GB2521186A - Polypropylene composition, film thereof, and metallized film - Google Patents

Polypropylene composition, film thereof, and metallized film Download PDF

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Publication number
GB2521186A
GB2521186A GB1322001.7A GB201322001A GB2521186A GB 2521186 A GB2521186 A GB 2521186A GB 201322001 A GB201322001 A GB 201322001A GB 2521186 A GB2521186 A GB 2521186A
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United Kingdom
Prior art keywords
polypropylene
weight
propylene
parts
metallized
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GB1322001.7A
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GB201322001D0 (en
Inventor
Woon Kuan Lee
Hideaki Hori
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Polyolefin Company Singapore Pte Ltd
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Polyolefin Company Singapore Pte Ltd
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Priority to GB1322001.7A priority Critical patent/GB2521186A/en
Publication of GB201322001D0 publication Critical patent/GB201322001D0/en
Publication of GB2521186A publication Critical patent/GB2521186A/en
Withdrawn legal-status Critical Current

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    • 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
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal 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
    • B32B15/085—Layered products comprising a layer of metal comprising metal 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 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
    • 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
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • 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
    • B65D37/00—Portable flexible containers 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
    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/08—Copolymers of ethene
    • C08L23/0807—Copolymers of ethene with unsaturated hydrocarbons only containing more than three carbon atoms
    • C08L23/0815—Copolymers of ethene with aliphatic 1-olefins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • 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
    • C08L23/14—Copolymers of propene
    • 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
    • C08L23/14—Copolymers of propene
    • C08L23/142—Copolymers of propene at least partially crystalline copolymers of propene with other olefins
    • 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
    • C08L23/18—Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/20—Metallic material, boron or silicon on organic substrates
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/06—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of metallic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/08—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of metallic material
    • C23C18/10—Deposition of aluminium only
    • 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
    • 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
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/21—Anti-static
    • 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
    • B32B2307/306—Resistant to heat
    • 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
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/406—Bright, glossy, shiny surface
    • 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
    • B32B2307/72—Density
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • 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
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/24—Aluminium
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/043—HDPE, i.e. high density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • 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
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure

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  • Chemical & Material Sciences (AREA)
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  • Organic Chemistry (AREA)
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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Mechanical Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
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Abstract

A metallized polypropylene film comprising a polypropylene (PP) layer comprising a polypropylene (A) and a metallized layer disposed on the polypropylene layer, wherein the metallised layer is made of a metal or a metal oxide (i.e. aluminium, titanium, chromium, nickel, germanium, tin selenium, silica or aluminium oxide of 100 1000 Ǻ thickness), where polypropylene (A) satisfies: (1) melting point is 115°C to 130°C; (2) quantity of 20°C xylene solubles is 5.5 to 10 wt%; (3) melt flow rate is 0.1 to 20 g/10 minutes. Also claimed is a second polypropylene composition, which has 65 to 99 wt% of polypropylene (A) and 1 to 35 wt% of polypropylene (B), where polypropylene (A) satisfies conditions (1) and (2) and the melt flow rate is 0.1 to 10 g/10 minutes; and polypropylene (B) satisfies: (4) melting point is 155°C to 175°C; and (5) quantity of 20°C xylene solubles is 0.1 to 3 wt%. The polypropylene film made of the polypropylene composition preferably has a thickness of 1 500 µm. The polypropylene is preferably high density PP (HDPP) or a PP copolymer with ethylene and/or a C4-C12 α-olefin, e.g. poly(propylene-ethylen-1-butene) (89%:2%:9%).

Description

[Document Name] Specification
[Title of Invention] POLYPROPYLENE COMPOSITION, FILM THEREOF, AND
METALLIZED FILM
[Technical Field]
[0001] The present invention relates to a polypropylene composition from which a polypropylene base film, or layer, suitable for use in vapor deposition can be obtained, and a metallized polypropylene film comprising a polypropylene base film made of the polypropylene composition and a metallized layer disposed on the base film and made of a metal or a metal oxide. The film being high in bonding strength, that is! adhesion strength between the polypropylene base film and the metallized layer.
[Background Art]
[0002] Polypropylene films have been used widely in the field of packaging, and for the purpose of imparting gas barrier characteristics or light barrier characteristics to said films, there have been used metallized films in which metal or metal oxide is vapor-deposited on said films.
[0003] For example, Patent Document 1 discloses a polypropylene resin composition comprising a polypropylene containing 5% by weight or less of 2000 xylene solubles and 0.001 to 0.1 parts, based on 100 parts by weight of the polypropylene, of calcium hydroxide, the composition being capable of being used for a base film on which metal is to be vapor-deposited. Patent Document 1 also discloses an aluminum-deposited polypropylene film in which aluminum has been vapor-deposited on the base film of Patent Document 1. Patent Document 2 discloses a polypropylene for forming a base film of a metallized polypropylene film, the polypropylene having a melt flow rate of 2.0 to 15.0 gilD minutes and containing 2.5% by weight or less of components extractable in n-decane of normal temperature. Patent Document 2 also discloses a metallized polypropylene film in which a vapor-deposited film of a metal oxide has been formed on the surface of the base film of Patent Document 2. Moreover, Patent Document 3 discloses a polypropylene-based resin composition that can be used for a base film on which metal is to be vapor-deposited, the composition having an MFR of 0.1 to 20 g/min and containing 2.0% by weight or less of xylene solubles. Patent Document 3 also discloses a vapor-deposited film of a metal oxide that has been formed on a base film according to Patent Document 3.
[Prior Art Documents]
[Patent Document] [0004] [Patent Document 1] JP 2009-149753 A [Patent Document 2] JP 9-277442 A [Patent Document 3] JP 2006-52315 A
[Summary of the Invention]
[Problems to Be Solved by the Invention] [0005] However, in the metallized polypropylene films of the above-cited Patent Documents 1 to 3, the adhesion strength between a polypropylene base film and a vapor-deposited film of a metal or a metal oxide, namely, bonding strength, is not satisfactory yet.
Moreover, the appearance of the metallized layer of a metallized polypropylene film is also unsatisfactory. In producing a bag made of a metallized polypropylene film, heat sealing is conducted on a non-metallized surface of the film. Therefore, the base film to which metal is to be vapor-deposited is required to have heat resistance, but the heat resistance is not yet satisfactory.
[0006] Under such a technical background described above, an object of the present invention is to improve bonding strength between a polypropylene base film to be used for vapor-deposition of metal and a metallized layer to be disposed on the base film.
Since the appearance of a metallized layer of a metallized polypropylene film is related to the gloss of the polypropylene base film, another object of the present invention is to improve the appearance of the metallized layer by improving the gloss of the base film, and still another object of some embodiments of the invention is to improve the heat resistance of the polypropylene base film. Still another object of the present invention is to provide a polypropylene composition from which the above-mentioned polypropylene base film can be obtained, and a metallized polypropylene film comprising the above-mentioned polypropylene base film and a metallzed layer disposed on the base film and made of a metal or a metal oxide.
[0007] As a result of earnest investigations, the present inventors found that the present invention could solve the problem and have accomplished the present invention.
