| 摘要 |
COPOLYMERIZED POLYAMIDE AND A PRODUCTION PROCESS THEREOF Background of the Invention The present invention relates to a copolymerized polyamide and a production process thereof. Particularly it relates to a high quality copolymerized polyamide excellent in moldability, heat resistance, chemicals resistance, etc. and a production process thereof. Polyamides are widely used in the automobile industry and the electric and electronic industry as engineering plastics because of their excellent properties. Conventionally used polyamides are mainly nylon 6 and nylon 66. In recent years, automobile engines become higher in output and automobile engine rooms are packed more densely, to raise the atmosphere temperature, while the microelectronics industry has progressed to achieve smaller sizes and higher integration. In this situation, very thinly molded products which can withstand the use in a high temperature atmosphere are being demanded. However, nylon 6 and nylon 66 are respectively 220.degree.C and 260.degree.C in melting point (Tm), and even if they are reinforced by glass fibers, their critical heat distortion temperatures are the respective melting points. Recently, as polyamide resin compositions which can withstand the use in a high temperature atmosphere, many compositions such as terephthalic acid-containing polyamide resins and their compositions, and their glass fiber-reinforced compositions were proposed (JP59-161428A, JP59-155426A,
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