CN111381298A - Protective film, protective film with adhesive layer, and transparent film with protective film - Google Patents
Protective film, protective film with adhesive layer, and transparent film with protective film Download PDFInfo
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- 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
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- C09J7/00—Adhesives in the form of films or foils
- C09J7/40—Adhesives in the form of films or foils characterised by release liners
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- C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
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Abstract
The invention provides a protective film which can improve the anti-blocking property of a transparent film containing a cycloolefin resin and can perform appearance inspection of the transparent film in a state of being laminated on the transparent film. The solution of the present invention is a protective film which is used for protecting a transparent film containing a cycloolefin resin by laminating the protective film on the transparent film, wherein the protective film can be peeled off, the protective film contains the cycloolefin resin and a styrene elastomer, the surface roughness Ra of the surface of the protective film opposite to the transparent film side is more than 7nm, the surface roughness Rz of the surface of the protective film opposite to the transparent film side is more than 47nm, and the haze of the protective film is less than 10%.
Description
Technical Field
The invention relates to a protective film, a protective film with an adhesive layer and a transparent film with a protective film.
Background
Various optical films have been used for various optical applications, and for example, transparent resin substrates having excellent optical transparency, heat resistance, and the like are used as liquid crystal substrates, polarizing films, and the like in image display devices such as liquid crystal display devices and EL display devices.
For example, patent document 1 discloses an optically transparent material containing a reactive silyl group-containing cycloolefin-based addition polymer having a specific structure as a material constituting such a transparent resin substrate.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2003-212927
Disclosure of Invention
Technical problem to be solved by the invention
The transparent film containing a cycloolefin resin as described in patent document 1 has both excellent transparency and heat resistance, and can be suitably used as an optical film or the like.
The transparent film containing the cycloolefin resin is required to be produced and distributed by winding up in a roll (roll) form. However, when the transparent film containing the cycloolefin resin is wound in a roll form, the transparent films are closely adhered to each other, and therefore, there is a problem that the transparent film is difficult to be pulled out from the roll (that is, blocking resistance is poor).
As a method for solving the problem of blocking resistance of the transparent film containing the cycloolefin resin, for example, a method of subjecting the transparent film to surface treatment or laminating a protective film may be considered.
However, when a transparent film is subjected to a surface treatment in order to solve the problem of blocking resistance, various optical characteristics required as an optical film or the like may be affected.
In the production process and the drawing process of the transparent film, appearance inspection and the like are performed. Therefore, the inventors of the present invention have conceived that if a transparent film containing a cycloolefin resin can be laminated to improve the blocking resistance and the appearance inspection can be performed in a state where a protective film is laminated on the transparent film, the production efficiency of the transparent film containing the cycloolefin resin and the product using the transparent film can be improved.
Under such circumstances, a main object of the present invention is to provide a protective film which can improve the blocking resistance of a transparent film containing a cycloolefin resin and can perform appearance inspection of the transparent film in a state of being laminated on the transparent film. Another object of the present invention is to provide a protective film with an adhesive layer and a transparent film with a protective film, each using the protective film.
Technical solution for solving technical problem
The present inventors have conducted extensive studies to solve the above-mentioned problems of the prior art. As a result, it was found that: a protective film capable of being peeled for protecting a transparent film containing a cycloolefin resin by laminating the film on the transparent film, wherein the protective film contains the cycloolefin resin and a styrene elastomer, and the surface roughness Ra and Rz of the surface on the side opposite to the transparent film side are set to be respectively equal to or more than a predetermined value, and the haze is set to be lower than a predetermined value, so that the blocking resistance of the transparent film containing the cycloolefin resin can be improved, and the appearance of the transparent film can be inspected in a state of being laminated on the transparent film. The present invention has been completed through repeated studies based on the above knowledge.
Namely, the present invention provides inventions in the modes listed below.
the protective film contains a cycloolefin resin and a styrene elastomer,
the surface of the protective film on the side opposite to the transparent film side has a surface roughness Ra of 7nm or more,
the surface of the protective film on the side opposite to the transparent film side has a surface roughness Rz of 47nm or more,
the haze of the protective film is 10% or less.
The protective film according to item 1, wherein the content of the styrene elastomer in the protective film is less than 20% by mass.
