WO2008124223A1 - Sheet-like optical film package - Google Patents
Sheet-like optical film package Download PDFInfo
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- WO2008124223A1 WO2008124223A1 PCT/US2008/055605 US2008055605W WO2008124223A1 WO 2008124223 A1 WO2008124223 A1 WO 2008124223A1 US 2008055605 W US2008055605 W US 2008055605W WO 2008124223 A1 WO2008124223 A1 WO 2008124223A1
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- Prior art keywords
- protective film
- optical
- film
- sheet
- optical film
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- 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
-
- G02B1/105—
Definitions
- the present invention relates to a sheet-like optical film package.
- Mini-size optical films are individually small and bad in the handleability and therefore, these are often conveyed in the form of a sheet-like optical film package where a plurality of optical films are carried on a base protective film having a pressure-sensitive adhesive surface.
- a plurality of optical films are carried on a base protective film having a pressure-sensitive adhesive surface.
- development of an optical film subjected to non-flattening treatment such as matte treatment applied to the back surface is proceeding.
- the contact area between the optical film and the adhesive surface of the base protective film decreases and in turn, the adhesive force decreases. Accordingly, in order to hold such an optical film on the base protective film, a strong pressure-sensitive adhesive base protective film is required.
- the contamination-preventing layer prevents the adhesive extended from the cut face of an optical film from adhering to and contaminating the adhesive film. It is also disclosed that a back surface-treating agent is coated so as to adjust the unwinding property of the adhesive film.
- this document refers neither to a technique of carrying a plurality of optical films on the adhesive film for the protection of an optical sheet nor a problem that when carried, the exposed adhesive surface between optical films adheres to the back surface of the base protective film of the package on the upper side and handling becomes difficult.
- Kokai No. 2004-184572 discloses a sheet-like optical element package body comprising a base film having supported thereon a plurality of sheet-like optical elements, where a protective film is disposed on the optical element.
- This package body is characterized in that the protective film covers the optical element with a margin and the separation of the protective film is thereby facilitated.
- the self-adhesive surface is not exposed due to the protective film margin between optical films and there is not present a problem that the package body on the lower side adheres to the package body on the upper side and handling becomes difficult.
- the present invention provides:
- a sheet-like optical film package comprising a base protective film, a plurality of optical films disposed on the base protective film, and a second protective film on each of the optical films, wherein one surface of the base protective film is a pressure-sensitive adhesive surface, the plurality of optical films are disposed so as to be spaced from each other on the adhesive surface, and at least a part of the adhesive surface is thereby exposed, and wherein another surface of the base protective film is a low-adherent surface.
- Fig. 1 shows a cross-sectional view showing one embodiment of the sheet-like optical film package of the present invention.
- Fig. 2 shows a cross-sectional view showing one embodiment of the stack of sheet- like optical film packages.
- the pressure-sensitive adhesive surface exposed between respective optical films in the package on the lower side is not substantially fixed to the back surface of the base protective film of the package on the upper side at the stacking of packages and therefore, there arises no problem in the handling.
- the present invention is described below based on its preferred embodiments, but it should be understood that the present invention is not limited to these specific embodiments.
- Fig. 1 is a cross-sectional view showing one embodiment of the sheet-like optical film package of the present invention.
- the sheet-like optical film package 10 comprises a base protective film 1, a plurality of optical films 2 disposed on the base protective film 1, and a second protective film 3 on each of the optical films 2.
- One surface of the base protective film 1 is a pressure-sensitive adhesive surface (A) and another surface is a low- adherent surface (B).
- the plurality of optical films 2 are disposed so as to be spaced from each other on the adhesive surface and at least a part of the adhesive surface is thereby exposed.
- Fig. 2 is a cross-sectional view showing one embodiment of the sheet-like optical film package stack.
- the sheet-like optical film package stack 20 is obtained by stacking one on another a plurality of the sheet-like optical film packages 10, 10' and 10" of the present invention.
- the exposed adhesive surface (A) of the sheet-like optical film package 10" contacts the low-adherent surface (B) of the sheet-like optical film package 10' and can be easily separated. Therefore, the sheet-like optical film packages 10, 10' and 10" of the stack 20 are not substantially fixed to each other and the handling is easy.
- Base Protective Film is a cross-sectional view showing one embodiment of the sheet-like optical film package stack.
- the sheet-like optical film package stack 20 is obtained by stacking one on another a plurality of the sheet-like optical film packages 10, 10' and 10" of the present invention.
