Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
  • B65D65/38—Packaging materials of special type or form
  • B65D65/40—Applications of laminates for particular packaging purposes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/02—Physical, chemical or physicochemical properties
  • B32B7/022—Mechanical properties
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
  • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
  • C08L23/10—Homopolymers or copolymers of propene
  • C08L23/12—Polypropene
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/03—3 layers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2250/00—Layers arrangement
  • B32B2250/24—All layers being polymeric
  • B32B2250/242—All polymers belonging to those covered by group B32B27/32
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/20—Inorganic coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2255/00—Coating on the layer surface
  • B32B2255/20—Inorganic coating
  • B32B2255/205—Metallic coating
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/31—Heat sealable
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/514—Oriented
  • B32B2307/518—Oriented bi-axially
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
  • B32B2307/538—Roughness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7244—Oxygen barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/724—Permeability to gases, adsorption
  • B32B2307/7242—Non-permeable
  • B32B2307/7246—Water vapor barrier
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
  • B32B2307/734—Dimensional stability
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/732—Dimensional properties
  • B32B2307/737—Dimensions, e.g. volume or area
  • B32B2307/7375—Linear, e.g. length, distance or width
  • B32B2307/7376—Thickness
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/744—Non-slip, anti-slip
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/746—Slipping, anti-blocking, low friction
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B2553/00—Packaging equipment or accessories not otherwise provided for
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/16—Applications used for films
  • C08L2203/162—Applications used for films sealable films
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/30—Applications used for thermoforming

Definitions

• the present invention relates to a polypropylene film, a laminate, a packaging material, and a packaging body, which are particularly suitable for packaging applications.
• Polypropylene film has excellent transparency, mechanical properties, electrical properties, etc., so it is used for various purposes such as packaging, tape, cable wrapping, and electrical insulation such as capacitors.
• packaging applications a laminated film in which a thin film of aluminum (hereinafter, may be referred to as “Al”) is vapor-deposited on a polypropylene film is widely used when gas barrier properties are required.
• Al a thin film of aluminum
• the film obtained by Al vapor deposition becomes opaque, it is not suitable for applications that require visibility of the contents.
• the movement to recycle plastics for packaging has become active, but the film containing the Al-deposited layer is difficult to visually distinguish from the Al foil laminated film, and the recyclability is not sufficient, such as coloring after recycling. There is a problem that there is no such thing.
• the transparent vapor deposition layer such as aluminum oxide (hereinafter, may be referred to as AlOx) or silicon oxide.
• AlOx aluminum oxide
• silicon oxide silicon oxide
• the transparent vapor deposition layer is generally thinner and more brittle than the Al vapor deposition layer, the vapor deposition layer may be peeled off during formation of the vapor deposition layer or in a post-process such as bag making, and defects such as pinholes and cracks may occur in the vapor deposition layer. There is a problem that it is generated and the water vapor barrier property and the oxygen barrier property are easily impaired.
• Patent Document 1 As a polypropylene film suitable for packaging applications, conventionally, in order to increase the degree of surface orientation of the polypropylene film, a proposal of a film in which the molecular weight of the polypropylene resin is controlled to increase the rigidity (for example, Patent Document 1) and a highly crystalline raw material have been proposed. (For example, Patent Document 2) has proposed a film in which the degree of surface orientation is increased and the water vapor barrier property is improved by performing high-magnification stretching in the longitudinal direction or re-longitudinal stretching in the longitudinal direction after biaxial stretching. It was done.
• Patent Document 3 a proposal for a film having smoothness by adding particles to form irregularities on the film surface for the purpose of obtaining appropriate vapor deposition processing and bag-making transportability as a packaging material
• Patent Document 4 A laminated film in which particles are added to the surface layer, and a film having slipperiness by further controlling the thickness of each layer has been proposed (for example, Patent Document 4).
• a polypropylene film for adhesive release a proposal of a film in which a resin having a high melting point different from that of polypropylene resin is dispersed on the surface layer of the polypropylene film in order to impart slipperiness without adding particles (for example, Patent Document 5). was done.
• the present invention is structurally stable against heat during vapor deposition when used for packaging, and has appropriate slipperiness without using a blocking inhibitor or particles, so that a transparent vapor deposition layer is particularly laminated.
• An object of the present invention is to provide a polypropylene film having excellent water vapor barrier property and oxygen barrier property.
• the present inventors have made extensive studies in order to solve the above problems, and have invented the following first polypropylene film of the present invention and the second polypropylene film of the present invention.
• the first polypropylene film of the present invention has at least two types of layers (A layer and B layer) containing a polypropylene resin as a main component, and the B layer is incompatible with the polypropylene resin. Including, when the skewness Sks of the A layer and the B layer measured by the three-dimensional non-contact surface shape measurement are Sk (A) and Sk (B), respectively, the Sk (B) is 5 or more. , The polypropylene film, characterized in that Sk (A) is less than 5.
• the second polypropylene film of the present invention has at least two types of layers (A layer and B layer) containing a polypropylene resin as a main component, and the B layer is thermoplastic incompatible with the polypropylene resin.
• the skewness Sk of the A layer which contains a resin and is measured by three-dimensional non-contact surface shape measurement, is Sk (A), and the surface roughness Sas of the A layer and the B layer are Sa (A) and Sa (B, respectively).
• the Sk (A) is less than 5, and the Sa (A) and the Sa (B) satisfy the formula 1. Equation 1: Sa (B) / Sa (A)> 1.1.
• the present invention is structurally stable against heat during vapor deposition and has appropriate slipperiness without using an antiblocking agent or particles. Therefore, it has a water vapor barrier property and oxygen, especially when a transparent vapor deposition layer is laminated. A polypropylene film having excellent barrier properties can be obtained.
• the longitudinal direction refers to the direction in which the film travels in the polypropylene film manufacturing process, and refers to the winding direction of the roll when the polypropylene film is wound as a roll.
• the width direction means a direction orthogonal to the longitudinal direction in the film plane.
• the first polypropylene film of the present invention has at least two types of layers (A layer and B layer) containing a polypropylene resin as a main component, and the B layer is incompatible with the polypropylene resin. Including, when the skewness Sks of the A layer and the B layer measured by the three-dimensional non-contact surface shape measurement are Sk (A) and Sk (B), respectively, the Sk (B) is 5 or more. , The Sk (A) is less than 5.
• the second polypropylene film of the present invention has at least two types of layers (A layer and B layer) containing a polypropylene resin as a main component, and the B layer is thermoplastic incompatible with the polypropylene resin.
• the skewness Sk of the A layer which contains a resin and is measured by three-dimensional non-contact surface shape measurement, is Sk (A), and the surface roughness Sas of the A layer and the B layer are Sa (A) and Sa (B, respectively).
• the Sk (A) is less than 5, and the Sa (A) and the Sa (B) satisfy the formula 1. Equation 1: Sa (B) / Sa (A)> 1.1.
• the first and second polypropylene films of the present invention may be collectively referred to as the present invention or the polypropylene film of the present invention.
• Sk (A), Sk (B), Sa (A), and Sa (B) are parameters related to the shape and roughness of the surface, both the A layer and the B layer are located on the outermost surface. It becomes.
• the polypropylene film is in the form of a sheet containing 80% by mass or more and less than 100% by mass, preferably 80% by mass or more and 99.9% by mass or less of the polypropylene-based resin when all the constituents are 100% by mass.
• the polypropylene-based resin is a resin in which 90 mol% or more and 100 mol% or less are propylene units when all the constituent units constituting the resin are 100 mol%.
• the "layer containing polypropylene-based resin as a main component" means a layer containing more than 50% by mass and 100% by mass or less of polypropylene-based resin when all the constituents are 100% by mass.
• the "main component” can be interpreted in the same manner below. "Having at least two types of layers (A layer and B layer) containing polypropylene resin as a main component” means having a plurality of layers containing polypropylene resin as a main component, and at least one of the layers has a composition. A mode different from other layers.
• a method of imparting slipperiness to the surface of the polypropylene film there is a method of adding a blocking inhibitor or particles.
• protrusions can be formed on the surface of the film by the anti-blocking agent and particles to impart processability at the time of vapor deposition or bag making.
• the protrusions formed by the above-mentioned blocking inhibitor and particles are hard, so that the thin-film deposition layers are opposed to each other.
