WATER-SWELLABLE SEALANTAND METHOD OF PREPARATION

摘要

PCT No. PCT/JP85/00359 Sec. 371 Date Jan. 29, 1986 Sec. 102(e) Date Jan. 29, 1986 PCT Filed Jun. 25, 1985 PCT Pub. No. WO86/00328 PCT Pub. Date Jan. 16, 1986.Water-swellable moisture-curing one-package polyurethane sealant which includes (1) a water-swellable polyurethane prepolymer having 1.5-10% terminal NCO group content obtained by reacting polyisocyanate with polyoxyalkylenepolyol having 50-90% of oxyethylene units based on polyalkylene chain molecular weight (2) non water-swellable polyurethane prepolymer having terminal NCO groups obtained by reacting polyisocyanate with polyoxyalkylenepolyol having 3-4 carbon atom oxyalkylene units, and (3) a filler. The sealant exhibits has been improved storage stability.