| http://www.w3.org/ns/prov#value | - No. 907,596, now U.S. Pat. No .4,156,764 issued May 29, 1979, and can be described by formula (IV) set out hereafter: ##STR5## wherein independently each x is an integer at least equal to 1 and is a maximum equal to the number of replaceable hydrogen atoms associated with the R arene radical, y is an integer at least equal to 1, R' is hydrogen or an organosilyl group, i.e. (R'''3 -S--, R''' being
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