| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high-molecular-weight polyamide resin having a highly uniform degree of polymerization by continuously subjecting the powder of a low- polymerization-degree polymer of a crystalline terpolymer polymide to solid-state polyamerization under specified temperature conditions. SOLUTION: A powder of a low-polymerization-degree polymer having a mean particle diameter of 0.1-1mm and a relative viscosity of 0.8-2.0 and made of a crystalline terpolymer polyamide comprising 20-80wt.% equimolar salt of hexamethylenediamine with adipic acid, 20-80wt.% equimolar salt of hexamethylenediamine with terephthalic acid and 1-30wt.% 12-aminododecanoic acid orω-laurolactam is continuously fed into a polymerizer through a feed port. The powder is brought into a semi-fluidized state as a result of the vibration of the polymerization bed produced by a vibration motor, jumps and advances, and subjected to solid state polymerization under temperature conditions including the relationship: Tm -150 deg.C<=T<Tm (wherein Tm is the melting point of the polymer fed into the solid state polymerizer) and realized by contact with a heated inert gas (e.g. nitrogen gas) sent from the bottom of the polymerization bed through punched holes. After the lapse of a definite time, the product is discharged from the system to obtain a high- molecular-weight polyamide having a uniform degree of polymerzation.
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