Evonik Roehm Gmbh

Roehm Gmbh & Co Kg

Evonik Rohm Gmbh

Guenther Dickhaut-Bayer

Christoph Krohmer

Achim Neuhaeuser

Uwe Numrich

Michael Wicker

Markus Parusel

Jann Schmidt

Herbert Groothues

Hans Lorenz

Wolfgang Scharnke

Thorsten Goldacker

Michael Enders

Helmut Haering

Thomas Arndt

Alexander Laschitsch

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 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 present invention relates to a foil encompassing at least one PMMA layer coloured with a yellow anthraquinone dye, where the chromaticity coordinates (x;y) in the CIE 1931 Standard Colorimetric System of the PMMA layer are within the range of 0.4&#x2266;x&#x2266;0.54 and 0.44&#x2266;y&#x2266;0.54, where the concentration of the yellow dye of the PMMA layer is at least 3% by weight, based on the total weight of the PMMA layer.

Weather-resistant film for the yellow coloration of retro-reflective moulded bodies

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

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

Growing community of inventors

Riedstadt, Germany

Guenther Dickhaut-Bayer