Low temperature process for making polyurethaneureas
US5879596A · kind A · utility
11Cited by
4References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1997 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Jul 15, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S528/906
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A 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.degree. 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.