Patent ID: 6303741
Filing Date: 2001-10-16
Classification: C08G

Abstract:
A solid phase-polymerized polyamide which is produced by solid phase polymerization of a melt-polymerized polyamide obtained by polycondensing in molten state a diamine component containing not less than 80 mol % of m-xylylenediamine with a dicarboxylic acid component containing not less than 80 mol % of adipic acid, said melt-polymerized polyamide satisfying the following formulae (A) and (B):1.83.ltoreq.a.ltoreq.2.28 (A)8 .mu.eq/g.ltoreq.b.ltoreq.82 .mu.eq/g (B)wherein ""a"" is a relative viscosity measured at 25.degree. C. on a solution of 1 g of said melt-polymerized polyamide in 100 cc of 96% sulfuric acid and ""b"" is [COOH]-[NH.sub.2 ] wherein [COOH] is a concentration (.mu.eq/g) of end carboxyl groups and [NH.sub.2 ] is a concentration (.mu.eq/g) of end amino groups; and said solid phase-polymerized polyamide satisfying the following formulae (C) and (D):16500.ltoreq.16200.times.d-c.ltoreq.20000 (C)2.30.ltoreq.d.ltoreq.4.20 (D)wherein ""d"" is a relative viscosity measured at 25.degree. C. on a solution of 1 g of said solid phase-polymerized polyamide in 100 cc of 96% sulfuric acid and ""c"" is a number average molecular weight calculated from 2.times.10.sup.6 /([COOH]+[NH.sub.2 ]).