Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
  • B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
• • 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
  • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
  • G02B1/14—Protective coatings, e.g. hard coatings

Definitions

• the present invention relates to a hard coat film, and more specifically to a hard coat film provided with a hard coat layer that can be used as a component for flat panel displays such as liquid crystal display devices, plasma display devices, and electroluminescence (EL) display devices, touch panels, and the like, as well as a carrier film, a base film for flexible substrates, and the like.
• a hard coat film provided with a hard coat layer that can be used as a component for flat panel displays such as liquid crystal display devices, plasma display devices, and electroluminescence (EL) display devices, touch panels, and the like, as well as a carrier film, a base film for flexible substrates, and the like.
• flat panel displays such as liquid crystal display devices, plasma display devices, and electroluminescence (EL) display devices, touch panels, and the like
• EL electroluminescence
• the display surface of flat panel displays such as liquid crystal displays (LCDs) must be scratch-resistant to prevent scratches during handling and loss of visibility. For this reason, scratch resistance is commonly imparted by using a hard coat film, which is a base film with a hard coat layer.
• a hard coat film which is a base film with a hard coat layer.
• touch panels which allow users to input data and instructions by touching the display screen with a finger or pen while viewing the display, has led to increased functional demands for hard coat films that suppress whitening of the appearance and have high total light transmittance and low haze.
• polyethylene terephthalate, polyethylene naphthalate, triacetyl cellulose, cycloolefin, which have excellent transparency, heat resistance, dimensional stability, and low moisture absorption properties, as well as polyimide and liquid crystal polymer, which have even better dimensional stability, are expected to be used as substrate films in optical and electronic component applications.
• hard-coated films which have a hard-coat layer provided on top of such substrate films to further impart hardness, are required to not only have excellent adhesion between the substrate film and the hard-coat layer, but also excellent optical properties, heat resistance, and adhesion to laminated films.
• Patent Document 1 discloses a method of subjecting the surface of the base film to corona treatment, plasma treatment, UV treatment, etc.
• Patent Document 2 discloses applying an anchor coating agent to the base film (anchor coating treatment).
• base films for flexible substrates and the like are required to have high heat resistance (dimensional stability) and flexibility.
• the film after heat treatment, the film must not deteriorate in appearance, change in shape, or change in optical properties (e.g. haze), and it must not crack when folded.
• the present invention aims to provide a hard coat film that has high heat resistance and dimensional stability, suppresses deterioration of appearance and changes in shape after heat treatment, and also has excellent optical properties and flexibility, and a method for producing the same.
• the hard coat film has a hard coat layer containing an ionizing radiation curable resin composition provided on each of both sides of a base film, and is characterized in that the hard coat film satisfies the following conditions (I), (II), (III), and (IV).
• the hard coat film has a ⁇ haze defined by the following formula after being heat-treated at 150 to 200° C. for 1 to 30 minutes, which is within a range of 1.0% or less, and the heat treatment does not cause whitening or deformation in appearance.
• ⁇ haze (%) (haze of the hard coat film after heat treatment) ⁇ (haze of the hard coat film before heat treatment)
• the hard coat film according to the first aspect of the present invention is characterized in that the content of the inorganic or organic fine particles is in the range of 1 to 60 mass % based on the solid content of the ionizing radiation curable resin composition.
• the hard coat film according to the first or second invention is characterized in that, when the thickness of the hard coat layer A on one side of the base film is D A and the thickness of the hard coat layer B on the other side is D B , the thicknesses D A and D B of the hard coat layers A and B are both in the range of 0.5 to 12.0 ⁇ m.
• the hard coat film according to the first or second invention is characterized in that, when the thickness of the hard coat layer A on one side of the base film is D A and the thickness of the hard coat layer B on the other side is D B , the thickness ratio of the hard coat layer A to the hard coat layer B ((D A /D B ) ⁇ 100) is in the range of 50 to 150%.
• the hard coat film according to the first or second aspect of the present invention is characterized in that the base film is any film selected from the group consisting of polyethylene terephthalate, cycloolefin, polyethylene naphthalate, polyimide, triacetyl cellulose, and liquid crystal polymer.
