Process for the fractionation of polyoxyalkylene block copolymers
US5800711A · kind A · utility
16Cited by
22References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Oct 18, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/30
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for the fractionation of polyoxyalkylene block copolymers wherein the polydispersity of the polyether is reduced. The fractionation process, which removes lower molecular weight species such as polyoxyalkylene homopolymer, truncated polyoxyalkylene diblock polymers, or other reaction byproducts, comprises salt extraction and liquid phase separation to provide a product with a narrower molecular weight distribution, lower degree of unsaturation, and distinctly different physical characteristics compared to the starting material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.