Method of making a biphenol dianhydride composition, method for purification of a biphenol dianhydride, and poly(etherimide)s derived from the biphenol dianhydride
US12338222B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2020 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Oct 7, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1071
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method of making a biphenol dianhydride composition includes heating a first solution including a biphenol tetraacid of the formula (I) wherein Ra, Rb, p and q are as defined herein; at least one of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, iron ions, phosphate ions, sulfate ions, chloride ions, nitrate ions, and nitrite ions; and a non-halogenated solvent. The N first solution is heated under conditions effective to provide a second solution including the corresponding biphenol dianhydride, the at least one of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, iron ions, phosphate ions, sulfate ions, chloride ions, nitrate ions, and nitrite ions, and the non-halogenated solvent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.