• the water vapor barrier property and the oxygen barrier property are easily impaired by causing defects and damage of the thin-film deposition film such as scraping, pinholes and cracks.
• a method using crystal transformation is generally preferably used as a method for imparting slipperiness. More specifically, in the film manufacturing process, ⁇ -crystal spheres are formed and stretched by raising the temperature at which the molten resin composition is solidified on a casting (cooling) drum after melt extrusion to a high temperature of, for example, 60 ° C. or higher. This is a method of forming irregularities on the film surface by transforming thermally unstable ⁇ crystals into ⁇ crystals in the process.
• the surface of the film to be vapor-deposited is preferably a smooth surface from the viewpoint of forming the vapor-filmed film uniformly and uniformly and obtaining excellent water vapor barrier property and oxygen barrier property.
• the temperature is preferably low.
• a polyolefin resin having low crystallinity and a low melting point may be used for the surface of the heat seal layer, and in this case, it may be difficult to apply the method using the above-mentioned crystal transformation.
• the polypropylene film of the present invention has at least two types of layers (A layer and B layer) containing a polypropylene resin as a main component. It is important that the B layer contains a thermoplastic resin that is incompatible with the polypropylene resin.
• the temperature of solidification on the cooling drum after melt extrusion is 10 ° C. or higher and 40 ° C. or lower, preferably 10 ° C. or higher and 35 ° C. or lower, more preferably 10 ° C. or higher and 30 ° C. or lower, and particularly preferably 10 ° C. or higher.
• the temperature is 10 ° C. or higher and 40 ° C. or lower, preferably 10 ° C. or higher and 35 ° C. or lower, more preferably 10 ° C. or higher and 30 ° C. or lower, and particularly preferably 10 ° C. or higher.
• thermoplastic resin which is incompatible with polypropylene resin may be referred to as "incompatible resin”.
• the incompatible resin for example, a polymethylpentene resin or the like can be preferably used.
• the ⁇ -crystal spherulite size is made minute, or all or part of the polypropylene-based resin component is formed as a meso phase. It is possible to suppress the interfacial peeling between the incompatible resin domain and the polypropylene-based resin due to stretching. By suppressing interfacial peeling, surface protrusions can be formed without whitening the polypropylene film, and uneven vapor deposition due to wrinkles in the vapor deposition process and transfer wrinkles during the bag making process are less likely to occur, and good processing suitability can be obtained.
• the content of the incompatible resin is preferably 0.1% by mass or more and 10% by mass or less in 100% by mass of the entire layer. It is more preferably 0.5% by mass or more and 6% by mass or less, further preferably 1% by mass or more and 4% by mass or less, and most preferably 1% by mass or more and 2% by mass or less.
• the content of the incompatible resin in the B layer is 0.1% by mass or more, surface protrusions are efficiently formed on the surface of the B layer, so that the slipperiness of the surface of the B layer is improved, and the vapor deposition process or production is performed. Transfer wrinkles in bag processing are reduced.
• the content of the incompatible resin in the B layer is 10% by mass or less, excessive domain formation in the B layer is suppressed, and transparency due to excessive generation of voids generated at the interface between the resins during stretching is suppressed. The drop is reduced.
• the content (% by mass) of the incompatible resin in the layer A is not particularly limited, but the content of the incompatible resin in the layer B is from the viewpoint of making Sk (A) described later smaller than Sk (B). It is preferably lower than (% by mass), and the layer A may not contain an incompatible resin.
• the incompatible resin it is particularly preferable to use a polymethylpentene resin as the incompatible resin because it has a relatively high affinity with the polypropylene resin and the domain size can be reduced.
• the melting point of the polymethylpentene resin is preferably 185 ° C to 240 ° C, more preferably 220 ° C, from the viewpoint of extrusion stability when blended with polypropylene and surface unevenness using the domain sea-island structure. It is ⁇ 240 ° C.
• the polymer containing 4-methylpentene-1 as the main structural unit is used.
• TPX registered trademark
• MX series TPX
• DX series TPX
• TPX registered trademark
• RT sold as "TPX” (registered trademark) series by Mitsui Chemicals, Inc.
• TPX registered trademark
• MX002, MX004, DX310, DX845, and RT31 have a relatively high affinity with polypropylene-based resins and are preferable from the viewpoint of reducing the domain size.
• the first polypropylene film of the present invention has Sk (A) and Sk, respectively, for the skewness Sk of the A layer and the B layer measured by three-dimensional non-contact surface shape measurement from the viewpoint of achieving both slipperiness and barrier property.
• Sk (B) it is important that Sk (B) is 5 or more and Sk (A) is less than 5. Further, from the same viewpoint, it is important that Sk (A) is less than 5 in the second polypropylene film of the present invention.
• Sk is a parameter indicating the degree of deviation of the surface protrusion shape measured by three-dimensional non-contact surface shape measurement.
• This Sk represents the mean square of Z (x, y) on the reference plane made dimensionless by the cube of the root mean square height Sq, which means skewness, and is a mountain centered on the mean plane. It is an index showing the symmetry between the part and the valley part.
• Sk ⁇ 0 it is biased downward with respect to the average line, that is, it means that there are more valleys than peaks.
• Sk> it is biased upward with respect to the average line, that is, it means that there are more peaks than valleys.
• Sk 0, it means that there is no bias with respect to the average line.
• Sk (Ssk (A), Sk (B), and Sk (D) described later) can be measured by a known measuring instrument having a three-dimensional non-contact surface shape.
• Hitachi High-Tech Science scanning white interference microscope VS1540 can be used. The details of the measurement and analysis conditions when the same measuring instrument is used are shown in Examples.
• the first polypropylene film of the present invention by setting Sk (B) to 5 or more, a mountain portion is appropriately formed on the surface of the B layer, and slipperiness between the polypropylene films or between the polypropylene film and the transport roll Is expressed. Further, by setting Sk (A) to less than 5, there are few peaks and valleys are appropriately formed on the surface of the A layer, so that the total amount of metal and / or inorganic compounds applied by the vapor deposition process is 50% by mass or more. A layer containing a large amount of 100% by mass or less (D layer described later) is formed at a uniform height with few protruding protrusions. Therefore, defects such as pinholes and cracks in the D layer are reduced, and high barrier performance can be exhibited.
• Sk (B) is preferably 7 or more, more preferably 10 or more.
• the upper limit is not particularly limited, but 25 is set from the viewpoint of feasibility, and 20 is set from the viewpoint of obtaining appropriate handleability for reducing uneven vapor deposition due to the influence of wrinkles in the vapor deposition process and wrinkles during the bag making process.
• Sk (A) is preferably 0 or less, more preferably -5 or less, from the viewpoint of suppressing the water vapor permeability and oxygen permeability of the laminate provided with the D layer and realizing sufficient barrier properties.
• the lower limit is not particularly limited, but is set to -20 from the viewpoint of feasibility.
• Sk (A) is preferably 0 or less, more preferably -5 or less, for the same reason.
• the lower limit is not particularly limited, but is set to -20 from the viewpoint of feasibility.
• the blending amount of the polypropylene-based resin and the polypropylene-based resin is set to a preferable range.
• a method of adjusting the stretching conditions can be mentioned.
• the stretching conditions it is possible to adopt a condition in which the stretching ratio in the longitudinal direction is 4.0 times or more, preferably 4.5 times or more by the sequential biaxial stretching method. Further, a condition can be adopted in which the stretching temperature in the longitudinal direction is 125 ° C. or lower, preferably 120 ° C. or lower, more preferably 115 ° C. or lower, and further preferably 105 ° C. or lower. These stretching conditions can be used alone or in combination.
• the first and second polypropylene films of the present invention as a method for controlling Sk (A) within the above range, for example, a polypropylene-based resin having a high degree of crystallinity as a raw material for the A layer (more specifically).
• a polypropylene-based resin having a high degree of crystallinity as a raw material for the A layer (more specifically).
• Polypropylene resin having a mesopentad fraction of 0.93 or more or a polypropylene resin having a melting point of 151 ° C. or higher (preferably 160 ° C. or higher), and then adjusting the film forming conditions and stretching conditions.
• a polypropylene-based resin having a high degree of crystallinity as a raw material for the A layer (more specifically).
