| http://www.w3.org/ns/prov#value | - Polymers having the repeating mer unit ##STR10## wherein n is an integer substantially greater than 10; wherein R1, R2, R3 and R4 are the same or different essentially hydrocarbon groups, R1 and R2 being separate groups or parts of a cyclic group and R3 and R4 being separate groups or parts of a cyclic group; R5 is an essentially hydrocarbon group which is the residue of a polyol R5 (OH)a wherein
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