WO2013145943A1 - ガスバリアフィルムおよびガスバリアフィルムの製造方法 - Google Patents
ガスバリアフィルムおよびガスバリアフィルムの製造方法 Download PDFInfo
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- WO2013145943A1 WO2013145943A1 PCT/JP2013/053977 JP2013053977W WO2013145943A1 WO 2013145943 A1 WO2013145943 A1 WO 2013145943A1 JP 2013053977 W JP2013053977 W JP 2013053977W WO 2013145943 A1 WO2013145943 A1 WO 2013145943A1
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- film
- gas barrier
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- gas
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- 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
- C23C16/22—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 inorganic material, other than metallic material
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/34—Nitrides
- C23C16/345—Silicon nitride
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- 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
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0272—Deposition of sub-layers, e.g. to promote the adhesion of the main coating
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- 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
- C23C16/44—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 method of coating
- C23C16/50—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 method of coating using electric discharges
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- 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
- C23C16/44—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 method of coating
- C23C16/50—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 method of coating using electric discharges
- C23C16/505—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 method of coating using electric discharges using radio frequency discharges
- C23C16/509—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 method of coating using electric discharges using radio frequency discharges using internal electrodes
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- 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
- C23C16/44—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 method of coating
- C23C16/54—Apparatus specially adapted for continuous coating
- C23C16/545—Apparatus specially adapted for continuous coating for coating elongated substrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
- Y10T428/24967—Absolute thicknesses specified
- Y10T428/24975—No layer or component greater than 5 mils thick
Definitions
- the present invention relates to a gas barrier film used for a display and the like and a method for producing the gas barrier film.
- the gas barrier film has not only excellent gas barrier properties but also excellent transparency and flexibility, and the gas barrier film. It relates to a manufacturing method.
- a gas barrier film (water vapor barrier film) is formed on the packaging material.
- a gas barrier film formed by forming (depositing) a gas barrier film using a resin film or the like as a base material (substrate) is also used for each of the above applications.
- gas barrier film films made of various substances such as silicon oxide, silicon oxynitride, and aluminum oxide are known.
- a gas barrier film containing silicon nitride (silicon nitride) as a main component is known.
- the gas barrier film is required to have various characteristics depending on the application, such as high light transmittance (transparency) and high oxidation resistance as well as excellent gas barrier properties.
- various proposals have been made for gas barrier films made of silicon nitride.
- Patent Document 1 discloses that the N / Si composition is 1 to 1.4, the hydrogen content is 10 to 30 atomic%, and the Si—H stretching vibration in the Fourier transform infrared absorption spectrum.
- the absorption peak due to Si—H is located within 2170-2200 cm ⁇ 1 , and the absorption peak intensity I (Si—H) due to Si—H stretching vibration and the absorption due to Si—N stretching vibration near 840 cm ⁇ 1.
- Patent Document 2 discloses a transparent gas barrier property having a gas barrier layer composed of a low density layer, a high density layer, and a medium density layer formed between the low density layer and the high density layer on a substrate. A film is described. Since this transparent gas barrier film has such characteristics, it is possible to obtain a transparent gas barrier film having excellent adhesion and excellent transparency and gas barrier resistance.
- Patent Document 3 a negative pulsed high bias voltage is applied to a substrate, ions in the plasma are accelerated with high energy, and the ions are attracted to the substrate, and the carbon nitride film and the substrate are mixed. It is described that a layer is formed and then a carbon nitride film is formed on the mixed layer. According to this carbon nitride film manufacturing method, a carbon nitride film having high adhesion can be obtained by the mixed layer.
- Patent Document 4 describes a barrier film in which a resin layer is formed between a base material and a barrier layer.
- the barrier film has a resin layer between the base material and the barrier layer, whereby the adhesion between the base material and the barrier layer is improved and the barrier property is also improved.
- Patent Document 5 describes a gas barrier film in which a stress relaxation layer is formed between a base material and a gas barrier layer.
- the gas barrier film has a stress relaxation layer, so that flexibility is improved, bending resistance is increased, and adhesion between layers is further improved.
- Patent Document 1 in a gas barrier film mainly composed of silicon nitride, absorption due to Si—H stretching vibration in the composition ratio of silicon and nitrogen, the hydrogen content, and the Fourier transform infrared absorption spectrum. By prescribing the peak intensity and the like, it is possible to obtain a gas barrier film excellent not only in gas barrier properties but also in oxidation resistance, transparency and flexibility.
- the transparent gas barrier film of Patent Document 2 describes that a gas barrier film containing the same element improves adhesion between layers by having a low density layer, a medium density layer, and a high density layer. ing. However, this does not improve the adhesion between the gas barrier film and the organic film that is the underlying layer of the gas barrier film, and does not improve the flexibility and durability.
- Patent Document 3 in the method for producing a carbon nitride film, a mixed layer of the carbon nitride film and the substrate is formed between the carbon nitride film and the substrate, thereby improving the adhesion of the carbon nitride film.
- a carbon nitride film is formed on a member that requires wear resistance, such as a sliding member such as a bearing or a slide of various rotating machines, a tool, or the like. Therefore, unlike a gas barrier film that requires gas barrier properties, there is no description of a film containing silicon nitride as a main component.
- membrane is not considered.
- Patent Document 4 describes that a resin layer is formed between a base material and a barrier layer to improve adhesion and barrier properties. It is relatively easy to improve the adhesion between the organic substances (base material and resin layer). However, since the barrier layer is an inorganic substance and is hard and poor in reactivity, it is difficult to improve the adhesion between the resin layer and the barrier layer.
- Patent Document 5 describes that a stress relaxation layer is formed between a base material and a gas barrier layer to improve flexibility and adhesion.
- the gas barrier layer and the stress relaxation layer are formed by individually forming films. Therefore, there is a clear interface between the gas barrier layer and the stress relaxation layer, and it does not have sufficient adhesion.
- the base material is roughened and the adhesion between the base material and the gas barrier layer is improved by a physical anchor effect by the protrusions.
- peeling of the barrier layer occurs when a force greater than the anchor effect is applied.
- An object of the present invention is to solve the above-mentioned problems of the prior art.
- a gas barrier film having excellent transparency as well as high gas barrier properties, and excellent durability and flexibility, and the gas barrier. It is providing the manufacturing method of a film.
- the present invention provides a gas barrier film having a substrate having a surface made of an organic material and an inorganic film mainly composed of silicon nitride formed on the substrate,
- the composition ratio N / Si between nitrogen and silicon in the film is 1.00 to 1.35
- the film density is 2.1 to 2.4 g / cm 3
- the film thickness is 10 to 60 nm
- the substrate The gas barrier film is characterized in that the thickness of the mixed layer containing components derived from the organic material and the inorganic film formed at the interface between the organic film and the inorganic film is 5 to 40 nm.
- the substrate preferably has a layer formed by alternately forming an organic film and an inorganic film.
- this invention is a film-forming method which has the electrode pair arrange
- a manufacturing method is provided.
- a gas barrier film 80 shown in FIG. 1 has an inorganic film 84 as a gas barrier film on an organic film 82 of a substrate Z in which an organic film 82 is formed on the surface of a base material Z 0 as a base material.
- An organic material / inorganic material mixed layer 86 in which the organic material of the organic film 82 and the material of the inorganic film 84 are mixed at the interface between the film 82 and the inorganic film 84 hereinafter referred to as a mixed layer 86 for convenience). Is formed.
- the substrate Z (object to be processed) on which the inorganic film 84 is formed has a surface having various organic materials (organic matter) such as a polymer material (polymer / polymer) and a resin material. It consists of Various materials can be used for the substrate Z as long as the surface is formed of an organic material and an inorganic film can be formed by plasma CVD.
- a substrate Z made of a polymer material such as polyethylene terephthalate (PET), polyethylene naphthalate, polyethylene, polypropylene, polystyrene, polyamide, polyvinyl chloride, polycarbonate, polyacrylonitrile, polyimide, polyacrylate, polymethacrylate, It is exemplified as a suitable example.
- the substrate Z is preferably a film-like material (sheet-like material) such as a long film (web-like film) or a cut sheet-like film.
