High-purity biphenyltetracarboxylic dianhydride and process for producing the same
US7459570B2 · kind B2 · utility
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2Claims
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Key dates
| Filing date | Jan 9, 2004 |
| Grant date | Dec 2, 2008 |
| Priority date | — |
| Expiry date | May 19, 2025 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/42
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
There is provided biphenyltetracarboxylic dianhydride containing biphenyltetracarboxylic monoanhydride in an amount of not more than 0.4%. By using the biphenyltetracarboxylic dianhydride as a raw material, it is possible to produce polyimide or polyamic acid having an increased molecular weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.