WO2016140182A1 - Procédé de fabrication de film polarisant comprenant un film protecteur - Google Patents

Procédé de fabrication de film polarisant comprenant un film protecteur Download PDF

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Publication number
WO2016140182A1
WO2016140182A1 PCT/JP2016/056029 JP2016056029W WO2016140182A1 WO 2016140182 A1 WO2016140182 A1 WO 2016140182A1 JP 2016056029 W JP2016056029 W JP 2016056029W WO 2016140182 A1 WO2016140182 A1 WO 2016140182A1
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Prior art keywords
protective film
film
polarizing film
polarizing
adhesive
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Application number
PCT/JP2016/056029
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English (en)
Japanese (ja)
Inventor
泰礼 加藤
清水　英満
Original Assignee
住友化学株式会社
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Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to CN201680013115.1A priority Critical patent/CN107407761B/zh
Priority to KR1020177023676A priority patent/KR20170124544A/ko
Priority to JP2017503465A priority patent/JPWO2016140182A1/ja
Publication of WO2016140182A1 publication Critical patent/WO2016140182A1/fr

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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
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0008—Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B2037/1253—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives curable adhesive
    • 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
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering

Definitions

  • the present invention relates to a method for producing a polarizing film with a protective film in which a protective film is laminated on one side or both sides of a polarizing film.
  • polarizing films polyvinyl alcohol resin films with dichroic dyes adsorbed and oriented are widely used. Iodine polarizing films using iodine as a dichroic dye and dichroic direct dyes in two colors There are known dye-based polarizing films and the like that are functional pigments. These polarizing films are usually used as a polarizing film with a protective film in which a protective film is bonded to one or both sides via an adhesive.
  • FIG. 2 of Japanese Patent Application Laid-Open No. 2008-0665160 is a state in which the protective film is pasted on both sides of the polarizing film (polarizer). A method of sandwiching and laminating between rolls is disclosed.
  • FIG. 1 of Japanese Patent Application Laid-Open No. 2014-056040 shows that a protective film is horizontally applied to both surfaces of the polarizing film while the polarizing film is conveyed downward in the vertical direction.
  • Patent Document 2 shows that a protective film is horizontally applied to both surfaces of the polarizing film while the polarizing film is conveyed downward in the vertical direction.
  • a method of supplying, overlapping and sandwiching between bonding rolls is disclosed. In the method described in the document, the angle formed between the polarizing film and the protective film sandwiched between the rolls is 90 degrees.
  • FIG. 1 of JP 2010-117721 A also discloses a method in which a protective film is superimposed on both sides of a polarizing film, supplied between bonding rolls, and sandwiched.
  • FIG. 1 of the same document depicts a state in which the polarizing film and the protective film are sandwiched between the bonding rolls at an angle exceeding 120 degrees.
  • the present invention has been made to solve the above-described problems, and the object of the present invention is to entrap air bubbles between the polarizing film and the protective film while ensuring the freedom of the layout of the production line.
  • the present invention is a method for producing a polarizing film with a single-sided protective film in which a first protective film is laminated on one side of the polarizing film, and the first protective film is superimposed on one side of the polarizing film via an adhesive
  • the angle between the polarizing film sandwiched between the rolls and the first protective film is 45 degrees or more on a plane perpendicular to the axial direction of the rolls.
  • the second protective film is laminated on the surface opposite to the side on which the first protective film is laminated in the polarizing film with the single-side protective film in which the first protective film is laminated on one side of the polarizing film.
  • the formed angle is 45 degrees or more.
  • the said polarizing film with a single-sided protective film used in the manufacturing method of the polarizing film with a double-sided protective film of this invention can be obtained with the manufacturing method of the polarizing film with a single-sided protective film of this invention mentioned above.
  • the manufacturing method of the polarizing film with a single-sided protective film of the present invention described above is an active energy ray curable adhesive having a viscosity of 10 mPa ⁇ s or more, particularly when the adhesive is an active energy ray curable adhesive. It is preferably applied in some cases.
  • the active energy ray-curable adhesive is irradiated by irradiating the active energy ray after being sandwiched between a pair of rolls in a state where the first protective film is superposed on one surface of the polarizing film via the active energy ray-curable adhesive.
  • the agent can be cured.
  • the above-described method for producing a polarizing film with a double-sided protective film of the present invention preferably has an active energy ray having a viscosity of 10 mPa ⁇ s or more when the adhesive is an active energy ray-curable adhesive. It is preferably applied when it is a curable adhesive. Also at this time, the active energy ray-curable adhesive is attached to the surface opposite to the side on which the first protective film is laminated in the polarizing film with the single-side protective film in which the first protective film is laminated on one side of the polarizing film.
  • the active energy ray-curable adhesive can be cured by irradiating active energy rays after being sandwiched between a pair of rolls in a state where the second protective film is overlapped via the agent.
  • one polarizing film or one polarizing film with a protective film and one protective film are pasted. Since the angle formed between the polarizing film or the polarizing film with the single-sided protective film and the protective film can be made relatively large, the polarizing film and the first protective film at the time of bonding are formed.
  • the angle and the angle formed by the polarizing film with a single-sided protective film and the second protective film are easy to adjust, and while maintaining the degree of freedom of the layout of the production line, it prevents the entrapment of bubbles during bonding While the thickness of the adhesive layer can be reduced (thinning the adhesive layer), the polarizing film with a single-sided protective film having a smaller overall thickness, A surface protective film with the polarizing film can be preferably produced.
  • FIG. 1 is a diagram schematically showing a preferred example of a method for producing a polarizing film with a double-sided protective film of the present invention.
  • this invention provides about the manufacturing method of the polarizing film with a single-sided protective film, Preferably, as the example shown in FIG. 1, as the first half part (1st bonding process) of the manufacturing method of a polarizing film with a double-sided protective film. Used.
  • the manufacturing method of this polarizing film with a single-sided protective film may be used independently.
  • the manufacturing method of the polarizing film with a single-sided protective film of this invention is a pair of rolls 4 and 5 in the state which piled up the 1st protective film 2 through the adhesive on the single side
  • An angle ⁇ formed between the polarizing film 1 and the first protective film 2 on a plane perpendicular to the axial direction is 45 degrees or more.
  • the thickness of the adhesive layer can be reduced (thinning of the adhesive layer) while suppressing the entrapment of air bubbles, whereby a polarizing film with a single-sided protective film having a smaller overall thickness can be suitably produced. it can.
