JP2011095318A - Direct sticking optical film for flat panel display or optical film laminate and method of manufacturing them - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a direct sticking optical film laminate for flat panel display being thin and light in weight, having excellent shock absorbing function and re-peeling off performance, and capable of preventing quality of image to be displayed on a display unit from being degraded. <P>SOLUTION: The direct sticking optical film laminate 10 for the flat panel display is formed by an adhesive optical film laminate constituted by sticking an adhesive sheet (b) manufactured by using polyoxyalkylene polymer as a main component onto one face of a film laminate (a) constituted by sticking two functional optical films 1 or more through an adhesive layer. Degassing treatment for discharging dissolved air in the laminate is applied on the direct sticking optical film laminate. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a directly attached optical film or optical film laminate for a flat panel display that can be directly attached to a display module or the like of a flat panel display, and a manufacturing method thereof.

  Flat panel displays such as liquid crystal displays have become widespread as image display means in personal computers and televisions, and in recent years, since they are incorporated into mobile communication terminals such as electronic notebooks, portable game machines, and mobile phones, they are smaller and thinner. The process is progressing rapidly. In mobile communication terminals such as electronic notebooks, portable game machines, and cellular phones, touch panel integrated liquid crystal displays are becoming mainstream. To reduce the thickness and weight, touch panels are replaced with liquid crystal modules (liquid crystal panels). Attempts have been made to attach directly through a double-sided transparent adhesive sheet (Patent Document 1). In addition, the touch panel itself is made of a transparent conductive film based on a plastic film instead of a touch panel using a so-called conductive glass plate in which an indium oxide thin film is formed on a conventional glass in order to reduce weight and thickness. The used film touch panel has come to be used. However, although the transparent conductive film is light and thin, there are drawbacks such as insufficient scratch resistance and bending resistance. For this reason, measures for compensating for such drawbacks have also been studied, and the applicant of the present application can further laminate a transparent conductive film on the transparent conductive film via an adhesive layer, The transparent conductive laminated body which laminated | stacked the plastic film which carried out the hard coat process through the adhesive layer was proposed (patent document 2).

  On the other hand, in order to prevent malfunction of equipment due to electromagnetic waves radiated from a display module (display panel) of a flat panel display, an electromagnetic wave shielding sheet or the like has been conventionally attached to the display module (display panel). .

JP 2003-342542 A JP 2002-326301 A

  By the way, the film touch panel and the direct adhesive filter for shielding electromagnetic waves and near-infrared rays are optical films in which a plurality of functional optical films such as a transparent conductive film, a hard coat treatment film, and an electromagnetic wave shielding film are bonded via an adhesive layer. Although it is a laminated body, it is advantageous for thinning the display with integrated touch panel and filter (touch panel integrated display, display with filter, etc.), but it has poor shock absorption capability, and the front glass plate and display module of the display The protection function that protects against impact is not sufficient. Also, double-sided transparent adhesive to be applied to film touch panel and electromagnetic wave and near-infrared shielding filter so that when a mistake is made in the process of pasting a film touch panel or direct pasting filter to the display module, the pasting can be performed again. The sheet is required to have removability. Patent Document 1 proposes a double-sided transparent pressure-sensitive adhesive sheet in which a transparent pressure-sensitive adhesive layer is formed on both sides of a transparent base material that is optically isotropic or uniaxial from such a viewpoint. Since the double-sided transparent pressure-sensitive adhesive sheet having a large thickness includes the base material, thinning of the flat panel display with a touch panel and the flat panel display with a filter is limited. In addition, this type of double-sided transparent adhesive sheet needs to be soft enough to absorb the level difference of the printed layer provided on the periphery of the lens. The double-sided transparent adhesive sheet is desirable.

  The present invention has been made in view of the circumstances as described above, and the problems to be solved are thin and light, have an excellent impact absorbing function and excellent removability, and are flat panel displays. It is providing the optical film or optical film laminated body for flat panel displays, and those manufacturing methods which do not reduce the image quality of the display image of this.

  Another object of the present invention is to provide a thin and lightweight optical film or optical film laminate integrated flat panel display which is excellent in crack resistance of the front display glass and the display module and from which a display image with excellent visibility can be obtained.

