Transparent polyimide film and preparation method thereof
AssigneeKolon Industries, Inc.
InventorsChul Ha Ju, Hyo Jun Park, Hak Gee Jung
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Abstract
The present invention relates to a transparent polyimide film with improved tensile strength and a preparation method thereof, and more specifically to a colorless, transparent polyimide film having excellent optical properties and improved tear strength at the same time through the use of a monomer containing a functional group or an improver for improving tensile strength, and a preparation method thereof, wherein the functional group is selected from the group consisting of a hexafluoro group, a sulfone group, and an oxy group.
Claims9
A method of preparing a transparent polyimide film, comprising the steps of:
- copolymerizing an aromatic dianhydride and an aromatic diamine to obtain polyamic acid;
- and
- casting the polyamic acid on a support to imidize the polyamic acid,
- wherein the method further comprises the step of introducing an additive for improving tear strength before or after obtaining the polyamic acid, or
- the step of introducing a monomer including a functional group selected from the group consisting of a hexafluro group, a sulfone group and an oxy group before obtaining the polyamic acid.
A transparent polyimide film, comprising:
- a unit structure derived from an aromatic dianhydride and an aromatic diamine,
- wherein the transparent polyimide film further comprises an additive for improving tear strength, or
- a unit structure derived from a monomer including a functional group selected from the group consisting of a hexafluro group, a sulfone group and an oxy group.
Dependencies are inferred from the claim text.