WO2011007729A1 - 透明フィルムおよび該フィルムを用いた表面保護フィルム - Google Patents
透明フィルムおよび該フィルムを用いた表面保護フィルム Download PDFInfo
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- WO2011007729A1 WO2011007729A1 PCT/JP2010/061695 JP2010061695W WO2011007729A1 WO 2011007729 A1 WO2011007729 A1 WO 2011007729A1 JP 2010061695 W JP2010061695 W JP 2010061695W WO 2011007729 A1 WO2011007729 A1 WO 2011007729A1
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- layer
- transparent film
- back layer
- base material
- resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—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
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
-
- 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
-
- 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
- G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
- C08G2261/32—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain
- C08G2261/322—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed
- C08G2261/3221—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed containing one or more nitrogen atoms as the only heteroatom, e.g. pyrrole, pyridine or triazole
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2261/00—Macromolecular compounds obtained by reactions forming a carbon-to-carbon link in the main chain of the macromolecule
- C08G2261/30—Monomer units or repeat units incorporating structural elements in the main chain
- C08G2261/32—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain
- C08G2261/322—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed
- C08G2261/3223—Monomer units or repeat units incorporating structural elements in the main chain incorporating heteroaromatic structural elements in the main chain non-condensed containing one or more sulfur atoms as the only heteroatom, e.g. thiophene
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2467/00—Presence of polyester
- C09J2467/006—Presence of polyester in the substrate
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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
- Y10T428/24983—Hardness
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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
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a transparent film that is less likely to be scratched on the back surface and a surface protective film including the film.
- the surface protective film (also referred to as a surface protective sheet) generally has a configuration in which an adhesive is provided on a film-like support. Such a protective film is attached to an adherend via the pressure-sensitive adhesive, and is used for the purpose of protecting the adherend from scratches and dirt during processing and transportation.
- a polarizing plate to be bonded to a liquid crystal cell in the production of a liquid crystal display panel is once manufactured in a roll form, and then unwound from the roll and cut into a desired size according to the shape of the liquid crystal cell.
- a film having transparency can be preferably used since an appearance inspection of an adherend (for example, a polarizing plate) can be performed with the film attached.
- an appearance inspection of an adherend for example, a polarizing plate
- the required level for the appearance quality of the surface protection film has been increased from the viewpoint of the ease of appearance inspection.
- the property that the back surface of the surface protective film (the surface opposite to the surface attached to the adherend) is not easily scratched. This is because if the surface protective film has scratches, it cannot be determined whether the surface protective film is attached to the adherend or the surface protective film.
- an object of the present invention is to provide a transparent film that is hardly scratched on the back surface (that is, excellent in scratch resistance) and is therefore suitable for use as a support for a surface protective film.
- Another object of the present invention is to provide a surface protective film having a structure having an adhesive layer on one side of the transparent film.
- the transparent film provided by the present invention has a base material layer made of a transparent resin material and a back surface layer provided on the first surface of the base material layer.
- the back layer has a thickness of 1 ⁇ m or less.
- the fracture start load of the back layer in the scratch test is 50 mN or more, and the friction coefficient of the back layer is 0.4 or less.
- the transparent film having such a configuration it is possible to impart good scratch resistance to the base material layer using the back layer.
- the transparent film excellent in scratch resistance is suitable as a support for the surface protective film because it can accurately inspect the appearance of the product through the film.
- the said back layer is small in thickness, it has little influence on the characteristics (optical characteristics, dimensional stability, etc.) of the base material layer, and is preferable.
- the thickness of the back layer is more than 1 ⁇ m, when the back layer contains components that are easily colored, the coloring of the entire transparent film becomes conspicuous, or curing shrinkage occurs with the formation of the back layer Further, the shrinkage may cause the transparent film to be easily curled.
- the thickness of the back layer is also preferable to reduce the thickness of the back layer within a range in which desired performance (for example, scratch resistance) is achieved, from the viewpoint that the above-described coloring and curling can be prevented or reduced.
- a material using a polyester resin such as polyethylene terephthalate resin or polyethylene naphthalate resin as a base resin can be preferably used.
- the ratio (Ps / Pb; hereinafter referred to as “plastic index ratio”) of the plastic index Ps of the back surface layer of the transparent film and the plastic index Pb of the base material layer. ) Is 1.5 or more (that is, Ps / Pb ⁇ 1.5).
- the plastic index Ps of the back layer is measured by indenting elastic modulus and hardness at a depth of 10 nm by vertically pushing a barco pitch type diamond indenter with a radius of curvature of 0.1 ⁇ m into the back layer constituting the transparent film. The modulus of elasticity is obtained by dividing by the hardness.
- the plastic index ratio of the base material layer is determined by measuring the indentation elastic modulus and hardness at a depth of 10 nm by pressing the indenter vertically into the base material layer having no back layer, and dividing the elastic modulus by the hardness. Desired.
- a transparent film satisfying the above plastic index ratio has a plastic index larger than that of the base layer when the base layer is deformed when the scratch stress applied from above the back layer is applied to the base layer.
- the substrate layer can be deformed by following the deformation of the base material layer. This prevents the back layer from being damaged by the fretting stress (that is, the breaking start load becomes high), so that a transparent film satisfying the breaking start load and excellent in scratch resistance can be appropriately realized.
- the transparent film disclosed herein has a peeling force measured by applying an adhesive tape to the back layer, and peeling the adhesive tape from the back layer at a peeling speed of 0.3 m / min and a peeling angle of 180 degrees. It is preferable that (back surface peeling force) is 2 N / 19 mm or more.
- a transparent film exhibiting such peeling force is suitable as a support for the surface protective film. That is, the surface protective film that has finished its protective function is removed by peeling off from the adherend (for example, an optical member such as a polarizing plate). At this time, the surface protective film is removed by separating the end of the surface protective film from the adherend by applying the adhesive tape to the back surface (surface of the back layer) of the surface protective film and pulling the adhesive tape. The workability at the time can be improved and the burden on the adherend can be reduced.
- the surface protective film using the transparent film as a support is suitable for a peeling operation using the pressure-sensitive adhesive tape because the back layer has an appropriate peeling force.
- the structure of the back layer is preferably a single layer structure from the viewpoint of strength and productivity. Moreover, it is preferable that the said back surface layer is provided directly on the 1st surface of the said base material layer.
- the adhesion between the intermediate layer, the base material layer and the back surface layer is insufficient, and the fracture start load of the back layer is reduced. It tends to decrease (scratch resistance decreases). Therefore, in order to realize the fracture initiation load disclosed herein, it is advantageous to adopt a configuration in which the back layer is directly provided on the base material layer.
- the back layer is made of a resin material containing a lubricant.
- lubricant refers to a component having an action of reducing the coefficient of friction when blended with a resin material.
- the back layer made of a resin material containing a lubricant is preferable because the preferable friction coefficient disclosed herein is easily realized, and thus a transparent film excellent in scratch resistance is easily realized.
- the back layer is made of a resin material containing an antistatic component.
- scratch resistance and antistatic properties can be imparted using the back layer. Therefore, the productivity of the transparent film is better than the configuration in which the antistatic layer is provided separately from the back layer.
- the adhesion between the back surface layer and the base material layer can be improved as compared with the configuration in which the antistatic layer is interposed between the back surface layer and the base material layer, the above fracture start load is satisfied and the scratch resistance is excellent.
- Transparent film is easy to realize.
- the antistatic component a conductive polymer can be preferably employed because it is easy to achieve both good antistatic properties and high scratch resistance.
- a surface protective film provided with any transparent film disclosed herein as a support.
- the surface protective film typically includes the transparent film and an adhesive layer provided on the surface of the transparent film opposite to the back layer.
- Such a surface protective film is particularly suitable as a surface protective film for optical parts.
- FIG. 1 is a schematic cross-sectional view showing one structural example of the surface protective film according to the present invention.
- FIG. 2 is a schematic cross-sectional view showing another configuration example of the surface protective film according to the present invention.
- FIG. 3 is an optical microscope image showing an example of scratch marks.
- FIG. 4 is a schematic explanatory view showing a method for measuring the fracture start load.
- the transparent film disclosed herein is excellent in scratch resistance, and thus can be preferably used for a support of an adhesive sheet and other uses.
- a pressure-sensitive adhesive sheet may generally have a form called a pressure-sensitive adhesive tape, a pressure-sensitive adhesive label, a pressure-sensitive adhesive film, or the like.
- it is suitable as a support for a surface protective film, and since it can accurately inspect the appearance of products through the film, it is particularly used as an optical component (for example, a liquid crystal display panel component such as a polarizing plate or a wave plate).
