TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The polyarylene sulfide film contains polyarylene sulfide (60-99 wt.pts) and thermoplastic resin (1-40 wt.pts). Preferred Components: The thermoplastic resin is chosen from polyamide, polyether imide, polyether sulfone, and polysulfone. The polyarylene sulfide is polyphenylene sulfide. Preferred Property: The Young's modulus along the longitudinal direction and the width direction of the film is 3-5 GPa. EXAMPLE - Sodium hydrosulfide (in g) (8267.37), sodium hydroxide (2957.21), N-methyl-2-pyrrolidone (NMP) (11434.5), sodium acetate (2583), and ion-exchange water (10500) were heated over 3 hours to 245degrees C. Water (14780.1) and NMP (280) were distilled, and the reaction container was cooled to 160degrees C. P-dichlorobenzene (10235.46) and NMP (9009) were added and heated to 238degrees C. After reacting at 238degrees C for 95 minutes, the reaction mixture was cooled to 250degrees C and then to room-temperature vicinity. The contents were removed, solvent and solid substance were separated, and the solid substance was diluted with NMP (26300). The obtained particles were washed and dried at 80degrees C, to obtain polyphenylene sulfide resin having a viscosity of 200 Pa.second, a glass transition temperature of 90degrees C, and a melting point of 285degrees C. The obtained resin (in weight parts) (100), Amilan CM2001 (RTM: nylon 610) (10), and KBE9007 (RTM: gamma -isocyanate propyl triethoxysilane) (0.5) were kneaded for 90 seconds. The kneaded polymer mixture was cooled with water at 25degrees C and cut immediately to form blend chips. The obtained chips, calcium carbonate powder (0.3) having average particle diameter of 1.2 microns, and calcium stearate (0.05) were disperse-mixed uniformly and dried at 150degrees C for 3 hours under reduced pressure. The resulting polymer mixture was heated at 320degrees C, filtered, cooled to 25degrees C, and cast into non-expanded polyphenylene sulfide film. The obtained non-expanded polyphenylene sulfide film was extended, heat-processed, relaxation-processed and cooled, to form a biaxially-oriented polyphenylene sulfide film having thickness 38 microns, glass transition temperature of 93degrees C, thermal expansion coefficient along machine direction of 45x10-6/degrees C and along transverse direction of 48x10-6/degrees C, breaking elongation of 120% in machine direction and 130% in transverse direction based on JIS K7127, Young's modulus of 3.9 in machine direction and 3.8 in transverse direction based on JIS Z1702, and excellent flexibility, heat resistance based on JIS K7127, and dimensional stability.