  • the degree of freedom of the layout of the production line can be ensured, and unlike the case where one polarizing film and two protective films are bonded at the same time, two adhesives sandwiching the polarizing film Since it is not necessary to consider the balance of the thickness of the agent layer, there is an advantage that the condition adjustment is easy.
  • the polarizing film 3 with a single-sided protective film is usually drawn out from between the roll 4 and the roll 5 in a direction B perpendicular to the plane A including the axis of both the rolls 4 and 5, or this It is drawn in a direction within 5 degrees with respect to direction B.
  • a phenomenon called tunneling occurs in which a gap is formed between the polarizing film 1 and the first protective film 2, for example, a large bubble of 10 mm or more. Or a non-attached portion in a streak shape or wrinkles may occur.
  • the angle ⁇ formed between the polarizing film 1 and the first protective film 2 on a plane perpendicular to the axial direction of the rolls 4 and 5 when sandwiched between the rolls 4 and 5 is 45 degrees or more, preferably 60 degrees. That's it.
  • the angle ⁇ is less than 45 degrees, air is entrained between the adhesive and the polarizing film 1 or between the adhesive and the first protective film 2 to create bubbles of about 10 ⁇ m to 50 ⁇ m. May occur.
  • the upper limit of the angle ⁇ formed between the polarizing film 1 and the first protective film 2 on a plane perpendicular to the axial direction of the rolls 4 and 5 when sandwiched between the rolls 4 and 5 is usually 180 degrees or less. Preferably, it is 90 degrees or less. This is because if the angle ⁇ exceeds 180 degrees, a problem occurs in the layout of the production line, and the polarizing film 1 is likely to be wrinkled.
  • the polarizing film 1 and the first protective film 2 are formed in a direction B perpendicular to the plane A including the axis between the rolls 4 and 5, respectively.
  • angles ⁇ 1 and ⁇ 2 is preferably 90 degrees or less, more preferably less than 90 degrees, and particularly preferably 80 degrees or less from the viewpoint of the degree of freedom in layout. Furthermore, it is more preferable that the angles ⁇ 1 and ⁇ 2 are both 90 degrees or less, further less than 90 degrees, and particularly 80 degrees or less.
  • the angles ⁇ 1 and ⁇ 2 may be 0 degrees, but may exceed 0 degrees, may be 5 degrees or more, and may be 15 degrees or more.
  • the angle ⁇ is symmetrical between the polarizing film 1 and the first protective film 2 in the vertical direction around a plane parallel to the axial direction between the rolls 4 and 5. It may be arranged.
  • the angle ⁇ is 60 degrees
  • the angle ⁇ 1 formed by the polarizing film 1 and the direction B is 30 degrees
  • the angle formed by the direction B and the first protective film 2 is set.
  • ⁇ 2 is 30 degrees.
  • the polarizing film 1 and the 1st protective film 2 may be arrange
  • the angle ⁇ is 60 degrees
  • the angle ⁇ 1 formed by the polarizing film 1 and the direction B is 15 degrees
  • ⁇ 2 is 45 degrees.
  • the angle ⁇ is 60 degrees
  • the angle ⁇ 1 formed by the polarizing film 1 and the direction B is 45 degrees
  • the angle ⁇ formed by the direction B and the first protective film 2 is set. 2 is 15 degrees.
  • the polarizing film 1 is disposed above and the protective film 2 is disposed below.
  • the protective film may be disposed above and the polarizing film may be disposed below.
  • a strip-shaped polarizing film is usually used as the polarizing film 1, and the strip-shaped polarizing film is usually unwound from a polarizing film original roll (not shown) wound in a roll shape. Supplied.
  • a strip-shaped protective film is usually used as the first protective film 2 and is usually supplied while being unwound from a protective film roll (not shown) in which the strip-shaped protective film is wound into a roll. Is done.
  • the obtained polarizing film with a single-sided protective film is usually strip-shaped.
  • the polarizing film 1 and the first protective film 2 are superposed via an adhesive.
  • the adhesive may be applied only to the polarizing film 1 by a coating machine (not shown), may be applied only to the first protective film 2, or may be applied to both the polarizing film 1 and the first protective film 2. May be.
  • an adhesive agent by gravure coating in order to suppress the fracture
  • the width of the polarizing film 1 and the first protective film 2 to be used and the obtained polarizing film with a single-sided protective film are usually 500 mm or more and 3000 mm or less. Since the layout constraint becomes severe, the method of the present invention is preferably applied when the width is 1000 mm or more.
  • the present invention also provides a method for producing a polarizing film with a double-sided protective film.
  • FIG. 1 the case where the manufacturing method of this polarizing film with a double-sided protective film is performed continuously as a latter half part (2nd bonding process) following the first half part (1st bonding process) mentioned above is shown. ing.
  • the manufacturing method of the polarizing film with a double-sided protective film of this invention is the side by which the 1st protective film 2 in the polarizing film 3 with the single-sided protective film laminated
  • one polarizing film with a single-sided protective film and one second protective film are bonded.
  • the thickness of the adhesive layer can be reduced while suppressing the biting of the film, whereby a polarizing film with a double-sided protective film with a smaller overall thickness can be suitably produced.
  • the angle ⁇ formed by the polarizing film 3 with one-side protective film and the second protective film 8 on a plane perpendicular to the axial direction of the rolls 10 and 11 when sandwiched between the rolls 10 and 11 is 45 degrees or more, Preferably it is 60 degrees or more.
  • the angle ⁇ is less than 45 degrees, the air bites between the polarizing film 1 constituting the polarizing film 3 with a single-side protective film and the adhesive, or between the adhesive and the second protective film 8. In some cases, bubbles of about 10 ⁇ m to 50 ⁇ m may be generated.
  • the upper limit of the angle ⁇ formed by the polarizing film 3 with a single-sided protective film and the second protective film 8 on a plane perpendicular to the axial direction of the rolls 10 and 11 when sandwiched between the rolls 10 and 11 is Usually it is 180 degrees or less, preferably 90 degrees or less. This is because if the angle ⁇ exceeds 180 degrees, a problem may occur in the layout of the production line.
  • the polarizing film 3 with the single-side protective film and the second protective film 8 are each formed at an angle ⁇ with respect to the direction D perpendicular to the plane C including the axis of the rolls 10 and 11.
  • any of the beta 8 is 90 degrees or less, even less than 90 degrees, in particular it is preferred in terms of flexibility of layout is 80 degrees or less. Furthermore, it is more preferable that the angles ⁇ 3 and ⁇ 8 are both 90 degrees or less.
