Roehm Gmbh & Co Kg

Rohm Gmbh

Roehm Gmbh Chemische Fabrik

Rohym Gmbh

Evonik Rohm Gmbh

Hans Lichtenstein

Guenther Ittmann

Manfred Krieg

Ludwig Hosch

Jann Schmidt

Eduard Albrecht

Silvia Ebert

Herbert Groothues

Damian Machert

The invention relates to a moulding composed of a plastics matrix composed of a transparent plastic, comprising a soluble fluorescent dye and a scattering agent whose refractive-index difference from the plastics matrix is +/&#x2212; from 0.003 to 0.2, characterized in that a white pigment whose refractive-index difference from the plastics matrix is from +0.4 to 1.5 is also present, at a concentration of from 0.001 to 0.1% by weight.

Plastic molded body containing a fluorescent dye

The invention relates to an illuminative device essentionaly comprising a light source and a diffusing cover which is assigned to the light source and is made of colored plastic. The light source consites of one or several light-emitting diodes (LEDs) emitting a colored an substantially monocromatic light. The diffusing cover assigned thereto has a transmition (DIN 5036) of at least 35% and a reflection (DIN 5036) of at least 15% with the wavelength of the light-emitting diode operating at relative maximum energy.

Illuminative device

The present invention relates to a light-guide body, which has at least one light-entry surface and at least one light-exit surface, the ratio of the light-exit surface area to the light-entry surface area being at least 4, comprising at least one light-guiding layer with a thickness of at least 2 mm, characterized in that the light-guiding layer comprises at least 60% by weight, expressed in terms of the weight of the light-guiding layer, of polymethyl methacrylate and from 0.001 to 0.08% by weight, expressed in terms of the weight of the light-guiding layer, of spherical barium sulphate particles with an average diameter in the range of from 0.3 to 20 &#x3bc;m.

Light-guide body and process for its production

The invention relates to light-scattering polymethacrylate resins with high heat- and weather resistance, which resins may optionally be colored with dyestuffs or pigments. The desirable properties are achieved by addition of a combination of:

Light-scattering translucent polymethacrylate molded articles with good

Color concentrates comprising a colorant such as a pigment and a polymeric binder, and polymeric binders therefor, said polymeric binders comprising:

Acrylate resins as binders for color concentrates

Opaque tinted acrylic glass produced with organic pigments or with organic dyes, which in addition to the colorant, also contains an acid in the polymer matrix, exhibits improved resistance to weathering.

Tinted plexiglass with organic pigments

Color concentrates comprising a colorant such as a pigment and a polymeric binder and polymeric binders therefor, said polymeric binders comprising:

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Reinheim, Germany

Hans Lichtenstein