| 摘要 |
PURPOSE:To prevent the warpage of a molded article composed of a crystalline polyamide and a fibrous reinforcing material, without lowering the heat- resistance, rigidity and impact strength of the molded article, by adding a specific amount of a specific amorphous copolymerized polyamide to the resin composition. CONSTITUTION:A molded article free from warpage is produced by mixing (A) a crystalline polyamide (e.g. nylon 6 or nylon 46) with (B) a fibrous reinforcing material having an aspect ratio of preferably >=5 (e.g. glass fiber) and (C) 3-40wt.% of an amorphous copolymerized polyamide derived from 50-10mol% of isophthalic acid, 0-40mol% of terephthalic acid, 45-5mol% of hexamethylenediamine and 5-45mol% of bis(4-amino-3-methylcyclohexyl)methane and preferably having a glass transition temperature of >=100 deg.C and a relative viscosity of 1.2-3, thoroughly mixing the components with a twin-screw extruder, etc., under melting and molding the obtained resin composition. |