- an optical component for example, a liquid crystal display panel component such as a polarizing plate or a wave plate.
- the surface protective film disclosed herein is characterized by having an adhesive layer on one side of the transparent film.
- the pressure-sensitive adhesive layer is typically formed continuously, but is not limited to such a form.
- the pressure-sensitive adhesive layer is a pressure-sensitive adhesive layer formed in a regular or random pattern such as a spot or stripe. There may be.
- the surface protective film disclosed herein may be in the form of a roll or a single sheet.
- FIG. 1 schematically shows a typical configuration example of a surface protective film having a transparent film disclosed herein as a support.
- the surface protective film 1 includes a transparent film (support) 10 and an adhesive layer 20.
- the transparent film 10 includes a base material layer 12 made of a transparent resin film and a back layer 14 having a thickness of 1 ⁇ m or less provided directly on the first surface 12A.
- the pressure-sensitive adhesive layer 20 is provided on the surface of the transparent film 10 opposite to the back layer 14.
- the surface protective film 1 is used by sticking the pressure-sensitive adhesive layer 20 to an adherend (a surface to be protected, for example, the surface of an optical component such as a polarizing plate). As shown in FIG.
- the protective film 1 before use typically has at least the pressure-sensitive adhesive on the surface of the pressure-sensitive adhesive layer 20 (sticking surface to the adherend). It may be in a form protected by a release liner 30 having a release surface on the layer 20 side. Or the form by which the adhesive layer 20 contact
- the base layer of the transparent film disclosed herein can be a resin film (base film) formed by molding various resin materials into a transparent film.
- resin material those capable of constituting a base film excellent in one or more properties among transparency, mechanical strength, thermal stability, moisture shielding property, isotropy, and the like are preferable.
- polyester polymers such as polyethylene terephthalate (PET), polyethylene naphthalate, polybutylene terephthalate; cellulose polymers such as diacetyl cellulose and triacetyl cellulose; polycarbonate polymers; acrylic polymers such as polymethyl methacrylate; etc.
- a resin film composed of a resin material having a base resin can be preferably used as the base material layer.
- the resin material include styrene polymers such as polystyrene and acrylonitrile-styrene copolymers; olefin polymers such as polyethylene, polypropylene, polyolefins having a cyclic or norbornene structure, and ethylene-propylene copolymers; Examples thereof include vinyl chloride polymers; amide polymers such as nylon 6, nylon 6, 6, and aromatic polyamide;
- base resins include imide polymers, sulfone polymers, polyether sulfone polymers, polyether ether ketone polymers, polyphenylene sulfide polymers, vinyl alcohol polymers, vinylidene chloride polymers, vinyl butyral polymers, arylates.
- the base material layer may be composed of a blend of two or more of the above-described polymers.
- the said base material layer is so preferable that there is little anisotropy of optical characteristics (phase difference etc.).
- the base material layer may have a single layer structure or a structure in which a plurality of layers having different compositions are laminated. Typically a single layer structure.
- the thickness of the base material layer can be appropriately selected according to the purpose, but it is usually appropriate to be about 10 ⁇ m to 200 ⁇ m from the viewpoint of workability such as strength and handleability and cost and appearance inspection.
- the thickness is preferably about 15 ⁇ m to 100 ⁇ m, more preferably 20 ⁇ m to 70 ⁇ m.
- the refractive index of the base material layer is usually suitably about 1.43 to 1.6, and preferably about 1.45 to 1.5.
- the substrate layer preferably has a light transmittance of 70% to 99%, and the transmittance is 80% to 97% (for example, 85% to 95%). Is more preferable.
- additives such as antioxidants, ultraviolet absorbers, antistatic components, plasticizers, colorants (pigments, dyes, etc.) are blended in the resin material constituting the base material layer as necessary. Also good.
- corona discharge treatment, plasma treatment, ultraviolet irradiation treatment, acid treatment, alkali treatment, and application of a primer are applied to the first surface of the base material layer (the surface on the side where the back layer is provided).
- Surface treatment may be performed.
- Such a surface treatment can be, for example, a treatment for improving the adhesion between the base material layer and the back surface layer.
- a surface treatment in which a polar group such as a hydroxyl group (—OH group) is introduced on the surface of the substrate layer can be preferably employed.
- the transparent film constituting the surface protective film is the same surface treatment as described above on the second surface of the base material layer (the surface on the side where the pressure-sensitive adhesive layer is formed). May be given.
- a surface treatment may be a treatment for improving the adhesion between the transparent film (support) and the pressure-sensitive adhesive layer (the anchoring property of the pressure-sensitive adhesive layer).
- the transparent film disclosed herein has a back layer having a thickness of 1 ⁇ m or less (typically 0.02 ⁇ m to 1 ⁇ m) on one surface (first surface) of the base material layer.
- the transparent film has a fracture start load of the back layer measured by a scratch test described later of 50 mN or more.
- a transparent film satisfying such a fracture initiation load is excellent in scratch resistance.
- the back layer is not visually removed. Therefore, it is suitable as a support for a surface protective film (particularly, a surface protective film used in the production and transportation of polarizing plates and other optical components).
- the upper limit of the fracture start load is not particularly limited, but usually the fracture start load is set to 300 mN or less (for example, 150 mN or less) in consideration of balance with other characteristics (printability, back surface peeling force, light transmittance, etc.). Is appropriate.
- the fracture initiation load is 50 mN to 300 mN (for example, 50 mN to 150 mN). For example, in the measurement environment of 23 ° C.
- the fracture start load is increased from 0 to 300 mN using a conical diamond indenter having a tip curvature radius of 10 ⁇ m, and the back surface of the transparent film (that is, the back layer) Is obtained as a load corresponding to a location where the length of the fracture start point on the scratch mark is greater than 2 ⁇ m (more specific measurement method will be described later). See experimental example).
- An example of scratch marks obtained under the above conditions is shown in FIG.
- the friction coefficient of the back layer constituting the transparent film is 0.4 or less.
- a load a load that causes scratching
- the load can be received along the surface of the back surface layer, and the frictional force due to the load can be reduced. Accordingly, it is possible to prevent an event in which the back layer is agglomerated and broken due to the frictional force, or the back layer is peeled off from the base material layer (interface breakage) to cause scratches.
- the lower limit of the friction coefficient is not particularly limited. However, considering the balance with other characteristics (printability, back surface peeling force, light transmittance, etc.), the friction coefficient is usually 0.1 or more (typically 0. 0).
- the friction coefficient for example, a value obtained by rubbing the back surface of the transparent film (that is, the surface of the back layer) with a vertical load of 40 mN in a measurement environment of 23 ° C. and 50% RH can be adopted (more For specific measurement methods, see the experimental examples described later).
- a method of reducing (adjusting) the friction coefficient so that the above friction coefficient is realized a method of including various lubricants (leveling agents, etc.) in the back layer, addition of a cross-linking agent and adjustment of film forming conditions can be used. A method of increasing the cross-linking density can be appropriately employed.
- the structural characteristics that the thickness of the back layer constituting the transparent film is 1 ⁇ m or less, and this is particularly effective in a transparent film having such a thin back layer.
- Adopt a scratch improvement technique. That is, when the back layer has a certain thickness (for example, 5 ⁇ m or more), the fracture start load is improved by increasing the hardness of the back layer (in other words, a layer having a strength that can withstand the load). Forming) and improving scratch resistance.
- the present inventor has found that in the case of a transparent film having a back layer thickness of 1 ⁇ m or less, improvement in scratch resistance cannot be achieved accurately if the above technical idea is applied as it is. This is considered to be because, in a transparent film having a thin back layer structure, the load applied to the back layer easily reaches the base layer and deforms the base layer.
- the present inventor found that when only the hardness of the thin back layer was increased without changing the base material layer in such a structure, It has been found that the deformation of the back surface layer cannot follow the deformation of the base material layer, and therefore, an adhesion failure occurs between the base material layer and the back surface layer, and the fracture start load is reduced.
- the plastic index ratio (Ps / Pb) defined as the ratio between the plastic index Ps of the back layer and the plastic index Pb of the base material layer is set to 1. It has been found that it is effective to set it to 5 or more.
- the plastic indexes Ps and Pb are, for example, near a depth of 10 nm by vertically pushing a barco pitch (triangular pyramid) diamond indenter having a radius of curvature of 0.1 ⁇ m in a measurement environment of 23 ° C. and 50% RH. It can be calculated by measuring the indentation elastic modulus and hardness and dividing the measured value of the elastic modulus by the measured value of hardness (for more specific measurement examples, see the experimental examples described later). It can be said that the higher the plasticity index, the easier it is to deform with respect to the load. That is, that Ps / Pb is 1.5 or more means that the back layer has a deformability that can sufficiently follow the deformation of the base material layer.