• a method for producing a hard coat film having a hard coat layer containing an ionizing radiation curable resin composition provided on each side of a base film comprising the steps of: coating each side of the base film with an ionizing radiation curable resin composition containing an acrylic resin containing a (meth)acryloyl group, and inorganic or organic fine particles; drying the coated film, and irradiating the coated film with ionizing radiation to form a cured hard coat layer on each side of the base film; and annealing the resulting hard coat film.
• the annealing treatment is carried out at 150 to 200° C. for 0.1 to 40 minutes.
• the hard coat film has a ⁇ haze defined by the following formula within a range of 1.0% or less, and is characterized in that whitening or deformation does not occur in the appearance even when the annealing treatment is performed.
• ⁇ haze (%) (haze of the hard coat film after the annealing treatment) ⁇ (haze of the hard coat film before the annealing treatment)
• the method for producing a hard coat film according to the sixth or seventh invention is characterized in that the hard coat film satisfies the following conditions (III) and (IV).
• ⁇ haze (%) (haze of the hard coat film after heat treatment) ⁇ (haze of the hard coat film before heat treatment)
• the method for producing a hard coat film according to the sixth or seventh invention is characterized in that the content of the inorganic fine particles or organic fine particles is in the range of 1 to 60 mass % relative to the solid content of the ionizing radiation curable resin composition.
• the method for producing a hard coat film according to the sixth or seventh invention is characterized in that the base film is any film selected from polyethylene terephthalate, cycloolefin, polyethylene naphthalate, polyimide, triacetyl cellulose, and liquid crystal polymer.
• a hard coat film which has high heat resistance and dimensional stability, is suppressed from deteriorating in appearance and changing in shape after heat treatment, and further has excellent optical properties and flexibility. Furthermore, according to the method for producing a hard coat film of the present invention, a hard coat film having the above-mentioned various excellent properties can be obtained, particularly by carrying out an annealing treatment after hard coating.
• the present invention is a hard coat film having a hard coat layer containing an ionizing radiation curable resin composition provided on each of both sides of a base film, the hard coat film being characterized in that it satisfies the following conditions (I), (II), (III), and (IV):
• the hard coat film has a ⁇ haze defined by the following formula after being heat-treated at 150 to 200° C. for 1 to 30 minutes, which is within a range of 1.0% or less, and the heat treatment does not cause whitening or deformation in appearance.
• ⁇ haze (%) (haze of the hard coat film after heat treatment) ⁇ (haze of the hard coat film before heat treatment)
• the substrate film of the hard coat film is not particularly limited, and examples thereof include films or sheets of polyethylene terephthalate, cycloolefin, polyethylene naphthalate, polyimide, polyethylene, polypropylene, acrylic resin, polystyrene, triacetyl cellulose, polyvinyl chloride, liquid crystal polymer, etc.
• polyethylene terephthalate, cycloolefin, polyethylene naphthalate, polyimide, triacetyl cellulose, and liquid crystal polymer which are excellent in heat resistance and dimensional stability, and among these, polyethylene terephthalate, which is inexpensive and highly available, and cycloolefin, which is excellent in optical properties and low moisture absorption, are more preferable.
• the thickness of the substrate film is appropriately selected depending on the application for which the hard coat film is to be used, but from the viewpoints of mechanical strength, handling properties, etc., it is preferably in the range of 10 to 300 ⁇ m, and more preferably in the range of 20 to 200 ⁇ m.
• a resin that is a mixture of the resin that constitutes the base film and an ultraviolet absorber may be kneaded and formed into a film, or a film may be used in which a paint that is a mixture of a thermoplastic or thermosetting resin and an ultraviolet absorber is applied to one or both sides of the base film.
• the hard coat layer contains an ionizing radiation curable resin composition and is formed of a cured coating film of the ionizing radiation curable resin composition.
