Method for producing polybenzoxazole resin
US9890250B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 19, 2015 |
| Grant date | Feb 13, 2018 |
| Priority date | — |
| Expiry date | May 19, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing a polybenzoxazole resin, in which even when a polybenzoxazole precursor is heat treated at a low temperature, a polybenzoxazole resin that is excellent in mechanical properties, such as tensile elongation, and in chemical resistance, is suppressed in terms of coloration, and is high in transparency can be produced. A polybenzoxazole resin is formed by heating a polybenzoxazole precursor which is obtained by allowing an aromatic diaminediol and a diformyl compound or a dicarboxylic acid dihalide, to react with each other in a solvent containing an amide compound or a urea compound each having a specified structure, at 120° C. to 350° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.