| http://www.w3.org/ns/prov#value | - A composition as defined in claim 12, wherein X is an alkoxy radical selected from the group consisting of methoxy, ethoxy, and 2-methoxyethoxy wherein R and R2 are divalent alkylene radicals selected from the group consisting of ethylene and propylene, wherein R3 and Q are hydrogen, wherein a is 0, wherein t is 0 or 1, wherein x is 0 or 1 and wherein R4 is a silyl radical of the formula --R--Si--
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