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AssigneeKaneka Corporation
InventorsKan Fujihara, Kazuhiro Ono, Kiyokazu Akahori
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In a step of polymerizing polyamic acid by mixing tetracarboxylic acid dianhydride and diamine and polycondensating the tetracarboxylic acid dianhydride and diamine under the presence of a polymerization-use solvent, a tetracarboxylic acid dianhydride slurry in which a tetracarboxylic acid dianhydride is dispersed in a dispersion medium is used. According to this, it is possible to directly manufacture a polyamic acid solution having a high concentration of polyamic acid more than or equal to 10% by weight. Especially, even if a tetracarboxylic acid dianhydride having low solubility in the polymerization-use solvent, it is possible to effectively manufacture a polyamic acid solution having high solids content, by a simple process and in a short time.
A manufacturing method of polyamic acid, comprising the step of:
A polyamic acid solution containing polyamic acid manufactured by a manufacturing method comprising the step of:
A polyamic acid solution containing polyamic acid of 10% by weight, the polyamide being directly manufactured by a manufacturing method comprising the step of:
Dependencies are inferred from the claim text.