  • the angles ⁇ 3 and ⁇ 8 may be 0 degrees, but may exceed 0 degrees, may be 5 degrees or more, and may be 15 degrees or more.
  • the angle ⁇ is centered on a plane parallel to the axial direction between the rolls 10 and 11, and the polarizing film 3 with the one-side protective film and the second protective film 8 in the vertical direction. May be arranged symmetrically.
  • the angle ⁇ is 60 degrees
  • the angle ⁇ 3 formed by the polarizing film 3 with one-side protective film and the direction D is 30 degrees
  • the angle ⁇ 8 formed by is 30 degrees.
  • the polarizing film 3 with a single-sided protective film and the 2nd protective film 8 may be arrange
  • the angle ⁇ is 60 degrees
  • the angle ⁇ 8 formed by the second protective film 8 and the direction D is 15 degrees
  • the polarizing film 3 with the direction D and the single-side protective film is formed.
  • angle beta 3 forming the bets is 45 degrees.
  • the angle ⁇ is 60 degrees
  • the angle ⁇ 8 formed by the second protective film 8 and the direction D is 45 degrees
  • the direction D and the polarizing film 3 with a single-side protective film are angle ⁇ 3 formed by the is 15 degrees.
  • the polarizing film 3 with a single-sided protective film is usually strip-shaped.
  • a belt-shaped protective film is usually used as the second protective film 8
  • the belt-shaped protective film is usually supplied while being unwound from a protective film original roll (not shown) wound in a roll shape.
  • the obtained polarizing film 9 with a double-sided protective film is usually strip-shaped.
  • the polarizing film 3 with a single-side protective film and the second protective film 8 are superposed via an adhesive.
  • the adhesive may be applied only to the polarizing film 3 with a single-sided protective film by an applicator (not shown), or may be applied only to the second protective film 8, or the polarizing film 3 with a single-sided protective film and the first film. It may be applied to both of the two protective films 8.
  • an adhesive by gravure coating in order to suppress the fracture
  • An agent may be applied.
  • the width of the polarizing film 3 with a single-sided protective film and the second protective film 8 to be used and the polarizing film 9 with a double-sided protective film to be obtained are usually 500 mm or more and 3000 mm or less. Since layout restrictions become severe, the method of the present invention is preferably used when the width is 1000 mm or more.
  • the polarizing film 3 with a single-sided protective film is shown above, and below Of course, the second protective film 8 may be arranged.
  • a pair of bonding rolls 4 and 5 are arranged in the vertical direction, the polarizing film 1 and the first protective film 2 are supplied from the left side, and the polarizing film 3 with a single-side protective film is provided. Although it is pulled out toward the right side in the horizontal direction, a pair of bonding rolls 4 and 5 are arranged in a horizontal direction, and the polarizing film 1 and the first protective film 2 are supplied from above the both bonding rolls 4 and 5.
  • the polarizing film 3 with a single-side protective film may be drawn out downward in the vertical direction.
  • a pair of bonding rolls 10 and 11 are arranged in the vertical direction, the polarizing film 3 with a single-sided protective film and the second protective film 8 are supplied from the left side, and the polarized light with a double-sided protective film
  • the film 9 is pulled out in the horizontal direction toward the right side
  • the pair of bonding rolls 10 and 11 are arranged in the horizontal direction, and the polarizing film 3 with the single-sided protective film and the second protective film 8 are both bonded rolls.
  • 10 and 11 may be supplied from above, and the polarizing film 9 with double-sided protective film may be pulled out downward in the vertical direction.
  • the polarizing film 3 with a single-sided protective film and the polarizing film 9 with a double-sided protective film Is easily held in a straight line.
  • an adhesive having a relatively low viscosity is used as an adhesive, which will be described later, the polarizing film 1 and the first protective film 2 are supplied to the bonding rolls 4 and 5 from the upper side.
  • the adhesive is between the polarizing film 1 and the first protective film 2 between the rolls. It becomes easy to spread evenly between the polarizing film 3 with a single-sided protective film and the second protective film 8, and it becomes easy to form an adhesive layer having a uniform thickness.
  • the manufacturing method of the polarizing film with a double-sided protective film of this invention is continuous as a 2nd bonding process which uses the manufacturing method of the polarizing film with a single-sided protective film of this invention as a 1st bonding process like the example shown in FIG.
  • a polarizing film with a single-sided protective film has already been produced and a second protective film is bonded to this, it is needless to say that only this step may be performed.
  • the adhesive used in the present invention is not particularly limited as long as it is a liquid adhesive, and may be a water-based adhesive (such as an aqueous polyvinyl alcohol solution) commonly used in this field, or an active energy ray-curable adhesive. There may be. After the polarizing film 1 and the first protective film 2 are sandwiched between the pair of bonding rolls 4 and 5, or the polarizing film 3 with a single-side protective film and the second protective film 8 are paired with the bonding roll 10 , 11 and then drying the adhesive in the case of an aqueous adhesive, and curing the adhesive by irradiating active energy rays in the case of an active energy ray-curable adhesive. be able to.
  • a water-based adhesive such as an aqueous polyvinyl alcohol solution
  • the active energy ray-curable adhesive has a high viscosity, and is bonded between the polarizing film 1 and the adhesive, between the first protective film 2 and the adhesive, or the second protective film 8 at the time of bonding. Since it is easy to bite air bubbles between the adhesive and the adhesive, by applying the method of the present invention, a polarizing film with a single-sided protective film and a polarizing film with a double-sided protective film that are bonded while suppressing the biting of the air bubbles are manufactured. There is an advantage that you can.
  • an adhesive should just be apply
  • the adhesive may be applied to either or both of the polarizing film with a single-sided protective film and the second protective film.
  • the active energy curable adhesive suitably used in the present invention, an epoxy resin composition containing an epoxy resin that is cured by irradiation with active energy rays from the viewpoint of weather resistance, refractive index, cationic polymerizability, and the like.
  • the adhesive which consists of a thing is mentioned.
  • the present invention is not limited to this, and various active energy ray-curable adhesives (organic solvent adhesives, hot melt adhesives, solventless adhesives) that have been conventionally used in the production of polarizing plates. Etc.) can be adopted.
  • An epoxy resin means a compound having two or more epoxy groups in a molecule.
  • the epoxy resin contained in the curable epoxy resin composition that is an adhesive is an epoxy resin that does not contain an aromatic ring in the molecule (see, for example, Patent Document 1). It is preferable that Examples of such epoxy resins include hydrogenated epoxy resins, alicyclic epoxy resins, and aliphatic epoxy resins.
