Abstract: A polyamide resin pellet for a miniature part, comprising a polyamide resin (A) whose melting point as measured by DSC is in the range of 280 to below 330° C., which has an average volume of 0.001 to 21 mm3, the average volume determined by randomly sampling 50 pellets, measuring the weight and specific gravity of each of the pellets and dividing the weight by the specific gravity. The polyamide resin pellet exhibits low water absorption and is excellent in moldability, mechanical strength characteristics and heat resistance. Further, it has specified average volume, configuration, average diameter and average length, so that, in an injection molding, plasticization is smoothly effected to thereby enable obtaining a molded item or article which exhibits low dispersion of weight and strength and has excellent hue. The polyamide resin pellet is especially suitable for use in a molding material for forming miniature parts for motor vehicles and electrical or electronic equipments.

Abstract: A polyamide resin pellet for a miniature part, comprising a polyamide resin (A) whose melting point as measured by DSC is in the range of 280 to below 330° C., which has an average volume of 0.001 to 21 mm3, the average volume determined by randomly sampling 50 pellets, measuring the weight and specific gravity of each of the pellets and dividing the weight by the specific gravity. The polyamide resin pellet exhibits low water absorption and is excellent in moldability, mechanical strength characteristics and heat resistance. Further, it has specified average volume, configuration, average diameter and average length, so that, in an injection molding, plasticization is smoothly effected to thereby enable obtaining a molded item or article which exhibits low dispersion of weight and strength and has excellent hue. The polyamide resin pellet is especially suitable for use in a molding material for forming miniature parts for motor vehicles and electrical or electronic equipments.

Abstract: A process for injection compression molding ultra high molecular weight polyethylene having an intrinsic viscosity of 3 dl/g or higher measured at 135.degree. C. in decalin and a melt index of 0.01 g/10 min or less comprises,(a) heating the ultra high molecular weight polyethylene to 170.degree.-240.degree. C.,(b) adjusting the volume of the mold cavity V.sub.1 equal to the volume of the molded article V.sub.0,(c) injecting ultra high molecular weight polyethylene having a volume V.sub.0 into the mold cavity through a runner portion at a shear rate of at least 20,000 sec.sup.-1,(d) instantaneously expanding the mold cavity to adjust its volume V.sub.1 to satisfy the relation:1.2 V.sub.0 .ltoreq.V.sub.1at a time from T.sub.1 (immediately before completion of injection) and a time T.sub.