Roehm Gmbh Chemische Fabrik

Roehm Gmbh & Co Kg

Evonik Roehm Gmbh

Rohm Gmbh

Roehm Gmbh

Roehm America LLC

Evonik Rohm Gmbh

Markus Parusel

Werner Siol

Jann Schmidt

Herbert Groothues

Erwin Felger

Wilhelm Wopker

Klaus Schultes

Thomas Suefke

Guenther Dickhaut-Bayer

Michael Enders

Helmut Haering

Heinz Vetter

Werner Hoess

Hans Lorenz

Guenter Schmitt

Ghirmay Seyoum

Günter Schmitt

Christoph Krohmer

Wolfgang Scharnke

Claude Guenanten

Guenther Dickhaut

Ralf Richter

Winfried Belzner

Detlef Birth

Thomas Pfaff

Jonas Scherble

Girolamo Musci

Claude Guénanten

Anderson Costa

Michael Golder

Heinz Dieter

Kim Struwe

Gunther Dickhaut

Helmut Häring

Haroldo Rodrigues

Günther Dickhaut

Achim Neuhäuser

Jurgen Pachmann

Jürgen Pachmann

Werner Höss

Thomas Süfke

The present invention relates to novel films for application on materials as protective film in respect of weathering effects. In particular, the present invention relates to a novel film composite which has at least three layers and which features particularly good adhesion on the substrate and particularly good optical properties. The outermost layer here is a layer comprising a fluoropolymer, the middle layer is a PMMA layer comprising at least one UV absorber and/or UV stabilizer, and the innermost layer is a PMMA layer comprising at least one adhesion promoter which improves adhesion on the substrate.

Three-layer UV protective film for decorative laminated sheets (HPL)

Heat resistant brittle films can be made from impact-modified poly(meth)acrylimide, and forgery prevention labels can contain the heat resistant brittle films. The films can be advantageously prepared by extrusion and, depending on the desired purpose, can be designed to be transparent, translucent, or entirely non-transparent, e.g., white. Ideally, the brittle films and the forgery prevention labels containing the brittle films have no intended break points such as slits, perforation, etc.

Forgery prevention labels for high-temperature applications

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 present invention relates to diffuser sheets for LCD applications encompassing at least one light-scattering polymethyl methacrylate layer which comprises a polymethyl methacrylate matrix and also from 0.5 to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical scattering particles (A) whose median size Vis in the range from 0.1 to 40 &#x3bc;m, and whose refractive index differs from that of the polymethyl methacrylate matrix by a value in the range from 0.02 to 0.2, and from 0.5 to 59.5% by weight, based on the weight of the light-scattering polymethyl methacrylate layer, of spherical particles (B) whose median size Vis in the range from 10 to 150 &#x3bc;m and whose refractive index differs from that of the polymethyl methacrylate matrix by a value in the range from 0 to 0.2, 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, and the spherical scattering particles (A) and spherical particles (B) have a different median particle size V, where the transmittance of the diffuser sheets is in the range from 20 to 70% and their scattering power is greater than 0.3, where 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.

Diffuser disk for LCD applications, method for the production and use thereof

The present invention relates to rear-projection screens which have at least one scattering layer encompassing scattering particles and has at least one backing layer, characterized in that the halved-intensity angle of the scattering layer is greater than or equal to 15&#xb0; and the halved-intensity angle of the backing layer is smaller than or equal to 6.5&#xb0;, where the gloss Rof the backing layer is smaller than or equal to 70.

Stable rear projection screen and method for the production thereof

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

Process for preparing bead polymers with an average particle size in the range from 1 to 40 &mgr;M, moulding compositions comprising bead polymer, and mouldings and PAMA plastisols

Moulding compositions with diffusing properties and mouldings obtainable from these

The invention concerns a method for the production of surface coatings from monodisperse poly(meth)acrylate particles, produced by precipitation polymerization in a halogen-free solvent L in the presence of a block copolymer BCP, wherein the poly(meth)acrylate particles are synthesized from at least 60 wt % monomer units M of formula I: ##STR1## wherein R is hydrogen or methyl, and R.sub.1 is an alkyl radical of 1 to 8 carbon atoms, a substituted aryl radical, or an aralkyl radical, wherein the resulting poly(meth)acrylate has a Vicat softening temperature VET according to ISO 306 between 30.degree. and 110.degree. C., and wherein the specific viscosity of the poly(meth)acrylate in chloroform at 25.degree. C., according to DIN 51562, lies between 10 and 150 cm.sup.3 /g. The surface coatings are applied onto the substrate to be coated by application of a dispersion of poly(meth)acrylate particles and solvent L, which is subsequently evaporated, or by a powder coating with the isolated poly(meth)acrylate particles, which are subsequently melted.

Method for the production of coatings

The invention concerns crosslinked plastic particles based on polymethyl (meth)acrylate PP with a particle diameter of 1-15 .mu.m, synthesized from the monomers:

Plastic particles with a high thermostability

The invention relates to a method for the production of poly(meth) acrylate particles with a particle diameter of 1-15 .mu.m, where the monomers M are polymerized according to the method of batch polymerization, with 20-50 parts by weight of monomer M in a liquid medium LM, consisting of 55-100% by weight of mineral oil, and with the addition of 0.1 to 5 parts by weight of a polymer emulsifier E and 0.05-5 parts by weight of a radical initiator.

Method for the production of plastic particles

The invention relates to a method of manufacturing monodisperse poly(meth)acrylates by the method of precipitation polymerization, comprising polymerizing

Method of manufacturing monodisperse poly(meth)acrylate particles

Method of manufacturing monodisperse poly (meth) acrylate particles

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Messel, Germany

Markus Parusel