  • the hydrogenated epoxy resin is obtained by a method of glycidyl etherifying a nuclear hydrogenated polyhydroxy compound obtained by selectively subjecting a polyhydroxy compound, which is a raw material of an aromatic epoxy resin, to a nuclear hydrogenation reaction under pressure in the presence of a catalyst.
  • aromatic epoxy resins include bisphenol type epoxy resins such as bisphenol A diglycidyl ether, bisphenol F diglycidyl ether, and bisphenol S diglycidyl ether; phenol novolac epoxy resins, cresol novolac epoxy resins, and hydroxybenzaldehyde.
  • novolak-type epoxy resins such as phenol novolak epoxy resins; glycidyl ethers of tetrahydroxyphenylmethane, glycidyl ethers of tetrahydroxybenzophenone, and polyfunctional epoxy resins such as epoxidized polyvinylphenol.
  • hydrogenated epoxy resins hydrogenated bisphenol A glycidyl ether is preferred.
  • the alicyclic epoxy resin means an epoxy resin having at least one epoxy group bonded to the alicyclic ring in the molecule.
  • the “epoxy group bonded to an alicyclic ring” means a bridged oxygen atom —O— in the structure represented by the following formula. In the following formula, m is an integer of 2 to 5.
  • a compound in which a group in which one or more hydrogen atoms in (CH 2 ) m in the above formula are removed is bonded to another chemical structure can be an alicyclic epoxy resin.
  • One or more hydrogen atoms in (CH 2 ) m may be appropriately substituted with a linear alkyl group such as a methyl group or an ethyl group.
  • the alicyclic epoxy resin used preferably below is specifically illustrated, it is not limited to these compounds.
  • R 1 and R 2 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 3 and R 4 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and n represents an integer of 2 to 20).
  • R 5 and R 6 independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and p represents an integer of 2 to 20).
  • R 7 and R 8 independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and q represents an integer of 2 to 10).
  • R 9 and R 10 independently of each other represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms, and r represents an integer of 2 to 20).
  • R 11 and R 12 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 13 and R 14 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 16 and R 17 each independently represent a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms).
  • R 18 represents a hydrogen atom or a linear alkyl group having 1 to 5 carbon atoms.
  • the following alicyclic epoxy resins are commercially available or similar, and are more preferably used because they are relatively easy to obtain.
  • examples of the aliphatic epoxy resin include polyglycidyl ethers of aliphatic polyhydric alcohols or alkylene oxide adducts thereof. More specifically, 1,4-butanediol diglycidyl ether; 1,6-hexanediol diglycidyl ether; glycerin triglycidyl ether; trimethylolpropane triglycidyl ether; polyethylene glycol diglycidyl ether; propylene Diglycidyl ether of glycol; Polyether polyol obtained by adding one or more alkylene oxides (ethylene oxide or propylene oxide) to aliphatic polyhydric alcohols such as ethylene glycol, propylene glycol, and glycerin Examples thereof include glycidyl ether.
  • 1,4-butanediol diglycidyl ether 1,6-hexanediol diglycidyl ether
  • the epoxy resin which comprises the adhesive agent which consists of an epoxy-type resin composition may be used individually by 1 type, and may use 2 or more types together.
  • the epoxy equivalent of the epoxy resin used in this composition is usually in the range of 30 to 3000 g / equivalent, preferably 50 to 1500 g / equivalent. If the epoxy equivalent is less than 30 g / equivalent, the flexibility of the polarizing film 3 with a single-sided protective film and the polarizing film 9 with a double-sided protective film after curing may be reduced or the adhesive strength may be reduced. On the other hand, when it exceeds 3000 g / equivalent, compatibility with other components contained in the adhesive may be lowered.
  • cationic polymerization is preferably used as a curing reaction of the epoxy resin from the viewpoint of reactivity. Therefore, it is preferable to mix
  • the cationic polymerization initiator generates a cationic species or a Lewis acid by irradiation with active energy rays such as visible light, ultraviolet rays, X-rays, and electron beams, and initiates an epoxy group polymerization reaction.
  • a cationic polymerization initiator that generates a cationic species or a Lewis acid by irradiation of active energy rays and initiates a polymerization reaction of an epoxy group is referred to as a “photo cationic polymerization initiator”.
  • the method of curing the adhesive by irradiating with active energy rays using a cationic photopolymerization initiator enables curing at room temperature, reducing the need to consider the distortion due to heat resistance or expansion of the polarizing film, and between the films Is advantageous in that it can be bonded well.
  • the photocationic polymerization initiator acts catalytically by light, it is excellent in storage stability and workability even when mixed with an epoxy resin.
  • photocationic polymerization initiator examples include aromatic diazonium salts; onium salts such as aromatic iodonium salts and aromatic sulfonium salts; iron-allene complexes.
  • aromatic diazonium salt examples include benzenediazonium hexafluoroantimonate, benzenediazonium hexafluorophosphate, benzenediazonium hexafluoroborate, and the like.
  • aromatic iodonium salt examples include diphenyliodonium tetrakis (pentafluorophenyl) borate, diphenyliodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, di (4-nonylphenyl) iodonium hexafluorophosphate, and the like.
  • aromatic sulfonium salt examples include triphenylsulfonium hexafluorophosphate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium tetrakis (pentafluorophenyl) borate, 4,4′-bis (diphenylsulfonio) diphenyl sulfide bis ( Hexafluorophosphate), 4,4′-bis [di ( ⁇ -hydroxyethoxy) phenylsulfonio] diphenyl sulfide, bis (hexafluoroantimonate), 4,4′-bis [di ( ⁇ -hydroxyethoxy) phenylsulfonio ] Diphenyl sulfide bis (hexafluorophosphate), 7- [di (p-toluyl) sulfonio] -2-isopropylthioxanthone hexafluor
  • iron-allene complex examples include xylene-cyclopentadienyl iron (II) hexafluoroantimonate, cumene-cyclopentadienyl iron (II) hexafluorophosphate, xylene-cyclopentadienyl iron (II). -Tris (trifluoromethylsulfonyl) methanide and the like.
  • photocationic polymerization initiators can be easily obtained.
  • “Kayarad PCI-220” and “Kayarad PCI-620” Nippon Kayaku Co., Ltd. )
  • “UVI-6990” manufactured by Union Carbide
  • “Adekaoptomer SP-150” and “Adekaoptomer SP-170” manufactured by ADEKA Corporation
  • “CI-5102”, “ “CIT-1370”, “CIT-1682”, “CIP-1866S”, “CIP-2048S” and “CIP-2064S” aboveve, Nippon Soda Co., Ltd.
