TRANSPARENT POLYAMIDE-IMIDE RESIN AND FILM USING SAME

摘要

Disclosed are a transparent polyamide-imide resin and a film using the same, which can be colorless and transparent, can show excellent thermal stability and mechanical properties, and can have low birefringence, making it possible to serve in various fields including a semiconductor insulator, a TFT-LCD insulator, a passivation layer, a liquid crystal alignment layer, materials for optical communication, a protective film for a solar cell, a flexible display substrate and the like.

主权项

1. A polyamide-imide resin, which is an imide of a polyamic acid resulting from copolymerizing an aromatic dianhydride and an aromatic dicarbonyl compound with an aromatic diamine, wherein the aromatic dicarbonyl compound is contained in an amount of 1 to 50 mol % based on a total molar amount of the aromatic dianhydride and the aromatic dicarbonyl compound, the aromatic dianhydride includes (i) 4,4′-hexafluoroisopropylidene diphthalic anhydride (6FDA) and (ii) at least one selected from among cyclobutanetetracarboxylic dianhydride (CBDA) and cyclopentanetetracarboxylic dianhydride (CPDA), and the aromatic diamine includes 2,2′-bis(trifluoromethyl)-1,1′-biphenyl-4,4′-diamine (TFDB).