The protective film according to item 1 or 2, wherein the styrene elastomer has a styrene content of 15 mass% or more.
The protective film according to any one of the above 1 to 3, wherein at least an adhesive layer is laminated on the surface of the protective film on the transparent film side.
The transparent film with a protective film according to item 5, wherein at least an adhesive layer and a transparent film containing a cycloolefin resin are laminated in this order on the surface of the protective film according to any one of items 1 to 3 on the transparent film side.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a protective film which can improve the blocking resistance of a transparent film containing a cycloolefin resin and can perform appearance inspection of the transparent film in a state of being laminated on the transparent film. Further, the present invention can provide a protective film with an adhesive layer and a transparent film with a protective film, each using the protective film.
Drawings
Fig. 1 is a schematic view of a protective film.
Fig. 2 is a schematic view of a protective film with an adhesive layer.
Fig. 3 is a schematic view of a transparent film with a protective film.
Description of the symbols
1, protecting a film; 2, bonding layer; 3 a transparent film; 20 a protective film with an adhesive layer; 30 a transparent film with a protective film.
Detailed Description
The protective film of the present invention is used for protecting a transparent film containing a cycloolefin resin (hereinafter, may be simply referred to as "transparent film") by laminating the transparent film. The protective film of the present invention is laminated so as to be peelable from a transparent film containing a cycloolefin resin. The protective film of the present invention contains a cycloolefin resin and a styrene elastomer. The surface of the protective film of the present invention on the side opposite to the transparent film side has a surface roughness Ra of 7nm or more and a surface roughness Rz of the surface on the side opposite to the transparent film side of 47nm or more. The protective film of the present invention has a haze of 10% or less. By satisfying these characteristics, the protective film of the present invention can improve the blocking resistance of a transparent film containing a cycloolefin resin (specifically, the blocking resistance of a transparent film provided with the protective film of the present invention), and can perform an appearance inspection of the transparent film in a state of being laminated on the transparent film.
As described above, in the manufacturing process and the drawing process of the transparent film, appearance inspection and the like are performed. Therefore, if the transparent film containing a cycloolefin resin can be laminated to improve the blocking resistance and the appearance inspection can be performed in a state where the protective film is laminated on the transparent film, it can be said that the production efficiency of the transparent film containing a cycloolefin resin and the product using the transparent film can be improved. The protective film of the present invention can perform appearance inspection of the transparent film in a state of being laminated on the transparent film, and therefore can contribute to improvement of production efficiency of the transparent film and further contribute to improvement of production efficiency of a product using the transparent film.
The protective film, the protective film with an adhesive layer, and the transparent film with a protective film according to the present invention will be described in detail below.
In the present specification, the numerical values connected by "to" mean a numerical range including numerical values before and after "to" as a lower limit value and an upper limit value. When a plurality of lower limits and a plurality of upper limits are described separately, arbitrary lower limits and arbitrary upper limits can be selected and connected by "-".
1. Protective film
The protective film of the present invention is used for protecting a transparent film by laminating the protective film on a transparent film containing a cycloolefin resin, and the protective film can be peeled off. Specifically, the protective film of the present invention is used for protecting a transparent film containing a cycloolefin resin during production, transportation, and the like of the transparent film, and is peeled from the transparent film when the transparent film is used as an optical film or the like. As described later, the protective film of the present invention may be used in such a manner that it is laminated on a transparent film with an adhesive layer interposed therebetween and is peeled off from the transparent film together with the adhesive layer.
The protective film of the present invention contains a cycloolefin resin and a styrene elastomer. The cycloolefin resin and the styrene elastomer contained in the protective film of the present invention may be 1 type or 2 or more types, respectively.
In addition, since the protective film of the present invention is laminated on a transparent film containing a cycloolefin resin and is used for protecting the transparent film, the protective film needs to contain the cycloolefin resin. When the protective film contains a cycloolefin resin, in a laminate formed by laminating the protective film and a transparent film containing the cycloolefin resin, the protective film and the transparent film have substantially the same physical properties such as thermal shrinkage rate, and the occurrence of defects (for example, warpage due to a difference in thermal shrinkage rate) during production can be suppressed.
