| 摘要 |
Disclosed are certain moisture curable prepolymers formed by the reaction of diphenylmethane diisocyanate (MDI) with conventional polyether polyols to produce sealants and coatings exhibiting excellent combinations of physical properties, most notably, high tensile strength, high tear resistance, and high elongation. These combinations of physical properties in the moisture-cured polymer are superior to those obtained from prepolymers of the so-called "low unsaturation" polyether polyols. The moisture curable prepolymers offer improved polymer properties, reduced viscosity, and lower raw materials cost in relation to the prior art prepolymers based on low unsaturation polyether polyols.
|
