| 摘要 |
PURPOSE:To improve the electrical insulating properties of the subject film by forming a film from poly-p-phenylene sulfide resin pellets contg. inert fine particles having a mean value and a relative standard deviation of the equivalent diameter of equal-area circle as calculated by a specific equation and a specified particle diameter ratio. CONSTITUTION:Inert fine particles, e.g. vaterite CaCO3, are dispersed in a liq. boiling at 180-290 deg.C, e.g. ethylene glycol, to give a slurry contg. the particles having a particle diameter ratio of 1.0-2.5, a relative standard deviation of the equivalent diameter of equal-area circle as calculated by equation I [wherein Di is an equivalent diameter (mum) of equal-area circle of particles; D is a mean value (mum) of the equivalent diameter calculated by equation II; and (n) is the number of particles] of 1.0 or lower, and a mean value of the equivalent diameter of 0.05-3.0mum. The slurry is mixed with a poly-p-phenylene sulfide powder and extruded on a vented extruder to give pellets contg. 0.01-2wt.% the particles, which are extruded into a film and biaxially oriented, thus giving the objective film. |
