Roehm Gmbh

Roehm Gmbh & Co Kg

Roehm Gmbh Chemische Fabrik

Evonik Rohm Gmbh

Senoplast Klepsch & Co., Gmbh

Evonik Degussa Gmbh

Evonik Roehm Gmbh

Michael Wicker

Klaus Albrecht

Klaus Schultes

Werner Siol

Werner Hoess

Uwe Numrich

Mona Rueppel

Klaus Koralewski

Eric Reinheimer

Hans-Juergen Kress

Heinz Vetter

Thomas Rhein

Christoph Krohmer

Guenther Dickhaut-Bayer

Achim Neuhaeuser

Johann Kappacher

Martina Pfirmann

Michael May

Gabriele Dassinger

Franz-Erich Baumann

Wolfgang Lortz

Ulrich Terbrack

Thomas Suefke

Ursula Golchert

Thorsten Goldacker

Ernst Mohr

Hermann Jaksch

Harald Häger

Rudolf Blass

Rüdiger Carloff

Michael Zietek

Wolfgang Fuchs

Uwe Schneider

Peter Kempf

Gerald Dietrich

Andreas Hoellebauer

Harry Schwarz

Tony Halblaender

Andreas Hollebauer

Werner Höss

Martin Mohrmann

Chih-Lung Chen

Mona RÜPPEL

Günther Dickhaut-Bayer

Tony Halbländer

Achim Neuhäuser

Andreas Höllebauer

A molding compound comprises a copolymer (I)a), produced by polymerization of 90-100% by weight methylmethacrylate, styrene and malic acid anhydride, and optionally 0-10% by weight additional monomers which can be copolymerized with methylmethacrylate, a (co)polymer (II)b), produced by polymerization of 80-100% by weight methylmethacrylate and optionally 0-20% by weight additional monomers which can be copolymerized with methylmethacrylate, and has a solution viscosity in chloroform at 25&#xb0; C. (ISO 1628 Part 6) of 50 to 55 ml/g, as well as c) optional conventional additives, auxiliary agents and/or fillers. The molding compound is characterized in that the copolymer (I) has a solution viscosity in chloroform at 25&#xb0; C. (ISO 1628 Part) of 55 ml/g or less. Also disclosed are moldings produced by thermoplastic processing of the molding compound and their uses.

Moulding compound for mouldings with high weather resistance

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

Compositions comprising an organic polymer as the matrix and inorganic particles as the filler and exhibiting in mixture The compositions can be prepared in a number of way, for example, by reprecipitation from the dissolved state or by mixing in an extruder and are used for preparing fibers, films and shaped articles with improved mechanical properties.

Compositions comprising an organic polymer as the matrix and inorganic particles as the filler, process for the preparation thereof and applications of the same

The invention relates to a multilayer film encompassing at least one upper layer a) and one middle layer b) composed of (meth)acrylate copolymers, and also a backing layer c) composed of polycarbonate, where the upper layer a) comprises a light stabilizer and is composed of a (meth)acrylate copolymer which can form semicompatible mixtures with the polycarbonate of the backing layer c), where a test specimen produced from a mixture composed of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate has a tensile strain at break of at least 75% (ISO 527-2) at 23&#xb0; C., the middle layer b) comprises a dye and, where appropriate, a light stabilizer, and is composed of an identical or different (meth)acrylate copolymer which can form semicompatible mixtures with the polycarbonate of the backing layer c), where a test specimen produced from a mixture composed of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate has a tensile strain at break of at least 75% (ISO 527-2) at 23&#xb0; C., and the backing layer c) is composed of polycarbonate which can, where appropriate, comprise up to 30% by weight of the material of the layers a) and b). The invention also relates to the production and uses of the multilayer film, and also to semicompatible polymer mixtures composed of (meth)acrylate copolymers and polycarbonate.

Multilayered film made of (meth)acrylate copolymer and polycarbonate

The invention relates to a multilayered film comprising at least one upper layer a), a middle layer b) made of (meth)acrylate copolymer, and a supporting layer c) made of polycarbonate. Upper layer a) contains a light-stability agent and is made of a (meth)acrylate copolymer that, together with the polycarbonate of supporting layer c), can form partially compatible mixtures. A test piece, which is made from a mixture consisting of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate, has a breaking elongation (ISO 527-2) of at least 75% at 23&#xb0; C. The middle layer b) contains a colorant and, optionally, a light-stability agent and is made from an identical or different (meth)acrylate copolymer that, together with the polycarbonate of supporting layer c), can form partially compatible mixtures. A test piece, which is made from a mixture consisting of 20% by weight of (meth)acrylate copolymer and 80% by weight of polycarbonate, has a breaking elongation (ISO 527-2) of at least 75% at 23&#xb0; C., and the supporting layer c) is made of polycarbonate that, optionally up to 30% by weight of the material of the layers, can contain a) and b). The invention also relates to the production and uses of the multilayered film and to partially compatible polymer mixtures consisting of (meth)acrylate copolymer and polycarbonate.

