Bayer Aktiengesellschaft

Bayer Materialscience Ag

Sony Corporation

Bayer Intellectual Property Gmbh

Covestro Deutschland Ag

Bayer Antwerpen N.v.

Technische Hochschule Nürnberg Georg Simon Ohm

Covestro Intellectual Property Gmbh & Co. Kg

Technische Hochschule Nuernberg Georg-simon-ohm

Wilfried Haese

Friedrich-Karl Bruder

Rafael Oser

Horst Berneth

Wolfgang Ebert

Serguei Kostromine

Rainer Hagen

Josef-Walter Stawitz

Thomas Bieringer

Peter Landenberger

Thomas Sommermann

Alexander Meyer

Karin Hassenr&uuml;ck

Ralf Pakull

Karin Hassenrück

Ice Zhang

Raymond Wong

Rolf Dhein

Wolfgang Fischer

Burkhard Kohler

Gerhard Fennhoff

Michael Prein

Hermann Kauth

Karlheinz Hildenbrand

Stephan Konrad

Uli Franz

Rainer Protte

Michael Roppel

Stefan Westernacher

Helmut Einberger

Rolf Wehrmann

Rolf-Volker Meyer

Masanobu Yamamoto

Jan Weikard

Wilfried Zecher

Jurgen Kirsch

Siegfried Anders

Peter Fischer

Aziz El-Sayed

Wolfgang Alewelt

Hidetoshi Watanabe

Hermann Perrey

Henning Giesecke

Helmut-Martin Meier

Michael Ludewig

Rainer Neumann

Ralf Hufen

Yuichi Sabi

Christian Kords

Frieder Heydenreich

Alexander Karbach

Wolfgang Nising

Sakuya Tamada

Silke Kratschmer

Steffen K&uuml;hling

Tony Van Osselaer

Günther Walze

Ulrich Blaschke

Takashi Iwamura

Joachim Genz

Rolf Lanze

Udo Wolf

Wolfgang Russeler

Mitsuaki Oyamada

Gunther Stollwerck

Lothar Bunzel

Annett K&ouml;nig

Roland Vogelsgesang

Hans-Josef Behrens

Hartmut Lower

Martin D&ouml;bler

Gerhard-Dieter Wolf

Bert Ruytinx

Franky Bruynseels

Dirk Van Meirvenne

Gunter Schmidt-Kastner

J&uuml;rgen R&ouml;hner

Marco Roelofs

Wolfgang Calaminus

Steffen Kühling

Peter Egerer

James Mason

Raimund Zimmermann

René De Cleyn

Claus-Ludolf Schultz

Martina Brandt

Franziska Hanne Brandt

Inken Margarethe Brandt

Thomas Föllinger

Stefaan De Vos

Hartmut L Ower

Ralf Kaufmann

J&uuml;rgen Stebani

J Urgen Kirsch

Friedrich Bruder

Andreas Frankenau

Dieter Rühle

Alena Taranka

Jörg Wehrle

Matthias Voetz

The present invention relates to a projection spotlight module comprising a reflector with a first focal point and a second focal point, a light source which is disposed at the first focal point of the reflector or close to the first focal point of the reflector, a lens that has its focal point in common with the second focal point of the reflector, and a stop system with color filters for reducing color fringing. Projection spotlight modules according to the invention are especially suited for illumination in the automotive sector, of utility vehicles, of rail vehicles, of two-wheeled vehicles, of ships, in particular as headlights, as theater spotlights or as architectural lightings, for instance in the illumination of facades.

Device for reducing color fringing

This invention relates to DVDs made from polycarbonate and a special UV curable bonder material consisting of A) an urethane acrylate oligomer as binder, which is the reaction product of i) one or more polyisocyanates and ii) one or more hydroxyfunctional lactone ester (meth)acrylates having a number average molecular weight of from 200 g/mol to 2000 g/mol and having the formula: CH&#x2550;C(R)&#x2014;C(O)&#x2014;O&#x2014;R&#x2014;[O&#x2014;C(O)&#x2014;R]&#x2014;OH wherein, n is an integer from 1 to 5, Ris hydrogen or methyl, Rrepresents an alkylene group or substituted alkylene group having from 2 to 10 carbon atoms and Rrepresents a straight or branched chain alkylene group of from 3 to 8 carbon atoms, and which may be substituted with one or more alkyl groups having from 1 to 12 carbon atoms, B) a reactive thinner, comprising of mono functional acrylates and/or (meth)acrylates C) a photo initiator and D) optional additives which offers improved performance at high data transfer rates.

High speed DVDs

This invention relates to an optical recording medium in which at least a recording layer and a light transmitting layer are sequentially formed on a substrate and in which the light is illuminated from the light transmitting layer side for recording and/or reproducing information signals, said substrate comprising an injection molded part, and said substrate having a Young's modulus E of at least 2.15 GPa and a Q factor of lower than 160 measured at 25&#xb0; C. at 2000 Hz in accordance to ASTM E 756-05 05 and a transcriptability of the pit/groove structure of &#x3e;85%.

Disc shaped high density recording medium

This invention relates to the use of polycarbonate for the production of an optical recording medium in which secure high speed operation, a transcriptability of the pit/groove structure of &#x3e;85% and sufficient disc flatness can be achieved and the polycarbonate is based on bisphenol A and the polycarbonate contains a release agent in an amount less than 2000 ppm.

