| http://www.w3.org/ns/prov#value | - It is also possible to quaternize before polycondensing; that is to say, it is possible to quaternize the macrodiol of formula (II) so as to attach an R4 monovalent radical to the nitrogen atom (the meaning of R4 is given below but here, preferably, R4 is an alkyl radical); then the quaternized macrodiol is caused to react with the diisocyanate so as to produce a quaternized macrodiisocyanate; thi
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