Abstract: A biaxially oriented polypropylene film exhibits excellent withstand voltage characteristics and reliability and secure stable productivity and processability into an element in high-voltage capacitor applications, and therefore is suitable for capacitors and other applications and has high dimensional stability, a low thermal shrinkage at high temperatures, and in particular, a low thermal shrinkage stress. The biaxially oriented polypropylene film has a meso pentad fraction of 95% or more but less than 98%, a thickness of 1 to 3 ?m, and a transversal thermal shrinkage stress at 140° C. of 0 N/mm2 to 1 N/mm2.

Abstract: A biaxially stretched polypropylene film includes protrusions on both surfaces, in which the biaxially stretched polypropylene film has a thickness t1 of 1 ?m to 3 ?m, has a tensile strength in the machine direction of 120 MPa to 250 MPa, has a tensile strength in the transverse direction of 250 MPa to 400 MPa, has a minimum protrusion height Pmin of 100 nm or greater and a maximum protrusion height Pmax of 1,600 nm or smaller for either surface, and satisfies all of Formulae (1) to (3) when one of the surfaces is surface A and the other is surface B: 0.5?Pa250-450/Pa?1.0 (1), 0.5?Pb450-1600/Pb?1.0 (2), and 600?Pa+Pb?1,200 (3).

Abstract: A biaxially stretched polypropylene film includes protrusions on both surfaces, in which the biaxially stretched polypropylene film has a thickness t1 of 1 ?m to 3 ?m, has a tensile strength in the machine direction of 120 MPa to 250 MPa, has a tensile strength in the transverse direction of 250 MPa to 400 MPa, has a minimum protrusion height Pmin of 100 nm or greater and a maximum protrusion height Pmax of 1,600 nm or smaller for either surface, and satisfies all of Formulae (1) to (3) when one of the surfaces is surface A and the other is surface B: 0.5 Pa250-450/Pa?1.0 (1), 0.5?Pb450-1600/Pb?1.0 (2), and 600?Pa+Pb?1,200 (3).