  As a result of diligent research to solve the above-mentioned problems, the present inventors are one side of one functional optical film, or an optical film in which two or more functional optical films are bonded together via an adhesive layer. By sticking a pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component on one side of the laminate, the pressure-sensitive adhesive optical film is thin and lightweight, and has an excellent impact absorbing function and excellent removability, or In addition, the adhesive optical film laminate can be obtained, and the autoclaving performed to increase the adhesion between the layers when obtaining the adhesive optical film or the adhesive optical film laminate is performed by the optical film or Several hours after the optical film laminate is affixed to a display lens, front display glass or display module of a flat panel display, the optical film or It turns out that it is a cause of the unnecessary bubble generated at the interface between the optical film laminate and the display lens, the front display glass, or the display module. Based on these findings, the display lens, the front display glass, the display module, etc. The present invention has been completed by further research to obtain a directly attached optical film or optical film laminate that can prevent generation of unnecessary bubbles after being attached to the substrate.

That is, the present invention is as follows.
(1) An adhesive optical film in which an adhesive sheet mainly composed of a polyoxyalkylene polymer is attached to one side of one functional optical film, or two or more functional optical films are used as an adhesive. It consists of an adhesive optical film laminate in which an adhesive sheet mainly composed of a polyoxyalkylene polymer is attached to one side of a film laminate bonded through layers, and is subjected to a degassing treatment that releases dissolved air. A directly attached optical film or optical film laminate for a flat panel display, characterized in that
(2) The functional optical film has at least one of an electromagnetic wave shielding function, a conductive function, an antireflection function, an infrared shielding function, a polarizing function, and a hard coat property, and the flat panel according to (1) above Direct-attached optical film or optical film laminate for display.
(3) The directly attached optical film for flat panel display according to (1) or (2) above, wherein the pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component comprises a cured product of a composition containing the following components A to C: Optical film laminate.
A: Polyoxyalkylene polymer having at least one alkenyl group in one molecule B: Compound having an average of two or more hydrosilyl groups in one molecule C: Hydrosilylation catalyst (4) Functionality of two or more sheets An optical film is bonded through an adhesive layer, and an adhesive sheet containing a polyoxyalkylene polymer as a main component is bonded to the film surface opposite to the adhesive layer side of the outermost functional optical film. 1 process,
A second step of subjecting the adhesive optical film laminate obtained in the first step to autoclaving; and releasing the dissolved air in the laminate to the adhesive optical film laminate subjected to the second step. The manufacturing method of the direct-bonding optical film laminated body for flat panel displays which has a 3rd process which performs a degassing process.
(5) a first step of bonding two or more functional optical films through an adhesive layer;
A second step of subjecting the optical film laminate obtained in the first step to autoclaving,
Degassing to release dissolved air in the obtained adhesive optical film laminate after bonding an adhesive sheet mainly composed of a polyoxyalkylene polymer to one side of the optical film laminate having undergone the second step The manufacturing method of the direct-bonding optical film laminated body for flat panel displays which has a 3rd process of processing.
(6) a first step of bonding an adhesive sheet containing a polyoxyalkylene polymer as a main component to one side of one functional optical film;
A second step of subjecting the adhesive optical film obtained in the first step to autoclave treatment, and a third step of performing degassing treatment for releasing dissolved air on the adhesive optical film having undergone the second step; The manufacturing method of the direct-bonding optical film for flat panel displays which has these.
(7) The degassing treatment heats the adhesive optical film laminate for a predetermined time at a temperature equal to or higher than the glass transition temperature of the base plastic film of the functional optical film constituting the adhesive optical film or the adhesive optical film laminate. The method according to any one of (4) to (6) above, which is a treatment.
(8) Each of the functional optical films is a functional optical film having at least one of an electromagnetic wave shielding function, a conductive function, an antireflection function, an infrared shielding function, a polarization function, and a hard coat property, The method according to any one of 4) to (7).
(9) The method according to any one of (4) to (8) above, wherein the pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component comprises a cured product of a composition containing the following components A to C.
A: Polyoxyalkylene polymer having at least one alkenyl group in one molecule B: Compound having two or more hydrosilyl groups on average in one molecule C: Hydrosilylation catalyst (10) Display lens or front display glass Alternatively, the optical film or the optical film laminate integrated flat panel display, wherein the optical film or the optical film laminate according to any one of the above (1) to (3) is attached to the display module. .