- Ps / Pb By setting Ps / Pb to 2 or more, better scratch resistance can be realized.
- the upper limit of Ps / Pb is not particularly limited, but it is usually appropriate to set it to 50 or less in consideration of the balance with other characteristics (friction coefficient, etc.).
- Ps / Pb is 1.5 or more and 3 or less.
- Ps / Pb may be 1.5 or more and 50 or less (for example, 10 or more and 50 or less, more preferably 20 or more and 50 or less).
- These preferable values of Ps / Pb can be preferably applied to, for example, a transparent film in which the base material layer is made of a polyester resin material (typically, a PET resin material).
- the plastic index of a general PET film is about 10 to 20 in general.
- the transparent film configured to satisfy both the preferable plastic index ratio (Ps / Pb) and the friction coefficient disclosed herein, the above-described preferable fracture start load can be easily achieved.
- a transparent film can efficiently reduce the frictional force by having the friction coefficient with respect to the frictional force received on the back surface thereof, and the base material by the frictional force by having the plastic index ratio. Combined with the fact that the back layer can sufficiently follow the deformation of the layer, it can exhibit particularly high scratch resistance. Therefore, such a transparent film is suitable as a support for the surface protective film.
- the back layer has a peel force (back peel force) of 2 N / 19 mm or more measured by peeling off under the conditions of a peel speed of 0.3 m / min and a peel angle of 180 degrees by sticking an adhesive tape to the back layer. It is preferably 3N / 19 mm or more.
- peeling force is particularly meaningful to have the above-described peeling force. If the peeling force is too low, the workability at the time of removing the surface protective film from the adherend by attaching an adhesive tape to the release layer may tend to be reduced.
- the upper limit of the peeling force is not particularly limited, but in consideration of the balance with other characteristics (coefficient of friction, etc.), and when the roll is rewound after being rolled up, the adhesive adheres to the back surface (glue residue) In order to prevent this, it is usually preferably 10 N / 19 mm or less, for example, 6 N / 19 mm or less.
- the back surface peeling force is 2 to 10 N / 19 mm (more preferably 3 to 6 N / 19 mm).
- the said peeling force is obtained by measuring in the environment of 23 degreeC and 50% RH using the single-sided adhesive tape by the Nitto Denko Corporation, brand name "No. 31B", for example (more specific measurement). For the method, refer to the experimental examples described later).
- the printability in the technology disclosed herein refers to a property that can be easily printed with oil-based ink (for example, using an oil-based marking pen).
- oil-based ink for example, using an oil-based marking pen.
- an adherend for example, an optical component
- a surface protective film provided with the transparent film.
- the solvent is alcohol-based and has high printability for oil-based inks containing pigments.
- the printed ink is difficult to be removed by rubbing or transfer (that is, excellent in print adhesion). The degree of the printability can be grasped by, for example, printability evaluation described later.
- the material of the resin constituting the back layer can be appropriately selected so as to realize a preferable fracture start load and friction coefficient (more preferably, a plastic index ratio) disclosed herein. It is preferable to select a resin that is excellent in scratch resistance, can form a layer having sufficient strength, and has excellent light transmittance.
- a resin that is excellent in scratch resistance, can form a layer having sufficient strength, and has excellent light transmittance.
- Such resin may be various types of resins such as thermosetting resin, ultraviolet curable resin, electron beam curable resin, and two-component mixed resin.
- thermosetting resins include polysiloxanes, polysilazanes, polyurethanes, acrylic-urethanes, acrylic-styrenes, fluororesins, acrylic silicones, acrylics, polyesters, polyolefins, etc. Are listed. Of these, thermosetting resins such as polyurethane, acryl-urethane, and acryl-styrene are preferred because they have high elasticity and can easily form a layer having a preferable plastic index ratio disclosed herein. . In addition, a thermosetting resin such as polysiloxane or polysilazane is preferable in that a high-hardness layer can be easily formed.
- the fluororesin-based thermosetting resin is preferable in that it contains a slip component in the molecular structure and can easily form a layer having a preferable coefficient of friction disclosed herein.
- a resin having a soft segment and a hard segment is preferred.
- the soft segment refers to a resin component having a flexible main chain structure or characteristics
- the hard segment refers to a resin component having a rigid main chain structure or characteristics (at least stiffer than the soft segment).
- Any of the thermosetting resins used for forming the back layer in samples A-4 to A-10 described later corresponds to a resin having a soft segment and a hard segment.
- distributed to the aqueous solvent can be used preferably.
- the viscosity and concentration can be easily adjusted by dispersing it in an aqueous medium as emulsion particles.
- a resin component is suitable for forming a coating film excellent in plastic deformability. Therefore, according to the resin in emulsion form (for example, thermosetting resin), the above-described back layer exhibiting the preferable plastic index ratio (high plastic index ratio) can be suitably realized.
- the ultraviolet curable resin include monomers, oligomers, polymers, and mixtures of various resins such as polyester, acrylic, urethane, amide, silicone, and epoxy.
- An ultraviolet curable resin containing / or an oligomer thereof can be preferably used.
- acrylic monomers such as polyfunctional acrylates and polyfunctional methacrylates can be preferably used. From the viewpoint of adhesion to the base material layer, it is advantageous to use a thermosetting resin rather than an ultraviolet curable resin.
- the thickness of the back layer can be, for example, about 0.02 ⁇ m to 1 ⁇ m, and preferably about 0.05 ⁇ m to 0.5 ⁇ m (for example, 0.05 ⁇ m to 0.2 ⁇ m).
- the thickness of the layer constituting the transparent film or the surface film (for example, the back layer) disclosed herein is determined by subjecting the back layer to heavy metal dyeing in advance and then cutting the transparent film in the cross-sectional direction. The obtained sample can be grasped by a high-resolution observation technique using a transmission electron microscope (TEM) or the like.
- TEM transmission electron microscope
- This technique can be preferably applied to a layer having a thickness of about 0.01 ⁇ m or more.
- various thickness detectors for example, surface roughness meters, interference thickness meters, infrared spectrometers, various X-ray diffractometers, etc.
- thicknesses obtained by electron microscope observation
- the approximate thickness can be calculated.
- the layer configuration in the cross-sectional direction (the number of layers and the thickness of each layer in the stacked structure) may be observed. Further, when each layer has a thickness of about 0.1 ⁇ m or more, the layer configuration can be examined by an interference thickness meter.
- the back layer in the technology disclosed herein includes, if necessary, a lubricant (leveling agent, etc.), an antistatic component, a crosslinking agent, an antioxidant, a colorant (pigment, dye, etc.), a fluidity modifier (thixotropy). Agents, thickeners, etc.), film-forming aids, catalysts (for example, an ultraviolet polymerization initiator in a composition containing an ultraviolet curable resin), and the like can be added.
- a lubricant leveling agent, etc.
- an isocyanate-based cross-linking agent can be preferably employed because it can be bonded to a hydroxyl group that may be present on the surface of the base material layer to improve adhesion.
- a back surface layer is formed on a base material layer that has been subjected to a surface treatment (for example, corona treatment) in which a hydroxyl group is introduced, the use of an isocyanate-based crosslinking agent is effective.
- the back layer can be suitably formed by a technique including applying to the base layer a liquid composition in which the resin component and additives used as necessary are dispersed or dissolved in a suitable solvent.
- a method of applying the liquid composition (the composition for forming the back layer) to the base material layer and drying it, and performing a curing treatment (heat treatment, ultraviolet treatment, etc.) as necessary can be preferably employed.
- the solid content of the composition can be, for example, about 0.1 to 10% by mass, and is usually about 0.5 to 5%. If the solid content is too high, it may be difficult to form a thin and uniform back layer.
- the solvent constituting the back layer forming composition may be an organic solvent, water, or a mixed solvent thereof.
- the organic solvent include one or two selected from methyl ethyl ketone, acetone, ethyl acetate, tetrahydrofuran (THF), dioxane, cyclohexanone, n-hexane, toluene, xylene, methanol, ethanol, n-propanol, isopropanol, and the like.
- THF tetrahydrofuran
- dioxane dioxane
- cyclohexanone cyclohexanone
- n-hexane toluene
- xylene methanol
- ethanol ethanol
- n-propanol isopropanol
- the solvent constituting the back layer forming composition is preferably an aqueous solvent from the viewpoint of reducing environmental burden.
- aqueous solvent refers to water or a mixed solvent containing water as a main component (a component occupying 50% by volume or more).
- a hydrophilic solvent is preferably used as components other than water constituting such an aqueous mixed solvent.
