| 摘要 |
PCT No. PCT/US96/18142 Sec. 371 Date Jul. 15, 1997 Sec. 102(e) Date Jul. 15, 1997 PCT Filed Nov. 13, 1996 PCT Pub. No. WO97/18252 PCT Pub. Date May 22, 1997A process for making polyurethaneureas using cryogenic mixing is provided. Such polyurethaneureas are useful for making spandex and, ultimately, various types of clothing. The process involves cooling an isocyanate prepolymer or the like to a temperature of less than about -100 DEG C., forming a powder from the isocyanate prepolymer, adding at least one chain extender and/or chain terminator, and warming the powder to at least about room temperature to produce a polyurethaneurea. Such polyurethaneureas are useful for making spandex and, ultimately, various types of clothing.
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