Polyimide film for graphite sheet, and graphite sheet manufactured therefrom
AssigneePI Advanced Materials Co., Ltd.
InventorsWon Ho Son, Hyong Sop Jo
Life of this patent
Estimating the term…
Abstract
Disclosed herein are a polyimide film for graphite sheets and a graphite sheet manufactured using the same. The polyimide film is fabricated by imidizing a precursor composition including: a polyamic acid prepared by reacting a dianhydride monomer with a diamine monomer; and an organic solvent, wherein the diamine monomer includes about 30 mol % to about 70 mol % of 4,4′-methylenedianiline and about 30 mol % to about 70 mol % of 4,4′-oxydianiline based on the total number of moles of the diamine monomer, 4,4′-methylenedianiline and 4,4′-oxydianiline being present in total in an amount of about 85 mol % or more based on the total number of moles of the diamine monomer.
Claims4
A polyimide film for graphite sheets, the polyimide film being fabricated by imidizing a precursor composition comprising:
- a polyamic acid prepared by reacting a dianhydride monomer with a diamine monomer;
- and an organic solvent,
- wherein the diamine monomer comprises about 30 mol % to about 70 mol % of 4,4′-methylenedianiline and about 30 mol % to about 70 mol % of 4,4′-oxydianiline based on the total number of moles of the diamine monomer, 4,4′-methylenedianiline and 4,4′-oxydianiline being present in total in an amount of about 85 mol % or more based on the total number of moles of the diamine monomer,
- wherein the precursor composition comprises a sublimable inorganic filler,
- wherein the sublimable inorganic filler is dicalcium phosphate,
- wherein the sublimable inorganic filler is present in an amount of 0.2 parts by weight to 0.5 parts by weight relative to 100 parts by weight of the polyamic acid, and
- wherein an average particle diameter (D50) of the sublimable inorganic filler is 1.5 μm to 4.5 μm.
Dependencies are inferred from the claim text.