Process for produce a readily slidable film

A process for production of a readily slidable stretched syndiotactic polystyrene film comprising

• stretching and then restretching in a plurality of stages a styrene polymer having a high degree of syndiotactic configuration compounded with 0.001 to 1% by weight of inorganic fine particles having an average particle diameter of 0.01 to 3 .mu.m, so that said film has a surface roughness, Ra, of 0.005 to 3 .mu.m and has a static friction coefficient, .mu.s, of 0.03 to 1.0, said stretching and restretching being a mode selected from the group consisting of
• (i) first stage:
• uniaxial stretching in the machine direction in a stretching ratio of 1.2 to 5 and at a temperature from a glass transition temperature to a cool crystallization temperature to obtain an absolute value of birefringence of said film of 3.times.10.sup.-3 to 70.times.10.sup.-3, second stage:
• uniaxial restretching in the transverse direction at a stretching ratio of 1.5 to 5 and at a temperature of 5.degree. C. higher than a glass transition temperature to 30.degree. C. lower than a melting point, third stage:
• uniaxial restretching in the machine direction;
• and
• (ii) first stage:
• biaxial stretching in the machine direction at a stretching ratio of 1.2 to 5 and in the transverse direction at a stretching ratio of 1.2 to 5 and at a temperature from a glass transition temperature to a cool crystallization temperature, second stage:
• uniaxial restretching in the machine direction.