Patent Number: 6,294,632

Title: Biaxially oriented polypropylene film

Abstract: A biaxially oriented polypropylene film which has a melt flow rate (MFR) of from 1 to 12 g/10 min and in which the melt viscosity thereof as measured with a rotational rheometer at a shear rate of 0 rad/sec (.eta.0), the melt viscosity thereof as measured with the rheometer at a shear rate of 10 rad/sec (.eta.10), and the MFR thereof satisfy the relationship The biaxially oriented polypropylene film has, when subjected to heat sealing/cutting, a high sealing strength at the heat-sealed part and reduced fluctuations in sealing strength, has excellent stiffness suitable for bag-forming and filling and sealing, and is excellent in transparency and gloss.

Inventors: Shiraishi; Yasuhiro (Chiba, JP), Ando; Yuji (Chiba, JP), Saito; Noriaki (Chiba, JP)

Assignee: Chisso Corporation

International Classification: B29C 55/12 (20060101); B29D 7/01 (20060101); B29D 7/00 (20060101); C08J 5/18 (20060101); C08F 010/00 ()

Expiration Date: 09/25/2018