Rohm Gmbh

Rohm Gmbh Chemische Fabrik

Roehm Gmbh & Co Kg

Norbert Rau

Manfred Krieg

Werner Ude

Thomas Rhein

Werner Geyer

Joachim Wendorff

Manfred Eich

Sabine Servaty

Juergen Omeis

Manfred Brehm

Michael Kunesch

Hartwig Droegemueller

The invention relates to a method for producing block-shaped and plate-shaped polymethacrylimide foamed materials by copolymerizing methylacrylic acid and methylacryl nitrile, by subjecting the copolymerizate to a post-polymerization and cyclization in order to form polyimide, and by converting the same into a foamed material. The invention is characterized in that the copolymerization is carried out in the presence of a mixture containing at least three initiators with graduated half-life periods. The polymerization can be controlled especially well and yields polymerizate plates with thicknesses of up to 80 mm which can be easily foamed. The invention makes it possible to produce filling materials, especially plates and blocks containing electrically conductive particles.

Method for producing block-shaped polymethacrylimide foamed materials

Polymethacrylimide polymers poor in amide or N-alkylamide groups and in carboxyl and carbonic acid anhydride groups are obtained by heating a copolymer consisting of 1 to 60 mol percent of methacrylamide or/and an N-alkyl-methacrylamide and 40-99 mol percent of an alkyl methacrylate or/and phenyl methacrylate in an aliphatic monoalcohol.

Method for making polymethacrylimide polymers

A process for producing thin, anisotropic layers composed of liquid crystalline substances, the liquid crystalline substances being applied in a thin layer to one side of a support having a surface prestructured in such a way that the structure is given a preferred direction which determines orientation of the liquid crystalline substance and data storage devices produced.

Process for producing anisotropic liquid crystal layers on a substrate

A device for reversible optical data storage, comprising polymer film, the film comprising an amorphous polymer capable of photochromic isomerization, whereby data is reversibly stored in said polymer film and may be read by illuminating the isomerized polymer film with a light source.

Optical data storage apparatus and method utilizing an amorphous polymer

Rigid foamed polymethacrylimide synthetic resin containing from 0.1 to 10 percent by weight of electrically conductive particles such as conductive carbon black exhibit improved properties when used in rapidly flowing streams of gases, are particularly suitable for use as a core material in laminates for aircraft construction, and are prepared by heating a copolymer of methacrylic acid and methyacrylonitrile containing a blowing agent and conductive particles.

Hard foam cores for laminates

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Sulzbach, Germany

Norbert Rau