| abstract |
A copolymerized polyamide, comprising amide bonds formed by an aliphatic diamine with 4 to 14 carbon atoms and terephthalic acid, with the existence ratios of distributed respectively adjacent amide bonds satisfying the following formulae (A) and (B), and with the half-crystallization time satisfying the following formula (C).0.9</=[XY]obs./[XY]calcd.<1.1(A)0.9</=[XX]obs./[XX]calcd.<1.1(B)wherein X stands for an amide bond formed by an aliphatic diamine with 4 to 14 carbon atoms and terephthalic acid, and Y stands for any other amide bond than X. [XY] refers to the rate at which X and Y are adjacent to each other among all the amide bonds in the polymer structure, and [XX] refers to the rate at which X and X are adjacent to each other among all the amide bonds in the polymer structure. [XY] calcd. and [XX] calcd. are respectively the values of [XY] and [XX] calculated on the assumption that X and Y amide bonds are distributed statistically at random, and [XY] obs. and [XX] obs. are respectively the values of [XY] and [XX] measured from said copolymerized polyamide.4.4-0.1(Tm-T)</=log t+E,fra 1/2+EE <5.5-0.1 (Tm-T)(C)t+E,fra 1/2+EE is the half-crystallization time (seconds). Tm is the melting point ( DEG C.) of the copolymerized polyamide. T is the measuring temperature ( DEG C.) of the half-crystallization time. |