| 摘要 |
An abrasive sheet having an excellent flexibility, mechanical strength and heat resistance comprises an aromatic imide polymer matrix and abrasive particles having an average size of 0.1 to 50 mu m and is prepared by evenly dispersing the abrasive particles in an organic polar solvent, mixing the resultant dispersion with a polymerization mixture consisting of an acid component comprising, as a major acid ingredient, a biphenyltetracarboxylic acid or an dianhydride thereof with a diamine component comprising an aromatic diamine, while polymerizing the acid and diamine components at 0 DEG C. to 80 DEG C. into an aromatic polyamic acid, forming the resultant dope dispersion into a thin layer and solidifying the thin layer while imidizing the aromatic polyamic acid into a corresponding aromatic imide polymer.
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