Patent ID: 11945775
Assignee: WANHUA CHEMICAL GROUP CO., LTD.
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 1:
2. The preparation method according to claim 1, wherein the dianhydride compound is one selected from the group consisting of pyromellitic dianhydride, benzophenonetetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride, tetracarboxydiphthalic ether dianhydride, hexafluorotetracarboxylic dianhydride, triphenylbiether tetracarboxylic dianhydride, 1,2,4,5-cyclohexenetetracarboxylic dianhydride, cyclobutanetetracarboxylic dianhydride, bisphenol A type diether tetracarboxylic dianhydride, naphthalene-1,4,5,8-tetracarboxylic dianhydride, 3,4,9,10-perylenetetracarboxylic dianhydride, 3,3′,4,4′-triphenylbiether tetracarboxylic dianhydride, 1,2,3,4-cyclopentanetetracarboxylic dianhydride, and a combination of more than two selected therefrom.