[0008] In a first aspect, the present invention relates to a metallized polypropylene film comprising a polypropylene layer comprising a polypropylene (A) satisfying Requirements (1), (2), and (3) described below, and a metallized layer disposed on the polypropylene layer and made of a metal or a metal oxide, Requirement (1): the melting point measured at a temperature ramp-up rate of 5 °C/minute by using a differential scanning calorimeter is 115°C to 130°C, Requirement (2): the quantity of 20°C xylene solubles is more than 5.5% by weight but not more than 10% by weight, where the overall weight of the polypropylene is taken as 100% by weight, Requirement (3): the melt flow rate measured at 230°C and 21.18 N is 0.1 gIl 0 minutes to 20 gIlO minutes.
[0009] In embodiments of the aspect, the invention makes use of a polypropylene composition that satisfies at least Requirements (1), (2), and (3), as described above.
[0010] In a second aspect, the present invention also relates to a polypropylene composition comprising 70 parts by weight to 99 parts by weight of a polypropylene (A) satisfying Requirements (1), (2), and (3) described below, and 1 part by weight to 30 parts by weight of a polypropylene (B) satisfying Requirements (4) and (5) described below, where the sum total of the weight of the polypropylene (A) and the weight of the polypropylene (B) is taken as 100 parts by weight, Requirements of the polypropylene (A): Requirement (1): the melting point measured at a temperature ramp-up rate of 5 °C/minute by using a differential scanning calorimeter is 115°C to 130°C, Requirement (2): the quantity of 20°C xylene solubles is 5.5% by weight to 10% by weight, where the overall weight of the polypropylene (A) is taken as 100% by weight, Requirement (3): the melt flow rate measured at 230°C is 0.1 gIlO minutes to 10 g/10 minutes, Requirements of the polypropylene (B): Requirement (4): the melting point is 155°C to 175°C, Requirement (5): the quantity of 20°C xylene solubles is 0.1% by weight to 3% by weight, where the overall weight of the polypropylene (B) is taken as 100% by weight, [0011] In further embodiments of the invention, the present invention relates to a polypropylene film made of using the polypropylene composition of the second aspect of the present invention, and a metallized polypropylene film comprising the polypropylene film and a metallized layer disposed on the film and made of a metal or a metal oxide.
Aspects and embodiments of the invention are also set out in claims 1 to 30 below.
[Advantageous Effects of the Invention] [0012] According to the present invention, there can be obtained a polypropylene base film for use in the vapor deposition of a metal or metal oxide, the base film being superior in bonding strength with a metallized layer to be disposed on the base film and also superior in gloss and heat resistance, a polypropylene composition capable of affording the base film, and a metallized polypropylene film comprising the base film and a metallized layer disposed on the base film and made of a metal or a metal oxide.
[Mode for carrying out the invention]
[0013] The polypropylene (A) to be used in the present invention includes propylene copolymers comprising structural units derived from at least one sort of olefin selected from among ethylene and a-olef ins having 4 to 12 carbon atoms and structural units derived from propylene. Examples of the propylene copolymers include propylene-ethylene random copolymers, propylene-rx-olef in random copolymers, and propylene-ethylene-a-olefin random copolymers.
[0014]The polypropylene (B) to be used in the present invention includes propylene homopolymers composed of structural units derived from propylene, and propylene copolymers comprising structural units derived from at least one sort of olefin selected from among ethylene and rx-olefins having 4 to 12 carbon atoms and structural units derived from propylene. Examples of the propylene copolymers include propylene-ethylene random copolymers, propylene-a-olef in random copolymers, and propylene-ethylene-a-olefin random copolymers.
[0015] Examples of the cz-olefin having 4 to 12 carbon atoms include 1-butene, 2-methyl-i -propene, 1 -pentene, 2-methyl-i -butene, 3-methyl-i -butene, 1 -hexene, 2-ethyl-i -butene, 2,3-dimethyl-i -butene, 2-methyl-i -pentene, 3-methyl-i -pentene, 4-methyl-i -pentene, 3,3-dimethyl-i -butene, 1 -heptene, methyl-i -hexene, dimethyl-i -pentene, ethyl-i -pentene, trimethyl-i -butene, methylethyl-i -butene, i -octene, methyl-i -pentene, ethyl-i -hexene, dimethyl-i -hexene, propyl-i -heptene, methylethyl-i -heptene, trimethyl-1 -pentene, propyl-i -pentene, diethyl-i -butene, i -nonene, 1 -decene, i -undecene, and i -dodecene. i -Butene, i -pentene, 1 -hexene, and i-octene are preferable, and 1-butene is more preferable in terms of its good copolymerizability and availability at a low price.
[00Th] Examples of the propylene-rx-olefin random copolymer include a propylene-i -butene random copolymer and a propylene-i -hexene random copolymer, and a propylene-i -butene random copolymer is preferable.
[00i7] Examples of the propylene-ethylene-cz-olefin random copolymer include a propylene-ethylene-i-butene random copolymer and a propylene-ethylene-i-hexene random copolymer, and a propylene-ethylene-i-butene random copolymer is preferable.
[00Th] Preferred as the polypropylene (A) are a propylene-ethylene random copolymer, a propylene-x-olefin random copolymer, and a propylene-ethylene-a-olefin terpolymer, and more preferred is a propylene-ethylene-a-olefin terpolymer.
[00Th] The content of the structural units derived from ethylene contained in the polypropylene (A) is usually 1% by weight to 10% by weight, preferably 1% by weight to 5% by weight, and more preferably 1.5% by weight to 3% by weight. When the polypropylene (A) is a propylene-ethylene random copolymer, the sum total of the content of the structural units derived from propylene and the content of the structural units derived from ethylene is taken as 100% by weight, whereas when the polypropylene (A) is a propylene-ethylene-cx-olefin terpolymer, the sum total of the content of the structural units derived from propylene, the content of the structural units derived from ethylene, and the content of the structural unit derived from the a-olefin is taken as 100% by weight.
[0020] The content of the structural units derived from the x-olefin having 4 to 12 carbon atoms contained in the polypropylene (A) is usually 1% by weight to 20% by weight, preferably 5% by weight to 15% by weight, and more preferably 8% by weight to 12% by weight. When the polypropylene (A) is a propylene-cx-olefin random copolymer, the sum total of the content of the structural units derived from propylene and the content of the structural units derived from the a-olelin having 4 to 12 carbon atoms is taken as 100% by weight, whereas when the polypropylene (A) is a propylene-ethylene-cz-olefin terpolymer, the sum total of the content of the structural units derived from propylene, the content of the structural units derived from ethylene, and the content of the structural unit derived from the a-olefin having 4 to 12 carbon atoms is taken as 100% by weight.
[0021] The melting point of the polypropylene (A), which is a melting point measured at a temperature ramp-up rate of 5°C/minute by using a differential scanning calorimeter, is 115°C to 130°C (Requirement (1)), and from the viewpoint of enhancing bonding strength, it is preferably 120°C to 130°C.
