# US 12,600,830 B2 · Biaxially oriented polypropylene film > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,600,830 B2 - Document ID: US12600830B2 - Status: Granted - Kind: B2 - Application number: 17/923,365 - Filed: 2021-06-23 - Published: 2023-07-27 - Granted: 2026-04-14 - Earliest claimed: 2020-06-25 - Assignees: Toyobo Co., Ltd. - Applicants: Toyobo Co., Ltd. - Inventors: Kazuhito Horinouchi; Kouji Yamada; Kensuke Taneki; Toru Imai - Web page: https://patentgrep.com/patent/US12600830B2 ## CPC - C08J 5/18: Manufacture of films or sheets - B29C 55/14: successively - B29K 2023/12: {PP, i.e. polypropylene} - C08J 2323/12: Polypropene - C08J 2423/12: Polypropene - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS ## Abstract Provided is a biaxially oriented polypropylene film that has high stiffness and can easily retain a bag shape when made into a packaging bag even if the film is made thinner, and at the same time, that can maintain water vapor barrier properties even if the film is made thinner, and has few wrinkles in and around the sealed portion when heat-sealed to make a packaging body. The biaxially oriented polypropylene film satisfies the following (1) and (2): (1) a half width of a peak derived from an oriented crystal in a width direction in angular dependency of a (110) plane of polypropyleneα-type crystal obtained by wide-angle X-ray diffraction measurement is 26° or smaller; (2) the ratio of (III) to the total of a crystalline component (I), a restrained amorphous component (II), and an unrestrained amorphous component (III) classified by pulse NMR according to solid-echo method is 7% or lower. ## Claims ### Claim 1 A biaxially oriented polypropylene film, satisfying the following (1) and (2): (1) a half width of a peak derived from an oriented crystal in a width direction in angular dependency of a (110) plane of polypropylene a-type crystal obtained by wide-angle X-ray diffraction measurement is 26° or smaller; (2) the ratio of an unrestrained amorphous component (III) to the total of a crystalline component (I), a restrained amorphous component (II), and the unrestrained amorphous component (III) classified by pulse NMR according to solid-echo method is 7% or lower. ### Claim 2 (depends on 1) The biaxially oriented polypropylene film according to claim 1, further satisfying the following (3), (4), and (5): (3) a heat shrinkage ratio at 150° C. in a longitudinal direction is 10% or lower, and a heat shrinkage ratio at 150° C. in the width direction is 30% or lower; (4) a stress upon 5% elongation at 23° C. in the width direction is 140 MPa or more; (5) the heat shrinkage ratio (%) at 150° C. in the width direction and the stress (MPa) upon 5% elongation at 23° C. in the width direction satisfy the following formula: Stress (MPa) upon 5% elongation at 23° C. in the width direction≥Heat shrinkage ratio (%) at 150° C. in the width direction×4.0+140. ### Claim 3 (depends on 1) The biaxially oriented polypropylene film according to claim 1, further satisfying the following (6) and (7): (6) a heat shrinkage ratio at 120° C. in a longitudinal direction is 2.0% or lower, and a heat shrinkage ratio at 120° C. in the width direction is 10.0% or lower; (7) the heat shrinkage ratio (%) at 120° C. in the width direction and a tensile elastic modulus (GPa) at 23° C. in the width direction satisfy the following formula: Tensile elastic modulus (GPa) at 23° C. in the width direction≥Heat shrinkage ratio (%) at 120° C. in the width direction×0.3+7.0. ### Claim 4 (depends on 1) The biaxially oriented polypropylene film according to claim 1, wherein the biaxially oriented polypropylene film has a refractive index Ny in the width direction of 1.5250 or higher and ΔNy of 0.0240 or higher. ### Claim 5 (depends on 1) The biaxially oriented polypropylene film according to claim 1, wherein the biaxially oriented polypropylene film has a haze of 5.0% or lower. ### Claim 6 (depends on 1) The biaxially oriented polypropylene film according to claim 1, wherein a polypropylene resin constituting the biaxially oriented polypropylene film has a mesopentad fraction of 97.0% or higher. ### Claim 7 (depends on 1) The biaxially oriented polypropylene film according to claim 1, wherein a polypropylene resin constituting the biaxially oriented polypropylene film has a crystallization temperature of 105° C. or higher and a melting point of 160° C. or higher. ### Claim 8 (depends on 1) The biaxially oriented polypropylene film according to claim 1, wherein a polypropylene resin constituting the biaxially oriented polypropylene film has a melt flow rate of 4.0 g/10 min or higher. ### Claim 9 (depends on 1) The biaxially oriented polypropylene film according to claim 1, wherein an amount of a component having a molecular weight of 100,000 or less in a polypropylene resin constituting the biaxially oriented polypropylene film is 35% by mass or more. ### Claim 10 (depends on 2) The biaxially oriented polypropylene film according to claim 2, further satisfying the following (6) and (7): (6) a heat shrinkage ratio at 120° C. in a longitudinal direction is 2.0% or lower, and a heat shrinkage ratio at 120° C. in the width direction is 10.0% or lower; (7) the heat shrinkage ratio (%) at 120° C. in the width direction and a tensile elastic modulus (GPa) at 23° C. in the width direction satisfy the following formula: Tensile elastic modulus (GPa) at 23° C. in the width direction≥Heat shrinkage ratio (%) at 120° C. in the width direction×0.3+7.0. ### Claim 11 (depends on 10) The biaxially oriented polypropylene film according to claim 10, wherein the biaxially oriented polypropylene film has a refractive index Ny in the width direction of 1.5250 or higher and ΔNy of 0.0240 or higher. ### Claim 12 (depends on 11) The biaxially oriented polypropylene film according to claim 11, wherein the biaxially oriented polypropylene film has a haze of 5.0% or lower. ### Claim 13 (depends on 12) The biaxially oriented polypropylene film according to claim 12, wherein a polypropylene resin constituting the biaxially oriented polypropylene film has a mesopentad fraction of 97.0% or higher. ### Claim 14 (depends on 13) The biaxially oriented polypropylene film according to claim 13, wherein a polypropylene resin constituting the biaxially oriented polypropylene film has a crystallization temperature of 105° C. or higher and a melting point of 160° C. or higher. ### Claim 15 (depends on 14) The biaxially oriented polypropylene film according to claim 14, wherein a polypropylene resin constituting the biaxially oriented polypropylene film has a melt flow rate of 4.0 g/10 min or higher. ### Claim 16 (depends on 15) The biaxially oriented polypropylene film according to claim 15, wherein an amount of a component having a molecular weight of 100,000 or less in a polypropylene resin constituting the biaxially oriented polypropylene film is 35% by mass or more.