| 摘要 |
PURPOSE: Provided are curable organo-silicone compositions and a method of making them, in particular, alkenyl-functional poly(siloxaneacrylates) with pendant oxycarbonylethyleneimino-containing organic groups. These poly(siloxane-acrylates) can be cured into elastomers which have low or minimal weep characteristics when exposed to power train oils. CONSTITUTION: The poly(siloxane-acrylate) elastomers with low weep characteristics are formed by the steps of: (A) forming an amine functional alkenyl-containing siloxane by mixing and heating: (a) a polydiorganosiloxane, (b) an amino-functional silane hydrolyzate, (c) an alkenylorganosiloxane, and (d) a base equilibration catalyst, then (B) reacting, at room temperature, the amine functional alkenyl-containing siloxane with an acrylate to form a curable alkenyl-containing poly(siloxane-acrylate) with oxycarbonylethyleneimino-containing organic groups, and (C) curing the alkenyl-containing poly(siloxane-acrylate) to form an poly(siloxane-acrylate) elastomer.
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