- alcohols such as propanol, 2-methyl 1-butanol, n-hexanol, and cyclohexanol can be preferably used.
- a general fluorine-based or silicone-based lubricant can be preferably used as the lubricant.
- silicone-based lubricants are particularly preferred.
- Specific examples of the silicone lubricant include polydimethylsiloxane, polyether-modified polydimethylsiloxane, polymethylalkylsiloxane, and the like.
- a lubricant containing a fluorine compound or a silicone compound having an aryl group or an aralkyl group (sometimes called a printable lubricant because it can give a resin film with good printability) may be used.
- the amount of the lubricant added can be about 25 parts by mass or less (typically 0.01 to 25 parts by mass) per 100 parts by mass of the resin component constituting the back layer, and usually about 15 parts by mass or less (typically In particular, it is preferably 0.02 to 15 parts by mass, for example, about 0.5 to 15 parts by mass, and more preferably about 1 to 10 parts by mass. If the amount of the lubricant added is too large, the printability tends to be insufficient, or the light transmittance of the back layer tends to be lowered.
- the scratch resistance can be improved through the reduction of the friction coefficient by appropriate use of the lubricant.
- the lubricant can make the surface tension of the back layer uniform and contribute to the reduction of thickness unevenness and interference fringes. This is particularly significant in the surface protective film for optical members.
- the resin component constituting the back layer is an ultraviolet curable resin
- a fluorine-based or silicone-based lubricant is added thereto, the lubricant is applied when the back layer forming composition is applied to a substrate and dried. Bleeds to the surface of the coating film (interface with the air), whereby the inhibition of curing by oxygen during ultraviolet irradiation is suppressed, and the ultraviolet curable resin can be sufficiently cured even on the outermost surface of the back layer.
- the above-mentioned antistatic component is a component having an action of preventing charging of a transparent film or a surface protective film using the film.
- an antistatic component for example, an organic or inorganic conductive substance, various antistatic agents, and the like can be used. Of these, the use of an organic conductive material is preferable.
- a transparent film having a back layer provided with an antistatic property by containing such an antistatic component is a surface protective film used in the processing or transporting process of articles that dislike static electricity such as liquid crystal cells and semiconductor devices. It is suitable as.
- organic conductive substance various conductive polymers can be preferably used.
- conductive polymers include polyaniline, polypyrrole, polythiophene, polyethyleneimine, and allylamine polymers.
- Such a conductive polymer may be used individually by 1 type, and may be used in combination of 2 or more type.
- you may use in combination with another antistatic component an inorganic electroconductive substance, an antistatic agent, etc.
- the amount of the organic conductive substance (typically conductive polymer) used can be, for example, about 0.2 to 20 parts by mass with respect to 100 parts by mass of the resin component constituting the back layer. It is appropriate that the amount is about 10 parts by mass.
- a conductive polymer those in the form of an aqueous solution or an aqueous dispersion can be preferably used.
- a conductive polymer having a hydrophilic functional group which can be synthesized by a technique such as copolymerizing a monomer having a hydrophilic functional group in the molecule
- Aqueous solutions or dispersions can be prepared.
- hydrophilic functional group examples include a sulfo group, amino group, amide group, imino group, hydroxyl group, mercapto group, hydrazino group, carboxyl group, quaternary ammonium group, sulfate group (—O—SO 3 H), phosphorus An acid ester group (for example, —O—PO (OH) 2 ) and the like are exemplified.
- Such hydrophilic functional groups may form a salt.
- aqua-PASS manufactured by Mitsubishi Rayon Co., Ltd.
- examples of commercially available products of polythiophene in the form of an aqueous solution or an aqueous dispersion include “Denatron” series manufactured by Nagase Chemtech.
- Examples of the conductive polymer that can be preferably used in the technology disclosed herein include polyaniline and polythiophene.
- the polyaniline preferably has a polystyrene-equivalent weight average molecular weight (hereinafter referred to as “Mw”) of 50 ⁇ 10 4 or less, more preferably 30 ⁇ 10 4 or less.
- Mw polystyrene-equivalent weight average molecular weight
- the Mw of these conductive polymers is usually preferably 0.1 ⁇ 10 4 or more, more preferably 0.5 ⁇ 10 4 or more.
- Such a conductive polymer having Mw is also preferable because it can be easily prepared in the form of an aqueous solution or an aqueous dispersion.
- the inorganic conductive material examples include tin oxide, antimony oxide, indium oxide, cadmium oxide, titanium oxide, zinc oxide, indium, tin, antimony, gold, silver, copper, aluminum, nickel, chromium, titanium, iron, Fine particles composed of cobalt, copper iodide, and alloys or mixtures thereof can be used. Fine particles such as ITO (indium oxide / tin oxide) and ATO (antimony oxide / tin oxide) may be used. The average particle diameter of the fine particles is usually preferably about 0.1 ⁇ m or less (typically 0.01 ⁇ m to 0.1 ⁇ m). Such inorganic conductive materials (inorganic conductive materials) may be used alone or in combination of two or more.
- the amount of the inorganic conductive material used can be, for example, about 5 to 500 parts by mass with respect to 100 parts by mass of the resin component constituting the back layer, and usually 10 to 500 parts by mass (for example, 100 to 500 parts by mass). It is appropriate to set the degree.
- the antistatic agent examples include a cationic antistatic agent, an anionic antistatic agent, an amphoteric ion antistatic agent, a nonionic antistatic agent, and the above cationic, anionic and zwitterionic ion conductive groups.
- examples thereof include an ion conductive polymer obtained by polymerizing or copolymerizing a monomer having the same.
- Such an antistatic agent may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, you may use in combination with another antistatic component.
- the amount of the antistatic agent used can be, for example, about 0.5 to 50 parts by mass, and usually 1 to 30 parts by mass with respect to 100 parts by mass of the resin component constituting the back layer. .
- the cationic antistatic agent examples include those having a cationic functional group such as a quaternary ammonium salt, a pyridinium salt, a primary, secondary, or tertiary amino group. More specifically: an acrylic copolymer having a quaternary ammonium group such as alkyltrimethylammonium salt, acyloylamidopropyltrimethylammonium methosulfate, alkylbenzylmethylammonium salt, acylcholine chloride, polydimethylaminoethyl methacrylate; polyvinyl Examples thereof include styrene copolymers having a quaternary ammonium group such as benzyltrimethylammonium chloride; diallylamine copolymers having a quaternary ammonium group such as polydiallyldimethylammonium chloride;
- anionic antistatic agent examples include those having an anionic functional group such as sulfonate, sulfate ester salt, phosphonate salt, and phosphate ester salt. More specifically, alkyl sulfonate, alkyl benzene sulfonate, alkyl sulfate ester salt, alkyl ethoxy sulfate ester salt, alkyl phosphate ester salt, sulfonic acid group-containing styrene copolymer and the like are exemplified.
- zwitterionic antistatic agents examples include alkylbetaines and their derivatives, imidazolines and their derivatives, alanine and their derivatives. More specifically, alkyl betaines, alkyl imidazolium betaines, carbobetaine graft copolymers, and the like are exemplified.
- nonionic antistatic agents include amino alcohol and derivatives thereof, glycerin and derivatives thereof, polyethylene glycol and derivatives thereof. More specifically, fatty acid alkylolamide, di (2-hydroxyethyl) alkylamine, polyoxyethylene alkylamine, fatty acid glycerin ester, polyoxyethylene glycol fatty acid ester, sorbitan fatty acid ester, polyoxysorbitan fatty acid ester, polyoxy Examples thereof include ethylene alkyl phenyl ether, polyoxyethylene alkyl ether, polyethylene glycol, polyoxyethylene diamine, a copolymer comprising polyether, polyester and polyamide, and methoxy polyethylene glycol (meth) acrylate.
- the base layer contains an antistatic component.
- a method, a method of providing an antistatic layer on the first surface and / or the second surface of the base material layer, and the like can be employed.
- the method of incorporating an antistatic component into the base material layer can be preferably performed by, for example, forming a base material layer by molding a resin material containing an antistatic component (kneaded) into a film shape.
- the antistatic component used in such a method the same materials as those exemplified above as the antistatic component contained in the back layer can be employed.
- the blending amount of the antistatic component can be, for example, about 20% by mass or less (typically 0.05 to 20% by mass) with respect to the total mass of the base material layer. It is suitable to be in the range of ⁇ 10% by mass.
- the method for kneading the antistatic component is not particularly limited as long as the antistatic agent can be uniformly mixed with the resin material for forming the base layer. For example, a heating roll, a Banbury mixer, a pressure kneader, two A method of kneading using a shaft kneader or the like can be mentioned.
