| abstract |
This invention is a method of improving the shelf life and oil resistance of silicone elastomeric sealants which are based upon hydroxyl endblocked polydiorganosiloxanes, alkyltrialkoxysilane, and titanate catalyst. The improvement is accomplished by the addition of from 10 to 100 parts by weight of silethylene ended polymer of the formulawhere each R is an organic radical selected from methyl, ethyl, propyl, phenyl, and trifluoropropyl, each R" is methyl or ethyl, Z is an ethylene radical or combination of ethylene radicals and siloxane radicals, a is 0 or 1, and x is of a value such that the polymer has a vicsocity of from 0.05 to 10 Pa.s at 25°C. |