Substrate material for high speed optical discs

Optical recording mediums comprising a substrate and a recording layer and a light transmitting layer sequentially disposed on the substrate; wherein the substrate comprises one or more parts selected from the group consisting of injection molded parts, injection molded sandwich structures having a molded surface layer and a molded core layer or two injection molded parts which are UV-bonded, and combinations thereof; and wherein the substrate has a Young's modulus E of at least 2.15 GPa and a Q factor of lower than 160 measured at 25&#xb0; C. at 2000 Hz in accordance to ASTM E 756-05.

Disc-shaped high-density recording mediums

The invention provides a process for the preparation of polycarbonate by the melt transesterification process, polycarbonate having a low electrostatic charge obtainable by this process, and moldings or extrudates, in particular optical data storage media or light-diffusing plates, made from this polycarbonate.

Process for the preparation of polycarbonate by the melt transesterification process

The present invention provides a polycarbonate resin produced by the continuous interfacial process characterized in that after alkaline hydrolysis with sodium hydroxide, the polycarbonate resin contains an amount of 0.01 to 150 ppm of carbamate compounds according to formula (1) said amount measured by high pressure liquid chromatography, wherein Rand Rindependently of one another denote hydrogen or C-C-alkyl, or together denote C-C-alkylidene, and Rand Rindependently of one another denote hydrogen. C-C-alkyl or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, the process comprising phosgene reacting with at least one bisphenol at 8 to 17% molar excess of phosgene relative to the bisphenol.

Polycarbonates with good wettability

An improvement to the phase interface process of preparing aromatic polycarbonate is disclosed. The process is characterized in that the phosgenation is carried out at 0 to 40&#xb0; C., and in that the temperature of the reaction mixture at the time of addition of the catalyst at 10 to 40&#xb0; C., and in that the molar ratio of aromatic dihydroxy compounds to phosgene at 1:1.05 to 1:1.20. The polycarbonate thus produced is characterized in its low content of carbamates, making it particularly suitable for the preparation of optical storage media.

Process for the preparation of polycarbonates

The present invention relates to a multilayer, surface structured solid plate for light guidance, the base material of which consists of a transparent plastic material, and optionally one or more cover layers.

Light-guiding surface structure

Polycarbonate resin containing small amounts of carbamate compounds is disclosed. The resin that contains at least one of compounds conforming to whereinRand Rindependently of one another denote hydrogen or C-C-alkyl, or together denote C-C-alkylidene, Rand Rindependently of one another represent hydrogen, C-C-alkyl, or phenyl, or together with the carbon atom to which they are bonded form cyclohexyl or trimethylcyclohexyl, and Rdenotes hydrogen, C-C-alkyl, C-C-cycloalkyl, phenyl or cumyl, are characterized by their low electrostatic field and therefore suitable for making optical storage media.

Polycarbonates having a good wettability

Optical data carrier comprising a preferably transparent substrate which may, if desired, have previously been coated with one or more reflection layers and to whose surface a light-writeable information layer, if desired one or more reflection layers and if desired a protective layer or a further substrate or a covering layer have been applied, which can be written on or read by means of blue, red or infrared light, preferably laser light, where the information layer comprises a light-absorbent compound and, if desired, a binder, characterized in that at least one cyanine dye is used as light-absorbent compound.

Optical data carrier comprising a cyanine dye as light-absorbent compound in the information layer

An optical fiber that contains a core of polycarbonate and a coating is disclosed. The coating is a polymer that contains structural units conforming to specified formulae. Also disclosed is a process for producing the inventive fibers and their use for transmitting optical signals.

Optical fibers

An optical recording medium having at least a recording layerand a light transmitting layerformed on a substrate, in which the recording layeris made of an organic material for absorbing an incident light of wavelength of 360 nm to 460 nm, and inducing physical change or chemical change to vary the refractive index, the light transmitting layeris 10 &#x3bc;m to 177 &#x3bc;m in thickness, the relation between absorption coefficient 'k' and pyrolysis temperature Tof organic material is950(&#xb0; C.)&#x3c;(Tdec (&#xb0; C.)&#x2212;20)/k&#x3c;4100&#xb0; C.&#x2003;&#x2003;(1),and the absorption coefficient 'k' is k&#x3e;0.0.

Optical recording medium

A thermoplastic molding composition especially suitable for preparing optical data carriers is disclosed. The composition contains polycarbonate resin, at least one mold release agent and at least one phosphite having a defined structural formula. The optical data carriers include compact discs, video discs, digital versatile discs and further optical data carriers which may be written and erased one or more times.

Polymer mixtures

The invention relates to an optical data carrier having a preferably transparent substrate that has optionally previously been coated with one or more reflection layers and to the surface of which has been applied a light-writeable information layer, optionally one or more reflection layers, and optionally a protective layer or a further substrate or a covering layer, such that the optical data carrier can be written on or read by means of blue light (preferably laser light having a specified wavelength) or by means of infrared light (preferably laser light having a specified wavelength), wherein the information layer contains

Optical data carrier comprising a phthalocyanine dye as light-absorbent compound in the information layer

Growing community of inventors

Odenthal, Germany

Wilfried Haese