SEMIAROMATIC POLYAMIDE, SEMIAROMATIC POLYAMIDE RESIN COMPOSITION, AND MOLDED ARTICLE

摘要

To provide: a semiaromatic polyamide which has excellent moldability, heat resistance, chemical resistance and mechanical characteristics; and a molded article of this semiaromatic polyamide. A semiaromatic polyamide (I) of the present invention contains 35-50% by mole of a structural unit derived from terephthalic acid [A], 25-40% by mole of a structural unit derived from isophthalic acid [B], 15-35% by mole of a structural unit derived from an aliphatic dicarboxylic acid [C] (provided that the total of [A], [B] and [C] is 100% by mole), and a structural unit derived from an aliphatic diamine [D] having 4-12 carbon atoms. The molar ratio ([A]/[B]) is from 65/35 to 50/50, and the molar ratio ([C]/[B]) is from 30/70 to 50/50. The melting enthalpy ([increment]H) of the semiaromatic polyamide (I) as determined by differential scanning calorimetry (DSC) is 20-40 mJ/mg, and the intrinsic viscosity of the semiaromatic polyamide (I) is 0.7-1.6 dl/g.

主权项

1. A semi-aromatic polyamide (I) comprising:
a structural unit derived from terephthalic acid [A]; a structural unit derived from isophthalic acid [B]; a structural unit derived from C4-10 aliphatic dicarboxylic acid [C]; and a structural unit derived from C4-12 aliphatic diamine [D]; wherein: the semi-aromatic polyamide (I) comprises 35 to 50 mol % of the structural unit derived from terephthalic acid [A], 25 to 40 mol % of the structural unit derived from isophthalic acid [B], and 15 to 35 mol % of the structural unit derived from aliphatic dicarboxylic acid [C] provided that a sum of [A], [B] and [C] is 100 mol %; a molar ratio of the structural unit derived from terephthalic acid [A] to the structural unit derived from isophthalic acid [B] ([A]/[B]) is 65/35 to 50/50 and a molar ratio of the structural unit derived from aliphatic dicarboxylic acid [C] to the structural unit derived from isophthalic acid [B] ([C]/[B]) is 30/70 to 50/50; and an amount of melting heat (AH) of the semi-aromatic polyamide (I) obtained by differential scanning calorimetry (DSC) is 20 to 40 mJ/mg and an intrinsic viscosity [η] of the semi-aromatic polyamide (I) is 0.7 to 1.6 dl/g.