Bayer Materialscience Ag

Covestro Deutschland Ag

Bayer Materialscience, LLC

Bayer Intellectual Property Gmbh

Covestro LLC

Erhard Luehmann

Stefan Sommer

Harald Blum

Jan Weikard

Thorsten Rische

Richard Kopp

Klaus Meyer

Christoph Irle

Thomas Michaelis

Roland Künzel

Holger Casselmann

Serkan Unal

Diethelm Rappen

Michael J Dvorchak

Jürgen Lippemeier

Micheal J Dvorchak

Hans Braun

Julián Flores

Juergen Lippemeier

The present invention relates to radiation-curable, aqueous dispersions based on polyurethane acrylates (i), which are characterized in that the polyurethane acrylate (i) comprises as builder components A) one or more aromatic polyepoxy(meth)acrylates with an OH number of from 20 to 300 mg of KOH/g of substance, C) one or more oligo- or polyesters containing unsaturated fatty acids with an OH number of from 15 to 300 mg of KOH/g of substance and an iodine number of greater than 50 g of I/100 g of substance, E) one or more compounds with at least one group which is reactive towards isocyanate and additionally at least one group having a hydrophilizing action and F) one or more organic polyisocyanates, a process for the preparation thereof, the use of the coating compositions as lacquers and/or adhesives, and objects and substrates provided with these lacquers and/or adhesives.

Aqueous polyurethane dispersions

The present invention relates to a process for the preparation of low-viscosity, radiation-curable, aqueous dispersions based on polyurethane acrylates (UV-PUDs), wherein the UV-PUDs hydrophilized via hydroxy-functionalized carboxylic acids have a lower initial viscosity when a large part of the urethanization, that is to say the reaction of the NCO-functionalized compounds with the OH-functionalized compounds, initially takes place in the absence of the acid-carrying compounds and the incorporation of the acid-carrying compounds via their hydroxyl function takes place as late as possible.

Low-viscosity polyurethane acrylate dispersions

The present invention describes the preparation of an aqueous polyurethane dispersion which is cured by radiation, and its use as binder.

Process for producing hard coating systems based on aqueous polyurethane dispersions

The present invention relates to radiation-curable coating compositions based on tin-free aqueous polyurethane dispersions based on polyurethane acrylates (i), characterized in that the polyurethane acrylate (i) comprises as builder components A) one or more compounds with at least one group which is reactive towards isocyanate and at least one unsaturated group which can undergo free radical polymerization, B) one or more compounds which differ from A) and have at least one group which is reactive towards isocyanate, C) one or more compounds with at least one group which is reactive towards isocyanate and additionally at least one group having a hydrophilizing action, D) one or more organic polyisocyanates, which are reacted in the presence of F) bismuth(III) salt(s) and G) an acid having a pKa of &#x3c;2.5, and a process for the preparation thereof, the use of the coating compositions as lacquers and/or adhesives, and objects and substrates provided with these lacquers and/or adhesives.

Tin-free aqueous polyurethane dispersions

The present invention relates to a process for the production of sized and/or wet-strength papers, paperboards or cardboards, wherein an aqueous radiation-curable dispersion containing water and at least one polymer, characterized in that the polymer contains cationic groups, is mixed with suspended wood pulp and/or chemical pulp and this mixture is sieved, pressed, thermally dried and then radiation-cured, characterized in that the dispersion is employed in amounts, based on its non-aqueous content in relation to the solid content of the wood pulp and/or chemical pulp, of from 0.001 to 10 wt. %, the papers, paperboards and cardboards produced by this process, and compositions comprising suspended wood pulp and/or chemical pulp and an aqueous radiation-curable dispersion containing at least one polymer, characterized in that the polymer contains cationic groups.

Process for the production of sized and/or wet-strength papers, paperboards and cardboards

The present invention describes block-resistant, radiation-curable coating systems based on high molecular mass, aqueous polyurethane dispersions, a process for preparing them, the use of the coating systems as paints and/or adhesives, and also articles and substrates provided with these paints and/or adhesives.

Block-resistant, radiation-curable coating systems based on high molecular mass, aqueous polyurethane dispersions

Aqueous UV-hardenable dispersions are provided, as well as their use for the production of coating agents, in particular coatings for ligneous substrates. The dispersions comprise the reaction product of a) one or more polyisocyanates of which at least one polyisocyanate is an oligomeric polyisocyanate of hexamethylene diisocyanate with urethane, biuret, iminooxadiazindione and/or isocyanurate structural units, b) one or more monohydroxy-functional compounds containing (meth)acryloyl groups, c) at least one component c1), which has a hydrophilising effect on the basis of incorporated (potentially) ionic groups and comprises at least one further isocyanate-reactive group and/or at least one component c2) which contains non-ionically hydrophilically acting groups and comprises at least one further isocyanate-reactive group, d) one or more difunctional and/or polyfunctional amines or hydroxyamines as chain extender, and e) optionally other monomeric, oligomeric and/or polymeric substances, which may optionally also contain further unsaturated groups.

UV-hardenable dispersions based on polyisocyanates

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Bomlitz, Germany

Erhard Luehmann