POLYAMIDE RESIN COMPOSITION AND PROCESS FOR THE PREPARATION THEREOF

摘要

A polyamide resin composition comprising a polyamide resin and fibrous xonotlite, characterized in that the xonotlite content is 1 wt.% or above but below 10 wt.%, that the xonotlite has a BET specific surface area of 21 m<2>/g or above as determined by the nitrogen adsorption method and a specific shape, and preferably that the crystallinity of the polyamide resin is 0.40 or above as represented by the formula: DELTA Hm/{ DELTA H0(1-Wf)} wherein DELTA Hm is the heat of fusion of the polyamide resin composition as found under specific conditions; Wf is the weight fraction of the fibrous xonotlite in the composition; and DELTA H0 is the heat of fusion of crystal of the polyamide resin. Moldings of the composition exhibit excellent physical properties by virtue of the speedy crystallization and excellent moldability of the composition and the high crystallinity of the polyamide resin, thus being widely usable as automobile materials, electrical and electronic components, parts of precision machines, wrapping materials and so on.