Bayer Aktiengesellschaft

Christoph G&uuml;rtler

Manfred Jautelat

Michael Schelhaas

Jan Mazanek

Herbert Hugl

Michael Ludewig

Thorsten Rische

Thomas Feller

Detlef-Ingo Sch&uuml;tze

Karin Naujoks

Helmut Greiving

Gerhard Arnold Braun

The present invention relates to new blocked polyisocyanates with which high-grade, emission-free coatings and lacquer coatings with reduced yellowing values can be obtained, to a method of producing them, and to the use thereof in one-component polyurethane systems, particularly as crosslinking agents in automobile primer surfacers.

Cyclic ketones as blocking agents

The invention relates to polyurethane-polyurea dispersions, also called PU dispersion, which contain aralkylamine-blocked isocyanate groups, and to their preparation and use. This blocking agent ahs a significantly lower deblocking temperature as compared with the prior art. Coatings produced from this dispersion have high hydrolysis resistances. The arylamine-blocked isocyanate groups are composed of polyisocyanates, polymeric polyols having average molar weights of 400 to 6000, at least one blocking agent, and either or both of nonionically hydrophilicizing compounds or compounds having at least one ionic or potentially ionic group.

Polyurethane-polyurea dispersions

&agr;,&ohgr;-Diene metathesis in the presence of ionic liquids

Thermosetting two-component coating compositions

The present invention relates to additives for preparing straight-chain or acrylonitrile dimer from acrylonitrile and to a process for preparing straight-chain acrylonitrile dimer from acrylonitrile in the presence of the additives according to the invention.

Preparation of a straight-chain acrylonitrile dimer

The present invention relates to a process for preparing a dinitronaphthalene isomer mixture having an increased proportion of 1,5-dinitronaphthalene by nitrating naphthalene in the presence of at least one ionic liquid.

Process for preparing a dinitronaphthalene isomer mixture having an increased proportion of 1,5- dinitronaphthalene

Using the process according to the invention, it is possible to provide, with few reaction steps, a novel route to &agr;-substituted ring systems, which optionally have further substituents.

Process for synthesizing &agr;-substituted ring systems

Using the process according to the invention, it is possible to provide, with few reaction steps, a novel route to &agr;-substituted ring systems which optionally have further substituents.

Growing community of inventors

Kö'ln, Germany

Christoph Gürtler

Growing community of inventors

Kö'ln, Germany

Christoph G&uuml;rtler

Christoph Gürtler