POLYAMIDE-IMIDE FILM, PREPARATION METHOD THEREOF, COVER WINDOW AND DISPLAY DEVICE COMPRISING THE SAME
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Applicant
Ltd. SKC Co.
Representative
Application number
EP22153872A1
Kind
A1
Document number
4036153
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POLYAMIDE-IMIDE FILM, PREPARATION METHOD THEREOF, COVER WINDOW AND DISPLAY DEVICE COMPRISING THE SAME

4036153 - EP22153872A1 - EPO

Application Jan 28, 2022 - Publication Aug 03, 2022

Sang Hun CHOI Jin Woo LEE Jung Hee KI Dae Seong OH Han Jun KIM Sun Hwan KIM Heung Sik KIM

Abstract

The invention relates to a polyamide-imide film excellent in optical properties and mechanical properties, to a process for preparing the same, and to a cover window and a display device comprising the same. There are provided a polyamide-imide film, which comprises a polyamide-imide polymer and has a reduced modulus of a top surface measured by the nanoindentation method according to the ISO 14577-2 standard of 5.6 GPa or more and a haze of 1% or less, a process for preparing the same, and a cover window and a display device comprising the same. The polyamide-imide comprises a dianhydride and a diamine compound that preferably contain a fluorine-containing substituent. A first dicarbonyl compound and a second dicarbonyl compound are contained that preferably comprise terephthalic acid and isophthalic acid. A filler having a hardness of 2.5 to 6 is comprised in the film, preferably barium sulfate.

Description

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