The cycloolefin resin is a polymer compound having a carbon-carbon bond in the main chain and having a cyclic hydrocarbon structure in at least a part of the main chain. The cyclic hydrocarbon structure can be introduced by using, as a monomer, a compound (cyclic olefin) having at least one olefinic double bond in the cyclic hydrocarbon structure, as represented by norbornene or tetracyclododecene.
As the cycloolefin-based resin, there are, according to the production method thereof, an addition (co) polymer of a cycloolefin or a hydride thereof, an addition copolymer of a cycloolefin and α -olefin or a hydride thereof, and a ring-opening (co) polymer of a cycloolefin or a hydride thereof.
The cyclic olefin includes monocyclic cyclic olefins such as cyclopentene, cyclohexene, cyclooctene, cyclopentadiene, 1, 3-cyclohexadiene, and other polycyclic cyclic olefins, and may be used alone or in combination of 2 or more. Particular preference is given to using bicyclo [2.2.1] hept-2-ene (customary name: norbornene) alone.
Specific examples of α -olefins copolymerizable with cyclic olefins include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene and the like, ethylene having 2 to 20 carbon atoms, preferably 2 to 8 carbon atoms, α -olefins and the like, and α -olefins may be used alone or in combination of 2 or more, preferably ethylene alone.
Among the above cycloolefin resins, a cycloolefin resin which is a copolymer of norbornene and ethylene is particularly preferable because the ratio of norbornene and ethylene can be easily adjusted and the glass transition point (Tg) can be easily adjusted by the ratio, because the balance between the characteristics and the cost of an addition copolymer of cycloolefin and α -olefin or a hydrogenated product thereof is good.
The cycloolefin resin may contain other copolymerizable unsaturated monomer component within a range not impairing the characteristics thereof. Further, a thermoplastic resin, an inorganic or organic filler, various compounding agents, and the like may be contained as necessary.
The method for producing the cycloolefin resin is not particularly limited, and examples thereof include a method in which a monomer composition containing a cycloolefin and a α -olefin is introduced into a reactor, a polymerization catalyst and a polymerization solvent are added thereto, a reaction is carried out at a predetermined reaction temperature and reaction pressure to prepare a polymer solution, and then the solvent is removed, and the reaction temperature and reaction pressure can be appropriately set so that the content ratio of the cycloolefin and the α -olefin in the resin falls within a desired range.
Examples of commercially available cycloolefin resins include TOPAS (produced by POLYPLASTIC CORPORATION), APEL (produced by Mitsui chemical Co., Ltd.), ZEONEX (produced by ZEON Co., Ltd., Japan), ZEONOR (produced by ZEON Co., Ltd., Japan), and ARTON (produced by synthetic rubber Co., Ltd., Japan). Among them, TOPAS 6017S-04 and the like can be exemplified as the cycloolefin-based resin having a glass transition point (Tg) of 170 ℃ or higher.
The styrene-based elastomer is a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and/or a hydrogenated product thereof. The styrene-based elastomer is a block copolymer having styrene as a hard segment and a conjugated diene as a soft segment, and can be preferably used without requiring a vulcanization step. Further, a substance obtained by hydrogenation is more preferable because it has high thermal stability.
Examples of the styrene-based elastomer include a styrene-ethylene-butylene-styrene block copolymer (SEBS), a styrene-ethylene-propylene-styrene block copolymer (SEPS), a styrene-isoprene-butadiene-styrene block copolymer (SIBS), and a styrene-ethylene-propylene-styrene copolymer (SEEPS).
From the viewpoint of transparency, the difference in refractive index between the styrene-based elastomer used in the present invention and the cycloolefin-based resin is preferably small, specifically, the difference in refractive index is preferably within ± 0.02, more preferably within ± 0.015.
In the protective film of the present invention, the styrene content in the styrene-based elastomer is preferably 15 mass% or more, more preferably 30 mass% or more, and still more preferably 50 mass% or more, from the viewpoint of the blocking resistance and the appearance inspection.
In the protective film of the present invention, the content of the styrene-based elastomer in the protective film is preferably 0.1 mass% or more, more preferably 0.5 mass% or more, and further preferably 1 mass% or more, from the viewpoint of the blocking resistance and the appearance inspection. The content of the styrene-based elastomer is preferably less than 20% by mass, more preferably 15% by mass or less, and still more preferably 10% by mass or less. In the protective film of the present invention, it is particularly preferable that the styrene-based elastomer content of 15 mass% or more, further 30 mass% or more, and further 50 mass% or more satisfies the above content.
