| http://www.w3.org/ns/prov#value | - Copolymer of a lower olefin and a compound of the formula ##STR6## in which R1, R2 and R3 are independently selected from linear, branched, and cyclic hydrocarbon groups having a total of from eight to twenty-four carbon atoms, except that, where one of R1, R2 or R3 is a phenyl group, the total carbon atoms must be at least nine.
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