  • the photocationic polymerization initiator may be used alone or in combination of two or more.
  • aromatic sulfonium salts are preferably used because they have ultraviolet absorption characteristics even in a wavelength region of 300 nm or more, and thus can provide a cured product having excellent curability and good mechanical strength and adhesive strength.
  • the amount of the cationic photopolymerization initiator is usually 0.5 to 20 parts by weight, preferably 1 part by weight or more, and preferably 15 parts by weight or less based on 100 parts by weight of the epoxy resin.
  • the blending amount of the cationic photopolymerization initiator is less than 0.5 parts by weight with respect to 100 parts by weight of the epoxy resin, curing becomes insufficient, and mechanical strength and adhesive strength tend to decrease.
  • the compounding quantity of a photocationic polymerization initiator exceeds 20 weight part with respect to 100 weight part of epoxy resins, the hygroscopic property of hardened
  • the curable epoxy resin composition may further contain a photosensitizer as necessary.
  • a photosensitizer By using a photosensitizer, the reactivity of cationic polymerization is improved, and the mechanical strength and adhesive strength of the cured product can be improved.
  • the photosensitizer include carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo and diazo compounds, halogen compounds, and photoreductive dyes.
  • the photosensitizer include benzoin derivatives such as benzoin methyl ether, benzoin isopropyl ether, and ⁇ , ⁇ -dimethoxy- ⁇ -phenylacetophenone; benzophenone, 2,4-dichlorobenzophenone, o Benzophenone derivatives such as methyl benzoylbenzoate, 4,4′-bis (dimethylamino) benzophenone, and 4,4′-bis (diethylamino) benzophenone; thioxanthone derivatives such as 2-chlorothioxanthone and 2-isopropylthioxanthone; 2 -Anthraquinone derivatives such as chloroanthraquinone and 2-methylanthraquinone; acridone derivatives such as N-methylacridone and N-butylacridone; and others, ⁇ , ⁇ -diethoxyacetophene
  • benzoin derivatives such as benzoin methyl
  • the epoxy resin contained in the adhesive is cured by photocationic polymerization, but may be cured by both photocationic polymerization and thermal cationic polymerization. In the latter case, it is preferable to use a photocationic polymerization initiator and a thermal cationic polymerization initiator in combination.
  • thermal cationic polymerization initiator examples include benzylsulfonium salt, thiophenium salt, thioranium salt, benzylammonium, pyridinium salt, hydrazinium salt, carboxylic acid ester, sulfonic acid ester, and amine imide.
  • thermal cationic polymerization initiators can be easily obtained as commercial products. For example, “Adeka Opton CP77” and “Adeka Opton CP66” (manufactured by ADEKA Corporation), “CI” are available under the trade names.
  • the active energy ray-curable adhesive may further contain a compound that promotes cationic polymerization, such as oxetanes and polyols.
  • Oxetanes are compounds having a 4-membered ring ether in the molecule, such as 3-ethyl-3-hydroxymethyloxetane, 1,4-bis [(3-ethyl-3-oxetanyl) methoxymethyl] benzene, 3 -Ethyl-3- (phenoxymethyl) oxetane, di [(3-ethyl-3-oxetanyl) methyl] ether, 3-ethyl-3- (2-ethylhexyloxymethyl) oxetane, phenol novolac oxetane and the like. These oxetanes can be easily obtained as commercial products.
  • polyols those having no acidic group other than phenolic hydroxyl groups are preferable.
  • polyol compounds having no functional groups other than hydroxyl groups polyester polyol compounds, polycaprolactone polyol compounds, polyol compounds having phenolic hydroxyl groups, polycarbonates A polyol etc. can be mentioned.
  • the molecular weight of these polyols is usually 48 or more, preferably 62 or more, more preferably 100 or more, and preferably 1,000 or less.
  • These polyols are usually contained in the curable epoxy resin composition in a proportion of 50% by weight or less, preferably 30% by weight or less.
  • Active energy ray-curable adhesives further include ion trapping agents, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow regulators, leveling agents, plasticizers, antifoaming agents, etc. Additives can be blended.
  • the ion trapping agent include powdered bismuth-based, antimony-based, magnesium-based, aluminum-based, calcium-based, and titanium-based inorganic compounds
  • examples of the antioxidant include hindered phenol-based antioxidants. Etc.
  • Active energy ray-curable adhesives can be used as solvent-free adhesives that are substantially free of solvent components, but each coating system has an optimum viscosity range, A solvent may be included. It is preferable to use a solvent that dissolves the epoxy resin composition and the like well without degrading the optical performance of the polarizing film.
  • a solvent that dissolves the epoxy resin composition and the like well without degrading the optical performance of the polarizing film.
  • organic solvents such as The viscosity of the active energy ray-curable adhesive used in the present invention is, for example, in the range of about 5 to 1000 mPa ⁇ s, preferably 10 to 200 mPa ⁇ s, and more preferably 20 to 100 mPa ⁇ s.
  • the thickness of the adhesive layer is not particularly limited and is usually 0.2 ⁇ m to 3 ⁇ m. However, in the present invention, the thickness of the adhesive layer is reduced to 0. It is preferably in the range of 5 ⁇ m to 1 ⁇ m, more preferably 0.8 ⁇ m or less.
  • the first protective film 2 is attached to one side of the polarizing film 1 via an active energy ray-curable adhesive.
  • the active energy ray-curable adhesive may be cured by irradiating active energy rays with a UV lamp 6 or the like.
  • the active energy ray-curable adhesive may be applied to the polarizing film 1 in advance. It is preferable to apply to the first protective film 2 in advance.
  • surface of the polarizing film 1 was laminated
  • the active energy is applied with a UV lamp 12 or the like.
  • the active energy ray-curable adhesive may be cured by irradiating a line.
  • the active energy ray-curable adhesive is applied to the polarizing film 3 with a single-sided protective film.
  • the active energy ray-curable adhesive is applied to the polarizing film 3 with a single-sided protective film.
  • it may be applied in advance, it is preferably applied in advance to the second protective film.
  • the active energy ray may be irradiated only after the second bonding step, and by irradiating in this way, facilities such as UV lamps for irradiation are arranged in one place.
  • the layout can be simplified, which is preferable from the viewpoint of layout flexibility.
  • a roll formed of a material usually used in this field such as a metal roll and a rubber roll is used without particular limitation.
  • aqueous adhesive is used for laminating the polarizing film 1 and the first protective film 2
  • one of the laminating rolls 4 and 5 is a metal roll
  • the other is a combination of rubber rolls, or a pair of rubber.