In the protective film of the present invention, various compounding agents may be added as necessary within a range not impairing the properties of the cycloolefin resin and the styrene elastomer. The various compounding agents are not particularly limited as long as they are used for optical films and the like, and examples thereof include antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, lubricants, antistatic agents, flame retardants, colorants such as dyes and pigments, compounding agents such as near infrared absorbers and fluorescent brighteners, and fillers.
The protective film of the present invention has a haze of 10% or less, and may be colorless or colored and transparent as long as the effect of the present invention on the appearance inspection is not impaired.
The haze of the protective film of the present invention is 10% or less. From the viewpoint of the blocking resistance and the appearance inspection, the haze of the protective film of the present invention is more preferably 5% or less, and still more preferably 3% or less. The haze of the protective film was measured according to the JIS K7136, and the specific measurement method was as described in examples. In the present invention, the haze of the protective film can be adjusted by, for example, adjusting the types and contents of the cycloolefin resin and the styrene elastomer contained in the protective film.
The total light transmittance of the protective film of the present invention is not particularly limited as long as the effects of the present invention are not impaired, but is preferably 85% or more, and more preferably 90% or more, from the viewpoint of the blocking resistance and the appearance inspection. The total light transmittance of the protective film was measured according to the regulations of JIS K7361-1, and the specific measurement method was as described in examples. In the present invention, the total light transmittance of the protective film can be adjusted by, for example, adjusting the types and contents of the cycloolefin-based resin and the styrene-based elastomer contained in the protective film.
The surface roughness Ra (arithmetic mean height) of the surface of the protective film of the present invention on the side opposite to the transparent film side is preferably 7nm or more, more preferably 10nm or more, further preferably 20nm or more, and further preferably 50nm or less, more preferably 45nm or less, from the viewpoint of the blocking resistance and the appearance inspection. The surface roughness Ra of the protective film was measured according to the provisions of JIS R1683, and the specific measurement method was as described in examples. In the present invention, the surface roughness Ra of the protective film can be adjusted by, for example, adjusting the types and contents of the cycloolefin resin and the styrene elastomer contained in the protective film.
The surface roughness Rz (maximum height) of the surface of the protective film of the present invention on the side opposite to the transparent film side is preferably 47nm or more, more preferably 85nm or more, further preferably 180nm or more, and further preferably 250nm or less, more preferably 230nm or less, from the viewpoint of the blocking resistance and the appearance inspection. The surface roughness Rz of the protective film was measured according to the standard of JIS R1683, and the specific measurement method was as described in examples. In the present invention, the surface roughness Rz of the protective film can be adjusted by, for example, adjusting the types and contents of the cycloolefin resin and the styrene elastomer contained in the protective film.
From the viewpoint of smoothness, the static friction coefficient of the surface of the protective film of the present invention on the side opposite to the transparent film side is preferably 10.0 or less, more preferably 5.0 or less, and even more preferably 2.0 or less. The static friction coefficient of the protective film was measured according to the ASTM-D-1894, and the specific measurement method was as described in examples. In the present invention, the static friction coefficient of the protective film can be adjusted by, for example, adjusting the types and contents of the cycloolefin resin and the styrene elastomer contained in the protective film.
The thickness of the protective film of the present invention is not particularly limited as long as the effect of the present invention is not inhibited, and is, for example, preferably 20 to 300 μm, and more preferably 30 to 200 μm, from the viewpoint of the blocking resistance and the appearance inspection.
The protective film of the present invention can be formed using a resin composition containing a cycloolefin resin and a styrene elastomer. Specifically, a polymer solution of a cyclic olefin resin and a styrene elastomer are mixed, and the solvent is removed under high-temperature and reduced-pressure conditions to obtain a molten mixture. The mixture was extruded to produce pellets. Then, a protective film having a predetermined thickness, preferably 20 to 300 μm, can be formed by a T-die method or a rolling method using the pellets. However, the production method is not limited to this, and for example, a styrene-based elastomer may be added to a cyclic olefin resin by melt kneading, and then pellets may be produced.
