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公开(公告)号:US4877829A
公开(公告)日:1989-10-31
申请号:US209406
申请日:1988-05-19
CPC分类号: C08G18/69 , C04B41/009 , C04B41/4884 , C04B41/52 , C04B41/63 , C04B41/71 , C08G18/0885 , C08G18/36 , C08G18/6547 , C08G18/7664 , C08G18/8019 , E01D19/083 , C04B2111/00267 , C04B2111/27 , Y10T428/31551 , Y10T428/31598
摘要: Novel polyurethane formulations especially useful as membranes for the protection of bridge deckings. The polyurethane is prepared by mixing two components, A and B. Component A comprises castor oil, a low molecular weight polyol having a molecular wieght between 92 and about 200, preferably with an elastomer. Component B is a modified MDI, being either (i) a mix of 4,4'- and 2,4'-isomers of diphenylmethane diisocyanate or (ii) a diphenylmethane diisocyanate and its reaction product with a low molecular weight poly(oxyalkylene).