| 摘要 |
<p>A process for making polyurethaneureas using cryogenic mixing is disclosed. 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 °C, forming a powder from said isocyanate prepolymer, adding at least one chain extender and/or chain terminator, and warming said powder to at least about room temperature to produce a polyurethaneurea. Such polyurethaneureas are useful for making spandex and, ultimately, various types of clothing.</p> |
