Roehm Gmbh & Co Kg

Roehm Gmbh

Hermann Jaksch

Uwe Numrich

Michael Wicker

Heinz Vetter

Klaus Albrecht

Mona Rueppel

Michael May

Ernst Mohr

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 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

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Ober-Ramstadt, Germany

Hermann Jaksch