Bayer Aktiengesellschaft

Bayer Akteingesellschaft

Otto Koch

Christian Lindner

Klaus Reinking

Karl-Heinz Ott

Horst Peters

Frank Wingler

Dieter Wittmann

Hans-Jurgen Kress

Hans-Eberhard Braese

Ulrich Jansen

Gert Todtemann

Pol Bamelis

Herbert Eichenauer

Karl-Erwin Piejko

Alfred Pischtschan

Friedemann Muller

Josef Buekers

Karl Zabrocki

Jurgen Hinz

Lothar Liebig

Ralph Ostarek

Wolfgang Herrig

Burkhard Braun

Joachim Doering

Edwin Roth

Kress Hans-Jurgen

Lindner Christian

A process for the continuous processing of vinyl polymer latices to produce thermoplastically processible vinyl polymer powder by coagulating a stream of a vinyl polymer latex by the addition of a stream of a coagulant with intensive mixing and shearing in a cascade of vessels at an average residence time per vessel of 10 to 60 minutes and at temperatures from 50 to 120.degree. C., volatile auxiliary substances and residual monomers in the polymer being optionally removed by steam distillation and part of the serum separated from the vinyl polymer being added to the stream of coagulant.

Process for the continuous coagulation of vinyl polymer latices

A process for processing polymers of the ABS type present in emulsion form and effectively stabilized against oxidative attack with optionally continuous recovery and direct reuse of untreated monomers, wherein a combination of at least one phenolic antioxidant having a molecular weight above 300 without ester groups in the molecule and at least one sulfur-containing co-stabilizer having a molecular weight above 500 without ester groups in the molecule is added to the ABS polymer emulsion for stabilization against oxidative degradation.

Process for working up stabilized ABS polymers with recovery of

A process for the production of mixtures of thermoplastic polymers in powder form from aqueous emulsions of

Mixtures of thermoplastic polymers in powder form

An .alpha.-methylstyrene/acrylonitrile copolymer obtainable by emulsion polymerization which, in combination with other polymers, particularly PVC, enables alloys of outstanding thermal stability and color stability to be produced and, in addition, has a high heat distortion temperature and shows good fogging behavior and which is obtained by radically initiated inflow copolymerization of a mixture of 30 to 32 parts by weight acrylonitrile and 68 to 70 parts by weight .alpha.-methylstyrene in the presence of an emulsifier containing carboxyl groups. The polymerization is conducted in such a way that a seed latex of the same copolymer or of an analogous copolymer is introduced before addition of the monomers is commenced, the reaction temperature is kept between 75.degree. and 82.degree. C. and the molar ratio of emulsifier to initiator is between 4 and 6.

Seeded emulsion polymerization of .alpha.-methylstyrene and acrylonitrile

A process for the preparation of polymer powders from polymer dispersions by feeding a polymer dispersion continuously into an atomization apparatus and separately therefrom but at the same time also introducing a liquid agent, the dispersion and the liquid agent being completely mixed within at the most one second and the mixture being immediately thereafter dried with evaporation of the volatile constituents to form a powder composed of particles having an average diameter of from 0.05 to 1 mm, and the polymer powders prepared by this process.

Process for the preparation of polymer powders by spray drying

The present invention provides thermoplastic flame-retardant moulding compositions containing halogen-containing copolycarbonates, styrene/maleic anhydride copolymers, phosphorus compounds of the formula (I) ##STR1## and tetrafluoroethylene polymers and, if desired, further known additives.

Thermoplastic moulding compositions having flame-retardant properties

The invention relates to a process for the recovery of thermoplastic polymers from aqueous dispersions by spray-drying after treatment with carboxylic acid of formula I ##STR1## wherein X is a single bond, --CH.sub.2 -- or --C.sub.2 H.sub.4 --, and

Processing of polymer dispersions by spray drying

The present invention relates to thermoplastic moulding compositions containing thermoplastic polycarbonates, graft polymers, rubber-free copolymers and, if appropriate, copolymeric rubbers, and also, if appropriate, conventional additives, which are characterized in that the rubber-free copolymers contain internal epoxide compounds.

Thermoplastic moulding compositions based on polycarbonate/graft polymer

The present invention relates to thermoplastic moulding compositions consisting of halogen-free polycarbonates, styrene/maleic anhydride copolymers, phosphorus compounds of the formula (I) ##STR1## and tetrafluoroethylene polymers and, where appropriate, other known additives.

Thermoplastic moulding compositions with flame-resistant properties

Thermoplastic, high-impact moulding compositions of (A) 5 to 80 parts by weight of a graft product of 70 to 30% by weight of a mixture of an aromatic vinyl compound and acrylonitrile and/or methacrylonitrile on 30 to 70% by weight of a rubber having a glass transition temperature of below -10.degree. as the graft base and (B) 20 to 95 parts by weight of a terpolymer of styrene and/or .alpha.-methylstyrene, p-methylstyrene and acrylonitrile and/or methacrylonitrile, the terpolymer having been produced by mass polymerization.

Thermoplastic moulding compositions

This invention relates to thermoplastic moulding compounds free from nitrile groups, containing a mixture of randomly structured copolymers containing methyl methacrylate, maleic acid anhydride and aromatic vinyl compounds, aromatic polycarbonate resins and an elastomer grafted with methyl methacrylate.

Acrylonitrile free blends of a polycarbonate, a graft rubber and a

This invention relates to thermoplastic moulding compounds which are free from nitrile groups, obtained from randomly structured aromatic vinyl copolymers containing N-phenyl- or methyl-maleimide, aromatic polycarbonate resins and an elastomer grafted with methyl methacrylate.

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Cologne, Germany

Otto Koch