| 摘要 |
Compositions which are stable in the absence of oxygen are formed by mixing the following substantially in the absence of oxygen (A) 100 parts by weight of a mercapto-functional organosiloxane containing an average of at least two mercapto-functional substituents per molecule; (B) 0 to 200 parts by weight of at least one filler; (C) a catalytic amount, preferably from 0.1 to 6 parts by weight, of an iron carbonyl catalyst selected from the group consisting of Fe(C0)5, Fe2(CO)9, Fe3(CO)12, dicyclopentadienyldiiron tetracarbonyl, butadieneiron tricarbonyl and cyclohexadieneiron tricarbonyl; and (D) 0.1 to 6 parts by weight of an acid which meets a particular set of criteria. 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 at room temperature. Elastomeric sealant compositions can be prepared which rapidly become tack-free at room temperature and are therefore less prone to surface contamination by foreign matter such as dust. |
