Non-swelling sealing material and method of preparing the same

摘要

1 mole of 4,4'-diphenylmethane diisocyanate is mixed with 2 moles of polyoxypropyelene glycol monoether having mean molecular weight of 2800 while adding 0.03 % of tin octylate as a catalyst, and reaction is made at 80 DEG C for three hours for obtaining a synthetic. This synthetic is employed as a main component and blended with a filler and the like for obtaining a sealing material composite. This composite causes no swelling of a gasket forming a flange part of a trunk lid of an automobile.