- the present invention is not limited to this, and various articles whose surface is made of an organic material, such as optical elements such as lenses and optical filters, photoelectric conversion elements such as organic EL and solar cells, and display panels such as liquid crystal displays and electronic paper ( Member) can also be used as the substrate Z.
- organic material such as optical elements such as lenses and optical filters, photoelectric conversion elements such as organic EL and solar cells, and display panels such as liquid crystal displays and electronic paper ( Member)
- display panels such as liquid crystal displays and electronic paper ( Member) can also be used as the substrate Z.
- the substrate Z has a plastic film (polymer film), an article made of an organic material, a metal film or a glass plate, various metal articles as a main body (base Z 0 ), a protective layer, An organic film 82 (film layer) made of an organic material for obtaining various functions, such as an adhesive layer, a light reflection layer, a light shielding layer, a planarization layer, a buffer layer, and a stress relaxation layer, is formed. Also good.
- these functional layers are not limited to one layer, and a substrate in which a plurality of functional layers are formed may be used as the substrate Z.
- the gas barrier film 80 of the illustrated example a material obtained by forming an organic film 82 on the surface of the substrate Z 0 and the substrate Z, on which the inorganic film 84 is formed, the organic film 82 and the inorganic film 84 A mixed layer 86 is formed at the interface.
- the film formation surface of the inorganic film 84 can be planarized .
- the forming material (main component) of the organic film 82 is not particularly limited, and various known organic substances (organic compounds) can be used.
- various resins (organic polymer compounds) can be used.
- epoxy resin acrylic resin, methacrylic resin, polyester, methacrylic acid-maleic acid copolymer, polystyrene, transparent fluororesin, polyimide, fluorinated polyimide, polyamide, polyamideimide, polyetherimide, cellulose acylate, polyurethane
- examples include polyether ketone, polycarbonate, fluorene ring-modified polycarbonate, alicyclic ring-modified polycarbonate, and fluorene ring-modified polyester.
- the method for forming the organic film 82 is not particularly limited, and all known methods for forming organic films can be used.
- a paint prepared by dissolving (dispersing) an organic substance, an organic monomer, or a polymerization initiator in a solvent is applied to the substrate Z by a known application means such as a roll coat, a gravure coat, or a spray coat.
- the coating method include drying, drying, and curing by heating, ultraviolet irradiation, electron beam irradiation, or the like, if necessary.
- organic or evaporating the same coating as the coating method by attaching the vapor to the substrate Z 0, cooled / condensed to form a liquid film, curing the film by ultraviolet rays or electron beams
- a flash vapor deposition method in which film formation is performed can also be suitably used.
- a transfer method for transferring the organic film 82 formed into a sheet shape can also be used.
- the thickness of the organic film 82 is not particularly limited, and may be set as appropriate according to the surface properties and thickness of the substrate Z, the required gas barrier properties, and the like.
- the thickness of the organic film 82 is preferably 0.1 to 50 ⁇ m.
- the organic film 82 is not limited to be formed of a single organic film, and the organic film 82 may be formed of a plurality of organic films.
- an organic film formed by flash vapor deposition may be provided on an organic film formed by a coating method, and the organic film 82 may be formed by the two layers of organic films.
- an inorganic film 84 is formed on the organic film 82.
- This inorganic film 84 is a gas barrier film, mainly composed of silicon nitride (silicon nitride), and has a composition ratio (atomic ratio) of N / Si (nitrogen / silicon) of 1 to 1.35. The density is 2.1 to 2.4 g / cm 3 and the film thickness is 10 to 60 nm. Further, a mixed layer 86 is formed at the interface between the organic film 82 and the inorganic film 84, and the thickness of the mixed layer 86 is 5 to 40 nm.
- the mixed layer 86 is a layer including a component derived from the organic film 82 and a component derived from the inorganic film 84. Therefore, the position (surface) where the component derived from the inorganic film 84 disappears is the boundary between the organic film 82 and the mixed layer 86. Further, the position (surface) where the component derived from the organic film 82 disappears is the boundary between the inorganic film 84 and the mixed layer 86.
- a mixed layer 86 containing components derived from the organic film 82 and the inorganic film 84 is formed between the organic film 82 and the inorganic film 84, and a clear interface between the organic film 82 and the inorganic film 84 is formed. There is no state.
- the present invention realizes a gas barrier film having not only gas barrier properties but also excellent transparency (light transmittance) as well as durability and flexibility by having such a configuration.
- Patent Document 1 discloses not only the composition ratio of silicon and nitrogen, but also the content of hydrogen, Si in the Fourier transform infrared absorption spectrum. It has been proposed to define the peak intensity of absorption due to -H stretching vibration.
- Patent Document 2 proposes that the gas barrier layer is composed of a low density layer, a medium density layer, and a high density layer.
- Patent Document 4 proposes forming an organic film between a base material and a gas barrier layer.
- Patent Document 5 proposes forming a stress relaxation layer between a base material and a gas barrier layer.
- the gas barrier film of Patent Document 2 does not improve the flexibility and durability by improving the adhesion between the gas barrier film and the organic film that is the base layer of the gas barrier film.
- the barrier film of Patent Document 4 does not have sufficient adhesion between the organic film and the gas barrier layer, and the barrier film of Patent Document 5 does not have sufficient adhesion between the stress relaxation layer and the gas barrier layer. .
- the composition ratio N / Si, the film density, and the film thickness of the inorganic film 84 that is a gas barrier film are defined, and the mixed layer at the interface between the organic film 82 and the inorganic film 84 is also focused And the thickness of the mixed layer 86 is defined.
- the present invention realizes a gas barrier film that is excellent in flexibility and durability in addition to gas barrier properties and transparency.
- the inorganic film 84 of the gas barrier film of the present invention is a film mainly composed of silicon nitride, and the N / Si composition ratio is 1 to 1.35. If the composition ratio of N / Si is less than 1, the inorganic film 84 is colored, resulting in inconvenience that the inorganic film 84 having sufficient transparency cannot be obtained. Conversely, when the N / Si composition ratio exceeds 1.35, durability and flexibility are deteriorated. For this reason, there are disadvantages such that a sufficient gas barrier property cannot be secured over a long period of time, and the inorganic film 84 is easily broken.
- the N / Si composition ratio is preferably 1.05 to 1.25 in that the above advantages can be obtained more suitably.
- the film density of the inorganic film 84 is 2.1 to 2.4 g / cm 3 .
- the film density of the inorganic film 84 is more preferably 2.2 to 2.35 g / cm 3 in that the above advantages can be obtained more suitably.
- the inorganic film 84 has a thickness of 10 to 60 nm.
- the gas barrier property is basically preferably that the inorganic film 84 is thick, but if it exceeds 60 nm, the flexibility tends to be lowered. Therefore, by setting the thickness of the inorganic film 84 to 60 nm or less, it is possible to ensure the flexibility of the inorganic film 84 and to suitably prevent cracks and the like.
- the thickness of the inorganic film 84 is more preferably 15 to 50 nm in that the above advantages can be obtained more suitably.
- a mixed layer 86 having a thickness of 5 to 40 nm is formed at the interface between the organic film 82 and the inorganic film 84.
- a mixed layer 86 which is a layer in which the components of the organic film 82 and the inorganic film 84 are mixed, between the organic film 82 and the inorganic film 84, between the organic film 82 and the inorganic film 84, There is no clear interface. Therefore, the organic film 82 and the inorganic film 84 are chemically bonded via the mixed layer 86, and a strong adhesion can be obtained.
- the organic film 82 made of an organic compound and the inorganic film 84 containing silicon nitride as a main component have different compositions, so the adhesion is low, and there is a difference in density and flexibility. Therefore, if the thickness of the mixed layer 86 between the organic film 82 and the inorganic film 84 is smaller than 5 nm, the adhesion cannot be sufficiently improved. Further, the density difference between the organic film 82 and the inorganic film 84 is absorbed, and flexibility cannot be ensured. By forming the mixed layer 86 having a thickness of 5 nm or more, the adhesion between the organic film 82 and the inorganic film 84 can be improved.
- the difference in density between the organic film 82 and the inorganic film 84 can be absorbed to ensure flexibility.
