Methods of improving shelf life of silicone elastomeric sealant
AssigneeDow Corning Corporation
InventorsJerome M. Klosowski, Michael D. Meddaugh
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Abstract
The method of this invention produces an elastomeric silicone sealant having an improved shelf life. The sealant comprises an alkoxysilethylene ended polydiorganosiloxane polymer, an alkoxytrialkoxysilane crosslinker, and a titanium catalyst.
Claims6
A method of producing an endcapping composition comprising (A) mixing 1 mol of a composition (a) of the formula ##STR22## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, and a is 0 or 1, with greater than 2 mols of a composition (b) of the formula ##STR23## where R is as stated above and c is from 1 to 6, in the presence of a platinum catalyst and allowing to react, then,
- (B) optionally stripping the excess composition (b) from the product, to give an endcapping composition of the formula ##STR24## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and c is 1 to 6.
The product having the formula, ##STR25## where R is methyl, ethyl, propyl, phenyl, or trifluoropropyl, R" is methyl, ethyl, propyl, or butyl, a is 0 or 1, and c is 1 to 6.
Dependencies are inferred from the claim text.