| 摘要 |
PCT No. PCT/JP90/00578 Sec. 371 Date Jan. 9, 1991 Sec. 102(e) Date Jan. 9, 1991 PCT Filed May 2, 1990 PCT Pub. No. WO90/13586 PCT Pub. Date Nov. 15, 1990.The present invention is a room temperature curable polyurethane composition comprising as a curable component a polyurethane prepolymer having terminal isocyanate groups obtained by reacting an organic polyisocyanate and a polyol comprising as the main component a polyoxyalkylenepolyol having a molecular weight per hydroxyl group of from 1,500 to 15,000 and a total unsaturation degree of at most 0.07 meq/g. The above polyoxyalkylenepolyol having a molecular weight per hydroxyl group of from 1,500 to 15,000 and a total unsaturation degree of at most 0.07 meq/g, is produced by ring-opening addition polymerizing an alkylene oxide to an initiator, preferably by means of a double metal cyanide complex catalyst. By curing this curable polyurethane composition by moisture in air, a highly flexible cured product will be obtained. Further, by curing this curable polyurethane composition wherein a high molecular weight polyoxyalkylenepolyol is used as a curing agent, a highly flexible similar cured product is obtainable. This curable polyurethane composition is useful as sealing materials or water-proof materials.
|