• Polypropylene resin having a mesopentad fraction of 0.93 or more or a polypropylene resin having a melting point of 151 ° C. or higher (preferably 160 ° C. or higher)
• the film forming conditions a condition in which the surface of the A layer of the molten sheet is landed on the surface of the cooling drum at the time of film forming and the temperature of cooling solidification is 35 ° C. or lower, preferably 30 ° C. or lower can be preferably adopted.
• the stretching conditions the stretching ratio in the longitudinal direction is 4.0 times or more, preferably 4.5 times or more by the sequential biaxial stretching method, and the stretching temperature in the longitudinal direction is 125 ° C. or lower, preferably 120 ° C.
• conditions of more preferably 115 ° C. or lower, still more preferably 105 ° C. or lower can be adopted. It should be noted that these film forming conditions and stretching conditions can be used alone or in combination.
• the proportion of the propylene unit of the resin component constituting the A layer is 97.0 mol% or more and 100.0 mol% or less, and the proportion of the resin component constituting the entire polypropylene film is the propylene unit. It is preferably more than or equal to the rate.
• the fraction of the propylene unit of the resin component constituting the A layer is the fraction of the propylene unit in the A layer when the constituent unit of all the resin components constituting the A layer is 100 mol%. It refers to the rate (mol%).
• the "division of the propylene unit of the resin component constituting the entire polypropylene film” is the component of the propylene unit in the polypropylene film when the constituent unit of all the resin components constituting the polypropylene film is 100 mol%.
• the rate (mol%) is the fraction of the resin component in propylene units.
• the fraction of the resin component in propylene units can be measured by a known 13 C-NMR method.
• the lower limit of the fraction of the propylene unit in the A layer is preferably 99.0 mol%, more preferably 99.5 mol%.
• the fraction of the propylene unit in the A layer is 99.5 mol% or more may contain a small amount of impurities, but the molecular chain of the polypropylene-based resin constituting the A layer is composed of only the substantially polypropylene unit.
• a polypropylene-based resin is also called a homopolypropylene resin.
• the method in which the fraction of the propylene unit in the A layer is 97.0 mol% or more and 100.0 mol% or less or the above-mentioned preferable range is not particularly limited, but for example, the fraction of the propylene unit in the A layer is not particularly limited.
• a method using a polypropylene-based resin having a weight of 97.0 mol% or more and 100.0 mol% or less can be mentioned.
• the fraction of the propylene unit to the A layer can be increased.
• the melting point of the polypropylene-based resin, which is the main component of the A layer is preferably 151 ° C. or higher, more preferably 155 ° C. or higher, and even more preferably 160 ° C. or higher. It is more preferably 162 ° C. or higher, particularly preferably 164 ° C. or higher, and most preferably 166 ° C. or higher. Since the melting point of the polypropylene-based resin, which is the main component of the A layer, is 151 ° C. or higher, the crystallinity of the A layer is kept high, so that the deformation of the polypropylene film due to heat during vapor deposition is reduced.
• the second polypropylene film of the present invention has Sa (Sa (A) and Sa (B), respectively, when the surface roughness Sa of the A layer and the B layer is set to Sa (A) and Sa (B), respectively, from the viewpoint of achieving both slipperiness and barrier property. It is important that A) and Sa (B) satisfy Equation 1. Further, from the same viewpoint, in the first polypropylene film of the present invention, it is preferable that Sa (A) and Sa (B) satisfy the formula 2. Equation 1: Sa (B) / Sa (A)> 1.1 Equation 2: Sa (B) / Sa (A)> 1.0.
• the surface roughness Sa is a parameter representing the average of the absolute values of the height differences of each point with respect to the average surface of the surface measured by the three-dimensional non-contact surface shape measurement, and is used for the measurement.
• a measuring instrument similar to Sk can be used.
• the surface of the B layer is rougher than the surface of the A layer, and the surface of the A layer is smoother than the surface of the B layer.
• the slipperiness when winding the polypropylene film can be improved.
• the surface of the A layer becomes sufficiently smooth, and when the D layer described later is laminated, the thickness of the D layer can be made uniform and defects such as pinholes and cracks in the D layer can be suppressed. Therefore, the water vapor barrier property and the oxygen barrier property of the laminated body in which the D layer is laminated can be improved.
• the relationship of the formula 1 in the polypropylene film of the present invention is preferably Sa (B) / Sa (A)> 1.2, more preferably Sa (B) / Sa (A)> 1.5, and even more preferably. Is Sa (B) / Sa (A)> 1.8.
• the upper limit of Sa (B) / Sa (A) in the polypropylene film of the present invention is preferably 4.0 and more preferably 3.5 from the viewpoint of not impairing the balance between slipperiness and barrier property.
• Sa (B) / Sa (A) is set to a value larger than 1.0 or the above-mentioned preferable range
• Sa (B) / As a method for setting Sa (A) to a value larger than 1.1 or the above-mentioned preferable range for example, a method similar to the method for adjusting Sk (A) or Sk (B) can be adopted.
• the polypropylene film of the present invention preferably has a thickness of more than 10 ⁇ m and 60 ⁇ m or less from the viewpoint of being suitable for packaging applications.
• the thickness By making the thickness larger than 10 ⁇ m, it is possible to prevent the film from tearing due to sagging and tension during vapor deposition processing and transportation.
• the lower limit of the thickness is more preferably 12 ⁇ m, further preferably 14 ⁇ m, and particularly preferably 19 ⁇ m.
• the thickness is more preferably 50 ⁇ m, further preferably 40 ⁇ m.
• the thickness of the polypropylene film can be measured using a contact type electronic micrometer in an atmosphere of 23 ° C. and 65% RH.
• a contact type electronic micrometer for example, an electronic micrometer manufactured by Anritsu Co., Ltd. (K-312A type) or the like can be used.
• the method of setting the thickness to more than 10 ⁇ m and 60 ⁇ m or less or the above-mentioned preferable range is not particularly limited, and for example, a method of adjusting the discharge amount during melt extrusion of a polypropylene-based resin composition or a method of cooling and solidifying a molten sheet.
• a method of adjusting the rotation speed of the cast drum, a method of adjusting the lip gap of the base for discharging the molten sheet, a method of adjusting the stretching ratio in the longitudinal direction, a method of adjusting the stretching ratio in the width direction, and the like can be used. More specifically, the thickness can be reduced by lowering the discharge amount, increasing the rotation speed of the cast drum, reducing the lip gap of the base, and increasing the stretching ratio in the longitudinal direction and the width direction. ..
• the thickness of the A layer is preferably 0.3 ⁇ m or more and 10 ⁇ m or less. Within such a range, even if the surface of the A layer of the polypropylene film is at a low temperature, stretching is easy, so that high orientation and smoothing can be easily realized. Therefore, when the D layers formed by vapor deposition or the like are laminated to form a laminated body, the thickness of the vapor-filmed film becomes uniform, the quality of the vapor-filmed film is improved, and the water vapor barrier property and the oxygen barrier property of the laminated body are also improved.
• the thickness of the layer A is more preferably 0.5 ⁇ m or more and 5.0 ⁇ m or less, and further preferably 0.8 ⁇ m or more and 3.0 ⁇ m or less.
• a method for adjusting the thickness of the layer A the same method as the method for adjusting the thickness to more than 10 ⁇ m and 60 ⁇ m or less or the above-mentioned preferable range can be used.
• the thickness of layer A can be measured by preparing an ultrathin section using a microtome so that the cross section in the longitudinal-thickness direction of the polypropylene film is the observation surface, and measuring this from a cross-sectional photograph taken with a transmission electron microscope. can. Not only the A layer but also the thickness of each layer constituting the polypropylene film or the laminated body can be measured by the same method.
• the polypropylene film of the present invention does not cause uneven vapor deposition due to the influence of wrinkles in the vapor deposition process or wrinkles during the bag making process, and therefore, from the viewpoint of imparting appropriate slipperiness, when the surface opposite to one surface of the film is overlapped.
• the static friction coefficient ( ⁇ s) is preferably 0.3 or more and 1.0 or less. When ⁇ s is 0.3 or more, the slipperiness of the film does not become excessive, and the unwinding that occurs during winding, vapor deposition processing, and bag making during film formation is reduced.
