| http://www.w3.org/ns/prov#value | - The silicon atom in the divalent hydrocarbon group of R12 can be present as a group containing a straight chain or cyclic organosiloxane or organosilylene group within the backbone of R12, for example, as follows: ##STR12## wherein in said formulas R17 is independently an alkyl group or an aryl group, R18 is independently an alkylene group or an arylene group, and n is an integer of 0 to 10, typic
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