| abstract |
A curable sealant composition includes a polysulfide having an -SH group, an isocyanate component, and a catalyst component including a first catalyst and an imidazolium catalyst, wherein the first catalyst has the structure (I): wherein R 1 is in the 2, 3, 4, 5, or 6 position and R 1 is chosen from H, CH 3 , CH 2 CH 3 , COCH 3 , OCOCH 3 , COCH 2 CH 3 , OCOCH 2 CH 3 , OCH 3 , and OCH 2 CH 3 . R 2 is chosen from H, CH 3 , and CH 2 CH3. The imidazolium catalyst has the structure (II): wherein each of R 3 and R 5 is independently an organic radical having 1 to 20 carbon atoms, each of R 4 , R 6 , and R 7 is independently H or an organic radical having 1 to 20 carbon atoms, and A - is an anion. |