| http://www.w3.org/ns/prov#value | - total numbers of carbon atoms in R1 and R2 groups and R1 and R3 groups are from 5 to 25, respectively, and n is an integer in such a range as allowing viscosity of said copolymer to be from 10,000 to 120,000 c.p. at 25??? C., for example, from 5 to 30.
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