- the method of providing an antistatic layer on the first side (back side, that is, between the base layer and the back layer) and / or the second side (adhesive layer side) of the base layer is the antistatic component and, if necessary, It can be preferably carried out by applying an antistatic coating agent containing a resin component used in the step to a base material layer (preferably a pre-formed resin film).
- a base material layer preferably a pre-formed resin film.
- the antistatic component the same materials as those exemplified above as the antistatic component contained in the back layer can be employed.
- the use of conductive polymers or antistatic agents is preferred.
- the resin component used for the antistatic coating agent for example, a general-purpose resin such as a polyester resin, an acrylic resin, a polyvinyl resin, a urethane resin, a melamine resin, and an epoxy resin can be used.
- the antistatic coating agent contains a methylol- or alkylol-containing melamine-based, urea-based, glyoxal-based, acrylamide-based compound, epoxy compound, isocyanate-based compound, etc. as a crosslinking agent for the resin component. May be.
- a polymer type antistatic component typically a conductive polymer
- the use of a resin component may be omitted.
- a known coating method can be appropriately used. Specific examples include a roll coating method, a gravure coating method, a reverse coating method, a roll brush method, a spray coating method, an air knife coating method, an impregnation method, and a curtain coating method.
- the thickness of the antistatic layer is usually suitably about 0.01 ⁇ m to 1 ⁇ m, and preferably about 0.015 ⁇ m to 0.1 ⁇ m.
- the back layer is provided directly on the first surface of the base material layer.
- the transparent film having such a configuration is preferable because it has excellent adhesion between the base material layer and the back layer, and thus easily satisfies the above-described preferable fracture start load. Therefore, when the antistatic layer is provided on the surface of the base material layer, the antistatic layer is preferably provided only on the second surface of the base material layer.
- a pressure-sensitive adhesive composition capable of forming a pressure-sensitive adhesive layer having properties suitable for the surface protective film (peeling power to the adherend surface, non-contamination, etc.) It can form suitably using a thing.
- a method of forming the pressure-sensitive adhesive layer by directly applying the pressure-sensitive adhesive composition to the base material layer and drying or curing (direct method); and applying the pressure-sensitive adhesive composition to the surface (release surface) of the release liner Adhesive layer is formed on the surface by drying and curing, and this adhesive layer is bonded to the base material layer and transferred to the base material layer (transfer method); etc. can do.
- the above direct method can be preferably employed.
- a pressure-sensitive adhesive such as a roll coating method, a gravure coating method, a reverse coating method, a roll brush method, a spray coating method, an air knife coating method, a coating method using a die coater, etc.
- the thickness of the pressure-sensitive adhesive layer can be, for example, about 3 ⁇ m to 100 ⁇ m, and usually about 5 ⁇ m to 50 ⁇ m is preferable.
- a method of forming the pressure-sensitive adhesive layer on a base material layer that is, a transparent film
- a pressure-sensitive adhesive layer on the base material layer Any of the methods of forming the back layer after providing the film can be employed.
- a method of providing an adhesive layer on a transparent film is preferred.
- the surface protective film disclosed herein has a release liner bonded to the pressure-sensitive adhesive surface for the purpose of protecting the pressure-sensitive adhesive surface (the surface of the pressure-sensitive adhesive layer that is attached to the adherend), if necessary. It can be provided in the form (in the form of a surface protective film with a release liner).
- a base material constituting the release liner paper, a synthetic resin film or the like can be used, and a synthetic resin film is suitably used from the viewpoint of excellent surface smoothness.
- a resin film made of the same resin material as the base material layer can be preferably used as the base material of the release liner.
- the thickness of the release liner can be, for example, about 5 ⁇ m to 200 ⁇ m, and usually about 10 ⁇ m to 100 ⁇ m is preferable.
- the surface of the release liner to be bonded to the pressure-sensitive adhesive layer is released using a conventionally known release agent (eg, silicone, fluorine, long chain alkyl, fatty acid amide, etc.) or silica powder. Or antifouling processing may be given.
- Fracture starting load A nano scratch tester manufactured by CSM Instruments SA was used as a measuring device for the fracture starting load.
- the adhesive surface of each surface protective film sample was affixed to a slide glass, and the back layer was faced up and fixed to the stage of the measuring apparatus.
- a cantilever ST-150 equipped with a conical diamond indenter (tip radius of curvature 10 ⁇ m) in a measurement environment of 23 ° C. and 50% RH a load of 0 to 300 mN was applied in the continuous load mode of the above apparatus.
- a scratch test was carried out by rubbing in one direction while increasing (scratch load).
- the scratch marks were observed on the surface of the sample subjected to the scratch test with an objective lens 20 times. Then, as shown in FIG. 4, the first location where the back layer is peeled longer than 2 ⁇ m in the scratch direction on the scratch mark is taken as the fracture start point, and the length of the fracture start point with respect to the scratch direction (destruction length) The scratch load corresponding to the center was taken as the fracture start load.
- Plasticity index ratio For each sample (a back layer is provided on a substrate), the above 3.
- Substrate adhesion Each sample was prepared by mixing a small amount of blue pigment into the composition for forming the back layer. Under a measurement environment of 23 ° C. and 50% RH, the back layer forming side surface of each sample was cut into 10 squares ⁇ 10 squares (total of 100 squares) at intervals of 1 mm in length and breadth, and single-sided adhesive was applied from above. A tape (No. 31B manufactured by Nitto Denko Corporation, width 19 mm) was pressure-bonded under the same conditions as in the above-mentioned peeling force measurement, and then a cross-cut peel test was performed to peel the single-sided adhesive tape by hand. In the cross cut test, 1 point was given when the dropout was 50 squares or more, 2 points were given when the dropout was 11 squares or more and 49 squares or less, and 3 points were given when the dropout was 10 squares or less.
- Printability (print adhesion) evaluation Under a measurement environment of 23 ° C. and 50% RH, printing was performed on the back layer using an X stamper manufactured by Shachihata. A cellophane adhesive tape (product number No. 405, width 19 mm) manufactured by Nichiban Co., Ltd. was applied from the top of the print, and then peeled off under the conditions of a peeling speed of 30 m / min and a peeling angle of 180 degrees.
- x indicates that 50% or more of the printed area is peeled
- ⁇ indicates that 25% of the printed area is peeled off and less than 50% is peeled
- 75% or more of the printed area remains without being peeled. The case was rated as ⁇ .
- Whitening and unevenness evaluation The haze value of each sample was measured with a haze meter (manufactured by Murakami Color Research Laboratory, model “HM-150”). Evaluation of unevenness: The appearance of the sample was visually evaluated in a bright room, and a case where no appearance abnormality such as a streak was observed was regarded as acceptable. Samples that passed both the whitening and unevenness evaluations were rated as whitening / unevenness as ⁇ , ⁇ when either evaluation was unacceptable, and X evaluation when both were unacceptable.
- Example A-1 Urethane acrylate-based ultraviolet curable resin (manufactured by Nippon Synthetic Chemical Co., Ltd., trade name “purple UV-1700B”; hereinafter sometimes referred to as “resin R1”) and radical polymerization initiator (trade name, manufactured by Ciba Geigy Co., Ltd.) "Darocur 1173”) was mixed so that the mass ratio of the solid content was 100: 4, and dissolved in a solvent containing toluene as a main component to prepare a coating liquid B-1 having a solid content concentration of 30%. .
- a transparent polyethylene terephthalate (PET) film (hereinafter also referred to as “base material F1”) having a thickness of 38 ⁇ m and subjected to corona treatment on one side was used.
- the coating liquid B-1 is applied to one surface (corona-treated surface) of the substrate F1 so that the thickness after drying is 8 ⁇ m (according to TEM observation; the same applies hereinafter), and a curing treatment is performed by irradiating with ultraviolet rays.
- a back layer was formed. The irradiation of the ultraviolet rays was performed under the condition of 450 mJ / cm 2 using a metal halide lamp. In this way, a transparent film C-1 having a back layer provided on one side (corona-treated side) of the substrate F1 was obtained.
- a release sheet having a release treatment with a silicone release treatment agent is prepared on one side of a PET film, and an acrylic pressure-sensitive adhesive having a thickness of 25 ⁇ m is provided on the release surface (the release treatment surface) of the release sheet.
- a layer was formed.
- the pressure-sensitive adhesive layer was transferred to the other surface of the transparent film C-1 (the surface on which the back layer was not provided) to prepare a surface protective film sample A-1.
- the plastic index Ps of sample A-1 was determined by the above method and found to be 22.6 (elastic modulus 6.6 GPa, hardness 0.29 GPa).
- the plastic index Pb of the PET film used here was 13.6 (elastic modulus 4.8 GPa, hardness 0.35 GPa).