• the resin contained in the hard coat layer it is preferable to use an ionizing radiation curable resin composition, in particular, because it imparts surface hardness (pencil hardness, scratch resistance) to the hard coat layer and also makes it possible to adjust the degree of crosslinking by the amount of exposure to ultraviolet light, thereby enabling adjustment of the surface hardness of the hard coat layer.
• the ionizing radiation curable resin composition contains an acrylic resin containing a (meth)acryloyl group (the above condition (I)).
• the ionizing radiation curable resin composition used in the present invention is a transparent resin that is cured by irradiation with ultraviolet light (hereinafter abbreviated as "UV") or an electron beam (hereinafter abbreviated as "EB"), and preferably contains an acrylic resin containing a (meth)acryloyl group, and particularly preferably contains a polyfunctional acrylate resin having three or more (meth)acryloyloxy groups in one molecule in order to improve the coating hardness and form a three-dimensional crosslinked structure in the hard coat layer, and more preferably contains a urethane acrylate resin containing a (meth)acryloyl group.
• UV ultraviolet light
• EB electron beam
• polyfunctional acrylates having three or more (meth)acryloyl groups in one molecule include urethane acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, dipentaerythritol hexa(meth)acrylate, trimethylolpropane ethoxy triacrylate, glycerin propoxy triacrylate, and ditrimethylolpropane tetraacrylate.
• the acrylic resin containing a (meth)acryloyl group may be used not only as a single type but also as a mixture of two or more types of acrylic resins.
• the ionizing radiation curable resin composition used in the present invention further contains inorganic or organic fine particles (condition (II) above).
• inorganic or organic fine particles By including these inorganic or organic fine particles, it is possible to improve the surface hardness (scratch resistance) and surface smoothness of the hard coat layer. Furthermore, as described above, it also contributes to improving the heat resistance of the hard coat film.
• the average particle diameter of the inorganic or organic fine particles is preferably in the range of 1 to 500 nm, and more preferably in the range of 10 to 100 nm. If the average particle diameter is less than 1 nm, it is difficult to obtain sufficient surface hardness. On the other hand, if the average particle diameter exceeds 500 nm, the gloss and transparency of the hard coat layer may decrease, and the flexibility may also decrease.
• the inorganic or organic fine particles include silica, alumina, acrylic, and silicone resin fine particles.
• the hard coat film contains silica, which is an inorganic fine particle that provides an excellent appearance, has very high binding energy, and is excellent in thermal stability.
• the content of the inorganic or organic fine particles is preferably in the range of 1 to 60% by mass, and more preferably in the range of 15 to 50% by mass, based on the solid content of the ionizing radiation curable resin composition. If the content is less than 1% by mass, it is difficult to obtain the effect of improving the surface hardness (scratch resistance) and the effect of improving the heat resistance. On the other hand, if the content exceeds 60% by mass, it is not preferable because the flexibility decreases and the haze increases.
• the ionizing radiation curable resin composition may contain thermoplastic resins such as polyethylene, polypropylene, polystyrene, polycarbonate, polyester, styrene-acrylic, and cellulose, and thermosetting resins such as phenolic resin, urea resin, unsaturated polyester, epoxy, and silicone resin, within a range that does not impair the effects of the present invention or the hardness and scratch resistance of the hard coat layer.
• thermoplastic resins such as polyethylene, polypropylene, polystyrene, polycarbonate, polyester, styrene-acrylic, and cellulose
• thermosetting resins such as phenolic resin, urea resin, unsaturated polyester, epoxy, and silicone resin
• the photopolymerization initiator for the ionizing radiation curable resin composition is not particularly limited and may be acetophenones such as commercially available Omnirad 651 or Omnirad 184 (both product names: manufactured by IMG) or benzophenones such as Omnirad 500 (product name: manufactured by IMG).
• the hard coat film of the present invention is a hard coat film in which a hard coat layer is formed on each side of a substrate film using an ionizing radiation curable resin composition that satisfies the above-mentioned conditions.
• a leveling agent can be used in the hard coat layer to improve the coating properties, and known leveling agents such as fluorine-based, acrylic, siloxane-based, and their adducts or mixtures can be used.
