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US 12,060,456 B2Granted
Polyimide precursor composition and polyimide film, substrate for display device, and optical device prepared by using same
AssigneeLG Chem, Ltd.
InventorsJiyeon Sung, Hoyong Lee, Cheol Jun Song, Kyunghwan Kim, Mi Eun Kang
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Abstract
The present disclosure provides a polyimide film having improved heat resistance and refractive index by using a polyimide precursor composition comprising a diamine of Chemical Formula 1 and an acid dianhydride of Chemical Formula 2 as polymerization components, thereby reducing the difference in refractive index from the upper layer to improve bottom emission efficiency.
Claims14
A polyimide precursor composition comprising, as polymerization components,
- one or more diamines including a diamine of Chemical Formula 1;
- and
- one or more acid dianhydrides including a tetracarboxylic dianhydride of Chemical Formula 2:
- wherein the diamine of Chemical Formula 1 is included in an amount of 70 mol % or more with respect to the total content of the diamines.
1 more element
Dependencies are inferred from the claim text.