- the PET film had a refractive index of 1.63 and a light transmittance of 89%.
- Example A-2 The coating liquid B-1 was further diluted with the above solvent to prepare a coating liquid B-2 having a solid content concentration of 1%.
- a transparent film C-2 was obtained in the same manner as in the preparation of Sample A-1, except that the coating liquid B-2 was applied so that the thickness after drying was 0.1 ⁇ m, and the adhesive layer was transferred in the same manner.
- the plastic index Ps of this sample A-2 was 14.4 (elastic modulus 4.8 GPa, hardness 0.33 GPa).
- Example A-3 A coating liquid B-3 was prepared in the same manner as the coating liquid B-2, except that 5 parts (in terms of solid content) of a lubricant was blended per 100 parts of the solid content of the resin R1.
- a polyether-modified polydimethylsiloxane leveling agent manufactured by BYK Chemie, trade name “BYK-333”; hereinafter sometimes referred to as “lubricant L1” was used as the lubricant.
- a transparent film C-3 was obtained in the same manner as in the preparation of Sample A-1, except that the coating liquid B-3 was applied so that the thickness after drying was 0.1 ⁇ m, and the adhesive layer was transferred in the same manner.
- the plastic index Ps of this sample A-3 was 13.2 (elastic modulus 4.4 GPa, hardness 0.34 GPa).
- Table 1 shows the schematic configuration of the back layer and Table 2 shows the results of the various measurements and evaluations described above.
- sample A-1 having a back layer thickness of 8 ⁇ m showed good scratch resistance, but sample A ⁇ having the same composition and a back layer thickness of 0.1 ⁇ m was used.
- scratch resistance was insufficient. This is because, in a configuration in which the thickness of the back surface layer is small, the hardness of the back surface layer is too high compared to the base material layer (therefore, the plastic index ratio is too small). It is thought that it becomes easy to break because it cannot follow the deformation. Also, the reason that the friction coefficient of A-2 is higher than that of sample A-1 is presumed to be that a load related to the breakage of the back layer was detected in the measurement of the friction coefficient.
- Example A-4 A water dispersion type polyurethane thermosetting resin (manufactured by Nippon Polyurethane Co., Ltd., trade name “Takelac WS-4100”; hereinafter sometimes referred to as “resin R2”) is diluted with distilled water to obtain a solid content concentration.
- a 20% coating solution B-4 was prepared.
- the back surface layer is provided on one side of the substrate F1 by applying the coating liquid B-4 on one side (corona-treated surface) of the substrate F1 so that the thickness after drying becomes 8 ⁇ m and thermosetting.
- a transparent film C-4 was obtained.
- the pressure-sensitive adhesive layer was transferred to the other surface of the transparent film C-4 in the same manner as described above to prepare a surface protective film sample A-4.
- the plastic index Ps of this sample A-4 was 21.8 (elastic modulus 3.4 GPa, hardness 0.16 GPa).
- Example A-5 The coating liquid B-4 was further diluted with distilled water to prepare a coating liquid B-5 having a solid content concentration of 1%.
- a transparent film C-5 was obtained in the same manner as in the preparation of Sample A-4 except that the coating liquid B-5 was applied so that the thickness after drying was 0.1 ⁇ m, and the adhesive layer was transferred in the same manner. Thus, a surface protective film sample A-5 was produced.
- the plastic index Ps was 17.6 (elastic modulus 4.9 GPa, hardness 0.28 GPa).
- Example A-6 A coating liquid B-6 was prepared in the same manner as the coating liquid B-5 except that 5 parts (solid content conversion) of the lubricant L1 was blended per 100 parts of the solid content of the resin R2.
- a transparent film C-6 was obtained in the same manner as in the preparation of Sample A-4 except that the coating liquid B-6 was applied so that the thickness after drying was 0.1 ⁇ m, and the adhesive layer was transferred in the same manner.
- the plastic index Ps was 29.5 (elastic modulus 2.5 GPa, hardness 0.09 GPa).
- Example A-7 Transparent film C-7 was obtained in the same manner as Sample A-6 except that the amount of lubricant L1 was 10 parts per 100 parts of solid content of resin R2 (in terms of solid content).
- the surface protective film sample A-7 was produced by transfer.
- the plastic index Ps was 37.7 (elastic modulus 2.1 GPa, hardness 0.05 GPa).
- Example A-8 A water-dispersible acrylic-styrene thermosetting resin (manufactured by DIC, trade name “VONCOAT CG-8490”; hereinafter sometimes referred to as “resin R3”) is diluted with distilled water.
- a coating solution B-8 having a solid content concentration of 3% was prepared.
- the coating liquid B-8 is applied to one surface (corona-treated surface) of the base material F1 so that the thickness after drying is 0.1 ⁇ m, and is thermally cured, whereby a back layer is formed on one surface of the base material F1.
- a transparent film C-8 provided with was obtained.
- the pressure-sensitive adhesive layer was transferred to the other surface of the transparent film C-8 in the same manner as described above to prepare a surface protective film sample A-8.
- the plastic index Ps of this sample A-8 was 361.7 (elastic modulus 3.61 GPa, hardness 0.01 GPa).
- Example A-9 Resin R3, lubricant L1, and conductive polymer as an antistatic component (manufactured by Mitsubishi Rayon Co., Ltd., water dispersion of polyanilinesulfonic acid having a weight average molecular weight of about 15 ⁇ 10 4 , trade name “aqua-PASS”; AS1 ”) is mixed so that the mass ratio of the solid content is 100: 2: 6, diluted with distilled water, and coating liquid B-9 having a solid content concentration of 3% is obtained.
- a transparent film C-9 is obtained in the same manner as in the preparation of Sample A-8 except that the coating liquid B-9 is applied so that the thickness after drying becomes 0.1 ⁇ m, and the adhesive layer is transferred in the same manner.
- the plastic index Ps of Sample A-9 was 298 (elastic modulus 2.7 GPa, hardness 0.009 GPa).
- Example A-10 Resin R3, lubricant L1, and conductive filler as an antistatic component (tin oxide sol manufactured by Taki Chemical Co., Ltd., trade name “Cerames S-8”; hereinafter also referred to as “AS2”).
- AS2 trade name “Cerames S-8”; hereinafter also referred to as “AS2”.
- the mixture was mixed so that the mass ratio of the solid content was 100: 2: 300 and diluted with distilled water to prepare a coating liquid B-10 having a solid content concentration of 3%.
- a transparent film C-10 was obtained in the same manner as in the preparation of Sample A-8 except that the coating liquid B-10 was applied so that the thickness after drying was 0.1 ⁇ m, and the adhesive layer was transferred in the same manner.
- the plasticity index Ps was 15.4 (elastic modulus 6.1 GPa, hardness 0.40 GPa).
- Table 3 shows the schematic configuration of the back layer and Table 4 shows the results of the various measurements and evaluations described above.
- Samples A-8 and A-9 the back layer resin composition of which is different from A-6 and A-7, a friction coefficient of 0.4 or less and a plastic index ratio of 2 or more are obtained. High fracture initiation load and excellent scratch resistance were achieved. All of these samples A-6 to 9 had an appropriate peeling force of 3 to 6 N / 19 mm, and exhibited good substrate adhesion and printability. Further, no whitening or unevenness was observed, and the degree of curling was small. Samples A-8 and A-9 having a plastic index ratio in the range of 10 to 50 (more specifically 20 to 50) exhibited particularly good substrate adhesion.
- Sample A-5 in which the lubricant was omitted from Sample A-6, had a high coefficient of friction, a low fracture initiation load, and lacked scratch resistance, probably due to the plastic index ratio being too small.
- scratch resistance was insufficient even in Sample A-4 having a large thickness.
- Sample A-10 which has a different type of antistatic component from sample A-9, has a high coefficient of friction, low fracture initiation load, and lacks scratch resistance, possibly due to the plastic index ratio being too small. Met.
- the transparent film disclosed herein can be preferably used for applications such as a support for various surface protective films.
- the surface protective film disclosed herein is an optical member used in the production or transportation of an optical member used as a component of a liquid crystal display panel, a plasma display panel (PDP), an organic electroluminescence (EL) display, or the like. It is suitable for the use which protects.
- it is useful as a surface protective film applied to optical members such as polarizing plates (polarizing films) for liquid crystal display panels, wave plates, retardation plates, optical compensation films, brightness enhancement films, light diffusion sheets, and reflective sheets. .