[0022] The quantity of 20°C xylene solubles of the polypropylene (A) is 5.5% by weight to 10% by weight (e.g. more than 5.5% by weight but not more than 10% by weight), where the overall weight a! the polypropylene (A) is taken as 100% by weight (Requirement (2)). More particularly, from the viewpoint of enhancing the bonding strength between a polypropylene base film to be used for vapor-deposition of metal and a metallized layer to be disposed on the base film the quantity of 20°C xylene solubles is preferably 6% by weight to 9% by weight), where the overall weight of the polypropylene (A) is taken as 100% by weight. In addition, the same parameters may be used to improve the film formability in processing a polypropylene compositon into a film when the polypropylene composition contains both polypropylene (A) and polypropylene (B). [0023]The melt flow rate (henceforth, MFR) of the polypropylene (A), which is an MFR measured at 230°C and 21.18 N, is 0.1 g/10 minutes to 20 g/1O minutes (Requirement (3)), and from the viewpoint of improving flowability or film formability, it is preferably 1 gIlO minutes to 10 g/10 minutes.
[0024] The melting point of the polypropylene (B) is 155°C to 175°C (Requirement (4)), and from the viewpoint of enhancing heat resistance, it is preferably 160°C to 175°C.
[0025] The quantity of 20°C xylene solubles of the polypropylene (B) is 0.1% by weight to 3% by weight, where the overall weight of the polypropylene (B) is taken as 100% by weight (Requirement (5)), and from the viewpoint of enhancing heat resistance, it is preferably 0.3% by weight to 2% by weight.
[0026] From the viewpoint of improving flowability or film formability, the MFR of the polypropylene (B) measured at 230°C is usually 0.1 quO minutes to 200 g/1O minutes, preferably 1 g/1O minutes to 150 g/1O minutes.
[0027] Preferred as the polypropylene (B) is a propylene homopolymer and the polypropylene (B) to be used for the present invention is preferably a polypropylene homopolymer, but the polypropylene (B) may contain structural units derived from ethylene or structural units derived from an cz-olefin so long as the melting point becomes 155°C or higher.
[0028] The polypropylenes (A) and (B) to be used for the present invention are produced by a conventional polymerization method using a conventional catalyst.
Examples of the conventional catalyst include (1) a catalyst comprising a solid catalyst component obtained by reacting a magnesium compound with a titanium compound, and an organoaluminum compound, (2) a catalyst comprising a solid catalyst
S
component obtained by reacting a magnesium compound with a titanium compound, an organoaluminum compound, and a third component such as an electron donating compound, and (3) a metallocene based catalyst. Preferred is the above-mentioned (2), specfically, a catalyst comprising a solid catalyst component comprising magnesium, titanium, and halogen as essential components, an organoaluminum compound, and an electron donating compound, and examples of this type of catalyst include the catalysts disclosed in JP 61-218606 A, JP 61-287904 A, or JP 7-216017 A. [0029] Examples of the conventional polymerization method include slurry polymerization and solvent polymerization each using an inactive hydrocarbon solvent, liquid phase polymerization using a monomer as a solvent without using any inactive hydrocarbon solvent, gas phase polymerization, or liquid phase-gas phase polymerization in which liquid phase polymerization and gas phase polymerization are conducted continuously. Gas phase polymerization is preferable. In the production of the polypropylene, a polypropylene formed as a result of polymerization may be heated under reduced pressure at a temperature lower than the temperature at which the polypropylene melts, in order to remove the remaining solvent, oligomers generated as by-products during the production. Examples of the method of heating under reduced pressure include the methods of drying under reduced pressure disclosed in JP 55-75410 A and JP 2-80433 A. [0030] In relation to the metallized film comprising polypropylene (A) in a polypropylene layer, the polypropylene layer may further comprise a high density polyethylene. For example, the polypropylene layer may 90 parts by weight to 99.9 parts by weight of polypropylene (A) and 0.1 parts by weight to 10 parts by weight of the high density polyethylene, where the total of the weights of polypropylene (A) and the high density polyethylene is taken as 100 parts by weight, and preferably 93 parts by weight to 99 parts by weight of polypropylene (A) and 1 part by weight to 7 parts by weight of the high density polyethylene.
[0031] When the polypropylene composition and metallized film comprises polypropylenes (A) and (B), the amount of the polypropylene (A) is 70 parts by weight to 99 parts by weight and the content of the polypropylene (B) is 1 part by weight to 30 parts by weight, where the sum total of the weights of the polypropylene (A) and the polypropylene (B) is taken as 100 parts by weight, and from the viewpoint of enhancing heat resistance and bonding strength, the content of the polypropylene (A) is preferably 80 parts by weight to 99 parts by weight and the content of the polypropylene (B) is preferably 1 part by weight to 20 parts by weight.
[0032] When the polypropylene composition and metallized film comprises polypropylenes (A) and (B), the polypropylene composition and/or layer may further comprise a high density polyethylene. For example, the polypropylene resin composition and/or the polypropylene layer of the metallized film comprising polypropylene (A) and (B) may comprise 60 to 98.9 parts by weight of polypropylene (A), 1 to 30 parts by weight of polypropylene (B), and 0.1 to 10 parts by weight of a high density polyethylene, where the sum total of the weights of the polypropylene (A), the polypropylene (B), and the high density polyethylene is taken as 100 parts by weight.
[0033] When used herein, the density of the high density polyethylene is 0.93 g/cm3 to 0.98 glcm3, preferably 0.95 cm3 to 0.97 glcm3.
[0034] When used herein, the MFR of the high density polyethylene at 190°C is usually 1 g/10 minutes to 100 g/10 minutes, preferably 1 g/10 minutes to 50 9/10 minutes.
[0035] To any of the components (e.g. the polypropylenes (A) and (B) or the high density polyethylene), or to any of the the resin compositions (e.g. a blend of polypropylene (A) and a high density polyethylene or a blend of polypropylenes (A) and (B) and a high density polyethylene) may be added an additive or an additional resin, as required. As will be appreciated, the resulting compositions are to be contained in the polypropylene layer to be used for the present invention. Examples of the additives include antioxidants, UV absorbers, antistatic agents, lubricants, nucleating agents, anticlouding agents, antiblocking agents, and metal deactivators.
[0036] Antioxidants are compounds which have an action to prevent the polypropylene layer of the metallized polypropylene film of the present invention, or the polypropylene or the high density polyethylene contained in the polypropylene layer from being decomposed by heat, light, oxygen, or the like. Examples thereof include phenolic antioxidants, phosphorus-containing antioxidants, sulfur-containing antioxidants, and hydroxylamine-based antioxidants, and preferable are phenolic antioxidants, phosphorus-containing antioxidants, and sulfur-containing antioxidants.
