Poly(imide-amide) copolymer, article containing poly(imide-amide) copolymer, and display device including same
US9988493B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 17, 2015 |
| Grant date | Jun 5, 2018 |
| Priority date | — |
| Expiry date | Jun 17, 2035 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1039
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A poly(amide-imide) copolymer including a structural unit represented by Chemical Formula 1; a structural unit represented by Chemical Formula 2, and/or an amic acid precursor structural unit which forms the structural unit represented by Chemical Formula 2 through imidization; and a structural unit represented by Chemical Formula 3, and/or an amic acid precursor structural unit which forms the structural unit represented by Chemical Formula 3 through imidization, wherein the poly(amide-imide) copolymer has a modulus of greater than or equal to about 5.5 giga Pascals after being cured, a yellowness index YI of less than or equal to about 3.5, and an increase in yellowness index ΔYI of less than or equal to about 0.7 after being exposed to ultraviolet light for 72 hours:
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.