| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyamide composition which can give a molding having excellent heat resistance, water absorption characteristics, and chemical resistance by blending two polyamides in a specified ratio. SOLUTION: This composition is obtained by blending polyamide A with polyamide B in a weight ratio satisfying the relationships: B/(A+B)×100>=10. Polyamide A comprises units selected from the group consisting of hexamethylene terephthalamide units (a), hexamethylene isophthalamide units (b), hexamethylene adipamide units (c), and capramide units (d) on conditions that any of the following relationships is satisfied: a/b=55/45 to 80/20, a/c=20/80 to 80/20, and a/d=55/45 to 90/10. Polyamide B comprises dicarboxylic acid units containing 60-100 mol% terephthalic acid units and diamine units containing 60-100 mol% 1,9-nonanediamine units and/or 2-methyl-1,8- octanediamine units in a molar ratio of the former units to the latter units of 100/0 to 20/80.
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