Patent ID: 6693163
Filing Date: 2004-02-17
Classification: C08G

Abstract:
A method for solid-phase drying or solid-phase polymerizing a polyamide that comprises a diamine component containing 70 mol % or more of xylylene diamine and a dicarboxylic acid component containing 70 mol % or more of adipic acid, the method comprising solid-phase drying or solid-phase polymerizing the polyamide that is stored for 20 days or longer after the production thereof until subjected to the solid-phase drying or the solid-phase polymerization under conditions satisfying the following Formula A:0.8Ã—10âˆ’9&gE;PÃ—D0.5Ã—exp{âˆ’6002/T+(1âˆ’2Ã—C/100)Ã—(aÃ—(h/100âˆ’0.6)2+0.62)}â€ƒâ€ƒ(A) wherein P is an oxygen partial pressure (MPa) of an atmosphere to which the polyamide is exposed; h is relative humidity (%RH) of the atmosphere to which the polyamide is exposed; D is a storage time (days); T is a temperature (K) of the atmosphere to which the polyamide is exposed; C is a crystallization degree (%) of the polyamide; a is a numerical value of 2.9 when h is less than 60%RH or 18.8 when h is 60%RH or higher,at a temperature lower than a glass transition temperature of the polyamide while shielding against light.