  According to the present invention, it is thin and lightweight, has an excellent shock absorbing function and removability, and can be directly attached to a display module of a flat panel display, a display lens, a front display glass, etc. Directly pasted optical film for high function flat panel display, which does not generate unnecessary bubbles at the interface with the display module, display lens, front display glass, etc., and does not reduce the visibility of the display image on the display An optical film laminate can be obtained.

  Therefore, by sticking such a directly attached optical film or optical film laminate to a display module, display lens, front display glass, etc. of a flat panel display, the display image has excellent visibility (optical film or optical film laminate and display). There are no problems such as an increase in visible light reflectivity and double reflection due to interfacial reflection between them), and the desired function is imparted by the optical film or optical film laminate, which is excellent in crack resistance of the display module and front display glass. A flat panel display can be realized.

FIG. 1 is a diagram schematically showing a cross-section of an example of a directly attached optical film laminate for a flat panel display according to the present invention.

Hereinafter, the present invention will be described with reference to preferred embodiments.
FIG. 1 is a diagram schematically showing a cross section of an example of a directly attached optical film laminate for flat panel displays (hereinafter, also simply referred to as “directly attached optical film laminate”) of the present invention.

  The direct-bonding optical film laminate 10 of the example is formed on one surface of an optical film laminate a in which two functional optical films 1 (transparent conductive films 1A and 1B) are bonded via an adhesive layer 2. An adhesive sheet b containing an oxyalkylene polymer as a main component is pasted to impart adhesiveness to the optical film laminate a. The directly attached optical film laminate 10 has a sheet surface opposite to the optical film laminate a side of the pressure-sensitive adhesive sheet b having a polyoxyalkylene polymer as a main component, as a display lens or front display of the flat panel display 20. It is used by being attached to glass or display module 21.

  In addition, in the example of FIG. 1, although the direct attachment optical film laminated body 10 using the two functional optical films 1 is shown, in the direct attachment optical film laminated body of this invention, the adhesion in the optical film laminated body a The number of functional optical films 1 laminated via the agent layer 2 is not particularly limited, and the required number of functional optical films 1 for imparting a desired function may be used. Is.

  FIG. 1 shows an example in which two transparent conductive films 1A and 1B are used as the functional optical film 1, but the function of the functional optical film in the present invention is not limited, and electromagnetic wave shielding. At least one of the function, the conductive function, the antireflection function, the infrared shielding function, the polarization function, and the hard coat property may be mentioned.

  Moreover, although the example of FIG. 1 is an optical film laminate for directly attaching a flat panel display, the adhesive property is imparted to the optical film laminate obtained by laminating two functional optical films via an adhesive layer. In the present invention, a pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component is pasted on one side of one functional optical film (for example, a transparent conductive film), and a display lens or front display glass or a display module. It is also possible to constitute a direct-bonding optical film for flat panel display that is used by directly bonding to a flat panel display.

  The functional optical film 1 in the present invention is usually formed by using a transparent plastic film as a base film and imparting various functions to the base film. Such a base film is not particularly limited, and an appropriate film can be used. Specifically, polyester resins, acetate resins, polyethersulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, acrylic resins, polyvinyl chloride resins, polystyrene resins, polyvinyl resins Examples thereof include alcohol resins, polyarylate resins, polyphenylene sulfide resins, polyvinylidene chloride resins, and (meth) acrylic resins. Among these, polyester resins, polycarbonate resins, polyolefin resins and the like are particularly preferable. The thickness of the base film is generally selected from the range of 12 to 250 μm.

  Preferable examples of the functional optical film 1 include, for example, those in which a conductive thin film layer is formed on at least one surface of a base film. Here, the conductive thin film layer includes a conductive inorganic thin film and a conductive organic thin film. The thickness of the conductive thin film is generally about 3 nm to 200 nm. Examples of conductive inorganic materials that can be used include, for example, ITO (tin-doped indium oxide), ATO (antimony-doped tin oxide), zinc antimonate (composite of antimony oxide and zinc oxide), silver, copper, platinum, gold, nickel , Tin oxide, tin, zinc oxide, zinc and the like. Examples of the conductive organic material include polythiophene-based, polyacetylene-based, polyaniline-based, and polypyrrole-based conductive polymer compounds. Among these, ITO, ATO, zinc antimonate, silver and the like are preferably used from the viewpoint of performance, particularly transparency. The metal thin film is formed by a vacuum deposition method, a spuck ring method, an ion plating method, or the like.

