Bayer Aktiengesellschaft

Manfred Schonfelder

Josef Pedain

Klaus Konig

Helmut Steinberger

Wolfgang Reichmann

Hans Rudolph

Manfred Bock

Peter Hohlein

Lothar Kahl

Eckhard De Cleur

Hans-Joachim Hofer

Manfred Schmidt

Christian Wamprecht

Hans-Josef Laas

Peter Haas

Lutz Schmalstieg

Hans-Heinrich Moretto

Jan Mazanek

Klaus Nachtkamp

Walter Uerdingen

Jurgen Meixner

Martin Brahm

Dieter Mager

Eberhard Konig

Klaus Noll

Christian Wegner

Peter Heitkamper

Geza Avar

Wolfram Mayer

Helmut Schmid

Hermann Kober

Dietbert Knofel

Tilo Burkhardt

Walter Krauss

Anke Reinschmidt

Karl-Georg Bottger

Wofram Mayer

The present invention relates to aqueous compositions containing

Aqueous coating adhesive and sealant compositions containing

The present invention relates to a process for preparing mortar/concrete compositions by incorporating into the mortar/concrete compositions either before or during the mixing operation a water-dispersible polyisocyanate which

Use of nonionic, water-dispersible polyisocyanates as concrete additives

The present invention relates to a heat-crosslinkable water-based coating composition containing as binder

Water-based coating compositions and their use for the production of

The present invention relates to polyisocyanates which contain ester groups and have

Polyisocyanates containing ester groups, a process for the production of

The present invention is directed to a process for the production of isocyanurate polyisocyanates by the partial trimerization of the isocyanate groups of aliphatic diisocyanates in the presence of catalysts which accelerate the trimerization of isocyanate groups, termination of the trimerization reaction at the particular degree of trimerization required and removal of unreacted starting diisocyanate and, optionally, other volatile constituents, characterized in that at least one diol containing ester groups and having an average molecular weight of 350 to 950 is added to the reaction mixture at any time before removal of the excess starting diisocyanate in a quantity of 1 to 50% by weight, based on the weight of the diisocyanate used as starting material, the type of reactants and the quantitative ratios between them being selected so that, on completion of the reaction, at least 10% by weight free starting diisocyanate is still present in the reaction mixture, not including any inert solvent used, and the molar ratio of isocyanurate groups to urethane groups in the end products is about 20:1 to 0.2:1. The present invention is also directed to the isocyanurate polyisocyanates obtained by this process and the use of these isocyanurate polyisocyanates, optionally blocked by blocking agents for isocyanate groups, for the production of polyurethane plastics, particularly two-component polyurethane lacquers.

Process for the production of isocyanurate polyisocyanates, the

The present invention is directed to a process for the preparation of urethane-modified biuret polyisocyanates by the reaction of

Process for the preparation of biuret polyisocyanates, the compounds

The present invention is directed to polyester polyols in the hydroxyl number range of about 80 to 250 which are based on reaction products of

New polyester polyols and their use as polyol component in two-component

Binders which are hardenable by radiation or peroxides and are useful in coating compositions are compounds containing isocyanurate groups and olefinic double bonds produced by the reaction of components (a), (b) and (c) wherein

Process for the production of compounds containing isocyanurate groups

The present invention relates to new binder combinations comprising

Lacquer binder containing graft copolymer and polyisocyanates

The present invention is directed to substantially linear polyurethanes obtained from 1 mol of relatively high molecular weight macrodiols such as polyesters, polyethers and polycarbonates having a molecular weight of 400 to 5000, preferably about 500 to 3000, about 1.5 to 16.5 mols of aromatic diisocyanates, optionally about 0.01 to 1 mol of chain breaking agents in the form of compounds which are monofunctional in their reaction with isocyanates, and about 0.5 to 15 mols of low molecular weight, difunctional chain lengthening agents, characterized in that at least 10 mol-% of the chain lengthening agents is 2,2,4-trimethylpentanediol-(1,3) and the remaining chain lengthening agents, having molecular weights of 62 to 399 (preferably 62 to 250), are preferably diols. The present invention also relates to a process for the preparation of these polyurethanes and to their use for the production of coatings on flexible or non-flexible substrates, wherein the coatings are optionally filled, preferably with magnetizable pigments, and are optionally cross-linked.

Polyurethanes soluble or dissolved in aromatic hydrocarbons, a process

The present invention relates to polyester polyols having a hydroxyl number of about 80 to 250, containing reaction products of

Polyester polyols and their use as polyol component in two component

Polyester polyols and their use as polyol component in two-component

Polyisocyanate addition products are made by reacting a polysiloxane having isocyanate reactive end groups, excess polyisocyanate and a compound selected from the group consisting of aliphatic alcohols, primary aliphatic amines, secondary aliphatic amines and mixtures thereof having a molecular weight of from 75 to 5000 and at least one tertiary amino group and/or oxyalkylene unit. In a preferred embodiment, the polysiloxane is reacted with excess polyisocyanate and the reaction product is subsequently reacted with the alcohol and/or amine. The addition products of this invention are particularly useful as mold release agents in the production of molded lacquer coated plastics by the 'in-mold coating process.'

Polyisocyanate addition products useful as mold release agents and a

The invention relates to plastics mouldings, more particularly transparent plastics mouldings, which are finished with a coating of three successively stoved, chemically different layers, and to a process for producing the finish. The special finish considerably improves the scratch resistance, abrasion resistance, weathering resistance and yellowing resistance of the plastics surfaces without affecting the transparency of the plastics moulding. The first layer (primer layer) is produced from a hardenable acrylic resin and an aminoplast resin, the second layer from a thermoplastic acrylic resin, a plasticizer and a masked polyisocyanate and the third layer (cover layer) from at least one partially hydrolyzed organosilane, an .alpha.,.omega.-dihydroxy polydimethyl siloxane, a silica sol and at least one masked polyisocyanate as binder in the presence of a water-soluble organic or inorganic acid. The three-layer coating contains UV-absorbers, light stabilizers and, optionally, standard auxiliaries.

Plastics mouldings finished with a three-layer coating and a process for

The present invention relates to protective coating formulations, in particular to transparent abrasion-resistant and scratch-resistant coatings on transparent thermoplastic polymers, which coatings essentially consist of a hydrolyzed siloxane compound, a dispersion of colloidal silicon dioxide, etherified methylolmelamine, a blocked polyisocyanate, acetic acid and a polysiloxane terminated by hydroxyl groups.

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Leverkusen, Germany

Manfred Schonfelder