Patent ID: 8217107

Claim:
A curable sealant composition comprising: a) at least one silanol-terminated diorganopolysiloxane; b) at least one crosslinker for the silanol-terminated diorganopolysiloxane(s) selected from the group consisting of cross-linkers possessing the general formula: (R 7 O)(R 8 O)(R 9 O)(R 10 O)Si where R 7 , R 8 , R 9 and R 10 are independently chosen monovalent C 1 to C 60 hydrocarbon radicals and methyltrimethoxysilane; c) at least one catalyst for the crosslinking reaction; d) a rapid deep-section curing amount of zinc oxide having an average particle size of from about 50 nm to about 70 nm and possessing a surface area of from about 5 to 30 m 2 /gram; e) at least one additional component selected from the group consisting of alkyl-terminated diorganopolysiloxane, filler, UV stabilizer, antioxidant, adhesion promoter, cure accelerator, thixotropic agent, plasticizer, moisture scavenger, pigment, dye, surfactant, solvent and biocide; and, wherein the composition when cured achieves a level of deep-section cure in 24 hours which is at least 7 percent greater and a level of cure in 48 hours which is at least 10 percent greater than an equivalent composition cured over the same period in the absence of zinc oxide.