Patent ID: 8138279

Claim:
A biaxially oriented polyarylene sulfide film made of a polyarylene sulfide resin composition consisting of acid-terminated polyarylene sulfide and Ca-terminated polyarylene sulfide having a melt crystallization temperature of not lower than 160° C. and not higher than 220° C., said biaxially oriented polyarylene sulfide film comprising a thermoplastic resin A which is at least one polymer selected from the group consisting of polyetherimides, polyethersulfones and polysulfones; said thermoplastic resin A constituting a dispersed phase having an average dispersion diameter of 50 nm to 500 nm; a content of said polyarylene sulfide being 70 to 99 parts by weight and a content of said thermoplastic resin A being 1 to 30 parts by weight taking the total content of said polyarylene sulfide and said thermoplastic resin A as 100 parts by weight; said biaxially oriented polyarylene sulfide film having a breaking stress at 200° C. in the machine direction and/or transverse direction of not less than 30 MPa and not more than 90 MPa and having an elongation at break at 200° C. in the machine direction and/or transverse direction of not less than 100% and not more than 250%.