• the blending amount can be in the range of 0.01 to 7 parts by mass per 100 parts by mass of the solid content of the resin of the hard coat layer.
• OCR optically transparent resin
• TSP transparent conductive member
• LCD liquid crystal module
• additives that may be added to the hard coat layer as necessary include defoamers, surface tension regulators, antifouling agents, antioxidants, antistatic agents, UV absorbers, light stabilizers, etc., within the scope of not impairing the effects of the present invention.
• the hard coat layer is formed by applying a coating material in which the ionizing radiation curable resin composition, photopolymerization initiator, and other additives are dissolved and dispersed in a suitable solvent onto the substrate film and then drying.
• the solvent can be appropriately selected according to the solubility of the resin to be blended, and any solvent can be used as long as it can uniformly dissolve or disperse at least the solids (resin, photopolymerization initiator, and other additives).
• solvents examples include known organic solvents such as aromatic solvents such as toluene, xylene, and n-heptane; aliphatic solvents such as cyclohexane, methylcyclohexane, and ethylcyclohexane; ester solvents such as methyl acetate, ethyl acetate, propyl acetate, isopropyl acetate, butyl acetate, and methyl lactate; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclohexanone; and alcohol solvents such as methanol, ethanol, isopropyl alcohol, and n-propyl alcohol. These solvents can be used alone or in combination.
• aromatic solvents such as toluene, xylene, and n-heptane
• aliphatic solvents such as cyclohexane, methylcyclohe
• the method for applying the hard coat layer is usually applied using a known coating method such as gravure coating, microgravure coating, fountain bar coating, slide die coating, slot die coating, spin coating, screen printing, or spray coating, and then dried at a temperature of about 50 to 120°C.
• a known coating method such as gravure coating, microgravure coating, fountain bar coating, slide die coating, slot die coating, spin coating, screen printing, or spray coating, and then dried at a temperature of about 50 to 120°C.
• a hard coat layer coating material containing the above-mentioned ionizing radiation curable resin composition or the like is applied to a substrate film, dried, and then irradiated with ionizing radiation (UV, EB, or the like), whereby photopolymerization occurs to obtain a cured coating film (hard coat layer) with excellent hardness.
• ionizing radiation UV, EB, or the like
• the amount of ionizing radiation (UV, EB, or the like) irradiated to the coating film after drying may be an amount necessary to impart such sufficient hardness to the hard coat layer, and can be appropriately set depending on the type of ionizing radiation curable resin, etc.
• the hard coat film of the present invention is a hard coat film in which a hard coat layer is provided on each side of a substrate film.
• the thickness of the hard coat layer is not particularly limited, but when the thickness of the hard coat layer A on one side of the substrate film is D A and the thickness of the hard coat layer B on the other side is D B , the thicknesses D A and D B of the hard coat layers A and B are preferably in the range of 0.5 to 12.0 ⁇ m, and particularly preferably in the range of 0.5 to 9.0 ⁇ m. If the thickness is less than 0.5 ⁇ m, sufficient rigidity cannot be obtained for the hard coat layer, and it becomes difficult to suppress the thermal deformation of the substrate film by the hard coat layer.
• the thickness exceeds 12.0 ⁇ m, the rigidity of the hard coat layer is significantly improved, and the bending property and crack resistance of the hard coat layer are significantly reduced, which is not preferable.
• the thickness (one side) is in the range of 1.0 to 7.0 ⁇ m.
• the film thickness ratio ((D A /D B ) ⁇ 100) of the hard coat layer A to the hard coat layer B is preferably in the range of 50 to 150%, particularly preferably in the range of 80 to 120%.
• the film thickness ratio of the hard coat layer A to the hard coat layer B is in the above ratio, curling of the hard coat layers A and B due to cure shrinkage is offset, which is preferable.