The protective film of the present invention is preferably formed by biaxial stretching of the resin composition. In the biaxial stretching, for example, a film of the resin composition is formed by stretching in the MD direction (machine direction) and the TD direction (direction orthogonal to the MD). By performing biaxial stretching, the toughness is higher than that of an unstretched protective film, and the film can be inhibited from cracking alone.
2. Protective film with adhesive layer
As shown in the schematic view of fig. 2, the protective film with an adhesive layer of the present invention is a laminate in which at least an adhesive layer 2 is laminated on the surface of the transparent film side (i.e., the side laminated with the transparent film) of the protective film 1 of the present invention. Details of the protective film are as described above.
The adhesive layer is made of an adhesive having transparency. The adhesive is a layer that adheres the protective film to the transparent film in such a manner that the protective film can be peeled off from the transparent film. As the adhesive, a known adhesive can be used, and for example, an adhesive using a rubber-based polymer such as an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyvinyl ether, a vinyl acetate-vinyl chloride copolymer, a modified polyolefin, an epoxy-based, a fluorine-containing, a natural rubber, or a synthetic rubber as a base polymer can be appropriately selected and used. In particular, an acrylic adhesive is preferably used from the viewpoint of excellent optical transparency, excellent adhesion properties such as favorable wettability, cohesiveness and adhesiveness, and excellent weather resistance and heat resistance.
The method for forming the adhesive layer is not particularly limited, and examples thereof include: a method (transfer method) in which an adhesive composition is applied to a release liner, dried, and then transferred to a protective film; a method in which an adhesive composition is directly applied to a protective film and dried (direct printing method); and a method using co-extrusion, etc. In addition, as the adhesive, a tackifier, a plasticizer, a filler, an antioxidant, an ultraviolet absorber, a silane coupling agent, and the like may be used as appropriate as needed.
The thickness of the adhesive layer is not particularly limited, but is preferably 5 to 100. mu.m, more preferably 10 to 50 μm, and still more preferably 15 to 35 μm.
3. Transparent film with protective film
As shown in the schematic view of fig. 3, the transparent film with a protective film of the present invention is a laminate in which at least an adhesive layer 2 and a transparent film 3 containing a cycloolefin resin are laminated in this order on the surface of the protective film 1 of the present invention on the transparent film side (i.e., on the side laminated with the transparent film). Details of the protective film and the adhesive layer are as described above.
The transparent film containing a cycloolefin resin is not particularly limited, and a known film such as an optical film used in an input device such as a liquid crystal display device, an EL display device, or a touch panel can be used. That is, the protective film of the present invention can be used together with a known adhesive layer for a known transparent film containing a cycloolefin resin to protect the transparent film.
The cycloolefin-based resin contained in the transparent film is not particularly limited, and examples thereof include the cycloolefin-based resins described above. The transparent film may contain the above-mentioned styrene-based elastomer in addition to the cycloolefin-based resin.
The thickness of the transparent film is not particularly limited, but is preferably 10 to 100. mu.m, more preferably 13 to 50 μm, and still more preferably 23 to 40 μm.
In the transparent film with a protective film of the present invention, the protective film is laminated together with the adhesive layer in order to protect the transparent film in the production, distribution, and the like of the transparent film containing the cycloolefin resin, and when the transparent film is used as an optical film or the like, the protective film is peeled off from the transparent film together with the adhesive layer.
Examples
The present invention will be described in detail below with reference to examples and comparative examples. However, the present invention is not limited to the examples.
Examples 1 to 4 and comparative examples 1 and 2
< production of protective film >
Use of
A cycloolefin copolymer (manufactured by POLYPLASTIC CORPORATION) as a cycloolefin resin and SEPTON series (manufactured by KURARARARARAY) as a styrene elastomer were extruded (extrusion temperature 310 ℃ C., discharge rate 20kg/hr) from a hanger die (300mm width, gap 1.3mm) while kneading (screw rotation speed 150rpm) so that the styrene elastomer content and the styrene elastomer styrene content satisfied the values shown in Table 1, respectively, and wound into a roll to obtain each protective film having a thickness of 80 μm.
