Patent ID: 11905372
Assignee: PI ADVANCED MATERIALS CO., LTD.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 0:
1. A polyimide film, including a block copolymer comprising:
a first block obtained by imidizing a dianhydride component consisting of 3,3′,4,4′-benzophenonetetracarboxylic dianhydride and 3,3′,4,4′-biphenyltetracarboxylic dianhydride with diamine component consisting p-phenylenediamine, and
a second block obtained by imidizing a dianhydride component consisting of pyromellitic dianhydride with a diamine component consisting of m-tolidine,
wherein the 3,3′,4,4′-benzophenonetetracarboxylic dianhydride is used at a content of 15% by mole to 35% by mole and the 3,3′,4,4′-biphenyltetracarboxylic dianhydride is used at a content of 35% by mole to 75% by mole, based on a total of 100% by mole of the dianhydride component in the first block and the second block,
wherein the m-tolidine is used at a content of 20% by mole to 40% by mole and the p-phenylenediamine is used at a content of 60% by mole to 80% by mole, based on a total of 100% by mole of the diamine component in the first block and the second block,
wherein a glass transition temperature (Tg) of 320° C. or higher, a moisture absorption rate measured by the ASTM D570 test method is 0.4 wt % or less, and a dielectric dissipation factor (Df) of 0.004 or less at a frequency of 10 GHz.