  A film in which a conductive metal thin film layer is provided on such a base film is used as a transparent conductive film, and in addition to being used as a transparent electrode layer of a touch panel, the conductive metal thin film layer has an electromagnetic shielding effect. It is also used as a functional optical film for shielding electromagnetic waves.

  The functional optical film having an infrared shielding function is, for example, a near-infrared absorbing dye such as a copper atom, a copper compound, a phosphorus compound, a thiourea derivative, or a tungsten compound, and a suitable binder (for example, cellulose ester, polyamide, polycarbonate, polyester). And the like, a thin film layer (thickness is generally about 0.1 to 20 μm) formed on one side of the base film. The “infrared shielding function” refers to a function of shielding a line spectrum in the near infrared region of 800 to 1000 nm.

  By imparting hard coat properties to the functional optical film, the chemical resistance, scratch resistance, etc. of the functional optical film can be improved. The hard coat property is imparted to one side of the base film, for example, a cured film (hard coat layer) made of a curable resin such as a melanin resin, a urethane resin, an alkyd resin, an acrylic resin, or a silicone resin. The thickness is generally about 0.1 to 10 μm).

  In a flat panel display, it is preferable to prevent reflection of external light from the viewpoint of suppressing a decrease in image contrast of a display image. When providing an antireflection function to a functional optical film, a fluorine-containing resin such as a fluorine resin, a silicone resin Is formed by forming a layer (thickness is generally about 0.01 to 10 [mu] m) on one side of the base film.

  Hard coat properties and antireflection functions are generally imparted to the functional optical film of the outermost layer of the optical film laminate, and a functional optical film having only these functions may be used. A functional optical film having a hard coat property or an antireflection function on one side of the base film and a function other than these on the other side of the base film is disposed in the outermost layer of the optical film laminate. This is advantageous for reducing the thickness of the optical film laminate.

  The functional optical film can have one or more functions, and in the case of a functional optical film having two or more functions, for example, a conductive function, an electromagnetic wave shielding function, an infrared shielding function, an antireflection function, and a hard coat property. Is one aspect selected from the following: one aspect of the base film, one aspect different from this one function is imparted to the other side of the base film, It is also possible to give two or more functions to one side.

  The pressure-sensitive adhesive layer 2 used for laminating the functional optical film 1 in the optical film laminate a is transparent in the wavelength range of visible light, such as rubber, acrylic, silicone, emulsion, and hot melt. Known adhesives can be widely used. The thickness of the pressure-sensitive adhesive layer 2 is generally about 12 to 200 μm. From the viewpoint of product characteristics, the pressure-sensitive adhesive layer 2 is preferably provided in the form of a substrate-less double-sided pressure-sensitive adhesive sheet.

  In the present invention, the term “flat panel display” is a generic term for a plasma display (PDP), a liquid crystal display (LCD), an organic or inorganic electroluminescence display (ELD), a surface electrolytic display (SED), and the like. The optical film or optical film laminate for a flat panel display of the present invention is disposed on the display lens of the flat panel display 20 (lens body disposed on the front surface of the display module) or front display glass (on the front surface of the display module). Glass plate for protection) or directly attached to the display module 21 for use. Such attachment is performed by using a display lens or front display on the sheet surface opposite to the optical film laminate a side of the pressure-sensitive adhesive sheet b mainly composed of a polyoxyalkylene polymer attached to one side of the optical film laminate a. It is performed by bonding to glass or display module 21. In the case of a directly attached optical film, the sheet surface on the side opposite to the optical film of the pressure-sensitive adhesive sheet mainly composed of a polyoxyalkylene polymer attached to one side of one optical film is used as a display lens or front display glass or This is done by pasting it on the display module.

