Narrowing of poly (tetramethylene ether) glycol
US6355846B1 · kind B1 · utility
1Cited by
4References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 17, 2000 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Oct 17, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for producing a poly(tetramethylene ether) glycol (PTMEG) or copolymer having a narrowed molecular weight ratio of 1.9 to 2.07 and a dispersity of 1.2 to 1.65 from a starting PTMEG or copolymer with a broader molecular weight distribution having a dispersity of 1.9 to 2.3 and a molecular weight ratio of 2.3 to 2.6 is provided by feeding the PTMEG or copolymer and an effective amount of an inert solvent to a stripping apparatus and stripping at a temperature of 150 to 220 degrees C. and a pressure of 0.5 to 5 mm of mercury.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.