  • a roll is preferably used.
  • both rolls 4 and 5 must be metal rolls.
  • the combination of a metal roll and the other is a rubber roll is preferably used.
  • the polarizing film 1 is hard to tear, and the bonding roll (the bonding roll 4 in the example shown in FIG. 1) is in contact with the polarizing roll 1
  • the bonding roll it is preferable to use a rubber roll for the bonding roll (the bonding roll 5 in the example shown in FIG. 1) on the side where the first protective film 2 is in contact with the roll, and the angle ⁇ 1 exceeds 0 degrees. In some cases, it is more preferable.
  • the bonding rolls 10 and 11 used for a 2nd bonding process it was formed with the material normally used in this field
  • a roll is used without particular limitation.
  • a water-based adhesive is used for laminating the polarizing film 3 with a single-side protective film and the second protective film 8
  • one of the laminating rolls 10 and 11 is a combination of a metal roll and the other is a rubber roll, or A pair of rubber rolls is preferably used.
  • FIG. 1 shows an example in which a metal roll is used as the bonding roll 10 and a rubber roll is used as the bonding roll 11.
  • the base material of the metal roll various known materials can be used, preferably stainless steel, and more preferably SUS304 (stainless steel containing 18% Cr and 8% Ni).
  • the surface of the metal roll is preferably subjected to chrome plating.
  • the material of the rubber roll is not particularly limited, and examples thereof include NBR (nitrile rubber), Titan, urethane, silicon, EPDM (ethylene-propylene-diene rubber), and preferably NBR, Titan, and urethane.
  • the hardness of the rubber roll is not particularly limited, but is usually 60 to 100 °, preferably 85 to 95 °.
  • the hardness of the rubber roll can be measured with a hardness meter in accordance with JIS K 6253. As a commercially available hardness meter, for example, a rubber hardness meter “Type-A” manufactured by Asuka Corporation is used. Specifically, the resistance of the surface of the rubber roll when the surface is pressed with a stick or the like is measured with a hardness meter.
  • a diameter becomes small from a center part to an edge part (that is, the radius of a center part is larger than the radius of an edge part).
  • a crown roll having a tapered outer peripheral shape may be used.
  • a flat roll having a substantially uniform diameter may be used for both the metal roll and the rubber roll.
  • the diameter of the bonding roll is not particularly limited, but the diameter in the case of a flat roll is preferably 100 mm to 270 mm.
  • the diameter of the end portion in the case of a crown roll is preferably 100 mm to 270 mm.
  • the diameter of each of a pair of bonding roll may be the same, and may differ.
  • variety of the bonding roll should just be the width
  • the pressure of the pressure in the case of the bonding by the bonding rolls 4 and 5 and the bonding in the bonding rolls 10 and 11 is not particularly limited, a metal roll and a rubber roll are used as described above.
  • the instantaneous pressure in a two-sheet type press case (for ultra-low pressure) manufactured by Fuji Film is usually 0.5 MPa to 2.0 MPa.
  • the pressure of the press with respect to this bonding roll is normally applied to the bearing member of the both ends of a bonding roll.
  • the polarizing film 3 with a single-sided protective film is held so that the tension is constant by contacting the roll 7 before being bonded to the second protective film 8.
  • a roll 7 a roll conventionally used in this field can be used without any particular limitation.
  • the 1st protective film 2 the polarizing film 3 with a single-sided protective film, and the 2nd protective film 8
  • 10m / Min to 50 m / min.
  • polarizing film used in the present invention an appropriate polarizing film usually used in this field, preferably a strip-shaped polarizing film is used.
  • polarizing film a polarizing film obtained by adsorbing and orienting a dichroic dye on a uniaxially stretched polyvinyl alcohol resin film is preferably used.
  • the polyvinyl alcohol resin can be obtained by saponifying a polyvinyl acetate resin.
  • a polyvinyl acetate resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and other monomers copolymerizable therewith (for example, ethylene-vinyl acetate copolymer). Polymer).
  • Other monomers that can be copolymerized with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, acrylamides having an ammonium group, and the like.
  • the degree of saponification of the polyvinyl alcohol resin is 85 mol% or more, preferably 90 mol% or more, more preferably 98 to 100 mol%.
  • the average degree of polymerization of the polyvinyl alcohol-based resin is usually 1000 to 10000, preferably 1500 to 5000.
  • These polyvinyl alcohol resins may be modified. For example, polyvinyl formal modified with aldehydes, polyvinyl acetal, polyvinyl butyral, and the like may be used.
  • a film obtained by forming such a polyvinyl alcohol resin is used as an original film of a polarizing film.
  • the method for forming the polyvinyl alcohol-based resin is not particularly limited, and can be formed by a conventionally known appropriate method.
  • the film thickness of the raw film made of polyvinyl alcohol resin is not particularly limited, but is, for example, about 10 to 150 ⁇ m. Usually, it is supplied in the form of a roll, the thickness is in the range of 20 to 100 ⁇ m, preferably in the range of 30 to 80 ⁇ m, and the industrially practical width is in the range of 1500 to 6000 mm.
  • the commercially available polyvinyl alcohol film (Vinylon VF-PS # 7500, Kuraray / OPL film M-7500, Nihon Gosei) has a thickness of 75 ⁇ m (Vinylon VF-PS # 6000, Kuraray, Vinylon VF-PE #).
  • the original fabric thickness of 6000 (manufactured by Kuraray) is 60 ⁇ m.
  • the polarizing film is usually a process of dyeing a polyvinyl alcohol resin film with a dichroic dye to adsorb the dichroic dye (dyeing process), and a polyvinyl alcohol resin film adsorbed with the dichroic dye is boric acid. It is manufactured through a step of treating with an aqueous solution (boric acid treatment step) and a step of washing with water after the treatment with the boric acid aqueous solution (water washing treatment step).
  • the polyvinyl alcohol-based resin film is usually uniaxially stretched, but this uniaxial stretching may be performed before the dyeing treatment step or during the dyeing treatment step, It may be performed after the dyeing process.
  • this uniaxial stretching may be performed before the boric acid treatment step or during the boric acid treatment step.
  • the uniaxial stretching may be performed uniaxially between rolls having different peripheral speeds, or may be performed uniaxially using a hot roll. Moreover, the dry-type extending
  • the draw ratio is usually about 3 to 8 times.
  • the dyeing of the polyvinyl alcohol-based resin film with the dichroic dye in the dyeing process is performed, for example, by immersing the polyvinyl alcohol-based resin film in an aqueous solution containing the dichroic dye.
