Bayer Aktiengesellschaft

Hans-Joachim Kreuder

Josef Pedain

Christian Wamprecht

Reinhard Halpaap

Rolf-Volker Meyer

Manfred Bock

Gerhard Klein

Dieter Arlt

Hanns P Muller

Walter Schafer

Jurgen Meixner

Wolfgang Schultz

Rainer Rettig

Erwin Hohl

Wolfgang Ebert

Knud Reuter

Peter Hohlein

Roland Richter

Armin Zenner

Henning Klussmann

Peter Ho/ Hlein

The present invention relates to a powder coating composition for the production of non-yellowing flexible coatings which is solid below 30.degree. C. and liquid above 120.degree. C. and contains a mixture of

Powder coating compositions and their use for coating heat-resistant

The present invention relates to powder coating compositions wherein the binder contains copolymers which are solid below 30.degree. C., prepared from olefinically unsaturated compounds and have a weight-average molecular weight (M.sub.w) of 1500 to 75,000, a content of free hydroxyl groups of 0.2 to 6.0% by weight and a content of intramolecular carboxylic acid anhydride groups (calculated as C.sub.4 H.sub.2 O.sub.3) of 1 to 30% by weight.

Powder coating compositions containing copolymers having hydroxyl and

The present invention relates to compositions which are storage stable at room temperature and contain

Compositions of cyclic isourea component with carboxyl component

The present invention relates to coating compositions in pulverulent form which are solid below 30.degree. C. and liquid above 150.degree. C. and contain

Epoxide and anhydride groups-containing copolymer with polyol

The present invention relates to powder coating compositions which are solid below 3O.degree. C. and contain a mixture of

Powder coating compositions

The present invention relates to a process for the production of powder coating compositions having a glass transition temperature of 20.degree. to 80.degree. C. by

Powder coating compositions, a process for their production and their

The present invention relates to powder coating compositions which can be cured in the presence of heat and/or high energy radiation and contain polyurethanes which melt at temperatures of 50.degree. to 180.degree. C., have 3 to 10% by weight of olefinic double bonds in the form of (meth)acryloyl groups (calculated as .dbd.C.dbd.C.dbd., molecular weight=24) and are based on the reaction product of

Powder coating compositions containing polyurethanes having

Polyesters useful as a binder or a component of a binder for powder lacquers and which contain hydroxyls, carboxyls or both and which have an acid value of up to 50, a hydroxyl value of up to 200 and a sum of hydroxyl value and acid value of from 20 to 200 is produced by reacting:

Process for the production of polyesters and their use as binder or

The present invention relates to a powder lacquer containing a mixture of

Powder lacquer and its use for coating heat-resistant substrates

The present invention is directed to isocyanato isocyanurates prepared from diisocyanates which contain a sterically unhindered isocyanate group bound to a primary aliphatic carbon atom and a sterically hindered isocyanate group which is bound to a tertiary carbon atom forming part of a cycloaliphatic ring system, said diisocyanate having an NCO content of about 20 to 50% by weight. The present invention is further directed to a process for preparing these isocyanato isocyanurates by catalytic trimerization and the use of the isocyanato isocyanurates in a process for the production of polyisocyanate polyaddition products, preferably two-component polyurethane stoving lacquers.

Isocyanurate group-containing polyisocyanates

The present invention is directed to a process for the production of polyisocyanates containing isocyanurate groups by trimerizing a mixture of aliphatic-cycloaliphatic diisocyanates having a sterically unhindered isocyanate group bound to a primary aliphatic carbon atom and a sterically hindered isocyanate group bound to a tertiary carbon atom which forms a part of a cycloaliphatic ring system and 1,6-diisocyanatohexane. The present invention is also directed to the polyisocyanates containing isocyanurate groups produced according to this process and to their use, optionally in blocked form, as an isocyanate component in the production of polyisocyanate polyaddition products, preferably polyurethane lacquers.

Tertiary polyisocyanate derivatives

Cyclic amidines which are modified by the incorporation of additional polar groups, may be used as catalysts for hardening heat-curable resin compositions comprising polyepoxides and optionally carboxyl group-containing polymers. Such amidine catalysts yield a high reactivity, an excellent storage stability and result in elastic coatings which show a high gloss and a good resistance to solvents.

Cyclic amidines useful as catalysts in the hardening of epoxide resins

Cyclic amidines, a process for their production and their use as

The reaction of polymers containing carboxyl groups with organic nitrogen bases which have certain structural features leads to highly reactive products which are eminently suitable as binder components for powder lacquers which may be hardened with polyepoxides.

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Toenisvorst, Germany

Hans-Joachim Kreuder