Bayer Aktiengesellschaft

Other

Teijin Limited

Bayeraktiengesellschaft

Volker Wege

Johann Rechner

Friedrich-Karl Bruder

Konstadinos Douzinas

Yun Chen

Ralf Dujardin

Eberhard Zirngiebl

Thiemo Marx

Michael Mager

Steffen Hofacker

Rüdiger Musch

Knut Panskus

Stefan Grabowski

Water-containing compositions containing polychloroprene particles, zinc oxide particles having an average particle size of less than 150 nm and water. The compositions can be used as adhesives and/or sealants.

Aqueous compositions based on polychloroprene

A process for hydrogenating aromatic polymers is disclosed. The process entails using a supported catalyst wherein support contains alumina and where the catalyst comprise at least one metal of subgroup VIII of the Periodic Table. The catalyst is characterized in that the pore volume of the pores having diameters of 1000 to 10,000 Angstrom is 15 to 100% relative to the total pore volume, as determined by mercury porosimetry.

Method for hydrogenating aromatic polymers in the presence of special catalysts

A thermoplastic molding composition containing a (co)polymer of vinylcyclohexane and a stabilizer system is disclosed. The stabilizer system contains lactone, sterically hindered phenol and a phosphite compound. The composition that is characterized by its improved thermal stability is suitable for the preparation of molded articles, including optical data carriers.

Vinylcyclohexane&mdash;based polymer/copolymer mixture and stabilizer system

The invention relates to a process for the preparation of nano-zinc oxide dispersions stabilized by hydroxyl group-containing inorganic polymers.

Process for the preparation of nano-zinc oxide dispersions stabilized by hydroxyl group-containing inorganic polymers

A molding composition comprising a (co)polymer of vinylcyclohexane is disclosed. The copolymer is characterized in having an absolute molecular weight M of 100,000 to 450,000 g/mol, polydispersity index of 1 to 3 and maximum melt viscosity of 1000 Pa&middot;s, as measured at 300&deg; C. and at a shear rate of 1000 sec . The composition is suitable for producing a variety of molded article most notably optical data storage media.

Vinylcyclohexane-based polymers

Process for hydrogenating aromatic polymers in the presence of catalysts, wherein a metal or mixture of metals from group VIII of the Periodic Table together with a support of silicon dioxide, aluminium dioxide or a mixture thereof is used as the catalyst, and the catalyst pore volume defined by pores of diameters between 100 and 1000 &angst;, measured by mercury porosimetry, is generally from 100 to 15%, in relation to the total pore volume, measured by mercury porosimetry.

The present invention relates to block copolymers which are predominantly based on vinylcyclohexane and to a process for producing them. The block copolymers can be processed to form mouldings by extrusion or injection moulding. The mouldings which result therefrom are distinguished by their high resistance to thermal deformation, good mechanical properties, high transparency in the visible and near UV range, and by their particularly low birefringence and water absorption.

Vinylcyclohexane-based block copolymers

A catayltic process for the hydrogenation of aromatic polymers is disclosed. The catalyst used in the process is a metal or mixture of metals of sub-group VIII of the periodic table together with a support of silicon dioxide, aluminum oxide or a mixture thereof. The catalyst, having pores is characaterized in that the pores having diameters of 100 to 1,000 &angst; constitute less than 15 percent of the total volume of pores. The hydrogenation, that is carried out in the presence of at least one oxygen-containing hydrocarbon is characterized in that it is essentially complete and without significant degradation of molecular weights.

Method for hydrogenating aromatic polymers in the presence of hydrocarbons which contain oxygen

A process for the hydrogenation of aromatic polymers is disclosed. Accordingly, the solvent used comprise an ether that contains no -hydrogen atom on a carbon atom adjacent to the ether function. The process results in virtually complete hydrogenation of the aromatic units.

Method for hydrogenating aromatic polymers

Amorphous polymers, including homopolymers and co-polymers, containing residues of vinyl cyclohexane and/or substituted vinyl cyclohexane are described. The polymers of the present invention have a syndiotactic configuration in which the quantity of diads is greater than 50.1% and less than 74%. The polymers of the invention have high transparency, low birefringence and high heat defection temperature, and can be used to prepare molded articles (e.g., optical data storage media and lenses) and films.

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Krefeld, Germany

Volker Wege