[0037] Examples of the phenolic antioxidants include 2,6-di-tert-butyl-4-methylphenol, tetrakis[methylene-3-(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate] methane, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, 3,9-bis[2-{3-(3-tert-butyl-4-hydroxy-5-methylphenypropionyloxy}-1, 1 -dimethylethyl]-2,4 8,1 0-tetraoxaspiro[5.5]undecane, 1,3,5-tris-2[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxy] ethylisocyanate, 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene, tris(3,5-di-tert-butyl-4-hydroxybenzyisocyanu rate, 1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethybenzyl)isocyanurate, pentaerythrityl-tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], triethylene glycol-N-bis-3-(3-tert-butyl-5-methyl-4-hydrcxyphenyl)propionate, 1,6-hexanediol bis[(3-(3,5-di-tert-butyl-4-hydroxyphenypropionate)], 2,2-thiobis-diethylenebis[(3-(3,5-di-tert-butyl-4-hydroxyphenypropionate)] , 2,2'-methylene-bis-(4-methyl-6-tert-butylphenol), 2,2'-methylene-bis-(4-ethyl-6-tert-butylphenol), 2,2'-methylene-bis-(4,6-di-tert-butylphenol), 2,2-ethylidene-bis-(4,6-di-tert-butylphenol), 2,2'-butylidene-bis-(4-methyl-6-tert-butylphenol), 4,4'-butylidenebis(3-methyl-6-tert-butylphenol), 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzy-4-methylphenyl acrylate, and 2,4-di-tert-amyl-6-(1 -(3,5-di-tert-amyl-2-hydroxyphenyethyphenyl acrylate.
[0038] Further examples include tocopherols, especially, vitamin E, which is cz-tocoph era I. [0039] Preferable are 2,6-di-tert-butyl-4-methylphenol, tetrakis[methylene-3(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate] methane, 2,6-di-tert-butyl-4-methylphenol, octadecyl-3-(3,5-di-tert-butyl-4-hydraxyphenypropionate, 3,9-bis[2-{3-(3-tert-butyl-4-hydroxy-5-methylphenypropionyloxy}-1, 1 -dimethyl ethyl]-2,4,8,1 0-tetraoxaspiro[5*5]undecane, tris(3,5-di-tert-butyl-4-hydroxybenzyisocyanurate, and vitamin E, and more preferable are tetrakis[methylene-3(3',5'-di-tert-butyl-4-hydroxyphenyl)propionate] methane, octadecyl-3-(3,5-di-tert-butyl-4-hydraxyphenypropionate, and vitamin E. [0040] The content of a phenolic antioxidant is generally 0.01 parts by weight to 2 parts by weight, preferably 0.01 parts by weight to 1 part by weight, and more preferably 0.01 parts by weight to 0.5 parts by weight per 100 parts by weight of the polypropylene.
[0041] Examples of the phosphorus-containing antioxidants include tris(nonylphenyl) phosphite, tris(2,4-di-tert-butylphenyl) phosphite, distearyl pentaerythritol diphosphite, bis (2,4-d i -tert-butyl phenyl) pentaeryth rita I d iph asph ite, bis(2,4-di-tert-butyl-6-methylphenyl) pentaerythritol diphosphite, bis(2,6-di-tert-butyl-4-methylphenyl) pentaerythritol diphosphite, bis(2,4-dicumylphenyl) pentaerythritol diphosphite, tetrakis(2,4-di-tert-butylphenyl)-4,4'-diphenylene diphosphonite, 2,2'-methylenebis(4,6-di-tert-butylphenyl) 2-ethyihexyiphosphite, 2,2'-ethylidenebis(4,6-di-tert-butylphenyl) fluorophosphite, bis(2,4-di-tert-butyl-6-methylphenyl)ethylphosphite, 2-(2,4,6-tri-tert-butylphenyfl-5-ethyl-5-butyl-1,3,2-oxaphosphorinane, 2,2',2'-nitrilo[triethyltris(3,3',5,5'-tetra-tert-butyl-1,1 -biphenyl-2,2'-diyl) phosphite, and 2,4,8,1 0-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxy-5-tert-butylphenyl)propoxy] dibenzo[d,f ][1,3,2]dioxaphosphepin. Preferable are tris(2,4-di-tert-butylphenyl) phosphite and 2,4,8,1 0-tetra-tert-butyl-6-[3-(3-methyl-4-hydroxy-5-tert-butylphenyl)propoxy] dibenzo[d,f ][1,3,2]dioxaphosphepin.
[0042] The loading of a phosphorus-containing antioxidant is generally 0.01 parts by weight to 2 parts by weight, preferably 0.01 parts by weight to 1 part by weight, and more preferably 0.01 parts by weight to 0.5 parts by weight per 100 parts by weight of the polypropylene.
[0043] Examples of the sulfur-containing antioxidant include dilauryl 3,3'-thiodipropionate, tridecyl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, distearyl 3,3'-thiodipropionate, lauryl stearyl 3,3'-thiodipropionate, neopentanetetrayltetrakis(3-laurylthiopropionate), bis[2-metbyl-4-(3-dodecylthiopropionyloxy)-5-tert-butylphenyl]sulfide, bis[2-metbyl-4-(3-tridecylthiopropionyloxy)-5-tert-butylphenyl]sulfide, and bis[2-metbyl-4-(3-tetradecylthiopropionyloxy)-5-tert-butylphenyl]sulfide. Preferable are dilauryl 3,3'-thiodipropionate, dimyristyl 3,3'-thiodipropionate, and distearyl 3,3'-thiodipropionate.
[0044] The loading of a sulfur-containing antioxidant is generally 0.01 parts by weight to 2 parts by weight perlOO parts by weight of the polypropylene. The loading is preferably 0.01 parts by weight to 1 part by weight, and more preferably 0.01 parts by weight to 0.5 parts by weight.
[0045] The additional resin is a resin other than the polypropylene (A), the polypropylene resin (B), and the high density polyethylene of the present invention and examples thereof include olefin-based resins such as low density polyethylene and polybutene, and copolymer elastomers made from ethylene and an cz-olefin; these may be either products produced using homogeneous catalysts or products produced using heterogeneous catalysts, such as metallocene based catalysts. Further examples include styrene-based copolymer rubbers produced by hydrogenating styrene-butadiene-styrene copolymers or styrene-isoprene-styrene copolymers.
[0046] The method for producing the polypropylene composition of the present invention comprising polypropylene (A), and a high density polyethylene may be a method involving melt-kneading the polypropylene (A) and the high density polyethylene by using a single screw extruder or a twin screw extruder.
[0047]The method for producing the polypropylene composition of the present invention comprising polypropylene (A) and polypropylene (B) may be a method involving melt-kneading the polypropylene (A) and the polypropylene (B) by using a single screw extruder or a twin screw extruder. The method for producing the polypropylene composition of the present invention comprising polypropylene (A), polypropylene (B), and a high density polyethylene may be a method involving melt-kneading the polypropylene (A), the polypropylene (B), and the high density polyethylene by using a single screw extruder or a twin screw extruder. The polypropylene (A), the polypropylene (B), and the high density polyethylene may be melt-kneaded at once, or in an alternative possible embodiment, any two polymers of these are melt-kneaded and then the other one is added, followed by melt-kneading.
[0048] When the polypropylene composition of the present invention contains an additive or an additional resin, it is permitted to melt-knead the polypropylene (A), the polypropylene (B), or the high density polyethylene and the additive or the additional resin by using a single screw extruder or a twin screw extruder. In another possible embodiment, any two polymers of the polypropylene (A), the polypropylene (B), and the high density polyethylene are melt-kneaded and then further melt-kneaded together with an additive or an additional resin, and in still another possible embodiment, these polymers are melt-kneaded at once and then further melt-kneaded together with an additive or an additional resin.