- the exposed adhesive surface (A) of the sheet-like optical film package 10" contacts the low-adherent surface (B) of the sheet-like optical film package
- one surface is a pressure-sensitive adhesive surface and by virtue of its adhesive force, a plurality of optical films can be carried on one film, facilitating the transportation. Also, at the stacking of sheet-like optical film packages, the adhesive surface exposed between respective optical film contacts the back surface of the base protective film, but the back surface of the base protective film is a low-adherent surface and therefore, packages are virtually not fixed to each other.
- the base protective film is usually obtained by coating a pressure-sensitive adhesive layer on one surface of a plastic substrate and subjecting the opposite surface of the substrate to a release treatment.
- the plastic substrate may be, for example, a polyolefin such as polypropylene and polyethylene, a polyester, an acrylic or silicone resin.
- the substrate is not limited to a plastic and may be a glass.
- the pressure-sensitive adhesive is not particularly limited as long as it has an adhesive force high enough to hold the optical film and is substantially low-adherent for the base protective film surface subjected to a release treatment, and a pressure-sensitive adhesive such as acryl-based pressure-sensitive adhesive, rubber-based pressure-sensitive adhesive and silicone-based pressure-sensitive adhesive may be used.
- the adhesive force of the adhesive surface of the base protective film to the optical film is, for example, when separated at a peeling speed of 2.3 m/min (90 inch/min) in the 180° peel measurement, 40 milli-Newton/25 millimeter-width (mN/25 mm-width) or more.
- the adhesive force of the adhesive surface of the base protective film to the surface subjected to a release treatment (back surface) is, for example, when separated at a peeling speed of 2.3 m/min (90 inch/min) in the 180° peel measurement, 100 milli-Newton/25 millimeter- width (mN/25 mm-width) or less.
- the release treatment of the base protective film may be performed, for example, by either a method of imparting a physical structure to lower the adhesion area with the adhesive surface or a method of forming a low-adherent surface by applying a chemical treatment.
- Examples of the method of imparting a physical structure include a method of imparting a non- flattening surface by a matte treatment, an embossing treatment or a bead coating treatment.
- Examples of the method for the chemical treatment include a method of coating a release agent such as silicone-based release agent, fluorine-based release agent and long-chain alkyl-containing polymer release agent.
- the release treatment of the base protective film may be applied to the entire low- adherent surface (B) of the base protective film or may be applied partially.
- the portion (C) in contact with the second protective film of the sheet-like optical film package 10" on the lower side can be made to be not subjected to the release treatment.
- the portion (C) not subjected to the release treatment ensures high light transmittance of the base protective film and the defect inspection of the optical film can be performed with good precision in the state of the optical film being laminated to the base protective film.
- the optical films packaged in the package of the present invention are disposed so as to be spaced from each other on the base protective film.
- the optical film may be, for example, a light-diffusing film, a brightness-enhancing film, an antireflection plate or a lens film.
- the optical film is usually formed of a polyester film such as polyethylene terephthalate (PET), or a transparent plastic film such as an acryl-based film, a polycarbonate film.
- PET polyethylene terephthalate
- the optical film has, for example, on the front surface of the film, a non-flat surface such as prism, bead coating, matted surface and structure surface formed by kneading a matte into a skin layer.
- the back surface of the optical film may be a flat surface but is subjected to a matte treatment for preventing optical interference unevenness or treated with a fluorine-based release agent such as polytetrafluoroethylene (PTFE).
- PTFE polytetrafluoroethylene
- the back surface of the optical film is disposed on the self-adhesive surface of the base protective film and the front surface of the optical film is covered with the second protective film.
- a pressure-sensitive adhesive having strong adhesive property must be selected as the pressure-sensitive adhesive used for the adhesive surface of the base protective film.
- the second protective film covers the optical film to protect the optical film on the side opposite the base protective film carrying the optical film.
- the second protective film has a function of preventing the optical film from being scratched by the non-flat surface such as matted back surface of the base protective film or being contaminated by a release agent coated on the back surface of the base protective film.
- the second protective film usually protects the front surface of the optical film.
- the second protective film must have a shape corresponding to the shape of the non-flat surface such as prism and bead coating on the front surface of the optical film so as to tightly contact the non-flat surface and must also have a sufficiently high adhesive force to the non-flat surface.
