| http://www.w3.org/ns/prov#value | - in which R is an n-valent organic radical having from 4 to 55 carbon atoms, R and R are each selected from the group consisting of hydrogen and an alkyl radical having from 1 to 8 carbon atoms and n is from 2 to 4, said substrate and layers being bonded together as a unitary structure. 7.
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