- a suitable gas barrier film can be manufactured by setting it as 40 nm or less, without reducing production efficiency.
- the thickness of the mixed layer 86 is more preferably 10 to 30 nm in that the above advantages can be more suitably obtained.
- the mixed layer 86 is a layer including a component derived from the organic film 82 and a component derived from the inorganic film 84. Since the inorganic film 84 is mainly composed of silicon nitride, the component derived from the inorganic film 84 is silicon or the like. The component derived from the organic film 82 is carbon or the like. Therefore, the elemental analysis is performed by XPS (X-ray photoelectron spectrometer) while etching from the surface of the gas barrier film 80 on the inorganic film 84 side, and the presence or absence of silicon and carbon is observed. The film thickness can be determined. Or the film thickness of the inorganic film
- XPS X-ray photoelectron spectrometer
- the gas barrier film 90 shown conceptually in FIG. 2 by forming a mixed layer 86a and the inorganic film 84a on the substrate Z that organic film 82a on the substrate Z 0 is formed, the organic thereon A structure in which two or more combinations of the organic film 82, the inorganic film 84, and the mixed layer 86 are stacked, such as a structure in which the film 82b is formed and the mixed layer 86b and the inorganic film 84b are formed thereon.
- a plurality of organic films 82, mixed layers 86, and inorganic films 84 may be alternately stacked.
- the organic film 82 and the inorganic film 84 are plural. However, only one of them may be plural layers.
- the number of 82 and the inorganic film 84 may not be the same.
- the organic film 82 may be the uppermost layer in terms of surface protection. In particular, when the organic film 82 has a plurality of layers, the organic film 82 is preferably the uppermost layer.
- the gas barrier is superior in terms of gas barrier properties, durability, flexibility, mechanical strength, long-term maintenance of gas barrier properties, light extraction efficiency, and the like.
- a film can be obtained.
- the gas barrier film of the present invention when it has a plurality of inorganic films, at least one layer may be the inorganic film 84 that forms the mixed layer 86 at the interface with the organic film 82 that is the base. . That is, as the inorganic film, in addition to the inorganic film 84 containing silicon nitride as a main component, a silicon oxide film or an aluminum oxide film may be included. However, when the gas barrier film of the present invention has a plurality of inorganic films, it is preferable that all of the inorganic films are inorganic films 84 that form a mixed layer 86 at the interface with the organic film 82 that is the base. .
- FIG. 3 conceptually shows an example of a film forming apparatus for carrying out the manufacturing method of the present invention.
- the film forming apparatus 10 shown in FIG. 3 is basically a known roll-to-roll film forming apparatus using plasma CVD except that the film forming conditions are different.
- the film forming apparatus 10 in the illustrated example forms a film (manufacturing a target function) by plasma CVD on the surface of the substrate Z while conveying a long substrate Z (film original) in the longitudinal direction. / Form) to produce a functional film. Also, the film forming apparatus 10 forms a functional film by feeding the substrate Z out of a substrate roll 32 formed by winding a long substrate Z into a roll and transporting it in the longitudinal direction. This is an apparatus for forming a film by so-called roll-to-roll, in which the substrate Z (that is, a functional film) is wound into a roll shape. The substrate Z is one obtained by forming an organic film 82 on the substrate Z 0.
- the film forming apparatus 10 shown in FIG. 3 is an apparatus that can form a film on the substrate Z by CCP (Capacitively Coupled ⁇ Plasma capacitively coupled plasma) -CVD.
- the film forming apparatus 10 includes a vacuum chamber 12, an unwind chamber 14 formed in the vacuum chamber 12, a film forming chamber 18, and a drum 30.
- the long substrate Z is supplied from the substrate roll 32 of the unwind chamber 14 and is transported in the longitudinal direction while being wound around the drum 30, while the film is formed in the film forming chamber 18. Then, it is wound around the winding shaft 34 again in the unwinding chamber 14 (winded in a roll shape).
- the drum 30 is a cylindrical member that rotates counterclockwise in the drawing around the center line.
- the drum 30 wraps the substrate Z guided by a guide roller 40a of the unwind chamber 14 described later along a predetermined path around a predetermined area of the peripheral surface and conveys the substrate Z in the longitudinal direction while holding it at a predetermined position. It is conveyed into the film chamber 18 and sent to the guide roller 40b in the unwind chamber 14.
- the drum 30 also functions as a counter electrode of a shower electrode 20 in the film formation chamber 18 described later (that is, the drum 30 and the shower electrode 20 constitute an electrode pair). Further, a bias power source 48 is connected to the drum 30.
- the bias power source 48 is a power source that supplies bias power to the drum 30.
- the bias power source 48 is basically a known bias power source that is used in various plasma CVD apparatuses.
- the bias power supplied from the bias power source 48 to the drum 30 is a frequency lower than the plasma excitation power and is 0.1 to 1 MHz.
- the bias power supplied from the bias power supply 48 to the drum 30 is 0.02 to 0.5 times the plasma excitation power supplied from the high frequency power supply 60 described later to the shower electrode 20. This will be described in detail later.
- the unwinding chamber 14 includes an inner wall surface 12a of the vacuum chamber 12, a peripheral surface of the drum 30, and partition walls 36a and 36b extending from the inner wall surface 12a to the vicinity of the peripheral surface of the drum 30.
- the tips of the partition walls 36a and 36b are close to the peripheral surface of the drum 30 to a position where they cannot contact the substrate Z to be transported,
- the film forming chamber 18 is separated from the film forming chamber 18 in a substantially airtight manner.
- the unwinding chamber 14 has the above-described winding shaft 34, guide rollers 40a and 40b, a rotating shaft 42, and a vacuum exhaust means 46.
- Guide rollers 40a and 40b are ordinary guide rollers that guide the substrate Z along a predetermined transport path.
- the take-up shaft 34 is a well-known long take-up shaft for taking up the film-formed substrate Z.
- a substrate roll 32 formed by winding a long substrate Z into a roll is mounted on a rotating shaft 42.
- the substrate Z is passed through a predetermined path that reaches the winding shaft 34 through the guide roller 40a, the drum 30, and the guide roller 40b (see FIG. Inserted).
- the feeding of the substrate Z from the substrate roll 32 and the winding of the film-formed substrate Z on the winding shaft 34 are performed in synchronization, and the long substrate Z is transferred along a predetermined transport path.
- the film is formed in the film forming chamber 18 while being conveyed in the longitudinal direction.
- the vacuum exhaust means 46 is a vacuum pump for reducing the pressure in the unwinding chamber 14 to a predetermined degree of vacuum.
- the vacuum exhaust means 46 makes the inside of the unwinding chamber 14 a pressure (degree of vacuum) that does not affect the pressure in the film forming chamber 18 (film forming pressure).
- a film forming chamber 18 is disposed downstream of the unwind chamber 14.
- the film forming chamber 18 includes an inner wall surface 12 a, a peripheral surface of the drum 30, and partition walls 36 a and 36 b extending from the inner wall surface 12 a to the vicinity of the peripheral surface of the drum 30.
- the film forming chamber 18 forms a film on the surface of the substrate Z by CCP (Capacitively Coupled Plasma) -CVD, and includes a shower electrode 20, a source gas supply means 58, And a high frequency power source 60 and a vacuum exhaust means 62.
- CCP Capacitively Coupled Plasma
- the shower electrode 20 constitutes an electrode pair together with the drum 30 when the film forming apparatus 10 forms a film by CCP-CVD.
- the shower electrode 20 has a hollow, substantially rectangular parallelepiped shape as an example, and is disposed with the discharge surface, which is one maximum surface, facing the peripheral surface of the drum 30.
- a large number of through holes are formed on the entire discharge surface, which is the surface facing the drum 30.
- the shower electrode 20 generates plasma for film formation between the discharge surface and the peripheral surface of the drum 30 forming the electrode pair, thereby forming a film formation region.
- the source gas supply means 58 is a known gas supply means used in a vacuum film forming apparatus such as a plasma CVD apparatus, and supplies a source gas into the shower electrode 20. As described above, many through holes are supplied to the surface of the shower electrode 20 facing the drum 30. Accordingly, the source gas supplied to the shower electrode 20 is introduced between the shower electrode 20 and the drum 30 through the through hole.
