Bayer Aktiengesellschaft

Ec Erdolchemie Gmbh

Werner Struver

Wolfgang Podszun

Holger Lutjens

Robert Horst Bloodworth

Olaf Halle

Peter M Lange

Alexander Klausener

Karl-Erwin Piejko

Winfried Joentgen

Reinhold M Klipper

Bernd Alig

Guido Steffan

Torsten Groth

Jurgen Kirsch

Gerhard Fennhoff

Heinz Landscheidt

Stefan Antons

Alfred Mitschker

Harold Heller

Josef Kasbauer

Ralf Pakull

Axel Ingendoh

Arnd Stuwe

Rudolf Wagner

Ingo Janisch

Hans-Jurgen Bister

Herbert Tschorn

A catalytic agent for etherifying, hydrogenating and isomerizing crude C.sub.4 -C.sub.8 -- hydrocarbon mixtures having a sulfur content, comprising a macroporous or gel cation exchanger having SO.sub.3 H groups and being charged with a mixture of a metal selected from the group consisting of Pd, Ru, Rh and Pt with a metal selected from the group consisting of Fe, Co, Ni, Cu, Ag and W.

Catalyst agent for etherifying, hydrogenating and isomerizing crude      .

Suspension polymers having high swellability have low contents of soluble fractions if aliphatic peroxy esters are used as polymerization initiators.

Crosslinked bead-form polymers

Polymers of improved surface quality are obtained by polymerization of microencapsulated monomer droplets suspended in an aqueous phase if the monomer and/or the aqueous phase contain a polymerization inhibitor.

Process for the preparation of microencapsulated polymers

Process for preparing crosslinked bead-form polymers

Monodisperse crosslinked polymers prepared by seed/feed polymerization have less tendency to tack when a microencapsulated monodisperse crosslinked polymer has been used as seed. Compared with the seed used, the seed/feed polymer obtained exhibits substantially less broadening of the particle size distribution when microencapsulated seed has been used.

Process for the preparation of crosslinked polymers

N-Substituted cyclic imides are obtained by reacting a cyclic acid anhydride with an amine in the presence of a solvent and an acid catalyst at 80.degree. to 200.degree. C. and with removal of the water formed, it being particularly advantageous to carry out this reaction in the presence of a stabilizer and an inert, dipolar aprotic cosolvent, optionally to add an inert organic solvent of low or zero polarity to the reaction mixture present after the reaction, to add a non-aqueous base in an amount of 0.5 to 50% by weight, based on the cyclic anhydride of the formula (II) used, and to separate off the precipitate formed to give a filtrate containing the N-substituted cyclic imide.

Process for the preparation of N-substituted cyclic imides

An improved aminomethylation process gives weakly-basic anion exchangers in an elegant way, with by-product obtained being able to be processed into a suitable starting material without problems.

Process for preparing weakly-basic anion exchangers and reagents

Methanol can be substantially removed from dimethyl carbonate (DMC)/methanol mixtures by absorption on ion exchange resins. The enriched DMC is obtained as filtrate. The absorption is carried out at from -50.degree. C. to +100.degree. C. and 0.1-10 bar.

Process for separating off methanol from a mixture of dimethyl carbonate

A catalytic method for preparing thermoplastic carbonate polymers is disclosed. In the method according to the interfacial polycondensation process or the homogeneous solution process, resins which containing catalytically active groups are used as catalysts. The resulting resins are characterized by their color stability and temperature stability.

Method of preparing polycarbonates and polyester carbonates

Process for the production of bead polymers of improved uniform particle size and uniform quality comprising (a) producing droplets which have a uniform particle size from the monomer or polymerization mixture to be polymerized by spraying the monomer or polymerization mixture into a liquid (continuous phase) which is essentially immiscible with the monomer or polymerization mixture, (b) encapsulating these droplets of uniform size are by shells which are stable under the polymerization conditions to be used and (c) then polymerizing the encapsulated droplets, and with the provision to maintain in the process steps of droplet production and encapsulation of the droplets certain special conditions.

Process for the preparation of bead polymers of uniform particle size by

New Synthetic resins useful as inert material for separating layers in ion exchanger mixed bed filters. The new synthetic resins are copolymers of

Synthetic resins based on crosslinked copolymers of monovinyl and

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Leverkusen, Germany

Werner Struver