| 摘要 |
PROBLEM TO BE SOLVED: To provide an additive for injection molding with which dimensional precision is improved and even a small-sized article of intricate shape is produced by injection molding. SOLUTION: This additive for injection molding contains 25-45wt.% ethylene- vinyl acetate copolymer, 20-40wt.% polymethacrylic acid and 10-15wt.% paraffin wax. The additive is mixed in a raw material when a mask material for a floppy head, etc., are injection-molded. In this case, 17-22g of the additive is mixed in 100g of raw powder. |