- the high frequency power source 60 is a power source that supplies plasma excitation power to the shower electrode 20.
- the high-frequency power supply 60 all known high-frequency power supplies used in various plasma CVD apparatuses can be used.
- the vacuum evacuation means 62 evacuates the inside of the film forming chamber 18 to maintain a predetermined film forming pressure in order to form a gas barrier film by plasma CVD.
- the vacuum evacuation means 62 is a known vacuum evacuation means used in a vacuum film forming apparatus.
- the high-frequency power source 60 supplies high-frequency plasma excitation power of 10 to 100 MHz to the shower electrode 20 that is one of the electrode pairs
- the bias power source 48 includes: Film formation is performed by supplying a bias power of 0.02 to 0.5 times the plasma excitation power to the drum 30 constituting the shower electrode 20 and the electrode pair at a low frequency of 0.1 to 1 MHz. .
- the drum 30 constituting the electrode pair with the shower electrode 20 has a low frequency of 0.1 to 1 MHz.
- a bias power of 0.02 to 0.5 times the plasma excitation power is supplied, the source gas ionized by the plasma excitation power is pulled toward the substrate Z and drawn into the organic film 82. Therefore, the mixed layer 86 having a certain thickness, that is, a thickness of 5 to 40 nm can be formed.
- the bias power is 0.02 times or less of the plasma excitation power
- a sufficiently thick mixed layer cannot be formed, and flexibility may be lowered.
- the film density of the inorganic film is lowered, and there is a possibility that sufficient gas barrier properties cannot be obtained.
- the bias power is 0.5 times or more of the plasma excitation power
- the film density of the inorganic film becomes too high and flexibility may be lowered.
- the bias power is preferably 0.02 to 0.5 times the plasma excitation power.
- the composition ratio of N / Si in the film of the inorganic film 84 to be formed is set to 1 to 1.35, and the film density is set to 2.1 to 2.4 g. / Cm 3 .
- the raw material gas may be used in combination with various gases such as helium gas, neon gas, argon gas, krypton gas, xenon gas, radon gas and other inert gases, hydrogen gas, etc. Good.
- the film forming pressure in the film forming chamber 18 is preferably 10 to 80 Pa.
- the film forming pressure is less than 10 Pa, it is difficult to increase the film forming rate.
- the film forming pressure exceeds 80 Pa, the reaction of the raw material gas proceeds in the air, and fine powder may be generated. Therefore, the film quality of the film formed on the substrate Z is deteriorated.
- a long substrate is transported in the longitudinal direction of the substrate and wound around a drum to form a film, so-called roll-to-roll (Roll to Roll).
- roll-to-roll Roll to Roll
- the present invention is not limited to this.
- a roll-to-roll apparatus in which a plate-like electrode pair disposed facing each other is provided in a film forming chamber, and a long substrate is conveyed in the longitudinal direction between the electrode pair, A film may be formed by plasma CVD by supplying a source gas between the substrate and the electrode.
- Example 1 An inorganic film 84 (gas barrier film), which is a silicon nitride film, was formed on the substrate Z by the manufacturing method of the present invention using the film forming apparatus 10 that performs film formation by the CCP-CVD method.
- the substrate Z a substrate in which an organic film 82 mainly composed of acrylate was formed on the surface of a PET film (A4300 manufactured by Toyobo Co., Ltd.) having a thickness of 100 ⁇ m was used.
- the visible light transmittance of the substrate Z was 91%.
- silane gas (SiH 4 ), ammonia gas (NH 3 ), and hydrogen gas (H 2 ) were used as source gases.
- the flow rate of silane gas was 100 sccm
- the flow rate of ammonia gas was 200 sccm
- the flow rate of hydrogen gas was 1000 sccm. That is, the flow ratio of silane gas and ammonia gas was 1: 2.
- a high frequency power source having a frequency of 13.56 MHz was used as the high frequency power source 60, and 2 kW of power was supplied to the shower electrode 20. Further, a high frequency power source having a frequency of 0.4 MHz was used as the bias power source 48, and 0.2 kW (0.1 times the plasma excitation power) was supplied to the drum 30. Further, the exhaust in the vacuum chamber was adjusted so that the pressure in the vacuum chamber was 50 Pa. Moreover, the conveyance speed of the board
- the functional film was formed on the substrate Z for 10 m in the film forming apparatus 10. Then, about the obtained gas barrier film 80, the thickness of the inorganic film
- the distribution amounts of nitrogen and silicon in the inorganic film 84 were measured by XPS (X-ray photoelectron spectroscopy) using an X-ray photoelectron spectrometer (ESCA-3400 manufactured by Shimadzu Corporation).
- the composition ratio N / Si of the film was 1.15.
- the thickness of the mixed layer 86 is etched by XPS (X-ray photoelectron spectroscopy) using an X-ray photoelectron spectrometer (ESCA-3400 manufactured by Shimadzu Corporation) while etching from the surface of the gas barrier film 80 on the inorganic film 84 side. Elemental analysis was performed, and it was determined by a method of observing the presence or absence of silicon and carbon. As a result, the thickness of the mixed layer 86 was 15 nm.
- the visible light transmittance of the gas barrier film 80 was measured by using a spectrophotometer (U-4000 manufactured by Hitachi High-Tech), and the average transmittance (including the substrate) at a wavelength of 400 to 800 nm.
- the visible light transmittance was 87.1%.
- the water vapor transmission rate was 2.5 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] immediately after the production, and 3.1 ⁇ 10 ⁇ 5 [g / (m 2 ) after being left for 1000 hours. ⁇ Day)], and after bending, it was 2.8 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)].
- Example 2 A gas barrier film 80 was produced in the same manner as in Example 1 except that the bias power supplied to the drum 30 was 0.4 kW (0.2 times the plasma excitation power). Thereafter, the film thickness, film density, composition ratio, and film thickness of the mixed layer 86 of the inorganic film 84 were measured. As a result, the film thickness of the inorganic film 84 was 42.3 nm, the film density was 2.31 g / cm 3 , the composition ratio N / Si was 1.20, and the film thickness of the mixed layer 86 was 21 nm. It was. Therefore, it satisfied the scope of the present invention. Further, the visible light transmittance and the water vapor transmittance of this gas barrier film 80 were measured.
- the visible light transmittance was 87.5%. Further, the water vapor transmission rate is 1.9 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] immediately after the production, and 2.2 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day) after being left for 1000 hours. day)], and after bending, it was 2.4 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)].
- Example 3 An organic film 82b mainly composed of acrylate is formed on the surface of the gas barrier film 80 produced in the same manner as in Example 1, and this is used as a substrate to form an inorganic film 84b again in the same manner as in Example 1.
- FIG. A gas barrier film 90 in which an organic film 82 and an inorganic film 84 were laminated as shown in FIG. Thereafter, the film thickness, film density, composition ratio, and film thickness of the mixed layers 86a and 86b of the inorganic films 84a and 84b were measured.
- the film thickness of the inorganic film 84a is 40.6 nm
- the film density is 2.24 g / cm 3
- the composition ratio N / Si is 1.16
- the film thickness of the inorganic film 84b is 38.9 nm.
- the film density was 2.21 g / cm 3
- the composition ratio N / Si was 1.12
- the thickness of the mixed layer 86a was 14 nm
- the thickness of the mixed layer 86b was 17 nm. That is, it satisfied the scope of the present invention.
- the visible light transmittance and the water vapor transmittance of this gas barrier film 90 were measured. As a result, the visible light transmittance was 86.6%.
- the water vapor transmission rate is 1.0 ⁇ 10 ⁇ 5 or less [g / (m 2 ⁇ day)] immediately after fabrication, and 1.0 ⁇ 10 ⁇ 5 or less [g / (m 2 ⁇ day)] and after bending, it was 1.0 ⁇ 10 ⁇ 5 or less [g / (m 2 ⁇ day)].
