| http://www.w3.org/ns/prov#value | - The preferred polyurethane has the following structural formula: ##STR3## where n1 is an integer selected to give a molecular weight between 500-5,000, n is an integer selected to give a number average molecular weight of 120,000 to 180,000 units, and a weight average molecular weight of 285,000 to 335,000 molecular weight units, and x and y are the relative proportions of 1,4-butane diol to PTMEG
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