Patents Assigned to Roehm GmbH @$amp; Co. KG
  • Publication number: 20060018015
    Abstract: Abstract of the Disclosure The present invention relates to rear-projection screens encompassing at least one light-scattering polymethyl methacrylate layer of thickness in the range from 0.05 to 4 mm comprising spherical particles whose size is in the range from 5 to 35 µm, at a concentration in the range from 2 to 60% by weight, based on the total weight of the light-scattering polymethyl methacrylate layer, the refractive index of the spherical plastics particles differing from that of the polymethyl methacrylate matrix by a value in the range from 0.02 to 0.2, wherein the concentration of the spherical plastics particles cP, the thickness of the light-scattering polymethyl methacrylate layer dS, and the size of the spherical plastics particles DP is selected in such a way that the ratio cP*dS/DP3 is in the range from 0.0015 to 0.015% by weight*mm/µm3 and the ratio of average surface roughness of the polymethyl methacrylate layer Ra to the size of the spherical plastics particles Dp is in the range from 0.
    Type: Application
    Filed: May 21, 2004
    Publication date: January 26, 2006
    Applicant: Roehm GmbH @$amp; Co. KG
    Inventors: Markus PARUSEL, Jann SCHMIDT, Herbert GROOTHUES, Wolfgang SCHARNKE, Hans LORENZ, Helmut HAERING, Guenther DICKHAUT-BAYER