| http://www.w3.org/ns/prov#value | - R2 and R3 each is different and is an alkyl group of from 1 to 4 carbon atoms and each oxyalkylene radical can be any combination of repeating oxyalkylene units to form block or random copolymers; R4 is the same as R2 or R3 ; R5 is hydrogen or ##STR13## where R7 is hydrogen or an alkyl group of from 1 to 5 carbon atoms; and R6 is a divalent alkylene radical of from 1 to about 12 carbon atoms which
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