| abstract |
Compositions which are stable in the absence of oxygen are formed by mixing the following substantially in the absence of oxygen n (A) 100 parts by weight of at least one mercapto-functional organic compound which contains an average of at least two mercapto groups per molecule; n (B) 0 to 200 parts by weight of at least one filler; n (C) a catalytic amount, preferably from 0.1 to 6 parts by weight, of an iron carbonyl compound selected from the group consisting of Fe(CO) 5 , Fe 2 (CO) 9 , Fe 3 (CO) 12 , dicyclopentadienyldiiron tetracarbonyl, butadieneiron tricarbonyl and cyclohexadieneiron tricarbonyl; and n (D) 0.1 to 6 parts by weight of an acid, such as 2-ethylhexanoic acid, which meets a particular set of criteria. n The compositions polymerize or cure to form higher molecular weight products at room temperature upon exposure to oxygen. These compositions are especially useful as coatings because they possess a rapid rate of surface cure. Elastomeric sealant compositions can be prepared which rapidly become tack-free at the surface and are less prone to surface contamination by foreign matter such as dust during cure. |