Semiaromatic polyamides, processes for preparing the same...

C - Chemistry – Metallurgy – 08 – G

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C08G 69/26 (2006.01) C08G 69/36 (2006.01) C08K 3/22 (2006.01) C08K 5/03 (2006.01) C08K 5/136 (2006.01) C08K 7/02 (2006.01) C08L 77/06 (2006.01)

Patent

CA 2208840

The semiaromatic polyamide of the invention comprises 40 to 90 % by mol of (A) recurring units derived from terephthalic acid and an aliphatic diamine of 4 to 12 carbon atoms, 0 to 50 % by mol of (B) recurring units derived from isophthalic acid and an aliphatic diamine of 4 to 12 carbon atoms,0 to 60 % by mol of (C) recurring units derived from an aliphatic dicarboxylic acid of 4 to 18 carbon atoms and an aliphatic diamine of 4 to 12 carbon atoms and 0 to 50 % by mol of (D) recurring units derived from a lactam or an aminocarboxylic acid of 6 to 20 carbon atoms, and has a content of boiling water-soluble components (MO components) of not more than 0.25 % by weight. The semiaromatic polyamide has a low content of the MO components, so that mold contamination hardly brought about in the molding process, and also molded articles of good heat resistance can be produced.

Cette invention concerne un polyamide semi-aromatique comprenant les éléments suivants: (A) de 40 à 90 % en mole d'unités récurrentes dérivées d'acide téré-phthalique et d'une diamine C4-12 aliphatique; (B) de 0 à 50 % en mole d'unités récurrentes dérivées d'acide isophthalique et d'une diamine C4-12 aliphatique; (C) de 0 à 60 % en mole d'unités récurrentes dérivées d'acide dicarboxylique C4-18 aliphatique et d'une diamine C4-12 aliphatique; et (D) de 0 à 50 % en mole d'unités récurrentes dérivées d'un lactame C2-60 ou d'un acide carboxylique aminé. Ce polyamide semi-aromatique ne contient pas plus de 0,25 % en poids de composants solubles dans de l'eau en ébullition (composants MO). Etant donné la teneur réduite en composants MO, le polyamide semi-aromatique ainsi obtenu n'entraîne qu'une maculation très réduite des moules lors du procédé de moulage, et permet d'obtenir des articles moulés ayant d'excellentes qualités de résistance thermique.

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