Teijin Limited

Keiichi Moriyama

Shoji Kawase

Takeo Shima

A process for preparing a fired-retardant polyamide, which comprises polymerizing a carboxylic acid component consisting essentially of at least one naphthalene-dicarboxylic acid selected from the group consisting of naphthalene-2,7-dicarboxylic acid and naphthalene-2,6-dicarboxylic acid and/or its amide-forming derivative, and a halogen substituted-carboxylic acid and/or its amide-forming derivative, and an aliphatic diamine, the amount of said naphthalene dicarboxylic acid and/or its derivative being at least 40 mol% of the total acid component, and the amount of said halogen-substituted carboxylic acid being such that the halogen atom content of the polyamide is at least 0.13% by weight.

Fire-retardant polyamides from naphthalene dicarboxylic reactant and

Fiber-forming polyamides are prepared by poly-condensing naphthalene-2,7-dicarboxylic acid and a straight-chain aliphatic diamine containing 4 to 13 carbon atoms and 15 to 50 mol% of another carboxylic acid and/or another diamine as a copolymerizing component.

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Iwakuni, Japan

Keiichi Moriyama