| abstract |
The present invention provides a novel solvent-free two-component polyurethane coating and a process for the preparation thereof for producing a good coating without yellowing. The coating agent is a polyisocyanate component having a viscosity at 23 ° C. of 2,000 to 150,000 mPas, an NCO content of 14 to 23% by weight, and a theoretical average NCO functionality of at least 2.8; A polyol component having an average OH functionality of less than 3, a viscosity at 23 ° C. of 5,000 to 150,000 mPas, and a hydroxyl value of 400 to 700 mg KOH / g; And binder mixtures optionally containing one or more catalysts. |