Method of making a biphenol dianhydride composition, method for purification of a biphenol dianhydride composition, and poly (etherimides) derived from the biphenol dianhydride
US12258448B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 29, 2020 |
| Grant date | Mar 25, 2025 |
| Priority date | — |
| Expiry date | Mar 9, 2042 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1064
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for purification of a biphenol dianhydride composition includes contacting the biphenol dianhydride composition with a halogenated solvent to form a solution, and isolating the purified biphenol dianhydride composition from the solution. A method of making a biphenol dianhydride composition including contacting a first solution including a biphenol tetraacid, and at least one of sodium ions, potassium ions, calcium ions, zinc ions, aluminum ions, iron ions, nickel ions, titanium ions, chromium ions, magnesium ions, manganese ions, copper ions, phosphorus ions, phosphate ions, sulfate ions, chloride ions, bromide ions, fluoride ions, nitrate ions, and nitrite ions, with a halogenated solvent to provide a second solution, heating the second solution to form the corresponding biphenol dianhydride, and isolating the purified biphenol dianhydride. The biphenol dianhydride is particularly useful for forming poly(etherimides), which can be used in a variety of articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.