• ⁇ s is 1.0 or less, the deterioration of the slipperiness of the film is suppressed, so that the handling property is improved, and the occurrence of uneven vapor deposition and wrinkles during the bag making process due to the influence of wrinkles in the thin film deposition process is reduced.
• Ru is more preferably 0.3 or more and 0.8 or less, still more preferably 0.4 or more and 0.6 or less.
• the coefficient of static friction ( ⁇ s) can be measured at 25 ° C. and 65% RH according to JIS K7125 (1999).
• a slip tester manufactured by Toyo Seiki Co., Ltd. can be used (other measurement conditions are shown in Examples).
• a method of controlling the static friction coefficient ( ⁇ s) within the above range for example, a method of adjusting the stretching conditions after setting the blending amount of the polypropylene-based resin and the polypropylene-based resin incompatible resin in a preferable range.
• the stretching conditions it is possible to adopt a condition in which the stretching ratio in the longitudinal direction is 4.0 times or more, preferably 4.5 times or more by the sequential biaxial stretching method. Further, a condition can be adopted in which the stretching temperature in the longitudinal direction is 125 ° C. or lower, preferably 120 ° C. or lower, more preferably 115 ° C. or lower, and further preferably 105 ° C. or lower. These stretching conditions can be used alone or in combination.
• the sum of the heat shrinkage in the longitudinal direction and the width direction after the heat treatment at 125 ° C. for 10 minutes is preferably 4.0% or less, more preferably 3.5% or less, still more preferably. Is 3.0% or less, most preferably 2.5% or less.
• the lower limit is not particularly limited, but is about -2.0%.
• a high mesopentad fraction and a cold xylene-soluble portion are used.
• examples thereof include a method of appropriately applying a heat fixing treatment and a relaxation treatment after biaxial stretching to a film using a polypropylene raw material having a low (CXS). It is also effective to increase the ratio of the incompatible resin in the B layer within the above-mentioned preferable range.
• the width direction and the longitudinal direction are determined by using the following procedure.
• a rectangular sample with a size of 20 mm or more (measurement direction) x 10 mm is arbitrarily obtained from the film, and a tensile test is performed with a measurement length of 20 mm, a tensile speed of 300% / min, and a measurement environment of 23 ° C. and 65% RH.
• the breaking strength (MPa) is measured with a machine (for example, "Tensilon" (registered trademark) UCT-100 manufactured by Orientec).
• the same measurement is performed with the measurement direction rotated to the right by 15 ° in the film surface, and this is repeated until the measurement direction becomes 12 directions.
• the obtained measured values are compared, and the measuring direction in which the maximum value of the breaking strength (MPa) is obtained is regarded as the width direction, and the direction orthogonal to the width direction is regarded as the longitudinal direction.
• the direction in which the diffraction intensity of the diffraction intensity distribution is highest is defined as the width direction, and the direction orthogonal to this is defined as the longitudinal direction.
• the polypropylene film of the present invention is excellent in structural stability against heat during vapor deposition, and particularly has good water vapor barrier property and oxygen barrier property when a transparent vapor deposition layer is laminated, so that it is suitably used for packaging applications. Can be done.
• the object to be packaged in the polypropylene film of the present invention is not particularly limited, and examples thereof include those easily denatured by water vapor and oxygen, such as foods, pharmaceuticals, and fresh flowers.
• the polypropylene-based resin used as a main component in the A layer of the polypropylene film of the present invention preferably has a mesopentad fraction of 0.93 or more.
• the mesopentad fraction is more preferably 0.95 or more, further preferably 0.96 or more, and particularly preferably 0.97 or more.
• the mesopentad fraction is an index showing the stereoregularity of the crystal phase of a polypropylene resin, and is measured by a nuclear magnetic resonance method (NMR method).
• the crystallinity of the A layer is increased by using a polypropylene resin having a mesopentad fraction of 0.93 or more as the main component of the A layer, and the polypropylene film (particularly the A layer) is thermally stable. It has the effect of enhancing sex. This suppresses deformation due to heat during vapor deposition when the polypropylene film is used for packaging, facilitates uniform lamination of the D layer including the vapor deposition film, and causes pinholes and cracks in the D layer. Defects such as these can also be suppressed. Therefore, the effect of improving the water vapor barrier property and the oxygen barrier property of the laminated body in which the D layer is laminated can be obtained.
• the upper limit of the mesopentad fraction of the polypropylene resin, which is the main component of the A layer is not particularly specified.
• the polypropylene-based resin used as the main component in the A layer of the polypropylene film of the present invention is a polypropylene component (CXS) dissolved in xylene when the polypropylene film is completely dissolved with xylene and then precipitated at room temperature.
• CXS polypropylene component
• a cold xylene-soluble portion is preferably less than 4.0% by mass.
• the cold xylene soluble part (CXS) corresponds to a component that is difficult to crystallize due to reasons such as low stereoregularity and low molecular weight.
• CXS is preferably 2.0% by mass or less, more preferably 1.5% by mass or less.
• a method of increasing the catalytic activity when obtaining the polypropylene resin to be used, a method of washing the obtained polypropylene resin with a solvent or the propylene monomer itself, etc. Method can be used.
• the lower limit of CXS is not particularly limited, but it is practical that it is 0.1% by mass. This is because by keeping CXS at 0.1% by mass or more, deterioration of stretchability during film formation can be reduced and the occurrence of film tear can be reduced.
• the amount of CXS is determined by dissolving 0.5 g of the sample in 100 ml of xylene at 135 ° C., allowing it to cool, recrystallizing it in a constant temperature water bath at 20 ° C. for 1 hour, filtering it, and dissolving it in the filtrate. This is possible by quantitatively evaluating the components by a liquid chromatograph method.
• the polypropylene-based resin used for the A layer of the polypropylene film of the present invention may be one kind or a mixture of two or more kinds.
• an adhesive polypropylene resin may be added from the viewpoint of obtaining the interfacial adhesion between the D layer and the A layer.
• the melting point of the polypropylene-based resin as the main component is preferably 151 ° C. or higher, more preferably 155 ° C. or higher, and more preferably 160 ° C. or higher. It is more preferably 162 ° C. or higher, particularly preferably 164 ° C.
• the melting point of the polypropylene-based resin, which is the main component of the A layer is 160 ° C. or higher, the crystallinity of the A layer is kept high, so that the deformation of the polypropylene film due to heat during vapor deposition is reduced. That is, when the D layer is laminated by vapor deposition or the like, defects such as pinholes and cracks in the D layer are reduced, and the water vapor barrier property and the oxygen barrier property of the laminated body in which the D layer is laminated are enhanced.
• the A layer of the polypropylene film of the present invention is optionally an organic particle, an inorganic particle, a heat stabilizer, a crystal nucleating agent, a chlorine scavenger, a slip agent, an antistatic agent, an antiblocking agent, and a filler.
• Viscosity modifiers, anticoloring agents, antioxidants and the like can be included.
• the smaller the content of these components in the A layer the smaller the content of these components in the A layer, from the viewpoint of improving the uniformity of the vapor-filmed layer or suppressing defects such as pinholes when the D layers are laminated by vapor deposition or the like to form a laminated body.
• 3% by mass or less is preferable, and 1% by mass or less is more preferable in all the components constituting the A layer.
• the polypropylene-based resin used in the polypropylene film of the present invention has a melt flow rate measured at 230 ° C. under a 21.18 N load from the viewpoint of film-forming property in all of the A layer, B layer, and C layer (described later).
• (MFR) is preferably 1 to 20 g / 10 minutes, more preferably 2 to 10 g / 10 minutes, and even more preferably 2 to 5 g / 10 minutes.
• MFR melt flow rate measured under the conditions to the above value.
• the layer structure of the polypropylene film of the present invention is not particularly limited as long as it has an A layer and a B layer, the A layer is located on the outermost surface of at least one of them, and the B layer is located on the outermost surface of the opposite surface. That is, it may be a two-kind two-layer structure composed of an A layer and a B layer, or it may be an embodiment in which another layer is provided between the A layer and the B layer. As an embodiment having another layer between the A layer and the B layer, for example, it is preferable to have a layer (C layer) containing a polypropylene resin as a main component between the A layer and the B layer.
• a layer (C layer) containing a polypropylene resin as a main component between the A layer and the B layer.
