Patent ID: 7019088

Claim:
A hardenable mass containing uretdione groups containing: (A) a linear or branched bonding agent component which has at least one of terminal and side chain hydroxyl groups, a hydroxyl number of 25 to 400, and an average molecular weight of 400 to 20,000, and which is present in a fluid or viscous form above the reaction or processing temperature; (B) a polyaddition compound which is present in a fluid or viscous form above the reaction or processing temperature, contains uretdione groups and is based on at least one aliphatic and/or cycloaliphatic diisocyanate; and (C) at least one active or reactively activatable Lewis acid catalyst; said bonding agent component (A): (A1) being free of carboxyl groups, or (A2) having a concentration of carboxyl groups less than a concentration of active catalyst (C), or (A3) having a concentration of carboxyl groups higher than a concentration of active catalyst (C), and an amount of reactive agent is added to block an amount of carboxyl groups in order to realize a concentration of active catalyst (C); and wherein: (C1) in the case of (A1) and (A2), the use of Lewis acid carboxylates as catalysts is excluded.