  The pressure-sensitive adhesive sheet b containing a polyoxyalkylene polymer as a main component is a transparent double-sided pressure-sensitive adhesive sheet that is highly transparent and rich in flexibility, and includes an optical film laminate a (or an optical film), a display lens, and a front display. The space between the glass and the display module 21 is filled with the pressure-sensitive adhesive sheet b containing a polyoxyalkylene polymer as a main component without leaving a gap, and the visibility of the display image on the flat panel display can be improved. The “display module” is a panel body (“display panel”) including a display material in a flat panel display and mounted with a driver IC for driving. For example, a liquid crystal module is a liquid crystal display (LCD). A driver IC for driving is mounted on a liquid crystal panel.

The pressure-sensitive adhesive sheet b mainly composed of a polyoxyalkylene polymer used in the present invention is preferably a cured product obtained by curing a composition containing the following A to C.
A: Polyoxyalkylene polymer having at least one alkenyl group in one molecule B: Compound containing two or more hydrosilyl groups on average in one molecule C: Hydrosilylation catalyst

  Here, there is no restriction | limiting in particular as a polyoxyalkylene type polymer which has at least 1 alkenyl group in 1 molecule of A component, Although various things can be used, Especially, the principal chain of a polymer is Those having a repeating unit represented by the following general formula (1) are preferred.

Formula (1): —R ¹ —O—
(Wherein R ¹ is an alkylene group)

R ¹ is preferably a linear or branched alkylene group having 1 to 14 carbon atoms, more preferably 2 to 4 carbon atoms.

Specific examples of the repeating unit represented by the general formula (1) include —CH ₂ O—, —CH ₂ CH ₂ O—, —CH ₂ CH (CH ₃ ) O—, —CH ₂ CH (C ₂ H _{5 ) O -, - CH 2 C} (CH 3) 2 O -, - CH 2 CH 2 CH 2 CH 2 O- and the like. The main chain skeleton of the polyoxyalkylene polymer may be composed of only one type of repeating unit, or may be composed of two or more types of repeating units. In particular, a polymer having —CH ₂ CH (CH ₃ ) O— as the main repeating unit is preferred from the viewpoint of availability and workability. The main chain of the polymer may contain a repeating unit other than the oxyalkylene group. In this case, the total of oxyalkylene units in the polymer is preferably 80% by weight or more, and particularly preferably 90% by weight or more.

  The polymer of the component A may be a linear polymer or a branched polymer, and may be a mixture thereof. In order to obtain good adhesion, 50% by weight of the linear polymer is used. % Or more is preferable.

  The molecular weight of the component A polymer is preferably 500 to 50,000, and more preferably 5,000 to 30,000, in terms of number average molecular weight. When the number average molecular weight is less than 500, the resulting cured product tends to be too brittle, and conversely, when the number average molecular weight exceeds 50,000, the viscosity becomes too high and the workability tends to be remarkably lowered. This is not preferable. The number average molecular weight here is a value determined by a gel permeation chromatography (GPC) method.

  In addition, the polymer of component A preferably has a narrow molecular weight distribution in which the ratio of the weight average molecular weight to the number average molecular weight (Mw / Mn) is 1.6 or less, and Mw / Mn is 1.6 or less. In the polymer, the viscosity of the composition is lowered, and workability is improved. Therefore, Mw / Mn is more preferably 1.5 or less, and even more preferably 1.4 or less. In addition, Mw / Mn here is a value calculated | required by the gel permeation chromatography (GPC) method.

Here, the measurement of the molecular weight by GPC method is a polystyrene conversion value measured using a GPC apparatus (HLC-8120GPC) manufactured by Tosoh Corporation, and the measurement conditions are as follows.
Sample concentration: 0.2% by weight (THF solution)
Sample injection volume: 10 μl
Eluent: THF
Flow rate: 0.6 ml / min
Measurement temperature: 40 ° C
Column: Sample column TSKgel GMH-H (S)
Detector: Suggested refractometer

  In the polymer of component A (1) a polyoxyalkylene polymer having at least one alkenyl group in the molecule), the alkenyl group is not particularly limited, but the alkenyl group represented by the following general formula (2) is Is preferred.

Formula _{(2): H 2 C =} C (R 2) -
(Wherein R ² is hydrogen or a methyl group)

  The bonding mode of the alkenyl group to the polyoxyalkylene polymer is not particularly limited, and examples thereof include a direct bond of an alkenyl group, an ether bond, an ester bond, a carbonate bond, a urethane bond, and a urea bond.