  • the dichroic dye for example, iodine, a dichroic dye or the like is used.
  • dichroic dyes include C.I. I. Dichroic direct dyes composed of disazo compounds such as DIRECT RED 39, and dichroic direct dyes composed of compounds such as trisazo and tetrakisazo are included.
  • the polyvinyl alcohol-type resin film performs the immersion process to water before a dyeing process.
  • iodine When iodine is used as the dichroic dye, a method of dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing iodine and potassium iodide is usually employed.
  • the content of iodine in this aqueous solution is usually 0.01 to 1 part by weight per 100 parts by weight of water, and the content of potassium iodide is usually 0.5 to 20 parts by weight per 100 parts by weight of water.
  • the temperature of the aqueous solution used for dyeing is usually 20 to 40 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 20 to 1800 seconds.
  • a method of immersing and dyeing a polyvinyl alcohol-based resin film in an aqueous solution containing an aqueous dichroic dye is usually employed.
  • the content of the dichroic dye in this aqueous solution usually, 1 ⁇ 10 -4 ⁇ 10 parts by weight per 100 parts by weight of water, preferably 1 ⁇ 10 -3 ⁇ 1 parts by weight, particularly preferably 1 ⁇ 10 - 3 to 1 ⁇ 10 ⁇ 2 parts by weight.
  • This aqueous solution may contain an inorganic salt such as sodium sulfate as a dyeing assistant.
  • the temperature of the dye aqueous solution used for dyeing is usually 20 to 80 ° C.
  • the immersion time (dyeing time) in this aqueous solution is usually 10 to 1800 seconds. is there.
  • the boric acid treatment step is performed by immersing a polyvinyl alcohol resin film dyed with a dichroic dye in a boric acid-containing aqueous solution.
  • the amount of boric acid in the boric acid-containing aqueous solution is usually 2 to 15 parts by weight, preferably 5 to 12 parts by weight per 100 parts by weight of water.
  • the boric acid-containing aqueous solution used in this boric acid treatment process preferably contains potassium iodide.
  • the amount of potassium iodide in the boric acid-containing aqueous solution is usually 0.1 to 15 parts by weight, preferably 5 to 12 parts by weight, per 100 parts by weight of water.
  • the immersion time in the boric acid-containing aqueous solution is usually 60 to 1200 seconds, preferably 150 to 600 seconds, and more preferably 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 40 ° C. or higher, preferably 50 to 85 ° C., more preferably 55 to 75 ° C.
  • the polyvinyl alcohol-based resin film after the boric acid treatment described above is washed with water, for example, by immersing it in water.
  • the temperature of water in the water washing treatment is usually 4 to 40 ° C., and the immersion time is usually 1 to 120 seconds.
  • a drying treatment is usually performed to obtain a polarizing film.
  • the drying process is preferably performed using, for example, a hot air dryer or a far infrared heater.
  • the temperature for the drying treatment is usually 30 to 100 ° C., preferably 50 to 80 ° C.
  • the drying treatment time is usually 60 to 600 seconds, preferably 120 to 600 seconds.
  • the polyvinyl alcohol resin film is subjected to uniaxial stretching, dyeing with a dichroic dye, boric acid treatment and water washing treatment to obtain a polarizing film.
  • the thickness of this polarizing film is usually in the range of 5 to 50 ⁇ m.
  • first protective film and the second protective film in the present invention examples include cycloolefin resins, cellulose acetate resins, polyester resins such as polyethylene terephthalate, polyethylene naphthalate, and polybutylene terephthalate, and polycarbonate resins.
  • the cycloolefin resin is a thermoplastic resin (also referred to as a thermoplastic cycloolefin resin) having a monomer unit made of a cyclic olefin (cycloolefin), such as norbornene or a polycyclic norbornene monomer.
  • the cycloolefin-based resin may be a hydrogenated product of the above-mentioned cycloolefin ring-opening polymer or a ring-opening copolymer using two or more cycloolefins, and has a cycloolefin, a chain olefin, and a vinyl group.
  • An addition polymer with an aromatic compound or the like may be used. Those having a polar group introduced are also effective.
  • examples of the chain olefin include ethylene and propylene
  • examples of the aromatic compound having a vinyl group include Examples include styrene, ⁇ -methylstyrene, and nuclear alkyl-substituted styrene.
  • the monomer unit composed of cycloolefin may be 50 mol% or less (preferably 15 to 50 mol%).
  • the amount of the monomer unit composed of cycloolefin can be made relatively small as described above.
  • the unit of monomer composed of a chain olefin is usually 5 to 80 mol%
  • the unit of monomer composed of an aromatic compound having a vinyl group is usually 5 to 80 mol%.
  • Cycloolefin-based resins may be commercially available products such as Topas (manufactured by Ticona), Arton (manufactured by JSR), ZEONOR (manufactured by Nippon Zeon), ZEONEX (manufactured by Nippon Zeon ( Co., Ltd.), Apel (manufactured by Mitsui Chemicals, Inc.), Oxis (OXIS) (manufactured by Okura Kogyo Co., Ltd.) and the like can be suitably used.
  • a known method such as a solvent casting method or a melt extrusion method is appropriately used.
  • cycloolefin resin films such as Essina (manufactured by Sekisui Chemical Co., Ltd.), SCA40 (manufactured by Sekisui Chemical Co., Ltd.), Zeonoa Film (manufactured by Optes Co., Ltd.), etc. You may use goods.
  • the cycloolefin resin film may be uniaxially stretched or biaxially stretched.
  • Stretching is usually performed continuously while unwinding the film roll, and in a heating furnace, the roll traveling direction (film longitudinal direction), the direction perpendicular to the traveling direction (film width direction), or both Stretched.
  • the temperature of the heating furnace a range from the vicinity of the glass transition temperature of the cycloolefin resin to the glass transition temperature + 100 ° C. is usually employed.
  • the stretching ratio is usually 1.1 to 6 times, preferably 1.1 to 3.5 times.
  • the cycloolefin-based resin film When the cycloolefin-based resin film is in a roll-wound state, the films tend to adhere to each other and easily cause blocking. Therefore, the cycloolefin-based resin film is usually rolled after the protective film is bonded.
  • the surface to be bonded to the polarizing film is subjected to surface treatment such as plasma treatment, corona treatment, ultraviolet irradiation treatment, flame (flame) treatment, and saponification treatment. Is preferred.
  • plasma treatment that can be carried out relatively easily, particularly atmospheric pressure plasma treatment, and corona treatment are preferable.
