[C:1]([O-:14])(=[O:13])[CH2:2][CH2:3][CH2:4]CCCCCCCC.[C:15]([O-:28])(=[O:27])[CH2:16]CCCCCCCCCC.C([Sn+2]CCCC)CCC.C1C=CC(C(N=C=O)N=C=O)=CC=1.C1C(CC2C=CC(N=C=O)=CC=2)=CC=C(N=C=O)C=1.[O:70]1[CH2:74][CH2:73][CH2:72][CH2:71]1>>[CH2:4]([OH:27])[CH2:3][CH2:2][CH2:1][OH:14].[C:74]([OH:70])(=[O:13])[CH2:73][CH2:72][CH2:71][CH2:16][C:15]([OH:28])=[O:27]0.5 g of dibutyltin dilaurate was added to a 60% strength by weight solution of 112.0 g of toluylene diisocyanate and 158.3 g of diphenylmethane 4,4'-diisocyanate in tetrahydrofuran, and the mixture was then heated to 60° C. At this temperature, a 60% strength by weight solution of 390 g of a polyesterol obtained from 1,4-butanediol and adipic acid and having a molecular weight of 1000, 167.5 g of a polyesterol obtained from 1,6-hexanediol, adipic acid and terephthalic acid, 29.4 g of polydimethylsiloxane having hydroxyl functional groups and a molecular weight of 900, 3.17 g of trimethylolpropane, 3.13 g of methyldiethanolamine, 72 g of diethoxylated bisphenol A and 27 g of 1,6-hexanediol in tetrahydrofuran was metered in over 2 hours.
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