Unitika Ltd.

Munenori Yamada

Akira Shigeta

Makoto Nakai

Yumeto Fukubayashi

The present invention is to provide a polyamide-imide which has a high regularity of molecular structure and few branched structures, does not contain hydrogen halide, is not required to be separated and purified in post processes, and can be suitably used as a film, a varnish, or a molding material; raw material salt of polyamide-imide and production method thereof. The polyamide-imide has a repeating unit represented by the general formula (1): in which R, Rrepresent independently a divalent residue having an aromatic ring, an aliphatic ring or an aliphatic hydrocarbon; R, Rrepresent independently a trivalent residue having an aromatic ring or an aliphatic ring; and an hydrogen atom bonding to the respective rings may be replaced by another atom or an atomic group.

Polyamide-imide, raw material salt of polyamide-imide, and production method thereof

An object of the present invention is to provide an industrially advantageous method for producing a bisimide dicarboxylic acid, which uses substantially no solvent and requires no granulation after completion of the reaction. The above object can be achieved by a method for producing a bisimide dicarboxylic acid with a tricarboxylic acid anhydride and a diamine, including the following processes (i) and (ii):

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Uji, Japan

Munenori Yamada