| http://www.w3.org/ns/prov#value | - R and second monomeric units of by the following formula: wherein R, R1, R2 and R3 are independently selected from the group consisting of hydrogen and alkyl groups having 6-18 carbon atoms, with the proviso that at least one of R1, R2 and R3 is an alkyl group, with the amount of said first units being 10-50% by weight based on said second units. 6.
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