- the second protective film may be the same protective film as the base protective film, such as plastic substrate having provided thereon a pressure-sensitive adhesive layer, but the back surface need not be made low-adherent. Also, the base protective film adheres over a plurality of optical films, but the individual second protective film adheres to each optical film. Incidentally, the second protective film has at least the same size as the size of the optical film so as to protect the optical film or may cover the optical film with a slight margin. Production of Sheet-Like Optical Film Package
- the sheet-like optical film package of the present invention can be produced, for example, as follows. In one method, first, an optical film material containing a plurality of optical film elements is prepared, and a protective film material containing second protective films corresponding to the plurality of optical films is covered thereon. Next, the above- described base protective film is prepared and a laminate of the optical film material and the second protective film material is disposed on the adhesive surface of the base protective film. The thus-obtained laminate is cut by the half cut such that the optical film material and the second protective film material are divided into a plurality of optical films and a plurality of second optical films, while taking care not to cut the base protective film, whereby the sheet-like optical film package of the present invention can be obtained.
- an optical film material containing a plurality of optical film elements is prepared and a protective film material containing second protective films corresponding to the plurality optical films is covered thereon.
- This laminate is cut into individual laminates of optical film and second optical film, and these individual laminates cut are disposed on the adhesive surface of the above-described base protective film, whereby the sheet-like optical package of the present invention can be obtained.
- Example 1 The present invention is described below based on Examples, but it should be understood that the present invention is not limited to these specific Examples.
- Example 1 Example 1 :
- a base protective film of 400x250 cm was formed by coating an acryl-based pressure-sensitive adhesive (PSA) layer to a thickness of 3 ⁇ m on the front surface of a 75 ⁇ m-thick polyethylene terephthalate (PET) film with the back surface being subjected to a matte treatment.
- PSA pressure-sensitive adhesive
- PET polyethylene terephthalate
- Optical Film TBEF2-M-65i(90/24) produced by Sumitomo 3 M Limited, having a size of 350x200 cm and a thickness of 65 ⁇ m (shape)
- the adhesive force by which the base protective film can hold the optical film was measured according to JIS-Z0237.
- the optical film disposed as above was press-bonded to the base protective film under a pressure of 0.37 to 0.39 MPa and left standing still in the atmosphere of JIS-K7100 for 24 hours or more after the press-bonding. Thereafter, the films were separated at a peel angle of 180° and a peeling speed of 2.3 m/min (90 inch/min) and the peel force was measured over 5 seconds. The value stabilized during this measurement over 5 seconds was defined as the "optical film holding power".
- the adhesive force by which the front surface (adhesive surface) of the base protective film adheres to the back surface (low-adherent surface) of the base protective film was measured according to JIS-Z0237.
- Two sheets of the base protective film were prepared, stacked such that the front surface of one base protective film adheres to the back surface of another base protective film, and press-bonded under a pressure of 0.37 to 0.39 MPa.
- the laminate was left standing still in the atmosphere of JIS-K7100 for 24 hours or more after the press-bonding. Thereafter, the films were separated at a peel angle of 180° and a peeling speed of 2.3 m/min (90 inch/min) and the peel force was measured over 5 seconds. The value stabilized during this measurement over 5 seconds was defined as the "base protective film fixing force".
- a laminate of base protective film and optical film stacked as above was prepared and a second protective film was further laminated on the optical film surface.
- the second protective film L-7325P, trade name, produced by Hitachi Chemical Co., Ltd. was used.
- Half cutting was performed using a pinnacle die from the second protective film side such that the second protective film and the optical film each was completely cut and the base protective film was not cut.
- the sheet-like optical film package was passed once through a nip roller at a nip pressure of 0.38 MPa and when the package was placed upright and the laminate sheet did not drop off, the package was judged to have a sufficiently high holding ability. Also, whether packages stacked by arranging the front surface of one package sheet to face the back surface of another package sheet are fixed to each other was confirmed. The fixing was confirmed by stacking 10 package sheets one on another and checking whether two package sheets out of these can be displaced from each other with a finger.
- Example 2 The same operation as in Example 1 was performed except for changing the thickness of the acryl-based pressure-sensitive adhesive to 5 ⁇ m. The results are shown in Table 1 below.
- Example 3 The results of optical film holding power, base protective film fixing force, laminate sheet holding ability and presence or absence of mutual fixing of packages, measured as above, are shown in Table 1 below.
- Example 2 The same operation as in Example 1 was performed except for changing the thickness of the acryl-based pressure-sensitive adhesive to 5 ⁇ m. The results are shown in Table 1 below.