• the hard coat film of the present invention has a maximum heat shrinkage of 1.2% or less after heat treatment at 150 to 200° C. for 1 to 30 minutes, and a flexibility of 7 mm or less (condition (III) above). Furthermore, the hard coat film of the present invention has a ⁇ haze defined by the following formula after the hard coat film is heat-treated at 150 to 200° C. for 1 to 30 minutes in the range of 1.0% or less, and does not suffer from whitening or deformation in appearance even after the heat treatment (condition (IV) above).
• ⁇ haze (%) (haze of the hard coat film after heat treatment) ⁇ (haze of the hard coat film before heat treatment)
• the hard coat film of the present invention satisfies the above conditions (III) and (IV) and has high heat resistance, dimensional stability, and flexibility. Therefore, in the film after the above heat treatment, for example, deterioration of the appearance, change in shape, etc. are suppressed, and changes in optical properties (e.g. haze, etc.) are also suppressed, and cracks, etc. do not occur when the film is folded.
• the present invention also provides a method for producing a hard coat film.
• the method for producing a hard coat film of the present invention is characterized in that an ionizing radiation curable resin composition containing an acrylic resin having a (meth)acryloyl group and inorganic or organic fine particles is applied to both sides of the base film, dried, and then irradiated with ionizing radiation to form a cured hard coat layer on each side of the base film, and the obtained hard coat film is subjected to an annealing treatment.
• the ionizing radiation curable resin composition containing the acrylic resin containing the (meth)acryloyl group and inorganic or organic fine particles is as described above.
• the method for producing a hard-coated film of the present invention is characterized in that after hard-coating, that is, after forming a hard-coat layer on each side of the base film, the resulting hard-coated film is annealed.
• Annealing is a method of removing residual stress in a film by heat treatment. By performing annealing, the molecules are completely crystallized and fixed, improving heat resistance, dimensional stability, etc.
• Annealing is preferably performed at a high temperature for a short period of time, preferably no longer than about 40 minutes. In the present invention, annealing is preferably performed at 150 to 200°C for 0.1 to 40 minutes, and particularly 0.1 to 30 minutes.
• the hard coat film has a ⁇ haze defined by the following formula within a range of 1.0% or less, and does not suffer from whitening or deformation in appearance even when subjected to the annealing treatment.
• ⁇ haze (%) (haze of hard coat film after annealing treatment) - (haze of hard coat film before annealing treatment)
• the hard-coated film obtained by the hard-coated film manufacturing method of the present invention has a maximum heat shrinkage of 1.2% or less and a flexibility of 7 mm or less after the hard-coated film is heat-treated at 150 to 200° C. for 1 to 30 minutes. Furthermore, the hard-coated film obtained by the hard-coated film manufacturing method of the present invention has a ⁇ haze defined by the following formula in the range of 1.0% or less after the hard-coated film is heat-treated at 150 to 200° C. for 1 to 30 minutes, and does not whiten or deform in appearance even when heat-treated.
• ⁇ haze (%) (haze of the hard coat film after heat treatment) ⁇ (haze of the hard coat film before heat treatment)
• the method for producing a hard coat film of the present invention is suitable for producing a hard coat film of the present invention that has the various excellent properties described above.
• the present invention provides a hard coat film having a hard coat layer containing an ionizing radiation curable resin composition provided on each of both sides of a base film, the hard coat film satisfying the above-mentioned conditions (I), (II), (III) and (IV).
• a hard coat film that has high heat resistance and dimensional stability, is suppressed from deteriorating in appearance and changing in shape after heat treatment, and is also excellent in optical properties and flexibility.
• a hard coat film having the above-mentioned various excellent properties can be obtained, particularly by carrying out an annealing treatment after hard coating.
• Example 1 Preparation of hard coat layer-forming resin composition (hard coat layer coating material) 1]
• the main component was an ionizing radiation curable resin composition (containing 23% in total of urethane acrylate and acrylic ester containing (meth)acryloyl groups, 15% amorphous silica, 2% photopolymerization initiator, and containing 41.7% propylene glycol monomethyl ether, 3.5% methyl isobutyl ketone, 36.7% methyl ethyl tonne, and 18.2% toluene as solvents), to which a fluorine-based leveling agent was added at a resin ratio of 0.1%, and the solids concentration was adjusted to 28% with a diluent (a mixture of 65% 1-propanol and 35% diacetone alcohol).