- Example 1 A gas barrier film was produced in the same manner as in Example 1 except that no bias power was supplied to the drum 30 (0 kW). Then, the film thickness of the inorganic film, the film density, the composition ratio, and the film thickness of the mixed layer were measured. As a result, the film thickness of the inorganic film was 40.1 nm, the film density was 2.02 g / cm 3 , the composition ratio N / Si was 1.05, and the film thickness of the mixed layer 86 was 3 nm. . That is, it did not satisfy the scope of the present invention. With respect to this gas barrier film, the visible light transmittance and the water vapor transmittance were measured. As a result, the visible light transmittance was 85.5%.
- the water vapor transmission rate is 4.7 ⁇ 10 ⁇ 4 [g / (m 2 ⁇ day)] immediately after the production, and 8.0 ⁇ 10 ⁇ 3 [g / (m 2 ⁇ day) after being left for 1000 hours. day)], and after bending, it was 3.6 ⁇ 10 ⁇ 3 [g / (m 2 ⁇ day)].
- Example 2 A gas barrier film was prepared in the same manner as in Example 1 except that the flow rate of ammonia gas was 320 sccm and the flow rate ratio of silane gas to ammonia gas was 1: 3.2. Then, the film thickness of the inorganic film, the film density, the composition ratio, and the film thickness of the mixed layer were measured. As a result, the film thickness of the inorganic film was 38.6 nm, the film density was 2.27 g / cm 3 , the composition ratio N / Si was 1.37, and the film thickness of the mixed layer 86 was 17 nm. . That is, it did not satisfy the scope of the present invention.
- the visible light transmittance and the water vapor transmittance were measured. As a result, the visible light transmittance was 89.2%. Further, the water vapor transmission rate is 4.8 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] immediately after the production, and 1.5 ⁇ 10 ⁇ 4 [g / (m 2 ⁇ day) after being left for 1000 hours. day)] and 2.3 ⁇ 10 ⁇ 3 [g / (m 2 ⁇ day)] after bending.
- a gas barrier film was produced in the same manner as in Example 1 except that the flow rate of ammonia gas was 100 sccm and the flow rate ratio of silane gas to ammonia gas was 1: 1. Then, the film thickness of the inorganic film, the film density, the composition ratio, and the film thickness of the mixed layer were measured. Then, the film thickness of the inorganic film was 39.5 nm, the film density was 2.18 g / cm 3 , the composition ratio N / Si was 0.97, and the film thickness of the mixed layer 86 was 12 nm. That is, it did not satisfy the scope of the present invention. With respect to this gas barrier film, the visible light transmittance and the water vapor transmittance were measured.
- the visible light transmittance was 83.8%.
- the water vapor transmission rate is 3.9 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] immediately after the production, and 4.6 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day) after being left for 1000 hours. day)] and 4.4 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] after bending.
- Example 4 A gas barrier film was produced in the same manner as in Example 1 except that the conveyance speed was 0.7 m / min. Then, the film thickness of the inorganic film, the film density, the composition ratio, and the film thickness of the mixed layer were measured. As a result, the film thickness of the inorganic film was 68.7 nm, the film density was 2.25 g / cm 3 , the composition ratio N / Si was 1.14, and the film thickness of the mixed layer 86 was 17 nm. . That is, it did not satisfy the scope of the present invention. With respect to this gas barrier film, the visible light transmittance and the water vapor transmittance were measured. As a result, the visible light transmittance was 86.0%.
- the water vapor transmission rate is 1.6 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] immediately after the production, and 2.0 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day) after being left for 1000 hours. day)], and after bending, it was 4.7 ⁇ 10 ⁇ 3 [g / (m 2 ⁇ day)].
- Example 5 A gas barrier film was produced in the same manner as in Example 1 except that the bias power supplied to the drum was 1.1 kW (0.55 times the plasma excitation power). Then, the film thickness of the inorganic film, the film density, the composition ratio, and the film thickness of the mixed layer were measured. As a result, the film thickness of the inorganic film was 32.1 nm, the film density was 2.44 g / cm 3 , the composition ratio N / Si was 1.27, and the film thickness of the mixed layer 86 was 43 nm. . That is, it did not satisfy the scope of the present invention. With respect to this gas barrier film, the visible light transmittance and the water vapor transmittance were measured.
- the visible light transmittance was 88.1%.
- the water vapor transmission rate is 2.3 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day)] immediately after fabrication, and 3.5 ⁇ 10 ⁇ 5 [g / (m 2 ⁇ day) after leaving for 1000 hours. day)] and 7.1 ⁇ 10 ⁇ 4 [g / (m 2 ⁇ day)] after bending.
- the measurement results are shown in Table 1.
- Examples 1 to 3 which are examples of the present invention, have excellent gas barrier properties and high light transmittance. Further, it can be seen that the gas barrier property does not deteriorate even after being left for 1000 hours, so that it has high durability. Furthermore, even after repeated bending, the gas barrier property does not deteriorate, so that it can be seen that it has high flexibility.
- Comparative Example 1 it can be seen from Comparative Example 1 that the gas barrier properties deteriorate when the film density is low. Moreover, when the thickness of a mixed layer is thin, it turns out that a softness
- composition ratio N / Si becomes too high when the flow rate ratio of ammonia gas to silane gas during film formation increases. Moreover, it can be seen from Comparative Example 3 that the transmittance decreases when the composition ratio N / Si is low. It can also be seen that the composition ratio N / Si is too low when the flow rate ratio of ammonia gas to silane gas during film formation is low.
- Comparative Example 4 it can be seen from Comparative Example 4 that as the inorganic film becomes thicker, the flexibility is lowered and the gas barrier property after repeated bending is lowered.
- Comparative Example 5 it can be seen from Comparative Example 5 that as the film density of the inorganic film increases, the flexibility decreases and the gas barrier property after repeated bending decreases. It can also be seen that the density of the inorganic film increases as the bias power ratio is increased. From the above results, the effect of the present invention is clear.
