Evonik Roehm Gmbh

Rohm Gmbh

Roehm Gmbh & Co Kg

Helmut Haering

Herbert Groothues

Markus Parusel

Jann Schmidt

Michael Meier-Kaiser

Hans Lorenz

Christoph Krohmer

Wolfgang Scharnke

Michael Enders

Guenther Dickhaut-Bayer

Claude Guenanten

Guenther Dickhaut

Wangelis Karampougioukis

Thomas Pfaff

Detlef Birth

Berthold Schoenig

Walter Meon

Stephan Neumayer

Christoph Steinfels

Christopher Neuroth

A process for producing a light guide plate includes producing a colorless transparent sheet from a colorless transparent material by extrusion with a polishing stack. A printed reflector film is laminated in-line to the colorless transparent sheet. The printed reflector film includes: a thermoplastic reflector film which is opaque white or translucent white and made of a thermoplastic material; and a colorless thermoplastic printed on the thermoplastic reflector film. There is no direct optical contact between the colorless transparent sheet and the thermoplastic reflector film. A glass transition temperature of the printed colorless thermoplastic is above 25&#xb0; C. and below glass transition temperatures of the colorless transparent material of the colorless transparent sheet and of the thermoplastic material of the thermoplastic reflector film.

Light guide plate and method for the production thereof

The present invention relates to a method for producing light guide bodies and to their use in lighting units, for example for liquid crystal displays or for monitors. In particular, the present invention relates to a method for producing light guide bodies which have a thickness of at most 1 mm and contain at least 80 wt % of polymethyl methacrylate and no light-scattering constituents.

Method for producing light guide bodies and use thereof in lighting unit

The invention relates to a method for producing a thermoplastic plastic film. According to said method, the thermoplastic plastic is melted and transported in an extrusion installation comprising an extruder, an extrusion nozzle with a wide-slot delivery opening and a chill roll, which is fixed to a roll system and then leaves the delivery opening of the extrusion nozzle in the form of a flat melted web. Said melted web is then applied to the chill roll and is cooled. The invention is characterised in that it uses an extrusion installation, in which the distance between the delivery opening of the extrusion nozzle and the surface of the cooled roll does not vary by more than +/&#x2212;50 &#x3bc;m during the operating time. The invention also relates to a film of this type and to uses of the latter.

Method for producing a thermoplastic plastic film, film and use thereof

A rear-projection screen that has at least one light-scattering polymethyl methacrylate layer in which is embedded spherical plastic particles; the previously described rear-project screen that has an additional plastic sheet that does not have embedded scattering beads; and a method of making a rear-projection screen.

Rear projection screen and method for the production thereof

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Reinheim, Germany

Helmut Haering