Single-component polysulphide based sealant compositions

Details Single-component polysulphide based sealant compositions Single-component polysulphide based sealant compositions

C - Chemistry, Metallurgy

09

K

C09K 3/10 (2006.01)

Patent

CA 2085078

ABSTRACT OF THE DISCLOSURE A one-part polysulfide sealant composition comprises a mercaptan-terminated liquid polysulfide, an oxidising agent to cure the catalyst a desiccant such as a molecular sieve, to keep the composition dry and thus prevent premature activation of the catalyst, and a cure accelerator having an acrylate or methacrylate functionality of 2 or more, preferably an acrylated liquid polysulfide or a polyfunctional methacrylate monomer. The use of this accelerator avoids the need for toxic amounts of barium oxide desiccant and substantially shortens the tack-free time on curing.

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