OCC[O:4][C:5](=[O:8])[CH:6]=[CH2:7].CC(C1[CH:18]=[C:17]([OH:19])C=CC=1O)(C)C.CN(C)CCCCCCN(C)C.CCCCCCCCCCCC(O[Sn](OC(CCCCCCCCCCC)=O)(CCCC)CCCC)=O.C(N=C=O)CCCCC[N:76]=[C:77]=[O:78]>C1(C)C=CC=CC=1>[C:5]([OH:8])(=[O:4])[CH:6]=[CH2:7].[NH2:76][C:77]([O:19][CH2:17][CH3:18])=[O:78]
Under a flow of nitrogen, 200 g of hydroxy polyester (Uralac ZW 3896 P) were dissolved in 300 g of toluene at 100° C. Then, 39.5 g hydroxyethylacrylate, 0.3 g MTBHQ, 0.30 g N, N, N′, N′-tetramethyl-1,6-hexane diamine and 0.03 g DBTL were added. The solution was cooled to 70° C., and 58.7 g of hexamethylene diisocyanate was added in 2.5 hours. Thirty minutes after the addition was finished, the toluene was removed by vacuum distillation at 125° C. to yield solid urethane acrylate.
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