Herberts Gesellschaft MIT Beschrankter Haftung

E.i. Dupont De Nemours and Company

E.i. Du Pont De Nmeours and Company

Herbertsgesellschaft Gmbh

Ralf Dahm

Hermann Kerber

Walter Schubert

Carmen Flosbach

Klaus Bederke

Friedrich Herrmann

Werner Stephan

Fritz Sadowski

Volker Paschmann

Heinz Dietholf Becker

Heinz-Walter Reifferscheidt

Sandra Kirchgassler

Frank Schnodewind

Dieter Lerch

Astrid T&uuml;ckmantel

Hans-J&uuml;rgen Gawin

Friedrich Hermann

Horst Voss

Apostolos Manassis

Sag stabilized coating compositions containing epoxy-functional crosslinking components

Coating of carboxyl (meth)acrylic copolymer or polyester and urea anti-sag agent prepared in polyepoxide

This invention relates to a composition, and to the preparation and use of thereof said composition being suitable as a rheology influencer for coating media and comprising the reaction product formed by reaction of a mixture of components A, B and C with components D, E and F. Components A, B and C form a mixture wherein component A is one or more (meth)acrylic copolymers and/or one or more polyesters which contain hydroxyl groups. Component B is a copolymer of ethylhexyl (meth)acrylate and one or more hydroxyalkyl (meth)acrylates, as well as .alpha.,.beta.-unsaturated monomers which are different therefrom. Component C is a hydroxy--functional microdispersion which is produced by polymerizing hydroxylalkyl (meth)acrylates in combination with unsaturated monomers in a mixture of polyesters or polyacrylates containing carboxyl and/or hydroxyl groups. Component D is one or more aliphatic polyisocyantes and component E is .epsilon.-caprolactam. The caprolactam partially blocks the polyisocyanate. The component F is one or more primary amines. These ingredients are combined in certain specified amounts. The invention also relates to coating media and to the production of these coating media, which contain said composition as a rheology influencer.

Rheology-influencing composition for coating media

A non-aqueous dispersion containing, in addition to organic solvents,

Hydroxyl group containing binder, a process for its preparation, and its

A rheology-influencing agent for coating media, containing a mixture of a (meth)acrylic copolymer containing hydroxyl groups and/or one or more polyesters containing hydroxyl groups, a hydroxy functional microdispersion obtainable by preparing a solution of one or more film-forming polyesters containing hydroxyl and/or carboxyl groups and/or (meth)acrylic copolymers containing hydroxyl and/or carboxyl groups, the foregoing mixture being reacted with a diisocyanate, and an aliphatic primary monoamine.

Composition suitable as a rheology-influencing agent, a method for its

Previous coating materials lead to the formation of bubbles at high layer thickness and when drying by heating. The new coating materials are intended to be bubble-free when dried at higher layer thicknesses. Aside from pigments and/or extenders, the coating material contains solvents and, if necessary, conventional paint auxiliaries in a vehicle mixture, comprising essentially 60-75% by weight of a hydroxy-functional copolymer, 1-5% by weight of an ester-soluble nitrocellulose and 25-35% by weight of difunctional or multifunctional polyisocyanate. It can be cured without forming bubbles even when applied in thick layers. Use as primer and filler.

Coating material and its use as primer and extender

Growing community of inventors

Wermelskirchen, Germany

Ralf Dahm