Highly reactive polyurethane compositions containing uretdione groups

A polyurethane composition, comprising a mixture of:

• (a) a reaction product of (a1) a polyisocyanate comprising at least two NCO groups and (a2) a uretdione-group-containing polyisocyanate with (a3) an oligomeric or (a4) polymeric polyol, optionally (a5) a low molecular mass substance having at least one OH group, and optionally (a6) a blocking agent, wherein the polyisocyanate comprises isophorone diisocyanate and the uretdione-group-containing polyisocyanate comprises dimerized isophorone diisocyanate;
• (b) a catalyst;
• (c) an epoxide that is reactive toward an acid group;
• (d) optionally, an acid in monomeric (d1) or polymeric form (d2);
• and
• (e) optionally, at least one of an auxiliary (e1) and an additive (e2),
• wherein
• the catalyst (b) comprises a C1-C4 tetraalkyl ammonium benzoate;
• wherein the catalyst (b1) is present in an amount of from 0.001 to 3% by weight, based on a total weight of the composition,
• wherein the epoxide is present in an amount of from 0.1 to 10% by weight, based on the total weight of the composition,
• wherein the acid (d) in monomeric (d1) or polymeric (d2) form is optionally present in an amount of from 0.1 to 10% by weight, based on the total weight of the composition, and
• wherein the composition forms a thermoplastic polymeric material when reacted either alone or with other polymers.