[0049] For example, in the event that polypropylene (A), polypropylene (B) or the high density polyethylene contains an additive or another resin, there can be employed a method involving melt-kneading polypropylene (A) or (B) and such an additive or such an additional resin by using a single screw extruder or a twin screw extruder, a method involving melt-kneading the high density polyethylene and such an additive or such an additional resin, and a method involving melt-kneading polypropylene (A) and/or (B) and the high density polyethylene together with such an additive or such an additional resin.
These methods also apply by analogy to the preparation of a composition comprising polypropylene (A) and a high density polyethylene, where at least one of said components contains an additive or another resin.
[0050] The temperature of a melt-kneaded matter when melt-kneading is usually 180°C to 300°C, preferably 190°C to 280°C.
[0051] A polypropylene film made of the polypropylene compositions disclosed herein is a polypropylene base film that is to be used for a metallized polypropylene film and to which a metal or a metal oxide is to be vapor-deposited. The base film can be produced by a method that involves forming the polypropylene compositions described herein into a film by using a conventional film forming method such as a blown film forming method, a T-die method, and a calendering method.
[0052] The base film may have been drawn. A drawn base film can be produced by drawing a film or a sheet prepared by forming a resin composition as described herein.
Examples of methods for the drawing include methods involving uniaxially or biaxially drawing films by a roll drawing process, a tenter drawing process, a tubular drawing process, or the like. Before the vapor-deposition of a metal or a metal oxide, surface treatment, such as corona discharge treatment, plasma treatment, and flame treatment, may be applied to the base film on its surface on which a metal or a metal oxide is to be vapor-deposited. Corona treatment is preferred.
[0053] The thickness of the base film and the thickness of the polypropylene layer in the metallized film of the present invention are 1 j.m to 500 pm, more preferably 5pm to tm.
[0054] The metallized film of the present invention is a metallized film comprising a polypropylene layer and a metallized layer. Said metallized layer is a deposited layer containing a metal element and is a layer formed by vapor deposition of a metal or a metal oxide on said polypropylene layer. Therefore, the metallized layer is composed of a metal or a metal oxide. The polypropylene layer may have said metallized layer only on one side thereof or alternatively may have said metallized layer on both sides.
[0055] The metallized film of the present invention can be produced by vapor-depositing a metal or a metal oxide onto a base film made of a polypropylene that satisfies the above-mentioned Requirements (1), (2), and (3), if the polypropylene layer only comprises polypropylene (A) or satisfies the above-mentioned Requirements (1), (2), (3), (4) and (5), if the polypropylene comprises both polypropylene (A) and polypropylene (B).
[0056]The method for vapor-depositing a metal or a metal oxide may be, for example, a method in which a base film made of the polypropylene composition of the present invention is placed under a high vacuum, and metal vapor or metal oxide vapor is introduced and thereby a metal or a metal oxide is deposited onto the surface of the base film.
[0057] Examples of the metal to vapor-deposit include aluminum, titanium, chromium, nickel, copper, germanium, tin, and selenium, and examples of the metal oxide include silica and aluminum oxide. Preferable is aluminum, silica, or aluminum oxide.
[0058] The thickness of the metallized layer is usually 100 A to 1000 A, preferably 300 A to 700 A. [0059] In one embodiment, the metallized film of the present invention may be a metallized film that further comprises a substrate layer in addition to said polypropylene layer and said metallized layer. In the metallized film of this embodiment, the substrate layer has been disposed on a side of the polypropylene layer opposite from the side on which the metallized layer has been formed. The metallized film of this embodiment can be produced by vapor-depositing a metal or a metal oxide onto an exposed surface of a base film composed of a polypropylene layer and a substrate layer laminated together.
The method for depositing a metal or a metal oxide may be the above-described one.
[0060] Said base film in which a polypropylene layer and a substrate layer are laminated together and this composite layer can be produced by applying any commonly known method for producing a multilayer body. For example, when the substrate layer is made of a resin, there car be used a method involving layering a melt of the polypropylene compositions described herein and a melt of the resin to be used for the substrate layer by using a co-extrusion process, or a method involving laminating a film prepared by forming the polypropylene compositions as described herein and a film prepared by forming the resin to be used for the substrate layer by an extrusion laminating process, a heat laminating process, or a dry laminating process.
[0061] Said laminated base film to be used for the production of a metallized film of this embodiment may have been drawn by the aforementioned drawing method.
[0062] Before the vapor-deposition of a metal or a metal oxide, surface treatment, such as corona discharge treatment, plasma treatment, and flame treatment, may be applied to the layered base film on its exposed surface of the polypropylene film on which surface a metallized layer is to be formed by vapor-depositing a metal or a metal oxide. Corona treatment is preferred.
[0063] In a metallized polypropylene film using the aforementioned layered base film, the thickness of the polypropylene film is 1 tm to 500 pm, preferably 3 j.m to 100 Mm.
When present, the thickness of the substrate layer is 5 m to 500 m, and preferably 5 m to 100 Mm. The thickness of the metallized layer is usually 100 A to 1000 A, preferably 300 A to 700 A.
[EXAMPLES]
[0064] The present invention is illustrated by the following Examples and Comparative Examples. The measured values of the respective items in the detailed description of the invention, the Examples, and the Comparative Examples were measured by the methods described below.
[0065] (1) The content of structural units derived from ethylene contained in polypropylene and the content of structural units derived from 1-butene (unit: % by weight, where the whole weight of the polypropylene is taken as 100% by weight) The content of structural units derived from ethylene was determined in accordance with the method relating to (i) random copolymers described in Macromolecule Handbook, page 616 (published by Kinokuniya Co., Ltd., 1995) after IR spectrum measurement. The content of structural units derived from 1-butene was determined in accordance with the method relating to (i) random copolymers described in Macromolecule Handbook, page 619 (published by Kinokuniya Co., Ltd., 1995) after IR spectrum measurement.
[0066] (2) Melting Temperature (Tm, unit: 00) Using a differential scanning calorimeter (Diamond DSC manufactured by PerkinElmer, Inc.), a specimen of about 10mg was heated under nitrogen atmosphere up to 220°C at a temperature ramp-up rate of 220°C/mm, holding the sample at 220°C for 5 minutes, thereby melting it, and then cooling it down to 87°C at a temperature ramp-down rate of 200°C/mm. After holding at 87°C for 5 minutes, the temperature was raised up to 220°C at a temperature ramp-up rate of 5°C/mm and a fusion endothermic curve was produced. The temperature of the maximum peak of the fusion endothermic curve was defined as a melting temperature (henceforth indicated by Tm).
The melting point of indium (In) measured at a temperature ramp-up rate of 5°C using this measurement method was 156.6°C.
[0067] (3) Melt flow rate (MFR; unit: g/10 mm) The MFR of a polypropylene was measured by at a temperature of 230°C and a load of 21.18 N in accordance with JIS K7210.