< production of transparent film with protective film >
On one surface (surface opposite to the surface on which the surface roughness Ra, Rz and the static friction coefficient were measured) of each of the obtained protective films, an acrylic adhesive (100 parts by weight of an acrylic adhesive: COPONYLN-4900, an acrylic adhesive manufactured by japan synthetic chemical industry, 1 part by weight of an epoxy cross-linking agent ("TETRAD C", manufactured by mitsubishi gas chemical corporation) was applied so that the thickness after drying became 25 μm, to prepare an adhesive composition, and the adhesive composition was dried to obtain a surface protective film with an adhesive layer.
Next, the adhesive layer side of the surface protective film with an adhesive layer was laminated with a cycloolefin-based transparent film (trade name ZF-14, thickness 50 μm, manufactured by ZEON Co., Ltd., Japan) by a nip roll to obtain a protective film-attached transparent film.
< full light transmittance >
The total light transmittance of each of the protective films obtained above was measured as a test piece in accordance with the specification of JIS K7361-1. A haze meter NDH5000 (manufactured by japan electro-chromic industries, ltd.) was used for measuring the total light transmittance. The results are shown in Table 1.
< haze >
Each of the protective films obtained above was used as a test piece, and the haze of the protective film was measured according to the specification of JIS K7136. For the measurement of the haze, a haze meter NDH5000 (manufactured by nippon electrochromic industries) was used. The results are shown in Table 1.
< surface roughness Ra, Rz >
Specifically, in the measurement of the surface roughness Ra and Rz, a scanning probe microscope SPM-9600 (shimadzu corporation) was used to calculate the arithmetic average height and the maximum height in a region of 50 μm × 50 μm on the surface of the protective film to be measured, and the results are shown in table 1.
< coefficient of static friction >
Specifically, in the measurement of the static friction coefficient, a surface texture measuring machine, triobogear HEIDON14FW (manufactured by new eastern science corporation) was used, the test piece was fixed to a moving table, the test force (load) when the surfaces of the protective film were slid on each other was measured, and the friction coefficient was calculated from the following formula under the conditions of a plate indenter 63.5 × 63.5.5 mm, a load 200gf, a surface pressure of 0.49kPa, a speed of 5.0mm/sec, and a moving distance of 50mm, and the results are shown in table 1.
Coefficient of static friction: μ s-peak test force/load weight
Coefficient of dynamic friction: μ k-average test force/load weight
< evaluation of blocking resistance >
The transparent films with the protective films were prepared, and the protective film side and the transparent film side were superposed on each other and set on a glass plate to prepare a test sample (the transparent film side was positioned on the glass plate side). Next, the test sample was pressed with a finger from the protective film, and the appearance of a watermark (water mark) at the interface between the protective film and the transparent film was visually confirmed immediately after releasing the finger. In addition, in the test sample, evaluation was performed so that no air gap (void) was formed at the overlapped interface. The blocking resistance was judged according to the following criteria. The results are shown in Table 1.
(criteria for determination)
A: no watermark of a size that can be visually recognized was found
B: although a watermark of a size that can be visually recognized was found, the watermark disappeared within 10 seconds
C: a watermark of a size that can be visually identified is found
< appearance inspection >
Using each of the transparent films with the protective films obtained above, appearance inspection of the transparent film was performed by the following method, and whether or not the appearance inspection of the transparent film could be performed in a state where the protective film was laminated was evaluated. The criteria for determination are as follows. The results are shown in Table 1.
(inspection method)
The transparent film with the protective film was subjected to an appearance inspection under transmission of light from a three-wavelength fluorescent lamp.
(criteria for determination)
A: in the above inspection method, 0.1mm of the transparent film can be inspected2And appearance defects such as foreign matter, scars, and stains.
C: 0.1mm of the transparent film could not be inspected in the above inspection method2And appearance defects such as foreign matter, scars, and stains.
[ Table 1]
Claims (5)
1. A protective film characterized by:
the protective film is used for being laminated on a transparent film containing a cycloolefin resin to protect the transparent film, and the protective film can be peeled off,
the protective film contains a cycloolefin resin and a styrene elastomer,
the surface of the protective film on the side opposite to the transparent film side has a surface roughness Ra of 7nm to 50nm,
the surface of the protective film on the side opposite to the transparent film side has a surface roughness Rz of 47nm to 250nm,
the haze of the protective film is 10% or less.
