Process for the preparation of polyaddition compounds

• Main Authors: SANDERS, JOSEF, LAAS, HANS-JOSEF, SOJKA, BERND, GRAHL, MICHAEL, HALPAAP, REINHARD, FISCHER, WOLFGANG
• Format: Patent
• Language: English; Polish
• Published: 29.07.2011
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS THEREFOR; WOODSTAINS

Polyisocyanates (A) with uretdione groups having mean isocyanate functionality of at least 2.0, optionally other diisocyanates and/or polyisocyanates (B) (70 wt.% or less), polyol(s) (C) and optionally other isocyanate-reactive monofunctional compounds (D) (40 wt.% or less) are reacted in the presence of at least one bismuth-containing catalyst to form polyaddition products containing uretdione groups. Polyols have molecular weight of 62-2000 and mean functionality of at least 2.0. The equivalent ratio of isocyanate groups to isocyanate-reactive groups is 1.8:1-0.6:1. Independent claims are included for the following: (1) polyaddition products containing uretdione groups; and (2) powder coating which has a matt surface prepared from the above-mentioned polyaddition products containing uretdione groups in combination with at least one polyol having hydroxyl number of 20-40 mgKOH/g and at least one polyol having hydroxyl number of 200-300 mgKOH/g.