As a specific example of the polymer of the A component,
Formula ^{_{(3): {H 2 C}} = C (R 3a) -R 4a -O} a 1 R 5a
(In the formula, R ^3a is hydrogen or a methyl group, R ^4a is a divalent hydrocarbon group having 1 to 20 carbon atoms, and one or more ether groups may be contained, and R ^5a is a polyoxy group. alkylene polymer residue, a ₁ is a positive integer.)
The polymer shown by these is mentioned. R ^4a in the formula, _{specifically, -CH 2 -, - CH 2} CH 2 -, - CH 2 CH 2 CH 2 -, - CH 2 CH (CH 3) CH 2 -, - CH 2 CH 2 CH ₂ CH ₂ —, —CH ₂ CH ₂ OCH ₂ CH ₂ —, —CH ₂ CH ₂ OCH ₂ CH ₂ CH ₂ — and the like can be mentioned, but —CH ₂ — is preferable from the viewpoint of ease of synthesis. .

In general formula ^{_{(4): {H 2 C}} = C (R 3b) -R 4b -OCO} a 2 R 5b
(In formula, R ^<3b> , R ^<4b> , R ^<5b> and a ^< ₂ > are synonymous with R ^{< 3a>} , R ^<4a> , R ^<5a> , a ^< ₁ >, respectively.
The polymer which has an ester bond shown by these is mentioned.

In general formula ^{_{(5): {H 2 C}} = C (R 3c)} a 3 R 5c
(In the formula, R ^3c , R ^5c and a ₃ have the same meanings as R ^3a , R ^5a and a ₁ , respectively.)
The polymer shown by these is also mentioned.

Moreover, the general formula ^_(6): in ^{{H 2 C = C (R} 3d) -R 4d -O (CO) O} a 4 R 5d ( ^{wherein, R 3d, R 4d, R} 5d and _{a 4,} respectively (It is synonymous with R ^3a , R ^4a , R ^5a and a _1. )
The polymer which has a carbonate bond shown by these is also mentioned.

  The alkenyl group should be present in at least 1, preferably 1 to 5, more preferably 1.5 to 3 in one molecule of the component A polymer. When the number of alkenyl groups contained in one molecule of the component A polymer is less than 1, the curability is insufficient, and when the number is more than 5, the network structure becomes too dense. May not be shown. In addition, the polymer of A component can be synthesize | combined according to the method of Unexamined-Japanese-Patent No. 2003-292926, and a commercial item can be used about what is marketed.

  A compound containing an average of two or more hydrosilyl groups in one molecule as component B can be used without particular limitation as long as it has a hydrosilyl group (a group having a Si—H bond), but easy acquisition of raw materials. From the viewpoint of compatibility with the sheath A, an organohydrogenpolysiloxane modified with an organic component is particularly preferable. The polyorganohydrogensiloxane modified with the organic component is more preferably one having 2 to 8 hydrosilyl groups on average in one molecule. Specifically showing the structure of the polyorganohydrogensiloxane, for example,

(In the formula, 2 ≦ m ₁ + n ₁ ≦ 50, 2 ≦ m ₁ , 0 ≦ n _1. R ^6a is a hydrocarbon group having 2 to 20 carbon atoms in the main chain and one or more phenyl groups. May be contained),

(In the formula, 0 ≦ m ₂ + n ₂ ≦ 50, 0 ≦ m ₂ , 0 ≦ n ₂ ) R ^6b is a hydrocarbon group having 2 to 20 carbon atoms in the main chain and one or more phenyl groups. May be contained),
Or

(In the formula, 3 ≦ m ₃ + n ₃ ≦ 20, 2 ≦ m ₃ ≦ 19, 0 ≦ n ₃ <18. R ^6c is one or more hydrocarbon groups having 2 to 20 carbon atoms in the main chain. Or a chain-like or cyclic group represented by the above, or two or more of these units,

(Wherein the _{1 ≦ m 4 + n 4 ≦} 50,1 ≦ m 4, 0 a ≦ _{n 4} ^{.R 6d} is the backbone one or more phenyl groups with a hydrocarbon group from 2 to 20 carbon atoms in the 2 ≦ b ₁ , R ^8a is a divalent to tetravalent organic group, and R ^7a is a divalent organic group, provided that R ^7a is not ^{dependent on} the structure of R ^8a . It does not matter.)

