Bayer Aktiengesellschaft

Eckhard De Cleur

Hans J Kreuder

Hans Rudolph

Rolf Dhein

Rolf-Volker Meyer

Manfred Schonfelder

Josef Pedain

Kurt Findeisen

Kuno Wagner

Hanns P Muller

Walter Schafer

Frank Wingler

Wolfram Mayer

Richard Muller

Wofram Mayer

New amidine/isocyanate adducts are particularly useful as catalysts for hardening epoxy resins, in particular pulverulent coating compositions based on epoxy resins. New bicyclic amidines are excellent starting materials for manufacturing these amidine/isocyanate adducts.

Bicyclic amidine-isocyanate adducts

Tetrahydropyrimidine-isocyanate addition products

Bicyclic amidines

This invention relates to new ammonium salts of .alpha.-ketocarboxylic acids, to their use for the production of amines in situ by photochemical decomposition and to photochemically hardenable coating compositions containing these ammonium salts.

Ammonium salts of .alpha.-ketocarboxylic acids

Compounds having a melting point above 40.degree. C. which compounds contain uretone imine groups and which are substantially free from volatile isocyanate blocking agents which are split off under stoving conditions are excellent crosslinking agents for pulverulent coating compositions based on hydroxyl groups-containing polymers.

Pulverulent coating composition

Object of the invention are pulverulent coating compositions which are obtained if the coating compositions contain as crosslinking agents polyglycidyl esters of polycarboxylic acids and as binders polyesters from polyalcohols and predominantly aromatic polycarboxylic acids which contain free carboxyl groups.

Pulverulent coating agents

The invention relates to a pulverulent coating material prepared from a polyester which contains free carboxyl groups of succinic acid and cross-linking agents which react with carboxyl groups at elevated temperatures.

Pulverulent coating materials

Powdered coating agent for use in the sprayed powder process comprising a mixture of

Pulverulent binders

Pulverent coating materials containing polyoxazolines and polyesters

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Duisburg, Germany

Eckhard De Cleur