Method of forming semicrystalline polyetherimide, and polyetherimide-containing composition
US12391802B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 7, 2020 |
| Grant date | Aug 19, 2025 |
| Priority date | — |
| Expiry date | Mar 20, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a method of forming a semicrystalline polyetherimide, a solvent mixture is combined with an amorphous polyetherimide in a weight ratio of 1:1 to 50:1, respectively, to form a first dispersion. The solvent mixture includes dichloromethane and a C1-C6 alkanol in a weight ratio of 0.5:1 to 15:1, respectively. The first dispersion is agitated to form a second dispersion containing a semicrystalline polyetherimide, and the semicrystalline polyetherimide is isolated from the second dispersion. The isolated semicrystalline polyetherimide exhibits a melting point in a range of 230 to 300° C. Also described is a composition that includes a polyetherimide, dichloromethane, and a C1-C6 alkanol in specific ratios.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.