| http://www.w3.org/ns/prov#value | - preferred L which forms a urea moiety is --NH--. The polyalkylene oxide derivative of Formula III in which L is --O-- and Y is a halogen such as Cl can be obtained by reacting a polyalkylene oxide with phosgene as described in the above-cited U.S. Pat. No. 5,122,614. The polyalkylene oxide derivative of Formula III in which L is --NH-- and the halogen Y is Cl can be obtained by reacting a polya
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