| 摘要 |
<p>A water-bearing structure, such as a sewer, water line or aqueduct, as sealed to prevent or minimize the leakage of water into or from said structure by placing at the locus of said leakage a fluid sealing composition comprising a watermiscible mixture of controlled molecular weight isocyanate-termi-nate polyoxyethylene urethane prepolymers in a compatible, water-miscible s ?et, and ?uring said prepolymer by reaction thereof with water to form a poly(urethane-urea) seal at said locus.</p> |
