Evonik Roehm Gmbh

Roehm Gmbh & Co Kg

Evonik Rohm Gmbh

Rohm Gmbh

Ensinger Gmbh

Christoph Krohmer

Uwe Numrich

Guenther Dickhaut-Bayer

Achim Neuhaeuser

Michael Wicker

Herbert Groothues

Thomas Arndt

Michael Meier-Kaiser

Markus Parusel

Hans Lorenz

Jann Schmidt

Norbert Brand

Thorsten Goldacker

Wilfried Ensinger

Claude Guenanten

Helmut Haering

Detlef Birth

Lena Stiehl

Walter Meon

Christopher Neuroth

Alexander Laschitsch

Norbert Deusch

Christoph Steinfels

Frank Richter

Guido Lange

Achim Neuhäuser

Günther Dickhaut-Bayer

Armin Götz

Lothar Meyer

Claude Guenaten

A method for manufacturing insulating bars made from a thermoplastic material, comprising: producing a band-shaped extrudate having a substantially rectangular cross-section from the thermoplastic material; producing an individual insulating bar or a plurality of insulating bars from the band-shaped extrudate in the longitudinal direction thereof; and severing the insulating bar or bars arrangement in the longitudinal direction thereof to provide separated insulating bars.

Method for manufacturing an insulating bar

The present invention describes a process for the surface finishing of materials via application of specific polymethacrylate layers. The polymethacrylate layers are composed of blends of at least two (co)polymers of polymethacrylates, and specific 'reactive monomers' are present here in a polymerized mixture which forms the polymethacrylate layer. At the application temperature established, these form a chemical and, where appropriate, also a physical bond to the substrate, and therefore have adhesion-promoting action.

Method for surface hardening substances by application of particularly transparent polymethacrylate layers

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

The invention relates to a novel UV-protective and weather-resistant package for surface protecting films for polyvinyl chloride window profiles made of poly(meth)acrylate. Matrix plastics having great molecular weights are used in order to obtain great weather resistance of the surface protecting films.

PMMA film featuring particularly great weather resistance and great UV protection

The invention relates to a molded body consisting of plastic with a material thickness of at least 150 $g(m)m at any point. Said body contains a polymer mixture of an impact-resistance modified poly(meth)acrylate plastic, a polymethyl methacrylate matrix, elastomer particles contained in said matrix and a fluoropolymer. According to the invention, the fraction of the fluoropolymer in the mixture is between 30 and 95 wt. % and the polymer mixture of the impact-resistance modified poly(meth)acrylate plastic and the fluoropolymer is present in an outer layer with a continuous material thickness of at least 10 $g(m)m. The invention is characterized in that the impact-resistance modified poly(meth)acrylate plastic consists of between 20 and 70 wt. % poly(meth)acrylate matrix and between 30 and 80 wt. % elastomer particles.

Polymer mixture consisting of an impact-resistance modified poly (meth) acrylate and a fluoropolymer

The present invention relates to a rear-projection screen encompassing at least one light-scattering polymethyl methacrylate layer, which comprises a polymethyl methacrylate matrix and spherical scattering particles (A) and spherical particles (B) with a different median particle size V, where the spherical scattering particles (A) have a median size Vin the range from 0.1 to 40 &#x3bc;m, the difference between the refractive index of the spherical scattering particles (A) and that of the polymethyl methacrylate matrix being in the range from 0.02 to 0.2, where the spherical particles (B) have a median size Vin the range from 10 to 150 &#x3bc;m, the difference between the refractive index of the spherical particles (B) and that of the polymethyl methacrylate matrix being in the range from 0 to 0.2, and where the total concentration of the spherical scattering particles (A) and particles (B) is in the range from 1 to 60% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, where the concentration of the spherical scattering particles (A) c, the thickness of the light-scattering polymethyl methacrylate layer dand the size of the spherical scattering particles (A) Dis selected in such a way that the ratio c*d/Dis in the range from 0.001 to 0.015% by weight*mm/&#x3bc;m, the concentration of the spherical particles (B) c, the thickness of the light-scattering polymethyl methacrylate layer dand the size of the spherical particles (B) Dis selected in such a way that the ratio c*d/Dis in the range from 0.000005 to 0.002% by weight*mm/&#x3bc;mand the ratio of the square of average surface roughness of the polymethyl methacrylate layer Rto the third power of the size of the spherical particles (B) R/Dis in the range from 0.0002 to 0.1300 &#x3bc;m.

Scratch-resistant rear projection screen and method for producing the same

The invention relates to a solid body of plastic, glass, ceramic or metal which has at least partially a microstructured surface with rows oriented in a preferential direction of cross-sectionally trapezoidal or wedge-shaped ridges, wherein the ridges have minima and maxima in height (H) which lie in the range from 0 mm to 2 mm, and the minima and maxima follow one another periodically with amplitudes in the range from 0.005 to 20 mm, and the spacing of the rows of neighboring ridges in relation to one another is 0.002 mm to 5 mm, it being possible for the valleys between the rows to be planar, curved or tapered, and the cross-sectionally trapezoidal or wedge-shaped ridges have a wedge angle (&#x3b1;) in the range from 15 to 75&#xb0;.

Solid body with microstructured surface

Growing community of inventors

Stockstadt, Germany

Christoph Krohmer