| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polyamide resin having a small density change after heat treatment as compared with those of conventional aliphatic polyamide resins, without damaging a low water absorptivity, chemical resistance and hydrolysis resistance observed in the aliphatic linear polyoxamide resin. <P>SOLUTION: The polyamide resin for an automobile component or an electric/electronic component having the small change in density by the heat treatment, consisting of oxalic acid as a dicarboxylic acid component and an aliphatic diamine as a diamine component is characterized by having 0.0 to +0.3% density change after the 48 hr treatment at a temperature higher than a glass transition temperature, obtained by a solid viscoelasticity measurement. <P>COPYRIGHT: (C)2012,JPO&INPIT |