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Abstract
Description
また、図面に記載の実施形態は、本発明を明瞭に説明するために模式化されており、製品として実際に提供される本発明の透明フィルムまたは表面保護フィルムのサイズや縮尺を正確に表したものではない。
基材層の屈折率は、通常は1.43~1.6程度とすることが適当であり、1.45~1.5程度とすることが好ましい。また、基材の透明性の観点から、基材層は70%~99%の光線透過率を有することが好ましく、該透過率が80%~97%(例えば85%~95%)であることがより好ましい。
上記破壊開始荷重は、例えば、23℃、50%RHの測定環境下において、先端曲率半径10μmの円錐型ダイヤモンド製圧子を用いて0~300mNまで荷重を増加させつつ透明フィルムの背面(すなわち背面層の表面)を一方向に擦過(スクラッチ)し、そのスクラッチ痕上の破壊開始点の長さが2μmより大きくなった箇所に対応する荷重として求められる(より具体的な測定方法については、後述する実験例参照)。上記条件で得られたスクラッチ痕の一例を図3に示す。
上記摩擦係数としては、例えば、23℃、50%RHの測定環境下において、透明フィルムの背面(すなわち背面層の表面)を垂直荷重40mNで擦過して求められる値を採用することができる(より具体的な測定方法については、後述する実験例参照)。上記摩擦係数が実現されるように摩擦係数を低下させる(調整する)手法としては、背面層に各種滑剤(レベリング剤等)を含有させる方法、架橋剤の添加や成膜条件の調整により背面層の架橋密度を高める方法、等を適宜採用することができる。
上記背面層は、上記樹脂成分および必要に応じて使用される添加剤が適当な溶媒に分散または溶解した液状組成物を上記基材層に付与することを含む手法によって好適に形成され得る。例えば、上記液状組成物(背面層形成用組成物)を基材層に塗布して乾燥させ、必要に応じて硬化処理(熱処理、紫外線処理など)を行う手法を好ましく採用し得る。上記組成物の固形分は、例えば0.1~10質量%程度とすることができ、通常は0.5~5%程度とすることが適当である。固形分が高すぎると、薄く均一な背面層を形成し難くなる場合がある。
破壊開始荷重の測定装置としては、CSM InstrumentsSA社製のナノスクラッチテスターを使用した。各表面保護フィルムサンプルの粘着面をスライドガラスに貼り付け、背面層を上向きにして、上記測定装置のステージに固定した。そして、23℃、50%RHの測定環境下、円錐型のダイヤモンド製圧子(先端の曲率半径 10μm)を備えたカンチレバーST-150を用いて、上記装置の連続荷重モードで、0~300mNまで荷重(スクラッチ荷重)を増加させつつ一方向に擦過するスクラッチ試験を行った。
上記スクラッチ試験を実施したサンプルを、装置付属の光学顕微鏡(ニコン社製)を用いて、対物レンズ20倍でスクラッチ痕を表面観察した。そして、図4に示すように、スクラッチ痕上において背面層がスクラッチ方向に2μmよりも長く剥離した最初の箇所を破壊開始点とし、その破壊開始点のスクラッチ方向に対する長さ(破壊長さ)の中心に対応するスクラッチ荷重を破壊開始荷重とした。
23℃、50%RHの測定環境下、上記ナノスクラッチテスターの定荷重モード(垂直荷重40mN±3mN)にて、上記同様にしてスライドガラスに貼り付けた各サンプルの表面(背面層側)を5mmの長さで擦過し、このときの摩擦係数の平均値を背面層の摩擦係数とした。なお、摩擦係数は、摩擦力と、サンプル表面に垂直な方向への荷重の比として算出される(すなわち、摩擦係数=摩擦力/荷重)。
MTSシステムズ社製のナノインテンダー、型式「DCM SA2」を用いて塑性指数を評価した。すなわち、上記と同様にして各サンプルをスライトガラスに貼り付け、その背面層が上向きとなるようにステージ上に固定した。測定は、23℃、50%RHの測定環境下において、バーコピッチ(三角錐)型のダイヤモンド製圧子(先端の曲率半径 0.1μm)を用いて、最大深さ500nmまで垂直に押し込み、深さ10nm付近の押込み弾性率(Indentation Modulus)および硬度(Hardness)を測定した。そして、上記弾性率の測定値を硬度の測定値で除して塑性指数を算出した(すなわち、塑性指数=弾性率/硬度)。
各サンプル(基材上に背面層が設けられている。)につき、上記3.により求めた塑性指数Psを、当該サンプルを構成する基材(背面層を有しない基材)の塑性指数Pbで除して塑性指数比を算出した(すなわち、塑性指数比=Ps/Pb)。
各表面保護フィルムサンプルを幅70mm、長さ100mmのサイズにカットしたものを被着体とした。片面粘着テープ(日東電工社製No.31B)を幅19mm、長さ100mmのサイズにカットし、該粘着テープの粘着面を上記被着体の背面層上に、0.25MPaの圧力、0.3m/分の速度で圧着した。これを23℃、50%RHの環境下に30分間放置した後、同環境下で万能引張試験機を用いて上記被着体から上記粘着テープを剥離速度0.3m/分、剥離角度180度の条件で剥離し、このときの剥離力を測定した。
上記同様にして各サンプルをスライドガラスに貼り付け、23℃、50%RHの測定環境下において、コイン(新品の10円玉を使用した。)の縁を用いて精密天秤上で各サンプルを荷重300gで擦過した。そのスクラッチ痕を光学顕微鏡にて観察し、背面層の脱落屑の存在が確認された場合を×、該脱落屑の存在が確認されなかった場合を○評価とした。
背面層形成用の組成物に少量の青色顔料を混ぜて各サンプルを作製した。23℃、50%RHの測定環境下において、それらのサンプルの背面層形成側表面に、縦横各1mmの間隔で10マス×10マス(合計100マス)の切りキズをつけ、その上から片面粘着テープ(日東電工社製No.31B、幅19mm)を上記剥離力測定と同条件で圧着した後、該片面粘着テープを手で剥離する碁盤目剥離試験を実施した。その碁盤目試験において、50マス以上の脱落が見られた場合を1点、脱落が11マス以上49マス以下の場合を2点、脱落が10マス以下の場合を3点評価とした。
23℃、50%RHの測定環境下で、シャチハタ社製Xスタンパーを用いて背面層上に印字を施した。その印字の上からニチバン社製のセロハン粘着テープ(品番No.405、幅19mm)を貼り付け、次いで剥離速度30m/分、剥離角度180度の条件で剥離した。目視評価により、印字面積の50%以上が剥離された場合を×、印字面積の25%を超えて50%未満が剥離された場合を△、印字面積の75%以上が剥離されずに残った場合を○評価とした。
白化評価:ヘイズメーター(村上色彩技術研究所製、型式「HM-150」)にて各サンプルのヘイズ値を測定し、ヘイズ値5以下を合格とした。
ムラ評価:明室にてサンプルの外観を目視評価し、スジなどの外観異常が認められない場合を合格とした。
上記白化、ムラの両評価ともに合格であったサンプルは白化・ムラを○とし、いずれか一方の評価が不合格であった場合は△、両方とも不合格であった場合は×評価とした。
各サンプルを100mm四方のサイズにカットし、40℃、90%RHの環境下に1日保管した。これを水平な平面上に背面層が上面になる向きで静置し、上記平面からサンプルの端部がカールして浮いた高さを計測した。最も大きく浮いた部分の高さ(最大浮き高さ)が3mm以下の場合を○、最大浮き高さが3mmを超える場合を×評価とした。
(サンプルA-1)
ウレタンアクリレート系紫外線硬化型樹脂(日本合成化学社製、商品名「紫光UV-1700B」;以下、「樹脂R1」と表記することもある。)と、ラジカル重合開始剤(チバガイギー社製、商品名「ダロキュア1173」)とを、固形分の質量比が100:4となるように混合し、トルエンを主成分とする溶媒に溶解して、固形分濃度30%のコート液B-1を調製した。
コート液B-1を上記溶媒でさらに希釈して、固形分濃度1%のコート液B-2を調製した。このコート液B-2を乾燥後の厚みが0.1μmとなるように塗布した点以外はサンプルA-1の作製と同様にして透明フィルムC-2を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-2を作製した。このサンプルA-2の塑性指数Psは14.4であった(弾性率4.8GPa、硬度0.33GPa)。
樹脂R1の固形分100部当たり5部(固形分換算)の滑剤を配合した点以外はコート液B-2の調製と同様にして、コート液B-3を調製した。ここで、滑剤としては、ポリエーテル変性ポリジメチルシロキサン系レベリング剤(BYK Chemie社製、商品名「BYK-333」;以下、「滑剤L1」と標記することもある。)を使用した。このコート液B-3を乾燥後の厚みが0.1μmとなるように塗布した点以外はサンプルA-1の作製と同様にして透明フィルムC-3を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-3を作製した。このサンプルA-3の塑性指数Psは13.2であった(弾性率4.4GPa、硬度0.34GPa)。
(サンプルA-4)
水分散型のポリウレタン系熱硬化型樹脂(日本ポリウレタン社製、商品名「タケラック WS-4100」;以下、「樹脂R2」と表記することもある。)を蒸留水で希釈して、固形分濃度20%のコート液B-4を調製した。このコート液B-4を基材F1の片面(コロナ処理面)に、乾燥後の厚さが8μmとなるように塗布して熱硬化処理することにより、基材F1の片面に背面層が設けられた透明フィルムC-4を得た。この透明フィルムC-4の他方の面に、上記と同様に粘着剤層を転写して、表面保護フィルムサンプルA-4を作製した。このサンプルA-4の塑性指数Psは21.8であった(弾性率3.4GPa、硬度0.16GPa)。
