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COPOLYAMIDE BASED ON TETRAMETHYLENE TEREPHTHALAMIDE AND HEXAMETHYLENE TEREPHTHALAMIDE
COPOLYAMIDE BASED ON TETRAMETHYLENE TEREPHTHALAMIDE AND HEXAMETHYLENE TEREPHTHALAMIDE
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机译:基于四亚甲基对苯二甲酸乙酰胺和六亚甲基对苯二甲酸乙二酰胺的共聚酰胺
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摘要
The invention relates to a semi-aromatic polyamide containing at least tetramethylene terephthalamide units and also hexamethylene terephthalamide units. The copolyamide has a melting point higher than approximately 290° C., a high crystallinity and a good stability. Preferably the copolyamide according to the invention contains approximately 30-75 mol % hexamethylene terephthalamide units and also approximately 0.01-20 mol % other units. The invention also relates to a process for the preparation of a semi-aromatic copolyamide containing at least tetramethylene terephthalamide units and hexamethylene terephthalamide units, characterised in that, successively, a first polymerization is effected in the melt phase, followed by an post-polymerization of the low molar mass polymer thus obtained in the solid phase; and to compositions and products that contain said copolyamide.
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