• the simplest example of such an embodiment is a three-layer configuration of A layer / C layer / B layer, but there is another layer between the A layer and the C layer or between the B layer and the C layer. You may be doing it.
• the composition of the C layer in the polypropylene film of the present invention is not particularly limited as long as it contains a polypropylene-based resin as a main component, but may also contain a polypropylene-based resin having a long-chain branched structure, a petroleum resin, a crystal nucleating agent, and the like. can. Further, it may contain various additives such as antioxidants, heat stabilizers, chlorine scavengers, slip agents, antistatic agents, fillers, viscosity modifiers and anticoloring agents as long as the object of the present invention is not impaired. can.
• the C layer in the polypropylene film of the present invention preferably contains a petroleum resin.
• the petroleum resin is a petroleum resin having no polar group consisting of a hydroxyl group, a carboxyl group, a halogen group, a sulfone group or a variant thereof, and specifically, a petroleum-based unsaturated hydrocarbon is used as a raw material. It is a resin whose main raw material is a cyclopentadiene-based or higher olefin-based hydrocarbon.
• the C layer contains petroleum resin, the uniform stretchability during film formation is enhanced, and the stretching temperature in the longitudinal direction can be set to 120 ° C. or lower. Therefore, it becomes easy to increase the heat resistance of the polypropylene film, and it becomes easy to suitably control the coefficient of static friction. Further, when the C layer contains a petroleum resin, the void volume of the amorphous portion of the polypropylene-based resin can be reduced, and the water vapor barrier property of the polypropylene film can be improved. From the above viewpoint, the amount of the petroleum resin added to the C layer is preferably 2% by mass or more and 20% by mass or less, more preferably 3% by mass or more, assuming that all the constituents of the C layer are 100% by mass. It is 15% by mass or less, more preferably 5% by mass or more and 10% by mass or less.
• the softening point of the petroleum resin is preferably 90 ° C. or higher and 140 ° C. or lower, and more preferably 100 ° C. or higher and 130 ° C. or lower. Within such a range, in addition to the water vapor barrier property of the polypropylene film, it becomes easy to enhance the uniform stretchability during film formation.
• T-REZ HA125 softening point 125 ° C.
• Arcon registered trademark
• P125 manufactured by Arakawa Chemical Industry Co., Ltd.
• Softening point 125 ° C. Softening point 125 ° C.
• the polypropylene film of the present invention has a structure in which the A layer is located on one outermost surface and the B layer is located on the other outermost surface, and at this time, the B layer may play a role as a heat seal.
• the heat seal is a state (or the process) in which the films are melted and crimped through heat treatment when the contents are filled and packaged to take the form of a bag. It is the property of the film that melts and crimps.
• the B layer is a layer having a heat-sealing property.
• the layer having heat-sealing property means a layer having a heat-sealing strength of 2N / 25.4 mm or more measured by the method described later.
• the B layer in the polypropylene film of the present invention contains a polypropylene resin having a lower crystallinity and a lower melting point than the polypropylene resin which is the main component of the A layer from the viewpoint of imparting low temperature and high speed heat sealing properties.
• a polypropylene resin having a lower crystallinity and a lower melting point than the polypropylene resin which is the main component of the A layer from the viewpoint of imparting low temperature and high speed heat sealing properties.
• an ethylene-propylene random copolymer, an ethylene-propylene-butene random copolymer, a propylene-butene random copolymer, or the like can be preferably used.
• the melting point of the B layer is preferably 100 ° C. or higher and lower than 150 ° C., more preferably 110 ° C. or higher and 148 ° C. or lower, and further preferably 120 ° C. or higher and 145 ° C. or lower, from the viewpoint of imparting low-temperature and high-speed sealing properties. ..
• the melting point of the B layer can be read as the lowest peak temperature among the endothermic peaks due to melting when the B layer of the polypropylene film is analyzed by differential scanning calorimetry (DSC).
• the B layer of the polypropylene film of the present invention contains a resin that is incompatible with the polypropylene-based resin described above from the viewpoint of imparting appropriate slipperiness without adding particles or lubricants.
• various additives such as antioxidants, heat stabilizers, chlorine trapping agents, antistatic agents, fillers, viscosity modifiers, and anticoloring agents can be included as long as the object of the present invention is not impaired.
• the method of laminating the B layer is not particularly limited, and examples thereof include a feed block method and a multi-manifold method by melt coextrusion during film formation, as well as extrusion laminating and dry laminating. From the viewpoint of production efficiency and cost, the laminating method by melt coextrusion is preferable.
• the thickness of the B layer of the polypropylene film is not particularly limited, but the lower limit of the thickness of the B layer is preferably 0.5%, more preferably 1%, with respect to the total thickness of the polypropylene film of 100%.
• the upper limit of the thickness of the B layer is preferably 80%, more preferably 60%, still more preferably 40%, and particularly preferably 10% with respect to the total thickness of the polypropylene film of 100%.
• the polypropylene-based resin used for each of the layers A, B, and C of the polypropylene film of the present invention may contain a polypropylene-based resin derived from biomass.
• the content thereof is preferably 5% by mass or more, more preferably 10% by mass or more, when the total polypropylene-based resin constituting each layer is 100% by mass. ..
• the biomass degree of polypropylene derived from biomass is preferably 10% or more.
• the polypropylene film of the present invention contains resin components other than the polypropylene-based resin, these components may be derived from biomass.
• the polypropylene film of the present invention may also contain polypropylene recycled by mechanical recycling or chemical recycling. It is also possible to reduce the environmental load by these.
• the laminated body of the present invention when the layer containing a metal and / or an inorganic compound in a total amount of more than 50% by mass and 100% by mass or less is used as the D layer, the D layer is in contact with the A layer of the polypropylene film of the present invention.
• the D layer has a thickness of 50 nm or less.
• the laminate of the present invention has the polypropylene film of the present invention and a layer (D layer) containing a total of more than 50% by mass and 100% by mass or less of metal and / or inorganic compounds.
• a layer (D layer) containing a total of more than 50% by mass and 100% by mass or less of metal and / or inorganic compounds With such an embodiment, high water vapor barrier property and oxygen barrier property can be realized.
• the "layer containing an inorganic compound or a metal in an amount of more than 50% by mass” means a layer containing only a metal in an amount of more than 50% by mass and only an inorganic compound when all the components constituting the layer are 100% by mass.
• the inorganic compound or metal of the D layer may be, for example, aluminum, aluminum oxide, silicon oxide, cerium oxide, from the viewpoint of improving the adhesion with the polypropylene film, improving the gas barrier property when laminated on the polypropylene film, and reducing the environmental load.
• Either calcium oxide, a diamond-like carbon film, or a mixture thereof is preferably used.
• the thickness of the D layer in the laminate of the present invention is 50 nm or less, preferably 40 nm or less, more preferably 30 nm, from the viewpoint of recyclability of reusing the laminate as a resin or a film, and improving the barrier property by making it difficult to crack. Below, it is more preferably 20 nm or less. The lower limit is not particularly limited, but is set to 1 nm from the viewpoint of developing barrier properties.
• Examples of the method of forming the D layer on the polypropylene film of the present invention to form a laminated body include coating, vapor deposition, laminating and the like, but thin film deposition is preferable because it is independent of humidity and can exhibit excellent gas barrier properties in a thin film. ..
• a vacuum vapor deposition method an EB vapor deposition method, a sputtering method, a physical vapor deposition method such as an ion plating method, and various chemical vapor deposition methods such as plasma CVD can be used, but from the viewpoint of productivity, vacuum vapor deposition can be used.
• the method is particularly preferably used.
• the water vapor permeability of the laminate of the present invention is preferably 2.0 g / m 2 / day or less from the viewpoint of preservability of the contents when used as a packaging material. It is more preferably 1.0 g / m 2 / day or less, and even more preferably 0.5 g / m 2 / day or less. Within such a range, deterioration due to moisture absorption or desorption of the contents can be reduced, especially when used for food packaging.
• the oxygen permeability of the laminate of the present invention is preferably 40 cc / m 2 / day or less from the viewpoint of preservability of the contents when used as a packaging material. It is more preferably 30 cc / m 2 / day or less, still more preferably 20 cc / m 2 / day or less, and most preferably 10 cc / m 2 / day or less. Within such a range, deterioration due to oxidation of the contents can be reduced, especially when used for food packaging.
