Bayer Aktiengesellschaft

Frank Wingler

Lothar Liebig

Alfred Pischtschan

Otto-Christian Geyer

Karl-Heinz Ott

Otto Koch

Gert Humme

Gerd Wassmuth

Josef Pedain

Christian Lindner

Klaus Reinking

Martin Ullrich

Clemens Casper

Joachim Doring

Richard Prinz

Richard Muller

Klaus Summermann

Manfred Hederich

Rolf Dhein

Herbert Eichenauer

Karl-Erwin Piejko

Rudolf Binsack

Dieter Margotte

Werner Nouvertne

Claus H Wulff

Artur Reischl

Walter Uerdingen

Adolf Schmidt

Friedemann Muller

Gisbert Michels

Richard Weider

Ulrich Jansen

Peter Schwabe

Helmut Waniczek

Winfried Fischer

Eckhard De Cleur

Ralph Ostarek

Johannes O Sajben

Gunter Lehr

Bernd W Leusner

Henning Klussmann

Theobald Eicher

Joachim Doering

Dieter Pollheide

Process for producing ABS moulding compositions having a high rubber content

A method of producing ABS moulding compositions wherein a solution of polymers in group (A) solvents is gradually supplied to a polymerizing mixture of previously-formed soluble rubber, aromatic mono-alkenyl compounds, ethylenically unsaturated nitrites, optional other copolymerizable compounds and optionally a group (B) solvent or a mixture of group (A) and group (B) solvents, the gradual addition of the polymer solution to the polymerizing mixture being started before the beginning of phase inversion and at a monomer conversion rate of 5 to 15% and a viscosity of the polymerizing mixture of less than 20 Pa.sec with simultaneous continuation of polymerization, the group (A) solvent is an aliphatic (C.sub.1 -C.sub.8) or cycloaliphatic alcohol, ketone, ether, ester and/or nitrile, and the group (B) solvent is an aliphatic (C.sub.4 -C.sub.10), cycloaliphatic and/or aromatic hydrocarbon.

Method of producing ABS moulding compositions

Thermoplastic moulding compositions

The invention relates to new cross-linked copolymers of N-vinyl pyrrolidone, N-alkyl-N-vinyl carboxylic acid amides, methacrylates and optionally further copolymerizing monomers of a specific composition. the copolymers have a water absorption capacity of up to about 80% by weight, based on the hydrated state, and are suitable for the production of shaped articles which are in contact with living tissue in use. Examples include soft contact lenses and scleral lenses of high mechanical strength, in particular thin to very thin lenses for prolonged wear.

Hydrophilic copolymers, the use thereof as biomedical materials and

Process for the preparation of thermoplastic copolymers of .alpha.-methylstyrene and acrylonitrile by continuous bulk copolymerization of

Process for the preparation of binary

The optical contact objects contain a wettable, optionally crosslinked copolymer comprising the components N-vinylcarboxamide, (meth)acrylates of a polysiloxane and, optionally, vinyl monomers.

Optical contact objects

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.

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.

Acrylonitrile-free polycarbonate blends

The discharge apparatus comprises an at least four-shaft screw pump having engaging shafts (1,2,3,4) which rotate in opposite directions in pairs. The viscous product to be processed is caught up over a large area and removed by the screws. A double shaft screw pump is connected downstream of the actual collection zone as a pressure build-up zone. The two center screws (2, 3) of the collection zone merge equiaxially into the screw shafts (2a, 3a) of the pressure build-up zone. The collection zone and the pressure build-up zone are combined into one constructional unit. At least one screw shaft is driven. The resulting high viscosity product strands (7) are caught up by the screws in the collection zone and are moved on into the pressure build-up zone. The double shaft screw pump is used for the build up of a high operational pressure and thus provides the prerequisite for the subsequent connection of further procedural stages. The universal possibilities of use of this discharge apparatus are to be stressed in particular.

Apparatus for discharging high viscosity media in chemical engineering

Contact lenses prepared from a polymer alloy essentially free from low molecular weight plasticizers and which comprises

Use of polymer alloys based on cellulose esters in contact ophthalmics,

Contact lenses and implants for human medicine can be fabricated from a polymer blend comprising 98-80% by weight of component A and 2-20% by weight of component B wherein: component A is a cellulose ester of an aliphatic carboxylic acid with up to 40% by weight of total component A of an ethylene/vinyl acetate copolymer having 30-98% by weight, relative to ethylene/vinyl acetate, of incorporated vinyl acetate and component B is a homopolymer or copolymer of water-soluble vinyl monomers and up to 10% by weight relative to the total polymer B of multifunctional crosslinker vinyl compounds.

Hydrophilized cellulose esters, process for their preparation, their use

This invention relates to a process for carrying out reactions which primarily occur during the transport of compounds in the liquid phase or at the liquid-gas interface. Starting components are reacted with one another and/or with gases of the inner space in a multi-phase flow tube having a liquid ring flow which may contain dissolved and/or dispersed constituents. Any necessary heat exchange takes place between the liquid and the wall of the tube or the gases.

Process for carrying out reactions caused by the transport of substances

Contact lenses and contact shells of light-refracting material consisting essentially of a copolymer of

Contact lenses of methyl methacrylate copolymers

A thermoplastic moulding composition comprising:

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Leverkusen, Germany

Frank Wingler