(In the formula, 0 ≦ m ₅ + n ₅ ≦ 50, 0 ≦ m ₅ , 0 ≦ n ₅ ; R _6e is a hydrocarbon group having 2 to 20 carbon atoms in the main chain and one or more phenyl groups. 2 ≦ b ₂ , R ^8b is a divalent to tetravalent organic group, and R ^7b is a divalent organic group, provided that R ^7b is not ^{dependent on} the structure of R ^8b . Or)

(In the formula, 3 ≦ m ₆ + n ₆ ≦ 50, 1 ≦ m ₆ , 0 ≦ n _6. R ^6f is a hydrocarbon group having 2 to 20 carbon atoms in the main chain, and one or more phenyl groups. 2 ≦ b _3. R ^8c is a divalent to tetravalent organic group, and R ^7c is a divalent organic group, provided that R ^7c is not ^{dependent on} the structure of R ^8c . It does not matter.)
And the like.

  The component B preferably has good compatibility with the components A and C or good dispersion stability in the system. In particular, when the viscosity of the whole system is low, if a component having low compatibility with the above components is used as the B component, phase separation may occur and poor curing may occur.

  Specific examples of the B component having relatively good compatibility with the A component and the C component or relatively stable dispersion stability include the following.

(In the formula, n ₇ is an integer of 4 or more and 10 or less.)

(In the formula, 2 ≦ m ₈ ≦ 10, 0 ≦ n ₈ ≦ 5, and R ^6g is a hydrocarbon group having 8 or more carbon atoms.)
Preferable specific examples of the component B include polymethylhydrogensiloxane. In order to ensure compatibility with the component A and to adjust the amount of SiH, α-olefin, styrene, α-methylstyrene, allyl are used. Examples include compounds modified with alkyl ethers, allyl alkyl esters, allyl phenyl ethers, allyl phenyl esters, and the like, and examples thereof include the following structures.

(Wherein 2 ≦ m ₉ ≦ 20 and 1 ≦ n ₉ ≦ 20)

  The component B can be synthesized by a known method, and commercially available products can be used for those that are commercially available.

In this invention, it does not specifically limit as a hydrosilylation catalyst which is C component, Arbitrary things can be used. Specifically, chloroplatinic acid; platinum alone; solid platinum supported on a carrier such as alumina, silica, carbon black; platinum-vinylsiloxane complex {for example, Pt _n (ViMe ₂ SiOSiMe ₂ Vi) _m , Pt [(MeViSiO) ₄ ] _m, etc.]; platinum-phosphine complex {eg, Pt (PPh ₃ ) ₄ , Pt (PBu ₃ ) ₄ etc.}; platinum-phosphite complex {eg, Pt [P (OPh) ₃ ] ₄ , Pt [P (OBu) ₃ ] ₄ etc}; Pt (acac) ₂ ; platinum-hydrocarbon complexes described in Ashby et al. US Pat. Nos. 3,159,601 and 3,159,662; Lamoreaux et al., US Pat. No. 3,220,972 And platinum alcoholate catalysts described in the above No. In the above formula, Me represents a methyl group, Bu represents a butyl group, Vi represents a vinyl group, Ph represents a phenyl group, acac represents acetylacetonate, and n and m represent an integer.

Examples of catalysts other than platinum compounds include RhCl (PPh ₃ ) ₃ , RhCl ₃ , Rh / Al ₂ O ₃ , RuCl ₃ , IrCl ₃ , FeCl ₃ , AlCl ₃ , PdCl ₂ .2H ₂ O, NiCl _2. , TiCl _{4 and the} like.
These catalysts may be used alone or in combination of two or more. From the viewpoint of catalytic activity, chloroplatinic acid, platinum-phosphine complex, platinum-vinylsiloxane complex, Pt (acac) _{2 and the} like are preferable.

