| http://www.w3.org/ns/prov#value | - wherein R1 is a monovalent organic group selected from a group consisting of an alkyl group, an aryl group, an aralkyl group, an alkoxy group and an aryloxy group, and a is 0, 1 or 2, and b is 1, 2 or 3, provided a+b???3, or a mixture of such hydropolysiloxane compounds.
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