| 摘要 |
PURPOSE: To obtain a resin composition which easily and accurately gives molding die parts through machining without requiring a master model by compounding a thermosetting resin, an inorganic fibrous reinforcing material and an inorganic particulate filler so as to provide specified properties. CONSTITUTION: This composition consists of a themosetting resin (e.g. vinyl ester resin) preferably in an amount of 25-70wt.%, an inorganic fibrous reinforcing material (e.g. potassium titanate whisker) preferably having a mean fiber diameter of at most 5μm, an aspect ratio of at least 3 and a Mohs hardness of at most 6, preferably in an amount of 15-50wt.%, and an inorganic particulate filler (e.g. calcium carbonate) preferably having a mean particle diameter of at most 20μm and a Mohs hardness of at most 6, preferably in an amount of 10-50wt.%, and it has a flexural strength of at least 1,000kgf/cm<2> , a flexural modulus of at least 70,000kgf/cm<2> and machinable properties. The core 2 and cavity 1 of a molding die A are formed from the composition. |