• the laminate of the present invention preferably has a Sk (D) of less than 5 when the skewness Sk of the D layer measured by a three-dimensional non-contact surface roughness meter is Sk (D).
• Sk (D) By setting Sk (D) to less than 5, there are few peaks and valleys are formed appropriately, and the protrusions protruding on the D layer applied by the vapor deposition process are reduced, so that the vapor deposition layer has a uniform height. Is formed. Therefore, defects such as pinholes and cracks are reduced, and the laminated body can exhibit high barrier performance.
• Sk (D) is preferably 0 or less, more preferably -5 or less, still more preferably -6 or less.
• the lower limit is not particularly limited, but is set to -20 from the viewpoint of maintaining the barrier property.
• a method for controlling Sk (D) within the above range for example, a method using a polypropylene-based resin having a high crystallinity as a raw material (more specifically, a polypropylene-based resin having a mesopentad fraction of 0.93 or more).
• the method of setting the stretching temperature in the longitudinal direction to 125 ° C. or lower, preferably 120 ° C. or lower, more preferably 115 ° C. or lower, still more preferably 110 ° C. or lower, and the thickness of the metal layer when forming the D layer on the polypropylene film surface. Is 50 nm or less.
• the packaging material of the present invention is characterized by having at least one of the polypropylene film of the present invention and the laminate of the present invention.
• the packaging material of the present invention is excellent in structural stability against heat during vapor deposition, and particularly has good water vapor barrier property and oxygen barrier property when a transparent vapor deposition layer is laminated, so that it is easily deteriorated by water vapor or oxygen. It can be suitably used for packaging things.
• the packaging body of the present invention is characterized in that the contents are packed by the packaging material of the present invention.
• the contents are not particularly limited, but since the packaging material of the present invention is excellent in transparency, water vapor barrier property, and oxygen barrier property, visibility from the outside is required and it is liable to be deteriorated by water vapor or oxygen. preferable.
• the package of the present invention is obtained by covering the contents with the packaging material of the present invention, and the embodiment thereof is not particularly limited.
• a package obtained by processing the packaging material of the present invention into a bag shape by heat sealing and putting the contents in the bag can be mentioned. Specific examples of such a package include snack foods, retort pouch foods, and the like.
• a molten polypropylene-based resin or a polypropylene-based resin composition is melt-extruded onto a support to obtain an unstretched polypropylene film.
• this unstretched polypropylene film is stretched in the longitudinal direction, then stretched in the width direction, and sequentially biaxially stretched.
• heat treatment and relaxation treatment are performed to produce a biaxially oriented polypropylene film.
• the polypropylene film of the present invention and the method for producing the same are not necessarily limited to this.
• the unstretched A layer is the a layer
• the unstretched B layer is the b layer
• the unstretched C layer is the c layer, for example, a layer / c layer / It is merged with a feed block or the like so as to be layer b).
• it is extruded from the slit-shaped mouthpiece at a temperature of 200 ° C. to 260 ° C., more preferably 210 ° C. to 240 ° C.
• the resin is sufficiently melted to prevent the molecular chains from being cut due to shearing due to screw rotation, so that the film structure is not relaxed and stabilized even at high temperatures. It is preferable that the temperature after passing through the filtration filter is lower than that before the filtration filter, and the temperature of the base immediately before ejection is set so that a further lower temperature can be achieved in a multi-stage low temperature.
• the molten resin sheet extruded from the slit-shaped mouthpiece has a surface temperature of 10 ° C to 40 ° C, preferably 10 ° C to 35 ° C, more preferably 10 ° C to 30 ° C, and most preferably 10 ° C to 25 ° C. It is cooled and solidified on a controlled casting drum (cooling drum) to obtain an unstretched polypropylene film. At this time, it is preferable to co-extrude and laminate the molten sheet extruded from the mouthpiece so that the drum surface side that first contacts is the A layer.
• the mesophase fraction of the surface layer portion of the unstretched polypropylene film, particularly on the drum surface side (A layer side), is increased so that the unstretched polypropylene film has a mesophase structure. It becomes easy to control the skewness Sk and the surface roughness Sa of the A layer and the B layer within a desired range. Therefore, the surface of the A layer of the obtained polypropylene film becomes smooth, and the thickness uniformity and adhesion of the D layer formed by the vapor-film vapor film or the like are improved.
• any of the methods such as electrostatic application method, adhesion method using surface tension of water, air knife method, press roll method, underwater casting method, and air chamber method can be used.
• the air knife method is preferable because the flatness of the film can be improved and the skewness Sk and the surface roughness Sa can be easily controlled. Further, when the air knife method is used, it is preferable to appropriately adjust the position of the air knife so that air flows to the downstream side of the film formation so as not to cause vibration of the film.
• the meso phase is an intermediate phase between crystalline and amorphous, and is specifically formed when solidified from a molten state at a very fast cooling rate. It is generally known that when a polypropylene-based resin is cooled and solidified, it crystallizes and spherulites grow. It is considered that a difference in stretching stress occurs between crystals and amorphous between crystals, and local stretching spots occur, leading to thickness spots and structural spots. On the other hand, since the meso phase does not take a spherulite morphology, stretching unevenness does not occur and stretching uniformity is high, so that the thickness uniformity when made into a film is high, and the surface roughness is small and tends to be uniform. Further, when the unstretched film contains a meso phase structure, the stretching (longitudinal stretching) temperature in the longitudinal direction can be set to a temperature lower than that of the unstretched propylene film not containing the meso phase.
• the A layer in a laminated polypropylene film having an A layer containing a polypropylene resin having high stereoregularity and a B layer containing a thermoplastic resin incompatible with the polypropylene resin, the A layer can be used as a meso phase.
• the stretching temperature in the longitudinal direction is set to a low temperature of, for example, 120 ° C. or less, the film forming property can be improved and the surface of the A layer can be smoothed.
• the unstretched polypropylene film is biaxially stretched and biaxially oriented.
• the unstretched polypropylene film is preheated by passing it through rolls kept at a lower limit of preferably 70 ° C, more preferably 80 ° C, and an upper limit of preferably 150 ° C, more preferably 130 ° C, still more preferably 110 ° C.
• the lower limit of the unstretched polypropylene film is preferably 70 ° C., more preferably 80 ° C.
• the upper limit is preferably 125 ° C. or lower
• the upper limit is more preferably 120 ° C. or lower, still more preferably 115 ° C. or lower, and particularly preferably 105 ° C. or lower.
• the film is cooled to room temperature to obtain a uniaxially oriented film.
• the temperature (stretching temperature in the width direction) at that time is 150 to 175 ° C, preferably 155 to 170 ° C.
• the draw ratio in the width direction is preferably 8.5 times or more and 20.0 times or less, more preferably 9.0 times or more and 16.0 times or less, and further preferably 10.0 times or more and 12.0 times or less. It is as follows. By setting the draw ratio in the width direction to 8.5 times or more, it is possible to impart high orientation in the width direction while maintaining a high orientation state in the longitudinal direction, and to increase the molecular chain tension in the plane.
• the structural stability of the film against heat during vapor deposition can be improved, and a uniform vapor deposition film can be formed to improve the water vapor barrier property and the oxygen barrier property. Further, by setting the draw ratio in the width direction to 20.0 times or less, it is possible to prevent the film from tearing during film formation and improve the productivity.
• the area stretch ratio is 42.5 times or more and 100 times or less.
• the area stretch ratio can be calculated by multiplying the stretch ratio in the longitudinal direction and the stretch ratio in the width direction.
• the lower limit of the area stretch ratio is more preferably 45.0 times, still more preferably 53.0 times.
• the heat treatment and relaxation treatment while tensioning both ends in the width direction with a clip of the tenter and giving relaxation of 2% or more and 20% or less in the width direction, 140 ° C. or higher and 170 ° C. or lower, more preferably 152 ° C. or higher and 168 ° C. or lower. More preferably, the heat treatment is carried out at a temperature of 154 ° C. or higher and 165 ° C. or lower.
• the structural stability of the film against heat is improved, and when the D layer is formed by thin film deposition to form a laminated body, a heat loss phenomenon in which defects such as pinholes and cracks occur in the D layer. Can be suppressed. As a result, the water vapor barrier property and the oxygen barrier property of the laminate obtained from the polypropylene film can be improved.
