| 摘要 |
PROBLEM TO BE SOLVED: To obtain an excellent product at low cost by a method wherein a carboxylic acid, a dicarboxylic acid or their anhydrides, the rate of each of which to a polypropylene is specified and a specified rate of an organic peroxide to the polypropylene are fed through a main supplying port, while glass fiber chopped strands are fed through a second supplying port. SOLUTION: A two stage type twin-screw extruder is used. The ratio of a polypropylene and modified polypropylene mixture fed to a first stage and a glass fiber fed to a second stage is selected arbitrarily. As a carboxylic acid, a dicarboxylic acid or their adhydrides used for modification, normally a maleic acid anhydride is used. The loadings of an organic peroxide is set to be 0.01-0.2 pts. to 100 pts. of polypropylene. In addition, the glass fibers are fed in the shape of chopped strands. As a carboxylic anhydride, 0.05-1.0wt.% of which is added to polypropylene. As a result, a glass fiber reinforced polypropylene excellent in physical properties can be manufactured and that excellent in cost can be realized. |