- Example 3 Example 3 :
- Example 1 The same operation as in Example 1 was performed except for changing the thickness of the acryl-based pressure-sensitive adhesive to 10 ⁇ m. The results are shown in Table 1 below. Comparative Example A:
- Example 2 The same operation as in Example 1 was performed except that LDl 120-75 produced by Hitachi Chemical Co., Ltd. was used as the base protective film.
- This film is a film in which a pressure-sensitive adhesive having strong adhesive force is coated on a
- Example 2 The same operation as in Example 1 was performed except that LD 1010-75 produced by Hitachi Chemical Co., Ltd. was used as the base protective film.
- This film is a film in which a pressure-sensitive adhesive having adhesive force weaker than that of
- LD-1120-75 produced by Hitachi Chemical Co., Ltd. is coated on a 75 ⁇ m-thick polypropylene substrate and the back surface is not subjected to a release treatment such as matte treatment, and does not have a low-adherent surface. The results are shown in
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Abstract
A sheet-like optical film package comprising a base protective film, a plurality of optical films disposed on the base protective film, and a second protective film on each of the optical films, wherein one surface of the base protective film is a pressure-sensitive adhesive surface, the plurality of optical films are disposed with being spaced with each other on the adhesive surface, and at least a part of the adhesive surface is thereby exposed, and wherein another surface of the base protective film is a low-adherent surface.
Description
SHEET-LIKE OPTICAL FILM PACKAGE
Background
The present invention relates to a sheet-like optical film package. Mini-size optical films are individually small and bad in the handleability and therefore, these are often conveyed in the form of a sheet-like optical film package where a plurality of optical films are carried on a base protective film having a pressure-sensitive adhesive surface. By stacking a plurality of these sheet-like optical film packages one on another, many optical films can be transported. With recent diversification of optical films, as a product for eliminating the optical interference unevenness, development of an optical film subjected to non-flattening treatment such as matte treatment applied to the back surface is proceeding. In such a back surface-treated optical film, the contact area between the optical film and the adhesive surface of the base protective film decreases and in turn, the adhesive force decreases. Accordingly, in order to hold such an optical film on the base protective film, a strong pressure-sensitive adhesive base protective film is required.
However, when a plurality of optical films are carried on the base protective film having a pressure-sensitive adhesive surface, the optical films are spaced from each other and the adhesive surface is exposed. If a strong pressure-sensitive adhesive base protective film is used in such a package, there arises a problem that at the time of transporting a plurality of packages by stacking these one on another, the exposed adhesive surface of the package on the lower side adheres to the back surface of the base protective film of the package on the upper side and the handling becomes difficult. Japanese Unexamined Patent Publication (Kokai) No. 2003-27019 discloses a pressure-sensitive adhesive film for the protection of an optical sheet, where a pressure- sensitive adhesive layer is provided on a plastic film and a contamination-preventing layer is provided on the opposite surface. The contamination-preventing layer prevents the adhesive extended from the cut face of an optical film from adhering to and contaminating the adhesive film. It is also disclosed that a back surface-treating agent is coated so as to adjust the unwinding property of the adhesive film. However, this document refers neither to a technique of carrying a plurality of optical films on the adhesive film for the protection of an optical sheet nor a problem that when carried, the exposed adhesive
surface between optical films adheres to the back surface of the base protective film of the package on the upper side and handling becomes difficult.
Kokai No. 2004-184572 discloses a sheet-like optical element package body comprising a base film having supported thereon a plurality of sheet-like optical elements, where a protective film is disposed on the optical element. This package body is characterized in that the protective film covers the optical element with a margin and the separation of the protective film is thereby facilitated. On the other hand, in this constitution, the self-adhesive surface is not exposed due to the protective film margin between optical films and there is not present a problem that the package body on the lower side adheres to the package body on the upper side and handling becomes difficult.
Summary
The present invention provides:
(1) A sheet-like optical film package comprising a base protective film, a plurality of optical films disposed on the base protective film, and a second protective film on each of the optical films, wherein one surface of the base protective film is a pressure-sensitive adhesive surface, the plurality of optical films are disposed so as to be spaced from each other on the adhesive surface, and at least a part of the adhesive surface is thereby exposed, and wherein another surface of the base protective film is a low-adherent surface.
(2) The sheet-like optical film package as described in (1) above, wherein the base protective film comprises a plastic film having on one surface thereof a pressure- sensitive adhesive layer, with the opposite surface thereof subjected to a release treatment.