• the relaxation rate is preferably 2% or more and 20% or less, more preferably 4% or more and 18% or less, and further preferably 6% or more and 15% or less. If the relaxation rate is less than 2%, the thermal dimensional stability of the film may be insufficient. Therefore, when the D layer is formed by vapor deposition to form a laminated body, the film is deformed and pinholes are formed in the D layer. As a result of defects such as cracks and cracks, the water vapor barrier property and the oxygen barrier property of the laminated body in which the D layer is laminated may be impaired. On the other hand, if the relaxation rate exceeds 20%, the film may loosen too much inside the tenter, resulting in wrinkles in the film after film formation, which may lead to deterioration of mechanical properties and unevenness during vapor deposition.
• the film is guided to the outside of the tenter, the clips at both ends in the film width direction are released in a room temperature atmosphere, and the film edge is slit in the winder process.
• oxygen, nitrogen, hydrogen, argon, carbon dioxide gas or in the atmosphere for the purpose of improving the adhesion of the vapor deposition layer to the surface to be vapor-deposited during use (usually the surface of the A layer), oxygen, nitrogen, hydrogen, argon, carbon dioxide gas or in the atmosphere.
• corona discharge treatment or plasma treatment in an atmosphere gas of silane gas or a mixture thereof.
• the polypropylene film of the present invention thus obtained can be wound into a roll to obtain a final product roll.
• Thickness of Polypropylene Film The thickness of any 10 points of the polypropylene film was measured using a contact type electronic micrometer (K-312A type) manufactured by Anritsu Co., Ltd. in an atmosphere of 23 ° C. and 65% RH. The arithmetic mean value of the thicknesses at the 10 points was taken as the thickness of the polypropylene film (unit: ⁇ m).
• Skewness Sk (A), Sk (B), and Sk (D) The skewness Sk was measured using a scanning white interference microscope VS1540 of Hitachi High-Tech Science Co., Ltd., which is a three-dimensional non-contact surface shape measuring instrument.
• the undulation component is removed from the shooting screen by polynomial fourth-order approximate plane correction using the attached analysis software, and then it is processed by a median (3 ⁇ 3) filter, and then interpolation processing (height data acquisition is performed). The processing of supplementing the pixels that could not be completed with the height data calculated from the surrounding pixels) was performed.
• the measurement is the B surface (B layer surface) of the film surface, the A surface (A layer surface), and the D surface (D layer surface) in the case of a laminated body in which an inorganic compound layer or a metal layer is laminated.
• the average value measured at 5 points was calculated.
• the measurement conditions were as follows. ⁇ Measurement conditions> Manufacturer: Hitachi High-Tech Science Corporation Equipment name: Scanning white interference microscope VS1540 Measurement conditions: Objective lens 10 ⁇ Lens barrel 1 ⁇ Zoom lens 1x Wavelength filter 530nm white Measurement mode: Wave Measurement software: VS-Measure Version 10.0.4.0 Analysis software: VS-Viewer Version 10.0.3.0 Measurement area: 0.561 x 0.561 mm 2 .
• Thickness of each layer of A layer, B layer and C layer, inorganic compound layer or D layer corresponding to metal layer in polypropylene film In the case of a laminated body in which a film or an inorganic compound layer or a metal layer is laminated, the laminated body is made of an epoxy resin. Ultrathin sections were prepared using a microtome so that the longitudinal-thickness cross section of the film was the observation surface. A cross-sectional photograph of an ultrathin section was taken with a transmission electron microscope at a magnification of 20,000 times, and the thickness of each layer in the center portion in the film width direction was confirmed. The thickness unit of the observed A layer, B layer and C layer was " ⁇ m", and the thickness unit of the D layer was "nm".
• Static friction coefficient ( ⁇ s) The measurement was carried out at 25 ° C. and 65% RH according to JIS K 7125 (1999) using a slip tester manufactured by Toyo Seiki Co., Ltd. The measurement was carried out so that the longitudinal directions of the films coincided with each other, and one surface of the film and the opposite surface thereof were overlapped with each other. The test was performed 5 times, and the average value of the obtained values was calculated and used as the static friction coefficient ( ⁇ s) of the sample.
• the heat shrinkage was calculated from the obtained l0 and l1 by the following formula, and the average value of the five pieces was taken as the heat shrinkage in each direction, and the sum was calculated.
• Heat shrinkage rate ⁇ (l0-l1) / l0 ⁇ x 100 (%).
• the bonded product in the peeling test was sampled in the form of a strip having a width of 20 mm and a length of 150 mm, and the heat seal strength was measured at a tensile speed of 300 mm / min. This measurement was performed three times, the average value of the obtained values was obtained, and the obtained value was taken as the heat seal strength (N / 25.4 mm). If the heat seal strength can be achieved at 2N / 25.4 mm or more, it is judged that the heat seal property is acceptable ( ⁇ ), and if it is less than 2N / 25.4 mm, the heat seal property is rejected ( ⁇ ). It was determined that there was.
• Adhesion of thin-film vapor deposition layer A film roll is set in a vacuum vapor deposition apparatus equipped with a film traveling device, and the pressure is reduced to a high pressure of 1.00 ⁇ 10 ⁇ 2 Pa, and then through a cooling metal drum at 20 ° C. The aluminum metal was heated and evaporated to form a thin-film vapor-deposited thin film layer on the A layer. At that time, the vapor deposition film was controlled to be about 40 nm. After vapor deposition, the inside of the vacuum vapor deposition apparatus is returned to normal pressure, the wound film is rewound, and the film is aged at a temperature of 40 ° C.
• Nichiban's "Cellotape” (registered trademark) was attached to the surface side of the vapor-filmed layer of the obtained laminate with a load of 2 kg using a rubber roller, and the peeling angle was 180 ° and the peeling speed was 3000 m using a peeling tester. It peeled off at / min. The surface of the laminated body after the cellophane tape was peeled off was visually confirmed, and the adhesion of the thin-film deposition layer was determined according to the following criteria.
• ⁇ The above was regarded as good adhesion, and ⁇ was regarded as a level that does not cause any practical problem.
• ⁇ The vapor deposition layer is not peeled off at all.
• ⁇ Most of the vapor-filmed layer is not peeled off, but only a small part is peeled off.
• ⁇ A small part of the vapor deposition layer was not peeled off, but most of it was peeled off.
• X The entire surface of the thin-film deposition layer is peeled off.
• the inside of the vacuum vapor deposition apparatus is returned to normal pressure, the wound film is rewound, and the film is aged at a temperature of 40 ° C. for 2 days in a rolled state to form a laminate in which an AlOx vapor deposition layer is laminated on a polypropylene film. Obtained.
• the Al-deposited or AlOx-deposited laminate was measured using a water vapor transmittance measuring device PERMATRAN-W3 / 30 manufactured by MOCON / Modern Controls under the conditions of a temperature of 40 ° C. and a humidity of 90% RH. The measurement was performed 5 times for each sample, and the average value of the obtained values was calculated and used as the water vapor transmittance of the film (unit: g / m 2 / day). From the obtained water vapor transmittance, the water vapor barrier property of the laminated body was determined according to the following criteria. ⁇ The above is considered to have good water vapor barrier property, and ⁇ is considered to be a level that does not cause any practical problem. ⁇ : 0.5 g / m 2 / day or less.
• ⁇ Greater than 0.5 g / m 2 / day and 1.0 g / m 2 / day or less. ⁇ : Greater than 1.0 g / m 2 / day and 2.0 g / m 2 / day or less. X: greater than 2.0 g / m 2 / day.
• the oxygen barrier property of the laminated body was determined according to the following criteria. ⁇ The above is considered to have good oxygen barrier properties, and ⁇ is considered to be a level that does not cause any practical problems. ⁇ : 10 cc / m 2 / day or less. ⁇ : Greater than 10 cc / m 2 / day and 20 cc / m 2 / day or less. ⁇ : Greater than 20 cc / m 2 / day and 40 cc / m 2 / day or less. X: Greater than 40 cc / m 2 / day.
