Bayer Aktiengesellschaft

Christian Zwiener

Josef Pedain

Wolfgang Fischer

Jan Weikard

Klaus Nachtkamp

Lothar Kahl

Peter Thometzek

Dieter Arlt

Reinhard Halpaap

Harald Blum

Lutz Schmalstieg

Dieter Margotte

Frank Richter

Jurgen Meixner

Michael Sonntag

Wolfgang Kiel

Volker Schneider

Rainer Rettig

Pedain

The present invention relates to a process for preparing urethanes containing (meth)acryloyl groups that are suitable as binders for powder coatings by reacting a polyisocyanate component with a hydroxyl group-containing component that contains at least one compound additionally containing (meth)acryloyl groups in a melt of compounds containing (meth)acryloyl groups, which are crystalline in the solid state and have a melting point of 30 to 100&deg; C. and a dynamic viscosity at 111&deg; C. of less than 10 Pa&middot;s, at elevated temperature until the NCO content has dropped below 0.5 wt. %. The present invention also relates to the use of these urethanes as binders for powder coating compositions for coating substrates made of wood, metal, plastics or mineral substances, which may have been primed.

Process for preparing urethanes containing (meth)-acryloyl groups as binders for powder coatings

The present invention relates to pulverent binders for powder coating compositions which contain oligo- and polyurethanes having (meth)acryloyl groups, are curable by means of high energy radiation and have an organic solvent content of less than 1 wt. %. The present invention also relates to a process for preparing these binders in the absence of an organic solvent and to their use in powder coating compositions for coating wood, metal, plastic, mineral and/or preprimed substrates.

Pulverent binders for powder coating compositions containing oligo-  and polyurethanes having (meth)acryloyl groups

Urethane acrylates and their use in coating compositions

A process for the preparation of coatings using a coating composition having a binder containing a two-component system of a) a polyisocyanate component and b) an isocyanate-reactive component b) which is essentially free from hydroxyl groups and contains b1) 5 to 95 parts by weight of a polyamine containing ester groups and secondary amino groups and b2) 5 to 95 parts by weight of polyketimines.

Process for the preparation of coatings

The present invention relates to aminoacrylates which have a viscosity of 200 to 3000 mPa.s at 23.degree. C. and 100% solids, a content of olefinic double bonds (calculated as C=C, molecular weight=24) of 8 to 20% by weight and a nitrogen content of 0.4 to 2.0% by weight, and which are prepared by an addition reaction by reacting at a molar ratio of primary amino groups from component a) to olefinic double bonds from component b) of 0.05:1 to 0.25:1 a) mono- or diamines having a molecular weight of 31 to 300 and having aliphatically bound amino groups with b) acrylic esters of polyhydric alcohols which have been prepared at a COOH/OH equivalent ratio of 0.8:1 to 1:1 from b1) acrylic acid and b2) ether-alcohols which have 3 or 4 hydroxyl groups and a molecular weight of 136 to 1000, possess at least one ethylene oxide unit --CH.sub.2 --CH.sub.2 --O-- as part of the ether structure and do not contain propylene oxide units --CH.sub.2 --CH(CH.sub.3)--O--. The present invention also relates to a process for the preparation these aminoacrylates.

Aminoacrylates and a process for their preparation

A coating composition in which the binding agent is a two-component system containing a) a polyisocyanate component and b) an isocyanate-reactive component and contains b1) specific ester group-containing secondary polyamines, b2) specific moisture-activatable blocked polyamines and b3) optionally other known compounds containing isocyanate-reactive groups, and a process for preparing coated substrates from this coating composition.

Surface coatings and a process for their production

N-alkoxysilylalkyl-aspartic acid esters are prepared by the reaction of equimolar quantities of amino-alkyl alkoxysilanes with maleic or fumaric acid esters. These N-alkoxysilylalkyl-aspartic acid esters are particularly useful as reactants in the preparation of prepolymers containing alkoxysilane and urea groups.

Compounds containing alkoxysilane and amino groups

The present invention relates to isocyanatocarboxylic acids containing

Isocyanatocarboxylic acids, a process for their preparation and their

The present invention relates to a process for the preparation of a polyurethane coating by coating a substrate with a coating composition containing

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Cologne, Germany

Christian Zwiener