(3) The sheet-like optical film package as described in (2) above, wherein the release treatment is a non- flattening surface-imparting treatment selected from the group consisting of a matte treatment, an embossing treatment and a bead coating treatment.
(4) The sheet-like optical film package as described in (2) above, wherein the release treatment is coating of a release agent selected from the group consisting of a silicone-based release agent, a fluorine-based release agent and a long-chain alkyl- containing polymer release agent.
(5) The sheet-like optical film package as described in any one of (1) to (4) above, wherein the back surface of each of the optical films contacts the base protective
film and the front surface of each of the optical films contacts the second protective film.
(6) A stack obtained by stacking on one another a plurality of the sheet-like optical film packages described in any one of (1) to (5) above, wherein the low-adherent surface of the base protective film in one sheet-like optical film package contacts the second protective film in the next sheet-like optical film package.
Brief Description of the Drawings
Fig. 1 shows a cross-sectional view showing one embodiment of the sheet-like optical film package of the present invention. Fig. 2 shows a cross-sectional view showing one embodiment of the stack of sheet- like optical film packages.
Description of Numerical References
1 Base protective film
2 Optical film 3 Second protective film
10 Sheet-like optical film package
20 Stack of sheet-like optical film packages
Detailed Description In the sheet-like optical film package of the present invention, the pressure- sensitive adhesive surface exposed between respective optical films in the package on the lower side is not substantially fixed to the back surface of the base protective film of the package on the upper side at the stacking of packages and therefore, there arises no problem in the handling. The present invention is described below based on its preferred embodiments, but it should be understood that the present invention is not limited to these specific embodiments.
Fig. 1 is a cross-sectional view showing one embodiment of the sheet-like optical film package of the present invention. The sheet-like optical film package 10 comprises a base protective film 1, a plurality of optical films 2 disposed on the base protective film 1, and a second protective film 3 on each of the optical films 2. One surface of the base protective film 1 is a pressure-sensitive adhesive surface (A) and another surface is a low-
adherent surface (B). The plurality of optical films 2 are disposed so as to be spaced from each other on the adhesive surface and at least a part of the adhesive surface is thereby exposed.
Fig. 2 is a cross-sectional view showing one embodiment of the sheet-like optical film package stack. The sheet-like optical film package stack 20 is obtained by stacking one on another a plurality of the sheet-like optical film packages 10, 10' and 10" of the present invention. The exposed adhesive surface (A) of the sheet-like optical film package 10" contacts the low-adherent surface (B) of the sheet-like optical film package 10' and can be easily separated. Therefore, the sheet-like optical film packages 10, 10' and 10" of the stack 20 are not substantially fixed to each other and the handling is easy. Base Protective Film:
In the base protective film of the sheet-like optical filter package of the present invention, one surface is a pressure-sensitive adhesive surface and by virtue of its adhesive force, a plurality of optical films can be carried on one film, facilitating the transportation. Also, at the stacking of sheet-like optical film packages, the adhesive surface exposed between respective optical film contacts the back surface of the base protective film, but the back surface of the base protective film is a low-adherent surface and therefore, packages are virtually not fixed to each other.
The base protective film is usually obtained by coating a pressure-sensitive adhesive layer on one surface of a plastic substrate and subjecting the opposite surface of the substrate to a release treatment. The plastic substrate may be, for example, a polyolefin such as polypropylene and polyethylene, a polyester, an acrylic or silicone resin. The substrate is not limited to a plastic and may be a glass. The pressure-sensitive adhesive is not particularly limited as long as it has an adhesive force high enough to hold the optical film and is substantially low-adherent for the base protective film surface subjected to a release treatment, and a pressure-sensitive adhesive such as acryl-based pressure-sensitive adhesive, rubber-based pressure-sensitive adhesive and silicone-based pressure-sensitive adhesive may be used. The adhesive force of the adhesive surface of the base protective film to the optical film is, for example, when separated at a peeling speed of 2.3 m/min (90 inch/min) in the 180° peel measurement, 40 milli-Newton/25 millimeter-width (mN/25 mm-width) or more. On the other hand, the adhesive force of the adhesive surface of the base protective film to the surface subjected to a release
treatment (back surface) is, for example, when separated at a peeling speed of 2.3 m/min (90 inch/min) in the 180° peel measurement, 100 milli-Newton/25 millimeter- width (mN/25 mm-width) or less.
