Bayer Aktiengesellschaft

Bayer Aktiengesellschaft Ag

Hans-Leo Weber

Werner Waldenrath

Dieter Freitag

Bernhard Schulte

Uwe Claussen

Volker Serini

Uwe Hucks

Claus Burkhardt

Hans Kaloff

Hellmut Hannes

Hans-Josef Fausten

Peter Bier

Klaus Meyer

Joachim Wank

Eckart Reese

Werner Tischer

Heinz-Jurgen Dziurla

Hans-Wolfgang Schmoranzer

Udo Hansel

Jurgen Schmitz

A dielectric capacitor having self healing properties is disclosed. The capacitor includes a film made of an amorphous aromatic copolycarbonate having a weight average molecular weight of at least 10,000 and a glass transition temperature of at least 160&#xb0; C. In a preferred embodiment the copolycarbonate includes structural units derived from bisphenol TMC. Also disclosed is a process for making the film.

Film as a dielectric in capacitors and process for its production

The present invention relates to antistatic extruded polycarbonate sheets produced from thermoplastic polycarbonates, polyalkylene terephthalates and carbon black, as well as processes for the production of such sheets.

Antistatic extruded polycarbonate sheets

Films from aromatic polyesters and from aromatic polyestercarbonates are excellently suitable for preparing printing ribbons, in particular for thermal and electrothermal recording processes.

Printing ribbon comprising polycondensates

A method for manufacturing printed electrical circuits which comprise a substrate and copper foil applied thereto by hot embossing in a predetermined circuit pattern, said method comprising

Process for the manufacture of printed circuits

Films from aromatic polyesters and from aromatic polyestercarbonates are excellently suitable as electrically insulating films, for example as dielectric for capacitors and as conductor track films.

Use of films of polycondensates

Polyesters having at least 90%, by weight, of recurrent structural units corresponding to the following formula: ##STR1## and characterised by a relative viscosity.eta..sub.rel of from 1.6 to 4.5 (determined at 25.degree. C. in CH.sub.2 Cl.sub.2, c=5 g/l) are suitable for the production of films having highly advantageous performance characteristics, in particular high heat resistance.

High molecular weight polyesters, preparation and use thereof

Optically monoaxial film of plastic which is coated with a product formed by hardening a mixture of a prepolymer, containing at least two (meth)acryloyl groups, and a (meth)acrylic acid ester of a monohydric or polyhydric aliphatic alcohol and/or an aliphatic vinyl compound, and the use of this film in liquid crystal visual displays.

Coated optically isotropic or monoaxially film of plastic

An optically virtually isotropic plastic film, in particular for use in liquid crystal displays, can be produced by a method in which first an optically uniaxial birefringent plastic film is produced by casting or extrusion, and then irreversible molecular reorientation is produced in layers of the film close to the surface by heating or by immersion in a solvent or swelling agent. This reoriented structure is retained after cooling or drying of the film, and results in the birefringence (anisotropy) initially present being eliminated or compensated.

Process for the production of plastic films having improved optical

The present invention relates to polycarbonate laminates consisting of an electrically conductive polycarbonate layer (A) containing carbon black or graphite, and an electrically insulating polycarbonate layer (B), their preparation and their use in the electrical sector.

Electrically conductive polycarbonate laminates and their preparation

Birefringence-free arrangement of plastic foils, characterized in that two plastic foils having a single principal optical axis, said optical axis lying within the plane of the plastic foil, are arranged parallel behind each other so that the optical axes of both plastic foils are forming an angle of 90.degree..+-.7.degree. and the material of the foils with regard to its optical properties and the thickness of the foils being selected in such a manner that the optical path differences .DELTA.n.sub.1 D.sub.1 for the light waves which are associated with the two main refraction indices within the first plastic foil is approximately equal to the optical path difference .DELTA.n.sub.2 d.sub.2 of the second plastic foil, .DELTA.n.sub.1, .DELTA.n.sub.2, being the difference of the main refraction indices in the first and second foil, respectively, and d.sub.1, d.sub.2 standing for their thicknesses, and the use of said arrangement in components and devices in which polarized light is used, especially in liquid crystal displays.

Birefringence-free plastics

Mixtures of polyaryl sulphones and polycarbonates solutions made stable by the introduction of solubilizing agents are used to prepare cast films of improved properties.

Growing community of inventors

Rommerskirchen, Germany

Hans-Leo Weber