Bayer Aktiengesellschaft

J&uuml;rgen Meixner

Wolfgang Fischer

Josef Pedain

Joachim Petzoldt

Wolfgang Kremer

Heino M&uuml;ller

Erhard L&uuml;hmann

Hans-Josef Laas

Harald Blum

Jan Weikard

Joachim Probst

Hanns-Peter M&uuml;ller

Gerald Kurek

Horst Gruttmann

Horst Clemens

Manfred M&uuml;ller

Claudio Rebuscini

Aqueous barrier layer based on polyurethane dispersions

The invention relates to an aqueous 2-component polyurethane (PU) coating composition comprising a vinyl polymer polyol dispersion, having a hydroxyl number between 10 and 264 mg KOH/g solid resin, an acid value (calculated from the sum of neutralized and non-neutralized acid groups) between 0 and 55 mg KOH/g solid resin, a number-average molecular weight M of at least 5000 g/mol and a weight average molecular weight M of at least 30,000 g/mol, a glass transition temperature of at least 20&deg; C. and an average particle diameter of no greater than 300 nm, which is prepared in the presence of 0.1 to 10.0 wt. %, relative to the sum of the solids contents of polymer polyol and polyisocyanate, of a non-ionic polyether surfactant and a polyisocyanate having a viscosity at 23&deg; C. of no more than 12,000 mPa*s and either a non-hydrophilic or a non-ionically or anionically hydrophilic character, whereby the equivalent ratio of isocyanate groups of component b) to hydroxyl groups of component a) is 0.2:1 to 5:1; a process for the preparation of such aqueous 2-component coating compositions, and their use as 2-component PU paints for painting any type of substrate.

Aqueous 2-component PU systems

The present invention relates to radiation curable aqueous polyurethane dispersions containing 0.05 to 20 wt. %, based on the weight of the non-aqueous constituents of the aqueous polyurethane dispersions, of 2,2-dimethyl-3-hydroxypropionic acid-(2,2-dimethyl-3-hydroxypropyl ester), (HPSNPG, calculated as MW 204.3). The invention also relates to substrates coated with these polyurethane dispersions, in particular to coated wood substrates with good grain enhancing properties.

Polyurethane dispersions

The present invention relates to coating compositions comprising a mixture of at least two aqueous, anionic polyurethane polyurea dispersions A and B, wherein dispersion A as a dry film has a TG in the range from &minus;30&deg; C., to &minus;45&deg; and dispersion B as a dry film has a first TG in the range from &minus;30&deg; C. to &minus;45&deg; C. and a second TG in the range from &plus;45&deg; C. to &plus;60&deg; C., and the mixture of A and B as a dry film has only one TG in the range from &minus;30&deg; C. to &minus;45&deg; C.

Coating composition comprising diverse anionic polyurethane-polyurea dispersions

Compositions containing unsaturated polyester resins and their use for the production of coatings

Process for the preparation of epoxy (meth) acrylates reacting epoxy compounds with anhydride and oh-functional (meth)acrylic-polyetherpolyol

UV-curable coating compositions containing urethane acrylates prepared from hydroxyalkyl acrylates and low-viscosity polyisocyanates having isocyanurate groups, low-viscosity acrylic ester components as reactive diluents, initiators, and optionally solvents and/or other known additives, and their use for coating molded articles of thermoplastic polycarbonates.

Polycarbonate molded articles coated with UV-curable compositions

UV-curable coating compositions and their use for coating polycarbonate molded articles

Growing community of inventors

Krefeld, Germany

Jürgen Meixner

Growing community of inventors

Krefeld, Germany

J&uuml;rgen Meixner

Jürgen Meixner