The release treatment of the base protective film may be performed, for example, by either a method of imparting a physical structure to lower the adhesion area with the adhesive surface or a method of forming a low-adherent surface by applying a chemical treatment. Examples of the method of imparting a physical structure include a method of imparting a non- flattening surface by a matte treatment, an embossing treatment or a bead coating treatment. Examples of the method for the chemical treatment include a method of coating a release agent such as silicone-based release agent, fluorine-based release agent and long-chain alkyl-containing polymer release agent.
The release treatment of the base protective film may be applied to the entire low- adherent surface (B) of the base protective film or may be applied partially. In the case of partially applying the release treatment, the portion (C) in contact with the second protective film of the sheet-like optical film package 10" on the lower side can be made to be not subjected to the release treatment. The portion (C) not subjected to the release treatment ensures high light transmittance of the base protective film and the defect inspection of the optical film can be performed with good precision in the state of the optical film being laminated to the base protective film. Optical Film:
The optical films packaged in the package of the present invention are disposed so as to be spaced from each other on the base protective film. The optical film may be, for example, a light-diffusing film, a brightness-enhancing film, an antireflection plate or a lens film. The optical film is usually formed of a polyester film such as polyethylene terephthalate (PET), or a transparent plastic film such as an acryl-based film, a polycarbonate film. The optical film has, for example, on the front surface of the film, a non-flat surface such as prism, bead coating, matted surface and structure surface formed by kneading a matte into a skin layer. The back surface of the optical film may be a flat surface but is subjected to a matte treatment for preventing optical interference unevenness or treated with a fluorine-based release agent such as polytetrafluoroethylene (PTFE). Although not limited, in general, the back surface of the optical film is disposed on the self-adhesive surface of the base protective film and the front surface of the optical film is
covered with the second protective film. The above-described non-flat back surface tends to decrease in the adhesive force to the adhesive surface and therefore, a pressure-sensitive adhesive having strong adhesive property must be selected as the pressure-sensitive adhesive used for the adhesive surface of the base protective film. Second Protective Film
The second protective film covers the optical film to protect the optical film on the side opposite the base protective film carrying the optical film. The second protective film has a function of preventing the optical film from being scratched by the non-flat surface such as matted back surface of the base protective film or being contaminated by a release agent coated on the back surface of the base protective film. Although not limited, the second protective film usually protects the front surface of the optical film. The second protective film must have a shape corresponding to the shape of the non-flat surface such as prism and bead coating on the front surface of the optical film so as to tightly contact the non-flat surface and must also have a sufficiently high adhesive force to the non-flat surface. The second protective film may be the same protective film as the base protective film, such as plastic substrate having provided thereon a pressure-sensitive adhesive layer, but the back surface need not be made low-adherent. Also, the base protective film adheres over a plurality of optical films, but the individual second protective film adheres to each optical film. Incidentally, the second protective film has at least the same size as the size of the optical film so as to protect the optical film or may cover the optical film with a slight margin. Production of Sheet-Like Optical Film Package
The sheet-like optical film package of the present invention can be produced, for example, as follows. In one method, first, an optical film material containing a plurality of optical film elements is prepared, and a protective film material containing second protective films corresponding to the plurality of optical films is covered thereon. Next, the above- described base protective film is prepared and a laminate of the optical film material and the second protective film material is disposed on the adhesive surface of the base protective film. The thus-obtained laminate is cut by the half cut such that the optical film material and the second protective film material are divided into a plurality of optical films and a plurality of second optical films, while taking care not to cut the base protective
film, whereby the sheet-like optical film package of the present invention can be obtained.
In another method, an optical film material containing a plurality of optical film elements is prepared and a protective film material containing second protective films corresponding to the plurality optical films is covered thereon. This laminate is cut into individual laminates of optical film and second optical film, and these individual laminates cut are disposed on the adhesive surface of the above-described base protective film, whereby the sheet-like optical package of the present invention can be obtained.
Examples The present invention is described below based on Examples, but it should be understood that the present invention is not limited to these specific Examples. Example 1 :
A base protective film of 400x250 cm was formed by coating an acryl-based pressure-sensitive adhesive (PSA) layer to a thickness of 3 μm on the front surface of a 75 μm-thick polyethylene terephthalate (PET) film with the back surface being subjected to a matte treatment. On the pressure-sensitive adhesive layer of this base protective film, Optical Film TBEF2-M-65i(90/24) produced by Sumitomo 3 M Limited, having a size of 350x200 cm and a thickness of 65 μm (shape), was disposed as the optical film. Measurement of Holding Power: The adhesive force by which the base protective film can hold the optical film was measured according to JIS-Z0237. The optical film disposed as above was press-bonded to the base protective film under a pressure of 0.37 to 0.39 MPa and left standing still in the atmosphere of JIS-K7100 for 24 hours or more after the press-bonding. Thereafter, the films were separated at a peel angle of 180° and a peeling speed of 2.3 m/min (90 inch/min) and the peel force was measured over 5 seconds. The value stabilized during this measurement over 5 seconds was defined as the "optical film holding power".