[0068] (4) The content of components soluble in 20°C xylene (CXS, unit: % by weight) A sample of 0.5 g was dissolved completely in 50 niL of boiling xylene, and then cooled to room temperature and left at rest for 30 minutes and then cooled to 20°C for 90 minutes. Subsequently, the resultant was separated into precipitates and a solution by filtration, and the filtrate was dried up at 70°C under reduced pressure, affording a residue. The residue was weighed and then the content of components soluble in 20°C xylene (henceforth called CXS) was calculated.
[0069] (5) Gloss (unit: %) Gloss was measured in accordance with JIS K7105.
[0070] (7) Heat resistance The shrinkages of a polypropylene film in the longitudinal direction (MD) and the transverse direction (ID) were measured by measuring the original MD and TD of the polypropylene film and then placing the film in an oven heated to 155°C for 10 minutes and measuring the MD and ID again. The difference between the original vales of the MD and TD determines the skrinkage of the polypropylene film [Okay?].
Smaller shrinkage indicates better heat resistance.
[0071] (7) Bonding strength (unit: N/iS mm) An undrawn film on which a metal was vapor-deposited was heat-sealed on its metal-deposited surface with an ethylene-vinyl acetate copolymer (EVA) film of 50 tm in thickness at a temperature of 125°C and a pressure of 2kg/cm2 for 2 seconds. In the heat-sealing, cellophane was inserted to between the EVA film and a sealing bar in order to prevent the EVA film from sticking to the sealing bar. After the heat-sealing, the resulting laminate was pressed 10 times with a roller of 2 kg in order to secure sufficient adhesion strength between the EVA film and the metal-deposited surface.
The resulting laminate film was conditioned at 110°C for 2 hours, and then a sample of mm in width and 70 mm in length was prepared with the film forming direction being matched with the shorter side direction, and then a tensile test was conducted at a tensile rate of 100 mm/mm and a peeling distance of 30 mm by using an Instron Model 5567 Autograph. The tensile load at the time of peeling was defined as bonding strength.
[0072]
[Example 1]
<Polypropylene pellets> Ninety-six parts by weight of crystalline polypropylene Al (a propylene-ethylene-1-butene terpolymer; the ethylene content: 2.0% by weight, the 1-butene content: 9.0% by weight, the melting temperature: 127°C, CXS: 7.0% by weight), 4 parts by weight of a high density polyethylene (Density=0.955g/cm3 MFR=16 g/lomin, produced by Keiyo Polyethylene Co., Ltd.), the combination of polypropylene Al and the high density polyethylene is takes as being 100 parts by weight of the total polymer content, 0.1 parts by weight of hydrotalcite DHT-4C (produced by Kyowa Chemical Industry Co., Ltd.), 0.10 parts by weight of Irganox 1010 (produced by Ciba Specialty Chemicals), 0.05 parts by weight of Irgafos 168 (produced by Ciba Specialty Chemicals), and 0.25 parts by weight of aluminosilicate JC4O (produced by Mizusawa Industrial Chemicals, Ltd.) were added and melt-kneaded, affording pellets having an MFF1of 5.0 g/10 mm.
[0073] <Film to be used as a polypropylene layer of a metallized film> The resulting pellets of polypropylene were melt-extruded at a resin temperature of 240°C by using a 40 mm T die film-forming apparatus (manufactured by Modern Machinery Co., MCAG4O/400 type film-forming apparatus, with a 400 mm wide T die). The melt-extruded resin was cooled on a chill roll in which 50°C cooling water was circulated, affording a film 30 tm in thickness to be used as a polypropylene layer of a metallized film. Using a corona-treater attached to said apparatus, corona treatment was applied to a surface to which metal was to be vapor deposited.
[0074] <Aluminum-deposited polypropylene film> Using a vacuum deposition apparatus (DSC-500A, manufactured by Daehan Vacuum Engineering), aluminum was vapor-deposited to the above-obtained film on its corona-treated surface, affording an aluminum-deposited polypropylene film. The wetting tension just before the aluminum vapor deposition was 40 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the gloss of the film before the vapor deposition are given in Table 1.
[0075]
[Example 2]
Pellets of a polypropylene composition having an MFR of 4.8 g/l0 minutes were obtained by conducting melt-kneading in the same way as in Example 1 except for changing the content of polypropylene Al to 97 parts by weight and the content of high density polyethylene to 3 parts by weight. An aluminum-deposited polypropylene film was obtained by conducting the formation of a film to be used as a base film and the vapor deposition of aluminum to the base film in the same ways as in Exampe 1. The wetting tension just before the aluminum vapor deposition was 41 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the gloss are given in Table 1, while the bonding strength, the shrinkage and the gloss of the film before the vapor deposition are given in Table 2.
[0076][Comparative Example 1] Pellets having an MFR of 6.7 gIl 0 minutes were obtained in the same contents as the contents used in Example 1 except for changing the polypropylene Al used in Example ito polypropylene 2 (a propylene-ethylene-i -butene terpolymer; the ethylene content: 0.8% by weight, the 1-butene content: 9.1% by weight, the melting temperature: 137°C, CXS: 1.4% by weight) by melt-kneading the polypropylene 2, the high density polyethylene, and the other additives. The film to be used as a polypropylene layer and the aluminum-deposited polypropylene film were also produced in the same way as in Example 1. The wetting tension just before the aluminum vapor deposition was 40 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the gloss of the film before the vapor deposition are given in Table 1.
[0077] [Comparative Example 2] Pellets having an MFR of 7.4 gIl 0 minutes were obtained in the same contents as the contents used in Example 1 except for changing the polypropylene Al used in Example ito polypropylene 3 (a propylene-ethylene-i -butene terpolymer; the ethylene content: 0.9% by weight, the 1-butene content: 3.9% by weight, the melting temperature: 144°C, CXS: 1.0% by weight) by melt-kneading the polypropylene 3, the high density polyethylene, and the other additives. The film to be used as a polypropylene layer and the aluminum-deposited polypropylene film were also produced in the same way as in Example 1. The wetting tension just before the aluminum vapor deposition was 40 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the gloss of the film before the vapor deposition are given in Table 1.
[0078] [Comparative Example 3] Pellets having an MFR of 7.0 g/1 0 minutes were obtained in the same contents as the contents used in Example 1 except for changing the polypropylene 1 used in Example 1 to polypropylene 4 (a propylene-ethylene copolymer; the ethylene content: 2.7% by weight, the melting temperature: 141°C, CXS: 2.6% by weight) by melt-kneading the polypropylene 4, the high density polyethylene, and the other additives. The film to be used as a polypropylene layer and the aluminum-deposited polypropylene film were also produced in the same way as in Example 1. The wetting tension just before the aluminum vapor deposition was 40 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the gloss of the film before the vapor deposition are given in Table 1.
[0079]
[Table 1] Gloss
Bonding strength (before vapor deposition) (N/15 mm) (%)
Example 1 >1 153
Example 2 >1 153
Comparative Example 1 0.39 149 Comparative Example 2 0.27 149 Comparative ExampleS 0.36 150 [0080] The metallized film of Example 1, which satisfies the requirements of the present invention, is found to be superior in bonding strength, that is, adhesion between a polypropylene layer and a metallized layer. In contrast, it has also been shown that Comparative Examples 1 to 3, which fail to satisfy the requirements of the present invention, are inferior in bonding strength.
