a tracking error signal. A liquid crystal panel having a transparent electrode aligned in a striped form and a polarizing ...

Bead-form, antistatic, expandable styrene polymers containing   a) a styrene polymer,   b) from 0.5 to 3% by weight, based on a), of a coating containing   b1)from 10 to 70% by weight of finely divided silica,   b2)from 20 to 80% by weight of a hydroxyl-containing quaternary ammonium salt and, if desired,   b3)from 0.05 to 20% by weight of a conventional adhesion promoter and   b4)from 1...

A process for the production of polarising films based on a polyvinyl alcohol-polyacetylene graft copolymer containing from 0.01 to 15% by weight of acetylene, by application of a solution of the graft copolymer by means of a metering pourer onto a base film moved past the point of application, removal of the solvent, peeling of the graft copolymer film off the base film, and stretching the graft ...

Apparatus and method are disclosed for encoding information and recording same as sets of variably spaced related marks stored in wavelength (color) and/or depth selective layers on an optical record (10). The encoded information is read by illuminating each set of such recorded marks selected by wavelength (color) or focal depth with a coherent read light to cause an optical interference pattern ...

Polyurethane/expanded porous polytetrafluoroethylene composite coatings show unexpectedly high resistance to ionizing radiation when they contain a hindered phenol.

This invention consists of a composition useful for preparing a cellulose ester membrane comprising (1) a cellulose ester, (2) glycerol monoacetate, glycerol diacetate, glycerol triacetate, or mixtures thereof, and (3) optionally glycerol, wherein the cellulose ester membrane prepared from said composition is useful for a membrane liquid separation process such as microfiltration, ultrafiltration,...

The present invention relates to a method for growing diamond on a diamond substrate by chemical vapor deposition. The inventive method comprises alternatingly contacting at elevated temperature said diamond substrate with a gas having the formula CnXm and then with a gas having the formula ClZp. X and Z each form single bonds with carbon. X and Z also are reactable to form ZX or a derivative ther...

Expandierbare Styrolpolymerisate mit Expandierbarkeit, enthaltend a) ein Styrolpolymerisat mit einer Viskositätszahl, gemessen in Toluol, zwischen 55 und 80 [ml/g] und einem Schmelzindex MFI (190°C, 3,8 kp) zwischen 7,5 und 30 [g/10 min], b) 1 bis 10 Gew.-%, bezogen auf a), eines C3- bis C6-Kohlenwasserstoffs als Treibmittel, sowie gegebenenfalls, c) übliche Hilfsmittel in wirksamen Mengen.; Expan...

A method for manufacturing expandable styrene type polymer particles is disclosed, which comprises the steps of adding a styrene type monomer to styrene type polymer seed particles suspended in an aqueous dispersing medium, continuously or intermittently to be polymerized while being absorbed thereby, and impregnating the resulting polymer particles with an easily volatile blowing agent to obtain ...

Expandierbare Styrolpolymerisate, enthaltend a) ein Styrolpolymerisat, b) 1 bis 10 Gew.%, bezogen auf a), eines gesättigten C3- bis C6-Kohlenwasserstoffs als Treibmittel und gegebenenfalls, c) übliche Hilfsstoffe in wirksamen Mengen, dadurch gekennzeichnet, daß der Benzolgehalt weniger als 1 ppm und der Styrolgehalt weniger als 2000 ppm beträgt.; Expandable styrene polymers, containing   a) a s...

Disclosed is a process for producing powder aggregate particle of high molecular weight polycarbonate resin which comprises adding a non-solvent to a solution containing 3 to 8% by weight of high molecular weight polycarbonate resin having a viscosity average molecular weight of at least 70,000 in a solvent in a ratio of the non-solvent to the solution of the polycarbonate resin of 0.2 to 0.6 by v...

Disclosed is a spring brake cylinder for use on motor vehicles. The cylinder is actuated to a release position in response to fluid pressure. The cylinder includes a spring actuator inserted between the brake cylinder base and a spring brake piston. A tensioning device is provided which mechanically acts upon the spring brake piston and facilitates adjustment of the distance between the spring bra...

The invention relates to a device for improving the stability of rotation of the rotor of a single-phase synchronous motor mounted in an apparatus housing. The motor exhibits an average motor torque on which strong alternating torques are superimposed and which drives a preferably rotating load. The rotating load may be a small domestic appliance such as a citrus-juice extractor, a knife sharpener...

Water from a source is delivered to an influent pipe connected to a reaction vessel, which is also fed, at a predetermined location, with an oxidant, and a fluid treatment chemical agent which is fed to the vessel at a location adjacent an agitator. An effluent discharge pipe is connected to the vessel, fluid being guided in the vessel, during treatment from the influent to the effluent pipe.

A brake actuator has a body (8) containing a pair of brake-applying members (l0, ll) which may be actuated hydraulically to separate the friction elements of a brake into engagement with a rotatable braking surface. The members (l0, ll) are interconnected by a mechanism in the form of a shaft (l2) of which respective end portions (l3, l4) are provided with reversible threaded portions of opposite ...

Porous cross-linked polyvinyl alcohol particles used for a chromatographic medium are prepared by: dispersing an aqueous solution of a mixture of polyvinyl alcohol and a salt in an organic solvent; allowing a gel to form spontaneously from the dispersion; and reacting the gel with a cross-linking agent.

Tack-free silicone gel moldings and methods of making such moldings are prepared by coating tacky silicone gel moldings with a silicone rubber particles, silicone resin particles, inorganic particles, and/or organic resin particles having an average diameter less than about 1 mm.

A polymer latex for making gloves or the like having excellent donning and doffing characteristics comprises a carboxylated open chain aliphatic diene. acrylonitrile/(meth)acrylate copolymer. Latex articles having a skin-contacting surface of the copolymer are produced by dipping formers in the latex.

An apparatus for slit radiography comprising an X-ray source (1), an X-ray detector (6) positioned behind a body (L) being irradiated, said detector collecting the radiation passed through the body, and a slit diaphragm (2) placed between the X-ray source and the body being irradiated, through which diaphragm there is formed a planar X-ray fan beam (4), while for obtaining a complete X-ray shadow ...

A colored steel sheet having a coating thickness which is sufficiently small to permit welding therethrough, and yet exhibiting an excellently colored and lustrous surface. It is a steel sheet having a surface plated with zinc or a zinc alloy, and carrying a chromate film formed on its plated surface, and a colored film formed on the chromate film from a composition comprising specific proportions...