Also, the adhesive force by which the front surface (adhesive surface) of the base protective film adheres to the back surface (low-adherent surface) of the base protective film was measured according to JIS-Z0237. Two sheets of the base protective film were prepared, stacked such that the front surface of one base protective film adheres to the back surface of another base protective film, and press-bonded under a pressure of 0.37 to 0.39 MPa. The laminate was left standing still in the atmosphere of JIS-K7100 for 24
hours or more after the press-bonding. Thereafter, the films were separated at a peel angle of 180° and a peeling speed of 2.3 m/min (90 inch/min) and the peel force was measured over 5 seconds. The value stabilized during this measurement over 5 seconds was defined as the "base protective film fixing force". Evaluation of Handleability:
A laminate of base protective film and optical film stacked as above was prepared and a second protective film was further laminated on the optical film surface. As for the second protective film, L-7325P, trade name, produced by Hitachi Chemical Co., Ltd. was used. Half cutting was performed using a pinnacle die from the second protective film side such that the second protective film and the optical film each was completely cut and the base protective film was not cut. By removing the cut portions of the second protective film and the optical film, a sheet-like optical film package (total area of laminate sheets/area of package (namely, area of base protective film)xlOO=58%) where 5x3 laminate sheets, 15 laminate sheets in total, each consisting of a second protective film and an optical film and having a size of 38 mm x 48 mm were arrayed at intervals of 3 mm, was obtained.
Whether the obtained package has a holding ability high enough to hold the laminate sheets was confirmed. As for the holding ability, the sheet-like optical film package was passed once through a nip roller at a nip pressure of 0.38 MPa and when the package was placed upright and the laminate sheet did not drop off, the package was judged to have a sufficiently high holding ability. Also, whether packages stacked by arranging the front surface of one package sheet to face the back surface of another package sheet are fixed to each other was confirmed. The fixing was confirmed by stacking 10 package sheets one on another and checking whether two package sheets out of these can be displaced from each other with a finger.
The results of optical film holding power, base protective film fixing force, laminate sheet holding ability and presence or absence of mutual fixing of packages, measured as above, are shown in Table 1 below. Example 2: The same operation as in Example 1 was performed except for changing the thickness of the acryl-based pressure-sensitive adhesive to 5 μm. The results are shown in Table 1 below.
Example 3 :
The same operation as in Example 1 was performed except for changing the thickness of the acryl-based pressure-sensitive adhesive to 10 μm. The results are shown in Table 1 below. Comparative Example A:
The same operation as in Example 1 was performed except that LDl 120-75 produced by Hitachi Chemical Co., Ltd. was used as the base protective film. This film is a film in which a pressure-sensitive adhesive having strong adhesive force is coated on a
75 μm-thick polypropylene substrate and the back surface is not subjected to a release treatment such as matte treatment, and does not have a low-adherent surface. The results are shown in Table 1 below.
Comparative Example B:
The same operation as in Example 1 was performed except that LD 1010-75 produced by Hitachi Chemical Co., Ltd. was used as the base protective film. This film is a film in which a pressure-sensitive adhesive having adhesive force weaker than that of
LD-1120-75 produced by Hitachi Chemical Co., Ltd. is coated on a 75 μm-thick polypropylene substrate and the back surface is not subjected to a release treatment such as matte treatment, and does not have a low-adherent surface. The results are shown in
Table 1 below. Table 1
It is seen from the results above that packages are fixed to each other in
Comparative Example A and the optical film cannot be held in Comparative Example B, whereas the packages of Examples 1 to 3 hold the laminate sheet and cause no fixing of upper and lower packages to each other when the packages are stacked.
Claims
1. A sheet- like optical film package comprising a base protective film, a plurality of optical films disposed on said base protective film, and a second protective film on each of said optical films, wherein one surface of said base protective film is a pressure-sensitive adhesive surface, said plurality of optical films are disposed so as to be spaced from each other on said adhesive surface, and at least a part of the adhesive surface is thereby exposed, and wherein another surface of said base protective film is a low-adherent surface.
