| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyamide resin, a polyamide resin composition and a molded product using them, excellent in crystallinity, toughness and internal- cracking resistance. SOLUTION: The polyamide resin is composed of a diamine component unit (I) and a dicarboxylic acid unit (II). The diamine unit component (I) is composed of 1,9-diaminononane; a mol% and a 6-16C paraffinic diamine; b mol% having a straight chain and/or a side chain, excepting 1,9-diaminononane, wherein a mol% is 50-99 mol% and a+b=100 mol%. The carboxylic acid unit (II) is composed of terephthalic acid; c mol% and an aromatic dicarboxylic acid and/or a 4-20C paraffinic dicarboxylic acid; d mol%, wherein c+d=100 mol%. A difference in a and c is 15 mol% or below and the difference in b and d is 15 mol% or below.
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