prov:value
| - group, a C6 -C20 aryl group, a C7 -C20 aralkyl group or a triorganosiloxy group of the formula: (R')3 SiO--wherein R' is, the same or different, C1 -C20 monovalent hydrocarbon group, X is a hydroxyl group or, the same or different, a hydrolyzable group, a is 0, 1, 2 or 3, b is 0, 1 or 2, and m is an integer of 0 to 18.
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