| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyamide resin composition which has low water absorbability, is excellent in dimensional stability and chemical resistance, is also excellent in molding processabilities such as moldability and weldability, and is suitable for an engine cooling water system component. <P>SOLUTION: The polyamide resin composition for an engine cooling water system component is a resin composition which contains 30-150 pts.mass of an inorganic filler (D) with respect to 100 pts.mass of a copolyamide resin (A) composed of 50-98 mol% of a decane terephthalamide unit (a) and 50-2 mol% of an undecane amide unit or/and a dodecane amide unit (b), wherein a tensile test piece (conforming to ASTM D638, No.1 test piece) obtained by injection molding of the resin composition satisfies following (α) and (β). (α): Tensile strength T<SB POS="POST">1</SB>after being immersed in an antifreeze liquid (LLC) for 24 hours at 130°C is at least 80 MPa. (β): Tensile strength T<SB POS="POST">2</SB>after being immersed in the antifreeze liquid (LLC) for 1,000 hours at 130°C is 80% or more of T<SB POS="POST">1</SB>. <P>COPYRIGHT: (C)2012,JPO&INPIT |
