| http://www.w3.org/ns/prov#value | - The most preferred diisocyanate prepolymers are those containing polyethylene glycol, but include polyether polyols such as polytetramethylene glycol, polypropylene glycols. polybutylene glycols, and random or block copolymers of these, and polymer polyols such as those disclosed in U.S. patent application Ser.
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