[0081] The gloss of each of the films before given in Table 1 is a value for evaluating the appearance of a metallized film indicates that a metallized film prepared by vapor-depositing a metal or a metal oxide onto a film that is a polypropylene layer satisfying the requirements of the present invention has good appearance.
[0082]
[Example 3]
<Pellet of polypropylene composition> Ninety-two parts by weight of polypropylene Al (a propylene-ethylene-i -butene terpolymer; the ethylene content: 2.0% by weight, the 1 -butene content: 9.0% by weight, Tm: 127°C, CXS: 7.0% by weight, MFR: 5.0 gilD minutes), 5 parts by weight of polypropylene B1 (a propylene homopolymer; Tm: 168°C, CXS: 0.9% by weight, MFR: 7.0 g/1O minutes), 3 parts by weight of a highi density polyethylene (Density=O.955g/cm3 MFR=16 g/lOmin, produced by Keiyo Polyethylene Co., Ltd.), as well as per 100 parts by weight of polypropylene Al, polypropylene B1 and the high density polyethylene in total, 0.01 parts by weight of hydrotalcite DHT-4C (produced by Kyowa Chemical Industry Co., Ltd.), 0.10 parts by weight of Irganox 1010 (produced by Ciba Specialty Chemicals), 0.05 parts by weight of Irgafos 168 (produced by Ciba Specialty Chemicals), and 0.25 parts by weight of alurninosilicate JC4O (produced by Mizusawa Industrial Chemicals, Ltd.) were added and melt-kneaded, affording pellets having an MFR of 5.0 gIlO mm.
[0083] <Film to be used as a base film of a metallized film> The resulting pellets of the polypropylene composition were melt-extruded at a resin temperature of 240°C by using a 40 mm T die film-forming apparatus (manufactured by Modern Machinery Co., MCAG4O/400 type film-forming apparatus, with a 400mm wide T die). The melt-extruded resin was cooled on a chill roll in which 50°C cooling water was circulated, affording a polypropylene film 30 tIm in thickness to be used as a base film of a metallized film. Using a corona-treater attached to said apparatus, corona treatment was applied to a surface to which metal was to be vapor-deposited.
[0084] <Aluminum-deposited polypropylene film> Using a vacuum deposition apparatus (DSC-500A, manufactured by Daehan Vacuum Engineering), aluminum was vapor-deposited to the corona treated surface of a film, affording an aluminum-deposited polypropylene film. The wetting tension just before the aluminum vapor deposition was 41 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the shrinkage and the gloss of the film before the vapor deposition are given in Table 2.
[0085]
[Example 4]
Pellets of a polypropylene composition having an MFR of 5.3 g/l0 minutes were obtained by conducting melt-kneading in the same way as in Example 3 except for changing the content of polypropylene Al to 87 parts by weight, the content of polypropylene 91 to 10 parts by weight, and the content of high density polyethylene to 3 parts by weight. An aluminum-deposited polypropylene film was obtained by conducting the formation of a film to be used as a base film and the vapor deposition of aluminum to the base film in the same ways as in Example 3. The wetting tension just before the aluminum vapor deposition was 40 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the shrinkage and the gloss of the film before the vapor deposition are given in Table 2.
[0086] [Comparative Example 4] Pellets of a polypropylene composition having an MFR of 7.3 g/lO minutes were obtained by conducting melt-kneading in the same way as in Example 2 except for exchanging polypropylene Al to polypropylene A2 (a propylene-ethylene-1-butene terpolymer; the content of structural units derived from ethylene: 0.8% by weight, the content of structural units derived from 1-butene: 9.1% by weight, Tm: 137°C, CXS: 1.4% by weight, MFR: 6.7 g/l0 minutes). An aluminum-deposited polypropylene film was obtained by conducting the formation of a film to be used as a base film and the vapor deposition of aluminum to the base film in the same ways as in Exampe 2. The wetting tension just before the aluminum vapor deposition was 40 dyne/cm. The bonding strength of the resulting aluminum-deposited polypropylene film and the shrinkage and the gloss of the film before the vapor deposition are given in Table 2.
[0087]
[Table 2]
Shrinkage Bonding Gloss (before vapor deposition) strength (before vapor deposition) M D/TD (N/15 mm) (%) Example 3 >1 0.9/1.2 153 Example 4 >1 0.5/0.8 152 Example2 >1 1.5/2.1 153 Comparative 0.33 -0.2/1.0 152
Example 4
[0088] Examples 3 and 4 given in Table 2 show that a metallized polypropylene film using a polypropylene composition having a blend of two polypropylene compounds that satisfy the requirements of a subset of the present invention is superior in bonding strength, namely, adhesion between a base film and a metallized layer, that the base film is superior in heat resistance, and that the metallized film has good appearance due to the gloss of the base film. In contrast to this, Example 2 shows that a base film using a polypropylene composition failing to satisfy the requirements of this particular subset a! the present invention is insufficient in heat resistance (i.e. the use of only a single polypropylene, instead of two polypropylenes), and Comparative Example 4 shows that such a base film is insufficient in bonding strength, namely, adhesion between the base film and a metallized layer.

Claims (30)

  1. Claims 1. A metallized polypropylene film comprising a polypropylene layer comprising a polypropylene (A) satisfying Requirements (1), (2), and (3), and a metallized layer disposed on the polypropylene layer, wherein the metallized layer is made of a metal or a metal oxide, Requirement (1): the melting point measured at a temperature ramp-up rate of 5 °C/minute by using a differential scanning calorimeter is 115°C to 130°C, Requirement (2): the quantity of 20°C xylene solubles is more than 5.5% by weight but not more than 10% by weight, where the overall weight of the polypropylene is taken as 100% by weight, Requirement (3): the melt flow rate measured at 23000 and 21.18 N is 0.1 gIl 0 minutes to 20 gIlO minutes, wherein the total polymer content of the polypropylene layer is taken as 100 parts by weight.
  2. 2. The metallized polypropylene film according to claim 1, wherein the polypropylene layer is a polypropylene layer comprising 90 parts by weight to 99.9 parts by weight of the polypropylene (A) and 0.1 parts by weight to 10 parts by weight of a high density polyethylene.
  3. 3. The metallized polypropylene film according to claim 1, wherein the polypropylene layer comprises 65 parts by weight to 99 parts by weight of polypropylene (A) and 1 part by weight to 35 parts by weight of polypropylene (B) satisfying Requirements (4) and (5), Requirement (4): the melting point measured at a temperature ramp-up rate of 5 °C/minute by using a differential scanning calorimeter is 155°C to 175°C, Requirement (5): the quantity of 20°C xylene solubles is 0.1% by weight to 3% by weight, where the overall weight of the polypropylene (B) is taken as 100% by weight.
  4. 4. The metallized polypropylene film according to claim 3, wherein the polypropylene layer comprises 70 parts by weight to 99 parts by weight of polypropylene (A) and 1 part by weight to 30 parts by weight of polypropylene (B).
  5. 5. The metallized polypropylene film according to claim 3, wherein the polypropylene layer comprises 60 to 98.9 parts by weight of polypropylene (A), 1 to 30 parts by weight of polypropylene (B) as described in Claim 3, and 0.1 to 10 parts by weight of a high density polyethylene.