• a hard coat layer-forming resin composition 1 used in this example was prepared.
• a substrate film mainly composed of polyethylene terephthalate (trade name "Cosmoshine A4360", thickness 125 ⁇ m, manufactured by Toyobo Co., Ltd.) was used as the substrate film, and the above-mentioned hard coat layer forming resin composition 1 was applied to both sides of this substrate film using a bar coater, and dried with hot air in a drying oven at 80° C. for 1 minute to form a coating layer having a coating thickness of 3.0 ⁇ m (one side).
• the coating thickness was the same on both sides.
• the coating thickness was measured using a Thin-Film Analyzer F20 (trade name) (manufactured by FILMETRICS Co., Ltd.).
• the obtained hard coat film was heat-treated in a drying furnace at 150 to 200°C for 1 to 30 minutes to obtain an annealed hard coat film.
• the specific annealing conditions were as shown in Table 1.
• Example 1 In the same manner as in Example 1, a hard coat layer was formed on each side of the above-mentioned substrate film, and a hard coat film not subjected to annealing treatment was prepared by omitting the subsequent annealing treatment.
• Example 2 The above-mentioned substrate film was annealed in a drying oven at 150 to 200° C. for 1 to 30 minutes, and a hard coat layer similar to that in Example 1 was formed on each side of the substrate film to prepare a hard coat film.
• the specific annealing conditions for the substrate film were as shown in Table 1.
• Reference Example 1 As Reference Example 1, the following evaluation was also carried out on the substrate film (product name "Cosmoshine A4360", thickness 125 ⁇ m, manufactured by Toyobo Co., Ltd.) mainly composed of polyethylene terephthalate used in the above Examples and Comparative Examples.
• Reference Example 2 As Reference Example 2, the substrate film of Reference Example 1 was annealed in a drying oven at 150 to 200° C. for 1 to 30 minutes to prepare a substrate film, and the following evaluations were performed.
• the specific annealing conditions for the substrate film were as shown in Table 1.
• Optical properties (transmittance (Tt), haze, ⁇ haze) Measurements were made using a haze meter HM150 (manufactured by Murakami Color Research Laboratory Co., Ltd.) in accordance with JIS-K-7361-1 and JIS-K-7136. Measurements were made on each film before and after heat treatment (heat treatment at 150°C for 30 minutes and at 200°C for 30 minutes).
• the ⁇ haze defined by the following formula 1 is also shown in the "Optical properties after each heat treatment" column in Table 1.
• ⁇ haze defined by the following formula 2
• ⁇ haze (haze of hard coat film or base film after annealing treatment) - (haze of hard coat film or base film before annealing treatment)
• ⁇ haze (%) (haze of hard coat film after annealing (value after annealing + coating)) ⁇ (haze of base film before annealing) is shown in Table 1.
• the hard coat film of the present invention example satisfies the conditions (I), (II), (III) and (IV) of the present invention, and has high heat resistance, dimensional stability and flexibility. Therefore, in the film after the above-mentioned heat treatment, for example, deterioration of appearance, change in shape, etc. are suppressed, and changes in optical properties (transmittance, haze, etc.) are also suppressed. That is, according to the present invention, a hard coat film having high heat resistance and dimensional stability, deterioration of appearance and change in shape after heat treatment are suppressed, and further excellent optical properties and flexibility can be obtained.
• the manufacturing method of the hard coat film of the present invention which performs annealing treatment after the hard coat, is suitable for manufacturing the hard coat film of the present invention having the above-mentioned various excellent properties.
• the hard-coated film of Comparative Example 1, which is not annealed, and the hard-coated film of Comparative Example 2, which is hard-coated after annealing do not satisfy all of the conditions (I), (II), (III) and (IV) of the present invention, and a hard-coated film that satisfies all of high heat resistance, dimensional stability, appearance after heat treatment, optical properties and flexibility cannot be obtained. Also, whitening and deformation were observed in the reference example.

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