C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/345, 400/810
C08G 75/00 (2006.01) C08G 75/14 (2006.01) C08L 81/00 (2006.01) C08L 81/04 (2006.01) C09K 3/10 (2006.01)
Patent
CA 1176796
ABSTRACT 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 at least one mercapto-functional organic compound which contains an average of at least two mercapto groups 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 compound selected from the group consisting of Fe(CO)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, such as 2-ethyl- hexanoic 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. 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.
364877
Dow Corning Corporation
Gowling Lafleur Henderson Llp
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