| http://www.w3.org/ns/prov#value | - In fact, very good results are obtained when the polyol is derived from lactone, especially a caprolactone by which is meant a lactone having 7 atoms, including the oxygen atom, in the lactone ring, the free valencies of the ring carbon atoms generally being satisfied by hydrogen atoms although substitution by lower alkyl groups having one to four carbon atoms may also be tolerable.
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