long glass fiber reinforced polypropylene mixture, and polypropylenharz and resulting molded parts

摘要

A mixture for melt process moldings, and a molding formed of the mixture. The mixture consists essentially of about 5 to about 70 wt% of a master batch prepared in the form of pellets formed by cutting a long glass fiber reinforced polypropylene resin, and about 30 to about 95 wt% of polypropylene resin. The long glass fiber reinforced polypropylene resin is prepared in such a manner that a bundle of continuous reinforcement glass fibers surface-finished with a finishing agent containing a coupling agent is impregnated with a modified polypropylene resin having a functional group capable of chemically bonding with the coupling agent and having a melt flow rate of about 70 to about 300 g/10 min (ASTM D-1238, load: 2.16 kg, temperature: 230 DEG C) while the bundle of glass fibers is being drawn. The pellets have a length of about 2 to about 50 mm in the direction along the fibers. The glass fibers in the pellets extend uniformly in parallel with each other through a distance substantially equal to the length of the pellets. The pellets have a glass fiber content of about 60 to about 90 wt%.