| http://www.w3.org/ns/prov#value | - A compound of formula I [HO[Si(L)2 -O-]n-Si(OE)2 -R-X-]k T (I) wherein n is 1 to 100, and L is methyl, isopropyl, --CH2 CH2 CF3, tert-butyl, cyclohexyl or phenyl, k is 2 to 4, E is methyl or ethyl, R is ethylene or trimethylene, X is --NHCONH--, --NHCOO--, --S--, --NHCO-- or a direct bond, where the --NH-- groups is attached to R, and T is, when k is 2 and X is a direct bond, --NHCONH--,
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