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Abstract
Description
これに応じて、窒化シリコンからなるガスバリア膜においても、各種の提案がなされている。
このガスバリア膜は、このような特徴を有することにより、ガスバリア性に加えて、優れた耐酸化性、透明性および可撓性を有するガスバリア膜を得ることができる。
この透明ガスバリア性フィルムは、このような特徴を有することにより、密着性に優れ、かつ良好な透明性、ガスバリア耐性を備えた透明ガスバリア性フィルムを得ることができる。
この窒化炭素膜の製造方法によれば、混合層により密着性の高い窒化炭素膜を得ることができるとしている。
また、基板は、有機膜と無機膜とを交互に形成してなる層を有することが好ましい。
また、無機膜を成膜する際の成膜圧力を10~80Paとすることが好ましい。
図1に示されるガスバリアフィルム80は、母材である基材Z0の表面に有機膜82が形成された基板Zの有機膜82の上に、ガスバリア膜である無機膜84を有し、有機膜82と無機膜84との界面に、有機膜82の有機材料と無機膜84の材料とが混在する状態の有機材料/無機材料の混合層86(以下、便宜的に混合層86とする)が形成されたものである。
基板Zは、表面が有機材料で形成され、プラズマCVDによる無機膜の成膜が可能なものであれば、各種の物が利用可能である。具体的には、ポリエチレンテレフタレート(PET)、ポリエチレンナフタレート、ポリエチレン、ポリプロピレン、ポリスチレン、ポリアミド、ポリ塩化ビニル、ポリカーボネート、ポリアクリロニトリル、ポリイミド、ポリアクリレート、ポリメタクリレートなどの高分子材料からなる基板Zが、好適な一例として例示される。
また、本発明において、基板Zは、長尺なフィルム(ウエブ状のフィルム)やカットシート状のフィルムなどのフィルム状物(シート状物)が好適である。しかしながら、これに限定はされず、レンズや光学フィルタなどの光学素子、有機ELや太陽電池などの光電変換素子、液晶ディスプレイや電子ペーパーなどのディスプレイパネル等、表面が有機材料からなる各種の物品(部材)も、基板Zとして利用可能である。
この際において、これらの機能層は、1層に限定はされず、複数層の機能層が形成されているものを、基板Zとして用いてもよい。
本発明においては、無機膜84の下地層として、有機膜82を有することにより、基材Z0の表面に存在する凹凸を埋没させて、無機膜84の成膜面を平坦にすることができる。これにより、無機膜84すなわちガスバリア膜の有する優れた特性を、十分に発現して、ガスバリア性のみならず、透明性や耐久性、さらには、柔軟性がより良好なガスバリアフィルム80を得ることができる。
一例として、エポキシ樹脂、アクリル樹脂、メタクリル樹脂、ポリエステル、メタクリル酸―マレイン酸共重合体、ポリスチレン、透明フッ素樹脂、ポリイミド、フッ素化ポリイミド、ポリアミド、ポリアミドイミド、ポリエーテルイミド、セルロースアシレート、ポリウレタン、ポリエーテルケトン、ポリカーボネート、フルオレン環変性ポリカーボネート、脂環変性ポリカーボネート、フルオレン環変性ポリエステル等が例示される。
一例として、有機物や有機物モノマー、さらには重合開始剤等を溶媒に溶解(分散)して調製した塗料を、ロールコート、グラビアコート、スプレーコート、等の公知の塗布手段で基板Zに塗布して、乾燥し、必要に応じて、加熱、紫外線照射、電子線照射等によって硬化する、塗布法が例示される。また、有機物あるいは前記塗布法と同様の塗料を蒸発させて、その蒸気を基材Z0に付着させて、冷却/凝縮して液体状の膜を形成し、この膜を紫外線や電子線によって硬化することで成膜を行なう、フラッシュ蒸着法も好適に利用可能である。また、シート状に成形した有機膜82を転写する転写法も利用可能である。
有機膜82の厚さを、上記範囲とすることにより、基板Zの表面に存在する凹凸をより確実に包埋して無機膜84の成膜面を好適に平坦にできる、密着性、柔軟性を向上できる、高い透明性を保つことができる等の点で、好ましい結果を得ることができる。
例えば、塗布法で成膜した有機物の膜の上に、フラッシュ蒸着で成膜した有機物の膜を設け、この2層の有機膜によって、有機膜82を形成してもよい。
この無機膜84は、ガスバリア膜であって、窒化シリコン(窒化珪素)を主成分とし、かつ、N/Si(窒素/シリコン)の組成比(原子比)が1~1.35であり、膜密度が2.1~2.4g/cm3であり、膜厚が10~60nmである。
また、有機膜82と無機膜84の界面には、混合層86が形成されており、この混合層86の厚みが5~40nmである。
ガスバリアフィルム80は、有機膜82と無機膜84との間に、有機膜82および無機膜84に由来する成分を含む混合層86が形成されて、有機膜82と無機膜84との明確な界面が無い状態に形成されている。
このような要求を満たす、より優れた特性を有するガスバリア膜を実現するために、特許文献1では、シリコンと窒素の組成比のみならず、水素の含有率、フーリエ変換赤外吸収スペクトルにおける、Si-Hの伸縮振動による吸収のピーク強度などを規定することが提案されている。また、特許文献2では、ガスバリア層を低密度層、中密度層、高密度層から構成することが提案されている。また、特許文献4では、基材とガスバリア層との間に有機膜を形成することが提案されている。また、特許文献5では、基材とガスバリア層との間に応力緩和層を形成することが提案されている。
また、特許文献2のガスバリアフィルムは、ガスバリア膜とガスバリア膜の下地層である有機膜との密着性を向上させ、柔軟性や耐久性を向上させるものではなかった。
また、特許文献4のバリアフィルムは、有機膜とガスバリア層との密着性が十分ではなく、また、特許文献5のバリア性フィルムは、応力緩和層とガスバリア層との密着性が十分ではなかった。
N/Siの組成比が1未満では、無機膜84が着色して十分な透明性を有する無機膜84を得ることができない等の不都合を生じる。
逆に、N/Siの組成比が1.35を超えると、耐久性、柔軟性が低下してしまう。そのため、十分なガスバリア性を長期に渡って確保できない、無機膜84が割れ易くなってしまう等の不都合を生じる。
上記利点を、より好適に得られる等の点で、N/Siの組成比は、1.05~1.25が好ましい。
膜密度を2.1g/cm3以上とすることにより、より高い耐久性を確保できる、長期に渡って十分なガスバリア性を確保できる、基板Zや下層との密着性を向上できる等の点で好ましい結果を得る。また、膜密度が高くなると、柔軟性がなくなり、膜が割れやすくなる傾向にある。そこで、膜密度を2.4g/cm3以下とすることにより、膜密度が高く柔軟性が低下することに起因する割れを好適に防止できる、基板Zや下層との密着性を向上できる等の点で好ましい結果を得る。
上記利点を、より好適に得られる等の点で、無機膜84の膜密度は、2.2~2.35g/cm3とするのが、より好ましい。
無機膜84の厚さを10nm以上とすることにより、十分なガスバリア性を安定して確保することができる。また、ガスバリア性は、基本的に、無機膜84が厚い方が好ましいが、60nmを超えると柔軟性が低下してわれやすくなる。そのため、無機膜84の厚さを60nm以下とすることにより、無機膜84の柔軟性を確保して割れ等を好適に防止することができる。
また、上記利点を、より好適に得られる等の点で、無機膜84の厚さは、より好ましくは、15~50nmである。
有機膜82と無機膜84との間に、有機膜82と無機膜84の成分が混合された層である混合層86が形成されることにより、有機膜82と無機膜84との間に、明確な界面が存在しなくなる。そのため、有機膜82と無機膜84とが混合層86を介して化学的に結合され、強力な密着力を得ることができる。
また、有機化合物からなる有機膜82と窒化シリコンを主成分とする無機膜84とでは組成が異なるため密着性が低く、また、密度差があり柔軟性に差がある。そのため、有機膜82と無機膜84との間の混合層86の厚みが5nmより小さいと、密着性を十分に向上することができない。また、有機膜82と無機膜84との密度差を吸収し、柔軟性を確保することができない。厚みが5nm以上の混合層86を形成することにより、有機膜82と無機膜84の密着性を向上することができる。また、有機膜82と無機膜84との密度差を吸収し、柔軟性を確保することができる。
また、混合層86の厚みが40nmを超えると、成膜レートが低下してしまい、ガスバリアフィルムの生産効率が低下してしまう。そのため、40nm以下とすることにより、生産効率を低下させることなく、好適なガスバリアフィルムを製造することができる。
また、上記利点を、より好適に得られる等の点で、混合層86の厚さは、より好ましくは、10~30nmである。
従って、ガスバリアフィルム80の無機膜84側の表面からエッチングしながらXPS(X線光電子分光装置)によって元素分析を行って、シリコンと炭素の有無を観察する方法により、無機膜84および混合層86の膜厚を求めることができる。あるいは、ガスバリアフィルム80を厚さ方向に断面を取って、この断面を電子顕微鏡で観察して測定する方法により、無機膜84および混合層86の膜厚を求めることができる。
このように、複数の有機膜82と混合層86および無機膜84とを、交互に積層することにより、ガスバリア性の点で、より好ましい結果を得る。