  6. 6. The metallized polypropylene film according to any one of the preceding claims, wherein polypropylene (A) is a propylene copolymer comprising structural units derived from propylene and structural units derived from ethylene and/or one or more a-olef in having 4 to 12 carbon atoms.
  7. 7. The metallized polypropylene film according to any one of the preceding claims, wherein, polypropylene (B) is a propylene homopolymer composed of structural units derived from propylene, or a propylene copolymer comprising structural units derived from propylene and structural units derived from ethylene and/or at least one a-olef in having 4 to 12 carbon atoms.
  8. 8. The metallized polypropylene film according to claim 6 or claim 7, wherein polypropylene (A) and/or polypropylene (B) is a propylene copolymer selected from the group consisting of propylene-ethylene random copolymers, propylene-cc-olefin random copolymers, and propylene-ethylene-a-olefin random copolymers.
  9. 9. The metallized polypropylene film according to any one of claims 6 to 8, wherein, when polypropylene (A) is a propylene-ethylene random copolymer or a propylene-ethylene-a-olefin random copolymer, the structural units derved from ethylene contained in polypropylene (A) is 1% by weight to 10% by weight, wherein the total polymer content of the copolymer is taken as 100 parts by weight.
  10. 10. The metallized polypropylene film according to any one of claims 6 to 9, wherein, when polypropylene (A) is a propylene-ethylene-x-olefin random copolymer, the content of the structural units derived from the a-olefin having 4 to 12 carbon atoms contained in the polypropylene (A) is 1% by weight to 20% by weight, wherein the total polymer content of the copolymer is taken as 100 parts by weight.
  11. 11. The metallized polypropylene film according to any one of claims 6 to 9, wherein, when polypropylene (A) is a propylene-ethylene-x-olefin random copolymer, the propylene-ethylene-a-oletin random copolymer is a propylene-ethylene-i -butene copolymer.
  12. 12. The metallized polypropylene film according to Claim 11, wherein the propylene-ethylene-1-butene copolymer consists of 89 wt% of propylene, 2.0 wt% of ethylene and 9.0 wt% of 1-butene.
  13. 13. The metallized polypropylene film according to any one of claims 6, 7, and 9 to 12, wherein polypropylene (B) is a propylene homopolymer.
  14. 14. The metallized film according to any one of the preceding claims, wherein the thickness of the polypropylene layer in the metallized film is 1 pm to 500 tim.
  15. 15. The metallized film according to any one of the preceding claims, wherein the metal or metal oxide is selected from one or more of the group consisting of aluminum, titanium, chromium, nickel, copper, germanium, tin, selenium, silica and aluminum oxide.
  16. 16. The metallized film according to any one of the preceding claims, wherein the polypropylene layer has two sides and the nietallized layer is present on one face or on both sides of the polypropylene layer.
  17. 17. The metallized film according to any one of the preceding claims, wherein the thickness of the metallized layer is from 100 A to 1000 A.
  18. 18. The metallized film according to any one of the preceding claims, wherein the polypropylene layer further comprises one or more additional polymers.
  19. 19. A polypropylene composition comprising 65 parts by weight to 99 parts by weight of polypropylene (A) satisfying Requirements (1), (2), and (3) described below, and 1 part by weight to 35 parts by weight of polypropylene (B) satisfying Requirements (4) and (5) described below, Requirements of the polypropylene (A): Requirement (1): the melting point measured at a temperature ramp-up rate of 5 °C/minute by using a differential scanning calorimeter is 115°C to 130°C, Requirement (2): the quantity of 20°C xylene solubles is 5.5% by weight to 10% by weight, where the overall weight of the polypropylene (A) is taken as 100% by weight, Requirements (3): the melt flow rate measured at 230°C is 0.1 g/10 minutes to 10 g/10 minutes, Requirements of the polypropylene (B): Requirement (4): the melting point is 155°C to 175°C, Requirement (5): the quantity of 20°C xylene solubles is 0.1% by weight to 3% by weight, where the overall weight of the polypropylene (B) is taken as 100% by weight, wherein the total polymer content of the polypropylene composition is taken as parts by weight.
  20. 20. The polypropylene composition according to claim 19, wherein the polypropylene composition comprises 70 parts by weight to 99 parts by weight of polypropylene (A) and 1 part by weight to 30 parts by weight of polypropylene (B).
  21. 21. The polypropylene composition according to claim 19, wherein the composition comprises 69 to 95 parts by weight of the polypropylene (A) described in claim 1, ito 30 parts by weight of the polypropylene (B) described in claim 1, and 0.1 to 10 parts by weight of a high density polyethylene.
  22. 22. The polypropylene composition according to any one of claims 19 to 21, wherein polypropylene (A) is a propylene copolymer comprising structural units derived from propylene and structural units derived from ethylene and/or one or more rz-olef in having 4 to 12 carbon atoms.
  23. 23. The polypropylene composition according to any one of claims 19 to 22, wherein polypropylene (B) is a propylene homopolymer composed of structural units derived from propylene, or a propylene copolymer comprising structural units derived from propylene and structural units derived from ethylene and/or at least one a-olef in having 4 to 12 carbon atoms.
  24. 24. The polypropylene composition according to any one of claims 19 to 23, wherein polypropylene (A) and/or polypropylene (B) is a propylene copolymer selected from the group consisting of propylene-ethylene random copolymers, propylene-a-olefin random copolymers, and propylene-ethylene-a-olefin random copolymers.
  25. 25. The polypropylene composition according to any one of claims 22 to 24, wherein, when polypropylene (A) is a propylene-ethylene random copolymer or a propylene-ethylene-a-olefin random copolymer, the structural units derved from ethylene contained in polypropylene (A) is 1% by weight to 10% by weight, wherein the total polymer content of the copolymer is taken as 100 parts by weight.
  26. 26. The polypropylene composition according to any one of claims 22 to 25, wherein, when polypropylene (A) is a propylene-ethylene-cz-olefin random copolymer, the content of the structural units derived from the a-olefin having 4 to 12 carbon atoms contained in the polypropylene (A) is 1% by weight to 20% by weight, wherein the total polymer content of the copolymer is taken as 100 parts by weight.
  27. 27. The metallized polypropylene film according to any one of claims 22 to 26, wherein, when polypropylene (A) is a propylene-ethylene-ri-olefin random copolymer, the propylene-ethylene-a-oletin random copolymer is a propylene-ethylene-i -butene copolymer.
  28. 28. The metallized polypropylene film according to Claim 27, wherein the propylene-ethylene-1-butene copolymer consists of 89 wt% of propylene, 2.0 wt% of ethylene and 9.0 wt% of 1-butene.
  29. 29. The polypropylene composition according to any one of claims 22, 23, and 25 to 28, wherein polypropylene (B) is a propylene homopolymer.
  30. 30. A polypropylene film made of the polypropylene composition according to any one of claims i9 to 29.
GB1322001.7A 2013-12-12 2013-12-12 Polypropylene composition, film thereof, and metallized film Withdrawn GB2521186A (en)

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