Process for producing polyaddition compounds containing uretdione groups

A process for producing uretdione group-containing polyaddition products, which are solid below 40° C. and liquid above 125° C., which comprises reacting in a static mixer

• A) a uretdione group-containing polyisocyanates with an average isocyanate functionality of at least 2.0, and
• B) up to 70 wt. %, based on the total weight of components A) and B), of a diisocyanate other than A), with
• C) a polyol having a number average molecular weight of 62-2000 and an average functionality of at least 2.0, and
• D) up to 40 wt. %, based on the total weight of components C) and D), of a monofunctional isocyanate-reactive compound,
• at an equivalent ratio of isocyanate groups to isocyanates-reactive groups of 1.8:1 to 0.6:1 wherein the static mixer contains least one mixing zone and a subsequent reaction zone.