• A1 Homopolypropylene resin ("F133A” manufactured by Prime Polymer Co., Ltd. (mesopentad fraction: 0.97 melting point: 167 ° C. MFR: 3.0 g / 10 min, CXS: 1.5% by mass, fraction in propylene unit: 99.5 mol% or more))
• A2 Homopolypropylene resin ("F113G” manufactured by Prime Polymer Co., Ltd. (Mesopentad fraction: 0.94 melting point: 162 ° C.
• A3 Ethylene-propylene random copolymer (“WFW4M” manufactured by Nippon Polypro Co., Ltd. (melting point: 135 ° C. MFR: 7.0 g / 10 min, metallocene type, propylene content: 95.0%))
• WFW4M Ethylene-propylene random copolymer
• A4 Homopolypropylene resin (manufactured by Repsol (melting point: 153 ° C. MFR: 3.0 g / 10 min, CXS: 1.5% by mass, fraction of propylene unit: 99.5 mol% or more)).
• AM1 A2 (90 parts by mass), polymethylpentene resin 2 (10 parts by mass), and antioxidant (0.1 parts by mass) are kneaded and extruded with an extruder set at 260 ° C., and then the strands are water-cooled and then chipped. Masterbatch produced by making.
• B1 Ethylene-propylene random copolymer (“WFW5T” manufactured by Japan Polypropylene Corporation (melting point: 130 ° C., MFR: 3.5 g / 10 min, metallocene type)).
• B2 Homopolypropylene resin (same as A1).
• BM1 B1 (90 parts by mass), polymethylpentene resin 1 (10 parts by mass), and antioxidant (0.1 parts by mass) are kneaded and extruded with an extruder set at 260 ° C., and then the strands are water-cooled and then chipped.
• BM2 B1 (90 parts by mass), polymethylpentene resin 2 (10 parts by mass), and antioxidant (0.1 parts by mass) are kneaded and extruded with an extruder set at 260 ° C., and then the strands are water-cooled and then chipped.
• BM3 B2 (90 parts by mass), polymethylpentene resin 1 (10 parts by mass), and antioxidant (0.1 parts by mass) are kneaded and extruded with an extruder set at 260 ° C., and then the strands are water-cooled and then chipped. Masterbatch produced by making.
• CM1 C1 (70 parts by mass), petroleum resin 1 (30 parts by mass), and antioxidant (0.1 parts by mass) are kneaded and extruded with an extruder set at 240 ° C., and then the strands are water-cooled and then chipped.
• CM2 C2 (70 parts by mass), petroleum resin 1 (30 parts by mass), and antioxidant (0.1 parts by mass) are kneaded and extruded with an extruder set at 240 ° C., and then the strands are water-cooled and then chipped.
• Polymethylpentene resin 1 "TPX” (registered trademark) manufactured by Mitsui Chemicals, Inc. (DX845, melting point 232 ° C, MFR: 9 g / 10 min (measured at a temperature of 260 ° C))
• Polymethylpentene resin 2 "TPX” (registered trademark) manufactured by Mitsui Chemicals, Inc. (MX004, melting point 228 ° C, MFR: 25 g / 10 min (measured at a temperature of 260 ° C))
• Petroleum resin 1 T-REZ HA125 (manufactured by JXTG Energy Co., Ltd.).
• Antioxidant "Irganox” (registered trademark) 1010 (manufactured by BASF Japan Ltd.)
• P1 Silica particles (SFP-20MHE (silane coupling surface treatment) manufactured by Denki Kagaku Kogyo Co., Ltd.) (average particle diameter: 0.3 ⁇ m).
• Example 1 A1 was used as a raw material for the A layer.
• the raw material for the B layer a mixture of B1 and BM1 at 80:20 (mass ratio) was used.
• a raw material for the C layer a mixture of C1 and CM1 at a ratio of 75:25 (mass ratio) was used.
• These raw materials are supplied to separate single-screw extruders, melt-extruded at 260 ° C., foreign matter is removed with an 80 ⁇ m-cut sintering filter, and then A / C / B three-layer stacking is performed using a feed block.
• the extrusion amount was adjusted so that the stacking ratio was 1/23/1, and the molten laminated polymer was discharged from the T die. Then, the discharged molten sheet was brought into close contact with an air knife on a casting drum held at 20 ° C. so that the A layer side was in contact with the drum surface and cooled and solidified to obtain an unstretched sheet. Next, the unstretched sheet was preheated stepwise to 105 ° C. in a plurality of roll groups, passed through the rolls provided with a peripheral speed difference as it was, and stretched 5.2 times in the longitudinal direction to form a uniaxially oriented film. did.
• the obtained uniaxially oriented film is guided to a tenter, stretched 10.5 times in the width direction at 165 ° C. while holding both ends in the width direction with clips, and then relaxed at 155 ° C. in the width direction by 10%.
• the heat treatment was performed in.
• the film is guided to the outside of the tenter to release the clips at both ends in the film width direction, and then the carbon dioxide gas concentration ratio is applied to the film surface (casting drum contact surface side: layer A) at a processing strength of 25 W / min / m 2 .
• the corona discharge treatment was performed in a mixed gas atmosphere of carbon dioxide gas and nitrogen gas adjusted to 15% by volume.
• the biaxially oriented polypropylene film having a thickness of 25 ⁇ m thus obtained was wound as a roll. Further, a laminated body in which an Al-deposited layer was provided as a D layer on the A layer side of the film of this example was obtained. Table 1 shows the characteristics of the obtained biaxially oriented polypropylene film and the laminate.
• Example 2 A biaxially oriented polypropylene film was produced in the same manner as in Example 1, and a laminate having an AlOx thin-film deposition layer as a D layer on the A layer side thereof was obtained.
• Table 1 shows the characteristics of the obtained biaxially oriented polypropylene film and the laminate.
• Examples 3 to 10, Comparative Examples 2 to 4 A biaxially oriented polypropylene film and a laminate were obtained in the same manner as in Example 2 except that the raw materials and film forming conditions were changed as shown in Table 1.
• Table 1 shows the characteristics of the obtained biaxially oriented polypropylene film and the laminate.
• A1 was used as a raw material for the A layer, supplied to a single-screw extruder, melt-extruded at 250 ° C., foreign matter was removed with an 80 ⁇ m-cut sintering filter, and the molten polymer was discharged from a T-die. Then, the discharged molten sheet was brought into close contact with an air knife on a casting drum held at 30 ° C. and cooled and solidified to obtain an unstretched sheet. Next, the unstretched sheet was preheated stepwise to 135 ° C.
• the obtained uniaxially oriented film was guided to a tenter, stretched 8.2 times in the width direction at 160 ° C. while holding both ends in the width direction with clips, and then relaxed by 6.7% in the width direction.
• the heat treatment was performed at 168 ° C. After that, the film is guided to the outside of the tenter to release the clips at both ends in the film width direction, and then the carbon dioxide gas concentration ratio is applied to the film surface (casting drum contact surface side: layer A) at a processing strength of 25 W / min / m 2 .
• the corona discharge treatment was performed in a mixed gas atmosphere of carbon dioxide gas and nitrogen gas adjusted to 15% by volume. Finally, the biaxially oriented polypropylene film having a thickness of 25 ⁇ m thus obtained was wound as a roll.
• Table 1 shows the characteristics of the obtained biaxially oriented polypropylene film and the laminate.
• the extrusion amount was adjusted so that the stacking ratio was 1/22/1, and the molten laminated polymer was discharged from the T die.
• a biaxially oriented polypropylene film and a laminate were obtained in the same manner as in Example 2 except that the film forming conditions were changed as shown in Table 1.
• Table 1 shows the characteristics of the obtained biaxially oriented polypropylene film and the laminate.
• Comparative Example 1 Since Comparative Example 1 has a single-layer structure, the layer constituting the film was treated as the A layer. Comparative Examples 2 and 3 did not contain a thermoplastic resin that was incompatible with the polypropylene-based resin, but the layer containing B1 as a main component was regarded as the B layer. The fraction of the propylene unit in the A layer of Comparative Example 5 was calculated assuming that the fraction of the propylene unit of A2 was 100 mol%.
• the polypropylene film of the present invention is structurally stable against heat during vapor deposition and has appropriate slipperiness without using a blocking inhibitor or particles, and thus has a water vapor barrier especially when a transparent vapor deposition layer is laminated. Has excellent properties and oxygen barrier properties. Therefore, it can be suitably used for packaging.

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• 2021
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