コート液B-4を蒸留水でさらに希釈して、固形分濃度1%のコート液B-5を調製した。このコート液B-5を乾燥後の厚みが0.1μmとなるように塗布した点以外はサンプルA-4の作製と同様にして透明フィルムC-5を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-5を作製した。塑性指数Psは17.6であった(弾性率4.9GPa、硬度0.28GPa)。
樹脂R2の固形分100部当たり5部(固形分換算)の滑剤L1を配合した点以外はコート液B-5の調製と同様にして、コート液B-6を調製した。このコート液B-6を乾燥後の厚みが0.1μmとなるように塗布した点以外はサンプルA-4の作製と同様にして透明フィルムC-6を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-6を作製した。塑性指数Psは29.5であった(弾性率2.5GPa、硬度0.09GPa)。
滑剤L1の配合量を樹脂R2の固形分100部当たり10部(固形分換算)とした点以外はサンプルA-6の作製と同様にして透明フィルムC-7を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-7を作製した。塑性指数Psは37.7であった(弾性率2.1GPa、硬度0.05GPa)。
水分散型のアクリル-スチレン系熱硬化型樹脂(DIC社製、商品名「ボンコート(VONCOAT)CG-8490」;以下、「樹脂R3」と表記することもある。)を蒸留水で希釈して、固形分濃度3%のコート液B-8を調製した。このコート液B-8を基材F1の片面(コロナ処理面)に、乾燥後の厚さが0.1μmとなるように塗布して熱硬化処理することにより、基材F1の片面に背面層が設けられた透明フィルムC-8を得た。この透明フィルムC-8の他方の面に、上記と同様に粘着剤層を転写して、表面保護フィルムサンプルA-8を作製した。このサンプルA-8の塑性指数Psは361.7であった(弾性率3.61GPa、硬度0.01GPa)。
樹脂R3と、滑剤L1と、帯電防止成分としての導電性ポリマー(三菱レイヨン社製、重量平均分子量約15×104のポリアニリンスルホン酸の水分散液、商品名「aqua-PASS」;以下、「AS1」と表記することもある。)とを、固形分の質量比が100:2:6となるように混合し、蒸留水で希釈して、固形分濃度3%のコート液B-9を調製した。このコート液B-9を乾燥後の厚さが0.1μmとなるように塗布した点以外はサンプルA-8の作製と同様にして透明フィルムC-9を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-9を作製した。このサンプルA-9の塑性指数Psは298であった(弾性率2.7GPa、硬度0.009GPa)。
樹脂R3と、滑剤L1と、帯電防止成分としての導電性フィラー(多木化学社製の酸化スズゾル、商品名「セラメース S-8」;以下、「AS2」と表記することもある。)とを、固形分の質量比が100:2:300となるように混合し、蒸留水で希釈して、固形分濃度3%のコート液B-10を調製した。このコート液B-10を乾燥後の厚みが0.1μmとなるように塗布した点以外はサンプルA-8の作製と同様にして透明フィルムC-10を得、同様に粘着剤層を転写して表面保護フィルムサンプルA-10を作製した。塑性指数Psは15.4であった(弾性率6.1GPa、硬度0.40GPa)。
10:透明フィルム
12:基材層
14:背面層
20:粘着剤層
30:剥離ライナー
Claims (9)
- 透明な樹脂材料からなる基材層と、該基材層の第一面上に設けられた背面層と、を有する透明フィルムであって、
前記背面層の厚みが1μm以下であり、
スクラッチ試験における前記背面層の破壊開始荷重が50mN以上であり、かつ
前記背面層の摩擦係数が0.4以下である、
透明フィルム。 - 先端曲率半径0.1μmのバーコピッチ型ダイヤモンド製圧子を前記背面層に垂直に押し込んで深さ10nmにおける押し込み弾性率および硬度を測定し、該弾性率を硬度で除して求められる塑性指数Psと、前記基材層について同様に求められる塑性指数Pbとの比(Ps/Pb)が1.5以上である、請求項1に記載の透明フィルム。
- 前記背面層に粘着テープを貼り付け、該粘着テープを前記背面層から剥離速度0.3m/分、剥離角度180度の条件で剥離して測定される剥離力が2N/19mm以上である、請求項1または2に記載の透明フィルム。
- 前記背面層は単層構造であって前記基材層上に直接設けられている、請求項1から3のいずれか一項に記載の透明フィルム。
- 前記背面層は、滑剤を含む樹脂材料からなる、請求項1から4のいずれか一項に記載の透明フィルム。
- 前記背面層は、帯電防止成分を含む樹脂材料からなる、請求項1から5のいずれか一項に記載の透明フィルム。
- 前記帯電防止成分が導電性ポリマーである、請求項6に記載の透明フィルム。
- 前記基材層を構成するベース樹脂は、ポリエチレンテレフタレート樹脂またはポリエチレンナフタレート樹脂である、請求項1から7のいずれか一項に記載の透明フィルム。
- 請求項1から8のいずれか一項に記載の透明フィルムと、
該透明フィルムの、前記背面層とは反対側の表面に設けられた粘着剤層と、
を備える、表面保護フィルム。
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KR1020127003829A KR101767277B1 (ko) | 2009-07-15 | 2010-07-09 | 투명 필름 및 상기 필름을 사용한 표면 보호 필름 |
KR1020197005431A KR20190020854A (ko) | 2009-07-15 | 2010-07-09 | 투명 필름 및 상기 필름을 사용한 표면 보호 필름 |
KR1020177021570A KR101867788B1 (ko) | 2009-07-15 | 2010-07-09 | 투명 필름 및 상기 필름을 사용한 표면 보호 필름 |
KR1020187010412A KR101953345B1 (ko) | 2009-07-15 | 2010-07-09 | 투명 필름 및 상기 필름을 사용한 표면 보호 필름 |
CN201080029908.5A CN102470643B (zh) | 2009-07-15 | 2010-07-09 | 透明膜和使用该膜的表面保护膜 |
KR1020197019193A KR102091367B1 (ko) | 2009-07-15 | 2010-07-09 | 투명 필름 및 상기 필름을 사용한 표면 보호 필름 |
US13/383,703 US20120171444A1 (en) | 2009-07-15 | 2010-07-09 | Transparent film and surface-protection film using said film |
Applications Claiming Priority (2)
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JP2009167208A JP5406615B2 (ja) | 2009-07-15 | 2009-07-15 | 透明フィルムおよび該フィルムを用いた表面保護フィルム |
JP2009-167208 | 2009-07-15 |
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JP (1) | JP5406615B2 (ja) |
KR (5) | KR102091367B1 (ja) |
CN (1) | CN102470643B (ja) |
TW (1) | TWI549818B (ja) |
WO (1) | WO2011007729A1 (ja) |
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CN103733312A (zh) * | 2011-09-16 | 2014-04-16 | 琳得科株式会社 | 切割片用基材膜及切割片 |
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Also Published As
Publication number | Publication date |
---|---|
CN102470643A (zh) | 2012-05-23 |
KR20120037483A (ko) | 2012-04-19 |
KR20170092710A (ko) | 2017-08-11 |
TWI549818B (zh) | 2016-09-21 |
KR102091367B1 (ko) | 2020-03-19 |
KR20190020854A (ko) | 2019-03-04 |
TW201114592A (en) | 2011-05-01 |
JP5406615B2 (ja) | 2014-02-05 |
CN102470643B (zh) | 2015-03-04 |
KR101953345B1 (ko) | 2019-02-28 |
US20120171444A1 (en) | 2012-07-05 |
KR101867788B1 (ko) | 2018-06-15 |
KR20180040737A (ko) | 2018-04-20 |
KR20190082997A (ko) | 2019-07-10 |
JP2011020349A (ja) | 2011-02-03 |
KR101767277B1 (ko) | 2017-08-10 |
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