| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a multilayer structure being a laminate of polyamide composition which has a superior gas barrier ability and a good color and also allows many hours of continuous operation in the molding process. <P>SOLUTION: The multilayer structure is composed at least 2 layers. Layer 1 is mainly composed of a thermoplastic resin. Layer 2 is composed mainly of a polyamide resin composition which is a mixture of polyamide X prepared by melt-polycondensing a diamine component containing≥70 mol.% of metaxylylenediamine and a dicarboxylic acid component containing≥70 mol.% of anα,ω-straight chain aliphatic dicarboxylic acid in the presence of phosphorus atom-containing compound A and degradation-inhibiting compound B. The phosphorus atom-containing compound A is added to the melt-polycondensation system so that the content of the phosphorus atom in the polyamide X reaches 50-400 ppm. The value obtained by dividing the molar number of the degradation-inhibiting compound B by the molar number of the phosphorus atom-containing compound A added to the melt-polycondensation system is 0.05-0.5. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
