Polyamide Production Method

摘要

The polyamide production method of the present invention comprises the steps of: producing a low-order condensate by effecting a polycondensation reaction between a dicarboxylic acid component containing between about 5 and about 40 mol. % of terephthalic acid, and a diamine component containing between about 70 and about 100 mol. % of a xylylenediamine in which the content of paraxylylenediamine is between about 50 and about 100 mol. %, under conditions of a reaction temperature of at least about 200° C. and less than about 230° C.; discharging and cooling the low-order condensate at a pressure at or below atmospheric pressure, in an inert gas atmosphere; and subjecting the discharged and cooled low-order condensate to solid state polymerization. The production method makes it possible to obtain a polyamide having outstanding mechanical strength, heat resistance, colour tone and the like without problems such as gelling.

主权项

1. A polyamide production method comprising:
preparing a low-order condensate through polycondensation of a dicarboxylic acid component containing about 5 mol % to about 40 mol % of terephthalic acid and a diamine component containing about 50 mol % to about 100 mol % of p-xylylenediamine and about 70 mol % to about 100 mol % of xylylenediamine at a reaction temperature of about 200° C. to less than about 230° C.; discharging and cooling the low-order condensate at atmospheric pressure or less under an inert gas atmosphere; and solid-polymerizing the discharged and cooled low-order condensate.