2. The sheet-like optical film package as claimed in claim 1, wherein said base protective film comprises a plastic film having on one surface thereof a pressure-sensitive adhesive layer, with the opposite surface thereof subjected to a release treatment.
3. The sheet-like optical film package as claimed in claim 2, wherein said release treatment is a non-flattening surface-imparting treatment selected from the group consisting of a matte treatment, an embossing treatment and a bead coating treatment.
4. The sheet-like optical film package as claimed in claim 2, wherein said release treatment is coating of a release agent selected from the group consisting of a silicone- based release agent, a fluorine-based release agent and a long-chain alkyl-containing polymer release agent.
5. The sheet-like optical film package as claimed in any one of claims 1 to 4, wherein the back surface of each of said optical films contacts said base protective film and the front surface of each of said optical films contacts said second protective film.
6. A stack obtained by stacking on one another a plurality of the sheet-like optical film packages claimed in any one of claims 1 to 5, wherein the low-adherent surface of the base protective film in one sheet-like optical film package contacts the second protective film in the next sheet-like optical film package.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007102609A JP2008260540A (en) | 2007-04-10 | 2007-04-10 | Sheetlike optical film package |
| JP2007-102609 | 2007-04-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2008124223A1 true WO2008124223A1 (en) | 2008-10-16 |
Family
ID=39831307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US2008/055605 Ceased WO2008124223A1 (en) | 2007-04-10 | 2008-03-03 | Sheet-like optical film package |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2008260540A (en) |
| TW (1) | TW200906683A (en) |
| WO (1) | WO2008124223A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111108416A (en) * | 2017-09-12 | 2020-05-05 | 赢科股份有限公司 | Packaging of thermally bent polarizers and injection polarized lenses |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014196109A (en) * | 2011-07-26 | 2014-10-16 | コニカミノルタ株式会社 | Packing method of optical element and packing object |
| JP6291870B2 (en) * | 2014-01-30 | 2018-03-14 | 大同特殊鋼株式会社 | Solar power module stack |
| CN104765082B (en) * | 2015-04-27 | 2017-07-25 | 苏州佳值电子工业有限公司 | A kind of camera diffusion sheet |
| JP6328588B2 (en) | 2015-05-29 | 2018-05-23 | 株式会社シマノ | Internal transmission |
| JP7280661B2 (en) * | 2017-12-28 | 2023-05-24 | 日東電工株式会社 | Dicing die bond film |
| JP7668643B2 (en) * | 2021-02-09 | 2025-04-25 | 日東電工株式会社 | Adhesive tape for optical components |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1044291A (en) * | 1996-08-01 | 1998-02-17 | Nitto Denko Corp | Optical film and liquid crystal display |
| JPH10186129A (en) * | 1996-12-19 | 1998-07-14 | Nitto Denko Corp | Optical components |
| JP2002018997A (en) * | 2000-07-11 | 2002-01-22 | Nitto Denko Corp | Protective film for protecting the surface of optical members |
| JP2005338150A (en) * | 2004-05-24 | 2005-12-08 | Nitto Denko Corp | Optical film with surface protective film and image display device |
-
2007
- 2007-04-10 JP JP2007102609A patent/JP2008260540A/en active Pending
-
2008
- 2008-03-03 WO PCT/US2008/055605 patent/WO2008124223A1/en not_active Ceased
- 2008-03-18 TW TW097109486A patent/TW200906683A/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1044291A (en) * | 1996-08-01 | 1998-02-17 | Nitto Denko Corp | Optical film and liquid crystal display |
| JPH10186129A (en) * | 1996-12-19 | 1998-07-14 | Nitto Denko Corp | Optical components |
| JP2002018997A (en) * | 2000-07-11 | 2002-01-22 | Nitto Denko Corp | Protective film for protecting the surface of optical members |
| JP2005338150A (en) * | 2004-05-24 | 2005-12-08 | Nitto Denko Corp | Optical film with surface protective film and image display device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111108416A (en) * | 2017-09-12 | 2020-05-05 | 赢科股份有限公司 | Packaging of thermally bent polarizers and injection polarized lenses |
| US11760875B2 (en) | 2017-09-12 | 2023-09-19 | Wintec, Inc. | Package of heat-bent polarizing sheet and injection-molded polarizing lens |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008260540A (en) | 2008-10-30 |
| TW200906683A (en) | 2009-02-16 |
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