  • the cellulose acetate-based resin is a cellulose part or a completely esterified product, and examples thereof include a film made of cellulose acetate ester, propionate ester, butyrate ester, and mixed ester thereof. More specifically, a triacetyl cellulose film, a diacetyl cellulose film, a cellulose acetate propionate film, a cellulose acetate butyrate film, and the like can be given.
  • a cellulose ester resin film As such a cellulose ester resin film, an appropriate commercially available product, for example, Fujitac TD80 (Fuji Film Co., Ltd.), Fujitac TD80UF (Fuji Film Co., Ltd.), Fujitac TD80UZ (Fuji Film Co., Ltd.) KC8UX2M (manufactured by Konica Minolta Opto), KC8UY (manufactured by Konica Minolta Opto) Fujitac TD60UL (manufactured by Fuji Film), KC4UYW (manufactured by Konica Minolta Opto), KC6UAW (Konica Minolta Opto) Etc.) can be used preferably.
  • Fujitac TD80 Fujitac TD80UF (Fuji Film Co., Ltd.)
  • Fujitac TD80UZ Fujiji Film Co., Ltd.
  • a cellulose acetate-based resin film imparted with retardation characteristics is also preferably used.
  • Commercially available cellulose acetate resin films with such retardation characteristics include WV BZ 438 (Fuji Film Co., Ltd.), KC4FR-1 (Konica Minolta Opto Co., Ltd.), and KC4CR-1 (Konica Minolta). Opt Co., Ltd.), KC4AR-1 (Konica Minolta Opto Co., Ltd.) and the like.
  • Cellulose acetate is also called acetyl cellulose or cellulose acetate.
  • the moisture content during the production of the polarizing plate is preferably closer to the equilibrium moisture content in the storage environment of the polarizing plate, for example, a clean room production line or a roll storage warehouse, and depends on the configuration of the laminated film. About 5%, more preferably 2.5 to 3.0%.
  • the numerical value of the moisture content of this polarizing plate was measured by the dry weight method and is a change in weight after 105 ° C./120 minutes.
  • the first protective film and / or the second protective film have a function as a retardation film, a function as a brightness enhancement film, a function as a reflection film, a function as a transflective film, and a diffusion film.
  • optical functions such as a function as an optical compensation film and a function as an optical compensation film.
  • the protective film itself can be provided with such a function.
  • a protective film may have a plurality of functions such as a diffusion film having a function of a brightness enhancement film.
  • the above-described protective film is subjected to a stretching process described in Japanese Patent No. 2841377, Japanese Patent No. 3094113, or the like, or a process described in Japanese Patent No. 3168850 can be used as a retardation film.
  • the function of can be provided.
  • the retardation characteristics of the retardation film can be appropriately selected, for example, such that the front retardation value is in the range of 5 to 100 nm and the thickness direction retardation value is in the range of 40 to 300 nm.
  • two or more layers having different center wavelengths of selective reflection are formed in the protective film by forming micropores by a method as described in JP-A No. 2002-169025 and JP-A No. 2003-29030. By superimposing these cholesteric liquid crystal layers, a function as a brightness enhancement film can be imparted.
  • a function as a reflective film or a transflective film can be imparted.
  • a function as a diffusion film can be imparted.
  • the function as an optical compensation film can be provided by coating and aligning liquid crystalline compounds, such as a discotic liquid crystalline compound, on said protective film.
  • you may make the protective film contain the compound which expresses retardation.
  • various optical functional films may be directly bonded to the polarizing film using an appropriate adhesive.
  • optical functional films include brightness enhancement films such as DBEF (manufactured by 3M, available from Sumitomo 3M Co., Ltd. in Japan), and viewing angle improvements such as WV film (manufactured by Fuji Film Co., Ltd.).
  • Film, Arton Film (manufactured by JSR Corporation), Zeonoor Film (manufactured by Optes Corporation), Essina (manufactured by Sekisui Chemical Co., Ltd.), VA-TAC (manufactured by Comic Minolta Opto Corporation), Sumikalite (Sumitomo) (Chemical Co., Ltd.) etc. can be mentioned.
  • the thickness of the protective film used in the present invention is preferably thin, but if it is too thin, the strength is lowered and the processability is poor. On the other hand, when it is too thick, problems such as a decrease in transparency and a longer curing time after lamination occur. Therefore, a suitable thickness of the protective film is, for example, 5 to 200 ⁇ m, preferably 10 to 150 ⁇ m, more preferably 10 to 100 ⁇ m.
  • the polarizing film and / or protective film may be subjected to corona treatment, flame treatment, plasma treatment, ultraviolet treatment, primer coating treatment, saponification treatment, etc.
  • a surface treatment may be applied.
  • the protective film may be subjected to surface treatments such as anti-glare treatment, anti-reflection treatment, hard coat treatment, antistatic treatment, and antifouling treatment individually or in combination of two or more.
  • the protective film and / or the protective film surface protective layer may contain a UV absorber such as a benzophenone compound or a benzotriazole compound, or a plasticizer such as a phenyl phosphate compound or a phthalate compound.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

L'invention concerne : un procédé de fabrication d'un film polarisant équipé d'un film protecteur sur un côté de ce dernier, l'angle formé par un premier film protecteur et un film polarisant maintenus entre des rouleaux étant d'au moins 45 degrés dans un plan perpendiculaire à la direction axiale des rouleaux ; et un procédé de fabrication d'un film polarisant équipé de films protecteurs sur les deux côtés de ce dernier, l'angle formé par un second film protecteur et un film polarisant équipé d'un film protecteur sur un côté de ce dernier et maintenus entre des rouleaux étant d'au moins 45 degrés dans un plan perpendiculaire à la direction axiale des rouleaux.
PCT/JP2016/056029 2015-03-03 2016-02-29 Procédé de fabrication de film polarisant comprenant un film protecteur WO2016140182A1 (fr)

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JP2022044597A (ja) * 2017-03-03 2022-03-17 住友化学株式会社 光学フィルム原反ロールの製造方法、および光学部材シートの製造方法
WO2022219838A1 (fr) * 2021-04-16 2022-10-20 日東電工株式会社 Procédé de production de stratifié optique
WO2022219839A1 (fr) * 2021-04-16 2022-10-20 日東電工株式会社 Procédé de fabrication de stratifié optique

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CN107742575A (zh) * 2017-10-10 2018-02-27 深圳市信维通信股份有限公司 一种非晶或纳米晶带材叠层的制备方法及制造系统

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