abstract |
PROBLEM TO BE SOLVED: To stably provide a polyamide composition excellent in mechanical properties, particularly rigidity and surface appearance when absorbing water. A semi-aromatic polyamide containing a dicarboxylic acid unit containing at least 75 mol% of isophthalic acid and a diamine unit composed of a chain aliphatic diamine having 4 to 10 carbon atoms and having a tan δ peak temperature of 90°C. It is above, and weight average molecular weight Mw is 10000<=Mw<35000, The semi-aromatic polyamide characterized by the above-mentioned. [Selection diagram] None |