GLASS FIBER-REINFORCED POLYPROPYLENE RESIN COMPOSITION AND PREPARATION OF MOLDED PRODUCT USING THE SAME
PROBLEM TO BE SOLVED: To obtain a molded product containing glass fibers well dispersed therein, excellent in mechanical strength and impact strength and stabilized in qualities by mixing a polypropylenic resin in the shape of a mini-pellet with glass fibers having a specific diameter and a specific...
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| creator | TSUTSUMI IKUO SAKAIZAWA MASAO MATSUOKA KENJI |
| description | PROBLEM TO BE SOLVED: To obtain a molded product containing glass fibers well dispersed therein, excellent in mechanical strength and impact strength and stabilized in qualities by mixing a polypropylenic resin in the shape of a mini-pellet with glass fibers having a specific diameter and a specific length and directly injection-molding it without melt-kneading. SOLUTION: With 100 pts.wt. of a polypropylene resin having an MFR of 30-300 g/10 min and the shape of a mini-pellet having a diameter of 0.4-1.5 mm and a length of 0.5-15 mm are admixed 5-100 pts.wt. of a glass fiber having a diameter of 8-20 μm and a length of 2-15 mm to give a glass fiber-reinforced polypropylene resin composition for direct injection molding. Desirably, the ratio of the length Lp of the mini-pellet to the length of the glass fiber Lf (Lp/Lf) is 1/10 to 2. Combination of the polypropylene resin with 0.01-10 pts.wt., based on 100 pts.wt. of the glass fiber, of a polypropylene resin modified with an unsaturated carboxylic acid or a derivative thereof further improves the mechanical strength. This composition is subjected to a direct injection molding to give a molded product. |
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SOLUTION: With 100 pts.wt. of a polypropylene resin having an MFR of 30-300 g/10 min and the shape of a mini-pellet having a diameter of 0.4-1.5 mm and a length of 0.5-15 mm are admixed 5-100 pts.wt. of a glass fiber having a diameter of 8-20 μm and a length of 2-15 mm to give a glass fiber-reinforced polypropylene resin composition for direct injection molding. Desirably, the ratio of the length Lp of the mini-pellet to the length of the glass fiber Lf (Lp/Lf) is 1/10 to 2. Combination of the polypropylene resin with 0.01-10 pts.wt., based on 100 pts.wt. of the glass fiber, of a polypropylene resin modified with an unsaturated carboxylic acid or a derivative thereof further improves the mechanical strength. 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SOLUTION: With 100 pts.wt. of a polypropylene resin having an MFR of 30-300 g/10 min and the shape of a mini-pellet having a diameter of 0.4-1.5 mm and a length of 0.5-15 mm are admixed 5-100 pts.wt. of a glass fiber having a diameter of 8-20 μm and a length of 2-15 mm to give a glass fiber-reinforced polypropylene resin composition for direct injection molding. Desirably, the ratio of the length Lp of the mini-pellet to the length of the glass fiber Lf (Lp/Lf) is 1/10 to 2. Combination of the polypropylene resin with 0.01-10 pts.wt., based on 100 pts.wt. of the glass fiber, of a polypropylene resin modified with an unsaturated carboxylic acid or a derivative thereof further improves the mechanical strength. 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| subjects | AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL |
| title | GLASS FIBER-REINFORCED POLYPROPYLENE RESIN COMPOSITION AND PREPARATION OF MOLDED PRODUCT USING THE SAME |
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