| abstract |
(57) [Summary] (Modified) [PROBLEMS] Particularly good resistance to engine cooling water obtained by diluting an antifreeze containing ethylene glycol as a main component with water, as well as heat resistance, molded product surface appearance, dimensional stability, and many others. Provided are an engine cooling water system component for an automobile by multicolor molding, in which the adhesion of the molded product at the time of color molding is balanced and excellent, and an efficient production method thereof. (I) A polyamide resin having nylon 66 as a main component is used as a primary material, and (II) (A) (a) nylon 6 6, at least one polyamide resin 9 selected from nylon 6 and copolymerized polyamides containing these as a main component (B) glass fiber having an average fiber diameter of 5 to 15 μm with respect to 100 parts by weight of a mixture of 8 to 50% by weight and (b) 2 to 50% by weight of a polyamide resin other than the component (a). A composition containing 150 parts by weight and (C) 0.01 to 2 parts by weight of a copper compound is used as a secondary material, and the secondary material is injection-molded at a joint of a primary molded product. |