Bayer Aktiengesellschaft

Gerhard Mennicken

Werner Kubitza

Josef Pedain

Walter Uerdingen

Manfred Bock

Theodor Engbert

Peter Breidenbach

Kurt Findeisen

Kuno Wagner

Hanns P Muller

Klaus Nachtkamp

Hans-Joachim Scholl

Peter Hohlein

Michael Sonntag

Rudolf Fauss

Roland Richter

Bernd Riberi

Bernd Peltzer

Wolfhart Wieczorrek

Jurg Frohlich

Freidrich Blomeyer, Deceased

The invention is directed to a process for the production of uretdione group-containing compounds by dimerizing at least a part of the isocyanate groups of organic isocyanates in the presence of compounds containing phosphorus-nitrogen bonds as dimerization catalysts, characterized in that the reaction is carried out in the presence, as co-catalysts, of H-active organic compounds having a pKa-value of at least 6, which have at least one hydrogen atom bound to oxygen, sulphur or nitrogen. The invention also relates to the uretdione group-containing compounds obtained according to this process and to their use for the production of plastics materials according to the isocyanate-polyaddition process.

Process for the production of uretdione group-containing compounds, the

The present invention is directed to a process for improving the coatings properties of aqueous emulsion paints having a binder based on homo or copolymers of olefinically unsaturated monomers substantially free from urethane groups by adding at least one organic polyisocyanate having a viscosity at 23.degree. C. of about 50 to 4000 mPa.s, wherein the organic polyisocyanate has aliphatically and/or cycloaliphatically bound isocyanate groups and an isocyanate functionality of at least 3, optionally in combination with other organic polyisocyanates containing aliphatically and/or cycloaliphatically bound isocyanate groups and having an isocyanate functionality of 2, provided that the average functionality is at least 2.2. The present invention is also directed to the ready for use aqueous emulsion paints prepared by the above process.

Use of polyisocyanates or polyisocyanate mixtures as additives for

The present invention relates to a process for the production of oligomeric polyisocyanates by the dimerization or trimerization of a portion of the isocyanate groups in organic polyisocyanates in the presence of tertiary phosphines or in the presence of a peralkylated phosphorus acid triamides as catalyst, followed by termination of the dimerization and/or trimerization reaction at the required degree of oligomerization by the addition of a catalyst poison, characterized in that a sulfonyl isocyanate is used as the catalyst poison. The present invention also relates to the use of the oligomeric polyisocyanates obtained by this process, optionally in admixture with unreacted starting polyisocyanate or optionally blocked by blocking agents for isocyanate groups, as the polyisocyanate component in the production of polyurethane plastics.

Process for the production of oligomeric polyisocyanates and their use

This invention relates to a new process for the production of polyisocyanates containing isocyanurate groups by partial trimerization of the isocyanate groups of organic polyisocyanates comprising

Process for the production of polyisocyanates containing isocyanurate

The present invention relates to a process for coating polyvinyl chloride sheet products, optionally containing plasticizers, with clear coatings which can be hardened under the influence of atmospheric moisture and have a viscosity at 23.degree. C. of from about 60 to 2500 mPa.s, and which contain (a) at least one polyisocyanate which is liquid at room temperature, (b) up to about 15% by weight, based on the coating of solvents, and optionally (c) conventional auxiliary agents and additives, and to the coated products produced therefrom.

Use of clear coating based on organic polyisocyanates for coating sheet

The present invention is related to compositions containing isocyanatosilanes as additives to increase the stability in storage of liquid or pasty, clear or pigmented compositions containing polyurethane prepolymers with free isocyanate groups and optionally containing solvents.

Compositions containing isocyanatosilanes as additives to increase the

The present invention relates to a process for the preparation of novel isocyanato-isocyanurates by the catalytic and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl-cyclohexane in a mole ratio of about 1:4 to 4:1, and to the products produced therefrom. The present invention also relates to the use of these products, optionally in blocked form, as the isocyanate component in polyurethane lacquers.

Isocyanato-isocyanurates, and process for the production thereof

The invention relates to a new process for the shatterproof coating of glass surfaces by coating the surfaces with a coating composition based on a two-component system reacting fully to form a polyurethane, the glass surfaces to be coated being coated before application of the coating composition with a physically drying priming lacquer containing a silane adhesion promoter and a catalyst which accelerates hardening of the coating composition and, as binder, a polyurethane polyurea which has a linear molecular structure and which is soluble in lacquer solvents.

Process for the shatterproof coating of glass surfaces

The present invention relates to a process for the production of metal effect lacquerings having improved weather-resistance by the multilayered lacquering of various substrates, using a clear layer as top coat and a lacquer containing metal pigments to form the outer layer of the multilayered lacquering which is covered by the layer of clear lacquer, characterized in that the clear lacquer used is one the main binder of which is a two-component system consisting of:

Method of producing metal effect lacquerings and sheets treated with

The present invention relates to thermally cross-linkable coating compositions which are liquid and stable in storage at room temperature and which contain combinations of dialkyl-malonate-blocked polyisocyanates and organic polyhydroxyl compounds as binders and, optionally, auxiliaries and additives, being characterized in that the binder comprises:

Coating compositions and process for the production of polyurethane

A process for improving the water vapor permeability of polyurethane coatings by incorporating a hydroxy alkyl amine, an alkoxylated amine or the salt of either with an inorganic or organic acid into the coating composition is taught. Coating compositions including this water vapor diffusion enhancing additive are also taught as is a process for coating water vapor permeable substrates.

Use of hydroxyl alkyl amines optionally containing ether groups or their

Isocyanate mixtures which are stable in the absence of moisture, and are curable by atmospheric moisture and which have low viscosities are obtained by mixing polyisocyanates containing biuret, allophanate or urethane bonds and functionalities in excess of 2 with monoisocyanates. These mixtures are used to coat substrates and the exposure of the coated substrates to atmospheric moisture results in cured coatings.

Isocyanate mixture and its use as binder in one-component lacquers

This invention discloses mixtures for use as binders for solvent-free lacquers which are liquid at room temperature, can be prepared in the presence of moisture and have good light stability and resistance to weather. The mixtures contain:

Growing community of inventors

Leverkusen, Germany

Gerhard Mennicken