2. The protective film of claim 1, wherein:
the content of the styrene elastomer contained in the protective film is less than 20 mass%.
3. The protective film according to claim 1 or 2, wherein:
the styrene elastomer has a styrene content of 15 mass% or more.
4. The utility model provides a protection film with adhesive linkage which characterized in that:
the protective film according to any one of claims 1 to 3, wherein at least an adhesive layer is laminated on the surface of the protective film on the transparent film side.
5. A transparent film with a protective film is characterized in that:
the protective film according to any one of claims 1 to 3, wherein at least an adhesive layer and a transparent film comprising a cycloolefin resin are laminated in this order on the surface on the transparent film side.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018243546A JP6553800B1 (en) | 2018-12-26 | 2018-12-26 | Protective film, protective film with adhesive layer, and transparent film with protective film |
| JP2018-243546 | 2018-12-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111381298A true CN111381298A (en) | 2020-07-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911301446.7A Pending CN111381298A (en) | 2018-12-26 | 2019-12-17 | Protective film, protective film with adhesive layer, and transparent film with protective film |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6553800B1 (en) |
| KR (1) | KR102385275B1 (en) |
| CN (1) | CN111381298A (en) |
| TW (1) | TWI748289B (en) |
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| CN107849399A (en) * | 2015-08-06 | 2018-03-27 | 东丽株式会社 | Adhesive film and adhesive film cylinder |
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| JP4367082B2 (en) * | 2002-10-25 | 2009-11-18 | 三菱化学ポリエステルフィルム株式会社 | Release agent and release sheet |
| JP4784511B2 (en) * | 2004-09-29 | 2011-10-05 | 東レ株式会社 | Laminated film |
| JP4701750B2 (en) * | 2005-03-02 | 2011-06-15 | 東レ株式会社 | Laminated film for protecting polarizing plates |
| JP2008221560A (en) * | 2007-03-12 | 2008-09-25 | Toray Ind Inc | Laminated film |
| JP5615675B2 (en) * | 2010-11-19 | 2014-10-29 | グンゼ株式会社 | Surface protection film |
| GB201104565D0 (en) * | 2011-03-17 | 2011-05-04 | Dupont Teijin Films Us Ltd | Polyester films |
| CN103245981B (en) * | 2012-02-14 | 2017-03-01 | 大日本印刷株式会社 | Optical laminate, polaroid and image display device |
| JP6424033B2 (en) * | 2014-07-15 | 2018-11-14 | デクセリアルズ株式会社 | Cyclic olefin resin composition film |
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2018
- 2018-12-26 JP JP2018243546A patent/JP6553800B1/en active Active
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2019
- 2019-11-13 KR KR1020190144942A patent/KR102385275B1/en active IP Right Grant
- 2019-11-26 TW TW108143015A patent/TWI748289B/en active
- 2019-12-17 CN CN201911301446.7A patent/CN111381298A/en active Pending
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| JP2004156048A (en) * | 2004-02-09 | 2004-06-03 | Polyplastics Co | Cyclic olefin-based resin composition film |
| JP2013029792A (en) * | 2011-07-29 | 2013-02-07 | Fujifilm Corp | Cyclic olefin-based resin film, polarizing plate, and liquid crystal display unit |
| CN105531609A (en) * | 2013-09-12 | 2016-04-27 | 富士胶片株式会社 | Optical film, transparent conductive film, touch panel, surface protection film and display device |
| CN105829099A (en) * | 2013-12-25 | 2016-08-03 | 日本瑞翁株式会社 | Laminated film, and method for manufacturing composite film |
| CN107849399A (en) * | 2015-08-06 | 2018-03-27 | 东丽株式会社 | Adhesive film and adhesive film cylinder |
| CN106908866A (en) * | 2016-06-03 | 2017-06-30 | 住华科技股份有限公司 | Optical film set and method for preventing adhesion |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2020105285A (en) | 2020-07-09 |
| JP6553800B1 (en) | 2019-07-31 |
| TWI748289B (en) | 2021-12-01 |
| TW202023822A (en) | 2020-07-01 |
| KR102385275B1 (en) | 2022-04-08 |
| KR20200080128A (en) | 2020-07-06 |
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