また、本発明においては、有機膜82および無機膜84の両方が複数であるのが好ましいが、いずれか一方のみが複数層であってもよく、両層を複数層有する場合には、有機膜82と無機膜84の数は、同数でなくてもよい。
さらに、本発明においては、表面保護の点で有機膜82を最上層としてもよく、特に、有機膜82を、複数層、有する場合には、有機膜82を最上層とするのが好ましい。
しかしながら、本発明のガスバリアフィルムにおいて、複数の無機膜を有する場合には、全ての無機膜がそれぞれ下地である有機膜82との界面に混合層86とを形成する無機膜84であるのが好ましい。
図3に、本発明の製造方法を実施する成膜装置の一例を概念的に示す。なお、図3に示す成膜装置10は、成膜条件が異なるのみで、基本的に、公知のプラズマCVDによるロール・ツー・ロールの成膜装置である。
また、この成膜装置10は、長尺な基板Zをロール状に巻回してなる基板ロール32から基板Zを送り出し、長手方向に搬送しつつ機能膜を成膜して、機能膜を成膜した基板Z(すなわち、機能性フィルム)をロール状に巻き取る、いわゆるロール・ツー・ロール(Roll to Roll)による成膜を行なう装置である。
また、基板Zは、基材Z0の上に有機膜82を形成してなるものである。
ドラム30は、後述する巻出し室14のガイドローラ40aよって所定の経路で案内された基板Zを、周面の所定領域に掛け回して、所定位置に保持しつつ長手方向に搬送して、成膜室18内に搬送して、巻出し室14のガイドローラ40bに送る。
また、ドラム30には、バイアス電源48が接続されている。
バイアス電源48は、基本的に、各種のプラズマCVD装置で利用されている、公知のバイアス電源である。
ここで、本発明のガスバリアフィルムの製造方法において、バイアス電源48がドラム30に供給するバイアス電力は、プラズマ励起電力よりも低い周波数であり、0.1~1MHzである。また、バイアス電源48がドラム30に供給するバイアス電力は、後述する高周波電源60がシャワー電極20に供給するプラズマ励起電力に対して、0.02~0.5倍の電力である。
この点に関しては、後に詳述する。
ここで、隔壁36aおよび36bの先端(真空チャンバ12の内壁面と逆端)は、搬送される基板Zに接触しない可能な位置まで、ドラム30の周面に近接し、巻出し室14と、成膜室18とを、略気密に分離する。
成膜装置10においては、基板ロール32からの基板Zの送り出しと、巻取り軸34における成膜済み基板Zの巻き取りとを同期して行なって、長尺な基板Zを所定の搬送経路で長手方向に搬送しつつ、成膜室18における成膜を行なう。
成膜室18は、内壁面12aと、ドラム30の周面と、内壁面12aからドラム30の周面の近傍まで延在する隔壁36aおよび36bとによって構成される。
成膜装置10において、成膜室18は、CCP(Capacitively Coupled Plasma 容量結合型プラズマ)-CVDによって、基板Zの表面に成膜を行なうものであり、シャワー電極20と、原料ガス供給手段58と、高周波電源60と、真空排気手段62とを有する。
前述のように、シャワー電極20のドラム30との対向面には、多数の貫通穴が供給されている。従って、シャワー電極20に供給された原料ガスは、この貫通穴から、シャワー電極20とドラム30との間に導入される。
さらに、真空排気手段62は、プラズマCVDによるガスバリア膜の成膜のために、成膜室18内を排気して、所定の成膜圧力に保つものである。真空排気手段62は、真空成膜装置に利用されている、公知の真空排気手段である。
また、バイアス電力が、プラズマ励起電力の0.5倍以上の場合には、無機膜の膜密度が高くなりすぎて柔軟性が低下するおそれがある。また、形成される混合層の厚さが厚くなりすぎて、十分な厚さの無機膜が成膜されるまでにより長い時間が必要となるので、成膜レートが低下するおそれがある。
従って、バイアス電力は、プラズマ励起電力の0.02~0.5倍とすることが好ましい。
シランガスとアンモニアガスの流量比を上記範囲とすることで、成膜される無機膜84の膜中のN/Siの組成比を1~1.35とし、膜密度を2.1~2.4g/cm3とすることができる。
従って、シランガスとアンモニアガスの流量比を、SiH4:NH3=1:1.2~1:3.0とすることが好ましい。
CCP-CVD法による成膜を行なう成膜装置10を用いて、本発明の製造方法により、基板Zに窒化シリコン膜である無機膜84(ガスバリア膜)を形成した。
また、原料ガスとして、シランガス(SiH4)、アンモニアガス(NH3)、および水素ガス(H2)を用いた。シランガスの流量は100sccm、アンモニアガスの流量は200sccm、水素ガスの流量は1000sccmとした。すなわち、シランガスとアンモニアガスとの流量比は、1:2とした。
さらに、高周波電源60として、周波数13.56MHzの高周波電源を用い、シャワー電極20に2kWの電力を供給した。
また、バイアス電源48として、周波数0.4MHzの高周波電源を用い、ドラム30に0.2kW(プラズマ励起電力の0.1倍)の電力を供給した。
さらに、真空チャンバ内の圧力が50Paとなるように、真空チャンバ内の排気を調整した。
また、基板Zの搬送速度は、1.0m/minとした。
また、混合層86の厚みを、ガスバリアフィルム80の無機膜84側の表面からエッチングしながら、X線光電子分光装置(島津製作所社製ESCA-3400)を用いて、XPS(X線光電子分光)によって元素分析を行って、シリコンと炭素の有無を観察する方法により求めた。その結果、混合層86の厚みは、15nmであった。
ドラム30に供給されるバイアス電力を0.4kW(プラズマ励起電力の0.2倍)とした以外は、実施例1と同様にして、ガスバリアフィルム80の作製を行った。その後、無機膜84の膜厚、膜密度、組成比、および混合層86の膜厚を測定した。その結果、無機膜84の膜厚は、42.3nmで、膜密度は、2.31g/cm3で、組成比N/Siが1.20で、混合層86の膜厚は、21nmであった。従って、本発明の範囲を満たすものであった。
また、このガスバリアフィルム80について、可視光透過率および水蒸気透過率を測定した。可視光透過率は、87.5%であった。また、水蒸気透過率は、作製直後は、1.9×10-5[g/(m2・day)]で、1000時間放置後は、2.2×10-5[g/(m2・day)]で、曲げ後は、2.4×10-5[g/(m2・day)]であった。
実施例1と同様にして作製したガスバリアフィルム80の表面にアクリレートを主成分とする有機膜82bを形成し、これを基板として、再度、実施例1と同様にして無機膜84bを形成し、図2に示すように有機膜82と無機膜84とが積層されたガスバリアフィルム90を作製した。その後、無機膜84a、84bの膜厚、膜密度、組成比、および混合層86a、86bの膜厚を測定した。その結果、無機膜84aの膜厚は、40.6nmで、膜密度は、2.24g/cm3で、組成比N/Siが1.16で、無機膜84bの膜厚は、38.9nmで、膜密度は、2.21g/cm3で、組成比N/Siが1.12で、混合層86aの膜厚は、14nmで、混合層86bの膜厚は、17nmであった。すなわち、本発明の範囲を満たすものであった。
また、このガスバリアフィルム90について、可視光透過率および水蒸気透過率を測定した。その結果、可視光透過率は、86.6%であった。また、水蒸気透過率は、作製直後は、1.0×10-5以下[g/(m2・day)]で、1000時間放置後は、1.0×10-5以下[g/(m2・day)]で、曲げ後は、1.0×10-5以下[g/(m2・day)]であった。
ドラム30にバイアス電力を供給しない(0kW)以外は、実施例1と同様にして、ガスバリアフィルムの作製を行った。その後、無機膜の膜厚、膜密度、組成比、および混合層の膜厚を測定した。その結果、無機膜の膜厚は、40.1nmで、膜密度は、2.02g/cm3で、組成比N/Siが1.05で、混合層86の膜厚は、3nmであった。すなわち、本発明の範囲を満たさないものであった。
このガスバリアフィルムについて、可視光透過率および水蒸気透過率を測定した。その結果、可視光透過率は、85.5%であった。また、水蒸気透過率は、作製直後は、4.7×10-4[g/(m2・day)]で、1000時間放置後は、8.0×10-3[g/(m2・day)]で、曲げ後は、3.6×10-3[g/(m2・day)]であった。
アンモニアガスの流量を320sccmとし、シランガスとアンモニアガスとの流量比を1:3.2とした以外は、実施例1と同様にして、ガスバリアフィルムの作製を行った。その後、無機膜の膜厚、膜密度、組成比、および混合層の膜厚を測定した。その結果、無機膜の膜厚は、38.6nmで、膜密度は、2.27g/cm3で、組成比N/Siが1.37で、混合層86の膜厚は、17nmであった。すなわち、本発明の範囲を満たさないものであった。
このガスバリアフィルムについて、可視光透過率および水蒸気透過率を測定した。その結果、可視光透過率は、89.2%であった。また、水蒸気透過率は、作製直後は、4.8×10-5[g/(m2・day)]で、1000時間放置後は、1.5×10-4[g/(m2・day)]で、曲げ後は、2.3×10-3[g/(m2・day)]であった。
