| http://www.w3.org/ns/prov#value | - --(X1 --R2 --X1 --R1)p --} where p is an integer from 1 to 5, produced by the reaction of a polyol with an isocyanate having the structure OCN-R2 -NCO to produce a segment having a molecular weight of from 500 to 4,000, preferably 800 to 2,000; R1 is linear or branched alkylene group having 2to 12 carbon atoms or an arylene group having 6 to 10 carbon atoms; X1 is ##STR18## R2 is an organic group
|
