Processes of preparing condensed polymers with...

C - Chemistry – Metallurgy – 08 – G

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C08G 69/04 (2006.01) C08G 69/32 (2006.01) C08G 73/10 (2006.01) C08G 73/14 (2006.01)

Patent

CA 2365582

This invention provides processes of the preparation of polyamides , polyimides , and polyamideimides , which are easy to purify after reactions, from polycarboxylic acids and polyamines in high yield without side reactions such as a change of color to black by direct polycondensation reaction with heat, especially processes of preparing aromatic polyamides (aramids), aromatic polyimides, and aromatic polyamideimides, which are difficult to synthesize in direct polycondensation reaction. Polyamides, polymides, and polyamideimides are prepared in high yield by the polycondensation of aromatic dicarboxylic acids, aromatic tetracarboxylic acids or aromatic tricarboxylic acids and aromatic diamines, using arylboric acids such as 3,4,5-trifluorophenylboric acids as polycondensation catalysts, in a mixed solvent of pentamethylbenzene and N-methylpyrrolidinone or a mixed solvent of m-terphenyl and N-butylpyrrolidinone.

La présente invention concerne un procédé dans lequel un polyamide, un polyimide, ou un polyamide-imide, qui peuvent être facilement purifiés après réaction, particulièrement un polyamide aromatique (aramide), un polyimide aromatique, ou un polyamide-imide aromatique, difficiles à synthétiser par polycondensation directe, sont produits, avec un rendement élevé, par polycondensation directe d'un acide polycarboxylique et d'une polyamine, avec chauffage, tout en inhibant des réactions secondaires, par exemple, une réaction accompagnée d'un changement de couleur passant au noir. Un acide dicarboxylique, un acide tétracarboxylique aromatique, ou un acide tricarboxylique aromatique sont polymérisés par condensation avec une diamine aromatique à l'aide d'acide arylborique, c'est à dire, d'acide 3,4,5-trifluorophénylborique, comme catalyseur de polycondensation en présence d'un mélange de solvant comprenant du pentaméthylbenzène et de la N-méthylpyrrolidone, ou du m-terphényle et de la N-méthylpyrrolidone, afin d'obtenir un polyamide, un polyimide, ou un polyamide-imide avec des rendements élevés.

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