アンモニアガスの流量を100sccmとし、シランガスとアンモニアガスとの流量比を1:1とした以外は、実施例1と同様にして、ガスバリアフィルムの作製を行った。その後、無機膜の膜厚、膜密度、組成比、および混合層の膜厚を測定した。その後、無機膜の膜厚は、39.5nmで、膜密度は、2.18g/cm3で、組成比N/Siが0.97で、混合層86の膜厚は、12nmであった。すなわち、本発明の範囲を満たさないものであった。
このガスバリアフィルムについて、可視光透過率および水蒸気透過率を測定した。その結果、可視光透過率は、83.8%であった。また、水蒸気透過率は、作製直後は、3.9×10-5[g/(m2・day)]で、1000時間放置後は、4.6×10-5[g/(m2・day)]で、曲げ後は、4.4×10-5[g/(m2・day)]であった。
搬送速度を0.7m/minとした以外は、実施例1と同様にして、ガスバリアフィルムの作製を行った。その後、無機膜の膜厚、膜密度、組成比、および混合層の膜厚を測定した。その結果、無機膜の膜厚は、68.7nmで、膜密度は、2.25g/cm3で、組成比N/Siが1.14で、混合層86の膜厚は、17nmであった。すなわち、本発明の範囲を満たさないものであった。
このガスバリアフィルムについて、可視光透過率および水蒸気透過率を測定した。その結果、可視光透過率は、86.0%であった。また、水蒸気透過率は、作製直後は、1.6×10-5[g/(m2・day)]で、1000時間放置後は、2.0×10-5[g/(m2・day)]で、曲げ後は、4.7×10-3[g/(m2・day)]であった。
ドラムに供給されるバイアス電力を1.1kW(プラズマ励起電力の0.55倍)とした以外は、実施例1と同様にして、ガスバリアフィルムの作製を行った。その後、無機膜の膜厚、膜密度、組成比、および混合層の膜厚を測定した。その結果、無機膜の膜厚は、32.1nmで、膜密度は、2.44g/cm3で、組成比N/Siが1.27で、混合層86の膜厚は、43nmであった。すなわち、本発明の範囲を満たさないものであった。
このガスバリアフィルムについて、可視光透過率および水蒸気透過率を測定した。その結果、可視光透過率は、88.1%であった。また、水蒸気透過率は、作製直後は、2.3×10-5[g/(m2・day)]で、1000時間放置後は、3.5×10-5[g/(m2・day)]で、曲げ後は、7.1×10-4[g/(m2・day)]であった。
測定結果を表1に示す。
また、比較例2は、1000時間後および繰り返し曲げ後のガスバリア性が低下している。比較例2から、組成比N/Siが高いと、経時によりバリア膜が酸化して低密度化するので耐久性が低くなってしまうことがわかる。また、柔軟性が低下してしまうことがわかる。また、成膜時のシランガスに対するアンモニアガスの流量比が高くなると、組成比N/Siが高くなりすぎることがわかる。
また、比較例3から、組成比N/Siが低いと、透過率が低下することがわかる。また、成膜時のシランガスに対するアンモニアガスの流量比が低くなると、組成比N/Siが低くなりすぎることがわかる。
また、比較例5から、無機膜の膜密度が高くなると、柔軟性が低下し、繰り返し曲げ後のガスバリア性が低下することがわかる。また、バイアス電力の比率を高くすると無機膜の膜密度が高くなることがわかる。
以上の結果より、本発明の効果は、明らかである。
12 真空チャンバ
12a 内壁面
14 巻出し室
18 成膜室
20 シャワー電極
30 ドラム
32 基板ロール
34 巻取り軸
36a、36b 隔壁
40a、40b ガイドローラ
42 回転軸
46、62 真空排気手段
48 バイアス電源
58 原料ガス供給手段
60 高周波電源
80、90 ガスバリアフィルム
82 有機膜
84 無機膜
86 混合層
Z 基板
Z0 基材
Claims (6)
- 有機材料からなる表面を有する基板と、前記基板上に形成された窒化ケイ素を主成分とする無機膜とを有するガスバリアフィルムであって、
前記無機膜は、膜中の窒素とケイ素との組成比N/Siが1.00~1.35であり、膜密度が2.1~2.4g/cm3であり、膜厚が10~60nmであり、
前記基板と前記無機膜との界面に形成された、前記有機材料と前記無機膜とに由来する成分を含有する混合層の厚みが5~40nmであることを特徴とするガスバリアフィルム。 - さらに、前記無機膜の上に形成される有機膜と、前記有機膜の上に形成される無機膜とを有する請求項1に記載のガスバリアフィルム。
- 前記基板は、有機膜と無機膜とを交互に形成してなる層を有する請求項1または2に記載のガスバリアフィルム。
- 請求項1~3のいずれかに記載のガスバリアフィルムの製造方法であって、
有機材料からなる表面を有する長尺な基板を長手方向に搬送しつつ、搬送される前記基板を挟むように配置された電極対を有する成膜手段を用いて容量結合型プラズマCVDによって、前記基板に窒化ケイ素を主成分とする無機膜を成膜するものであり、
前記電極対の一方の電極には、10~100MHzの高周波のプラズマ励起電力を供給し、かつ、他方の電極には、前記プラズマ励起電力よりも低い0.1~1MHzの周波数で、前記プラズマ励起電力の0.02~0.5倍のバイアス電力を供給して成膜を行うガスバリアフィルムの製造方法。 - 前記無機膜を成膜するための原料ガスは、シランガスとアンモニアガスとを含み、シランガスとアンモニアガスとのガスの流量比は、SiH4:NH3=1:1.2~1:3.0である請求項4に記載のガスバリアフィルムの製造方法。
- 前記無機膜を成膜する際の成膜圧力を10~80Paとする請求項4または5に記載のガスバリアフィルムの製造方法。
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WO2015080397A1 (ko) * | 2013-11-29 | 2015-06-04 | 삼성에스디아이 주식회사 | 가스 배리어 필름 및 그 제조방법 |
US9891473B2 (en) | 2012-03-27 | 2018-02-13 | Sumitomo Chemical Company, Limited | Laminated film, organic electroluminescence device, photoelectric converter, and liquid crystal display |
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CN104846350A (zh) * | 2014-02-18 | 2015-08-19 | 中国科学院苏州纳米技术与纳米仿生研究所 | 一种有机无机杂化的高阻隔膜及其制备方法 |
JP6019054B2 (ja) | 2014-03-24 | 2016-11-02 | 富士フイルム株式会社 | ガスバリアフィルムおよびガスバリアフィルムの製造方法 |
JP6042840B2 (ja) * | 2014-03-27 | 2016-12-14 | 富士フイルム株式会社 | 機能性フィルムおよび機能性フィルムの製造方法 |
KR102182521B1 (ko) | 2014-12-30 | 2020-11-24 | 코오롱글로텍주식회사 | 고유연성 배리어 섬유기판 및 그의 제조방법 |
JP6414707B2 (ja) * | 2016-03-29 | 2018-10-31 | 大陽日酸株式会社 | ガスバリア性樹脂基材の製造方法 |
WO2019065020A1 (ja) * | 2017-09-27 | 2019-04-04 | 富士フイルム株式会社 | ガスバリアフィルム |
KR102139077B1 (ko) * | 2018-05-03 | 2020-07-29 | 한국화학연구원 | 기체 차단용 필름 및 이의 제조방법 |
DE102018116756A1 (de) * | 2018-07-11 | 2020-01-16 | Hanwha Q Cells Gmbh | Haltevorrichtung, Verfahren zur Beschichtung einer Haltevorrichtung und Verwendung der Haltevorrichtung |
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- 2013-02-19 KR KR20147025806A patent/KR20140127882A/ko not_active Application Discontinuation
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TWI567219B (zh) | 2017-01-21 |
JP2013203050A (ja) | 2013-10-07 |
US20150050478A1 (en) | 2015-02-19 |
KR20140127882A (ko) | 2014-11-04 |
JP5730235B2 (ja) | 2015-06-03 |
TW201339350A (zh) | 2013-10-01 |
CN104203562B (zh) | 2016-03-16 |
CN104203562A (zh) | 2014-12-10 |
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