The invention relates to a polymer mixture based on the (meth)acrylate (co)polymer components a), b), c), and/or d) according to claim 1, where a test specimen produced from the polymer mixture simultaneously has the following properties:

Polymer mixture and the utilization thereof for injection molded parts

The invention relates to an impact-modified moulding composition which has particularly high impact resistance at low temperatures (&#x2212;20&#xb0; C., &#x2212;40&#xb0; C.). This low-temperature impact resistance is achieved by using a silicone elastomer.

Molding materials exhibiting an improved low-temperature impact resistance

The invention relates to an impact-modified molding composition which has particularly high impact resistance at low temperatures (&#x2212;20&#xb0; C., &#x2212;40&#xb0; C.). This low-temperature impact resistance is achieved by using a silicone elastomer.

PMMA molding materials exhibiting an improved low-temperature impact resistance

Products based on polymethylmethacrylate (PMMA) so resistant to yellowing and so highly transparent that even the edges of plates produced from this material have a neutral colour, i.e. do not display any yellow tone. This effect is obtained by the admixture of 5 to 50 ppm inorganic, reducing phosphorus compounds after polymerisation. This enables the brightener content to be reduced under 10 ppb, and so the end product may also be used in contact with foodstuffs.

Process for producing polymethylmethacrylate molding materials with a neutral color

The invention relates to a shaping tool for the injection molding or injection compression of information carrier disc blanks ( ) made of polymethacrylate plastic which is suited as a component of an injection molding or injection compression machine. The shaping tool is comprised of two mold parts ( ), whereby one mold part ( ) contains a bottom part ( ) of a mold with the information data and, together with the second mold part ( ), forms a cavity for the one information carrier blank and one sprue bush ( ) for a sprue piece ( ) in the tool having a concentrically positioned feed orifice ( ). In addition, the tool comprises a impact cylinder ( ) for shearing the sprue piece ( ) and has an ejector pin ( ). The invention is characterized in that the injection gap (SP) between the feed orifice ( ) of the sprue piece ( ) and the information carrier disc blank ( ) is less than 0.3 mm. In addition, the cutting gap (SN) between the edge of the impact cylinder ( ) and the information carrier disc blank ( ) is less than 0.2 mm.

Shaping tool for information carrier disc blanks

The invention concerns a mixture or polymer composite of a copolymer (CP) comprising between 70 and 99.9 wt % methylmethacrylate, between 0.1 and 5 wt % maleic acid anhydride and between 0 and 25 wt % further vinylically copolymerizable monomers which, apart from the vinyl function, have no further function groups, with a polymethacrylate-compatible plastics (VK) and a polymer (PN) which contains at least one terminal nucleophilic groups.

(Methyl) methacrylate maleic acid anhydride copolymers as polymer modifying agents for plastics and mixtures and polymer composites produced therewith

The invention concerns a process for producing polymethacrylate moulding compounds, which have high thermal dimensional stability and high stability with respect to thermal decomposition, by the radical polymerization of methylmethacrylate monomers and optionally comonomers in at least two reactors operated successively, ensuring a high degree of blending. The process is characterized in that: a) a first reactor is operated at a temperature of less than 120&deg; C.; and b) a second reactor or further successive reactors is/are operated in a temperature range of more than 130&deg; C. and at most 200&deg; C.

Multi-stage process for producing heat resistant dimensionally stable polymethacrylate moulding compounds

The invention concerns the use of a copolymer comprising (a) between 60 and 98 wt % methylmethacrylate, and (b) between 2 and 40 wt % styrene, and optionally (c) between 0 and 20 wt % maleic acid anhydride, as modifying agents for increasing the melt viscosity for partially crystalline, partially aromatic polyesters, with the exception of polybutylene terephthalate containing intensifier fillers.

Modified polyesters

Polymethacrylate molding compound with ethylene

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Seeheim-Jugenheim, Germany

Michael Wicker