| 摘要 |
Compositions containing certain polymeric alkoxysilanes and refractory materials. The polymeric alkoxysilanes comprise a polymer network having the average formula: <IMAGE> wherein each R is an independently selected hydrocarbon or hydrocarbon ether radical, each R1 is an independently selected hydrocarbon radical, and all of said radicals are free of aliphatic unsaturation: a has a value from 1 to 3; and b has a value from 0.0001 to 1.0. These polymers are made by reacting an alkoxysilane of the formula Si(OR)a O4-a/2 with water and with an organosulfonic acid of the formula R1SO3H. The compositions are useful for the preparation of investment casting molds.
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