The amount of component C is not particularly limited, but is generally 1 × 10 ⁻¹ mol or less, preferably 1 × 10 ⁻¹ mol or less, based on 1 mol of alkenyl groups in component A, from the viewpoint of ensuring the pot life of the composition and the transparency of the sheet. Although it is 5.3 × 10 ⁻² mol or less, it is more preferably 3.5 × 10 ⁻² mol or less, particularly preferably 1.4 × 10 ⁻³ mol or less, particularly from the viewpoint of the transparency of the sheet. When it exceeds 1 × 10 ⁻¹ mol with respect to 1 mol of the alkenyl group in the component A, the finally obtained sheet tends to yellow, and the transparency of the sheet tends to be impaired. If the amount of component C is too small, the curing rate of the composition tends to be slow and the curability tends to become unstable. Therefore, the amount of component C is preferably 8.9 × 10 ⁻⁵ mol or more. 1.8 × 10 ⁻⁴ mol or more is more preferable.

  The composition containing the above-described components A to C has a feature that it can exhibit adhesive properties (adhesive function to other objects) even if no tackifier resin is added or added in a small amount, and is obtained from the composition. Sheet having such excellent adhesive properties, it can be easily peeled off from such display lens, front display glass, display module, etc. after being adhered to flat panel display display lens, front display glass, display module, etc. Re-peelability that can be

  In such a composition, the hydrosilyl group of component B (compound B) is contained (blended) so that the functional group ratio is 0.3 or more and less than 5 relative to the alkenyl group of component A (compound A). More preferably, it is more preferably in the range of 0.5 or more and less than 4, and particularly preferably in the range of 0.55 or more and less than 3.5. If the functional group ratio is contained so as to exceed 5, the crosslinking density becomes high, and there is a possibility that the adhesive property cannot be obtained without adding or adding a small amount of tackifying resin. On the other hand, when the functional group ratio is less than 0.3, the cross-linking becomes too loose, and there are cases where adhesive residue is generated at the time of re-peeling and the property retention is lowered at high temperatures. Thus, by selecting the blending ratio of the A component and the B component within a specific range, good adhesive properties can be expressed without blending a tackifier resin, and it is cured at a sufficiently high line speed for practical use. Can be made.

  In addition, you may mix | blend a storage stability improving agent with this composition in order to improve storage stability. As this storage stability improving agent, a known compound known as a storage stabilizer for the component B can be used without limitation. For example, a compound containing an aliphatic unsaturated bond, an organic phosphorus compound, an organic sulfur compound, a nitrogen-containing compound, a tin compound, an organic peroxide, or the like can be preferably used. Specifically, 2-benzothiazolyl sulfide, benzothiazole, thiazole, dimethylacetylene dicarboxylate, diethylacetylene dicarboxylate, 2,6-di-t-butyl-4-methylphenol, butylhydroxyanisole, vitamin E, 2- (4-morpholinyldithio) benzothiazole, 3-methyl-1-buten-3-ol, 2-methyl-3-buten-2-ol, acetylenically unsaturated group-containing organosiloxane, acetylene alcohol , 3-methyl-1-butyl-3-ol, diallyl fumarate, diallyl maleate, diethyl fumarate, diethyl maleate, dimethyl maleate, 2-pentenenitrile, 2,3-dichloropropene, and the like. It is not limited to these.

Moreover, the adhesion | attachment imparting agent for improving the adhesiveness with respect to the display lens of a flat panel display, front display glass, a display module, etc. can be added as needed. Examples of the adhesion imparting agent include various silane coupling agents and epoxy resins. Among these, a silane coupling agent having a functional group such as an epoxy group, a methacryloyl group, or a vinyl group is preferable because it has a small effect on curability and a large effect on expression of adhesiveness. Moreover, the catalyst for making a silyl group or an epoxy group react can be added together with a silane coupling agent and an epoxy resin. In addition, in using these, the influence with respect to hydrosilylation reaction must be considered. Various fillers, antioxidants, ultraviolet absorbers, pigments, surfactants, solvents, and silicone compounds may be added as appropriate. Specific examples of the filler include silica fine powder, calcium carbonate, clay, talc, titanium oxide, zinc white, diatomaceous earth, barium sulfate and the like. Among these fillers, particularly silica fine powder, particularly fine powder silica having a particle size of about 50 to 70 nm (BET specific surface area of 50 to 380 m ² / g) is preferable, and among them, hydrophobic silica subjected to surface treatment However, it is particularly preferable because it has a great effect of improving the strength in a preferable direction. Furthermore, in order to improve the properties such as tack, a tackifying resin may be added as necessary. Examples of the tackifying resin include terpene resins, terpene phenol resins, petroleum resins, rosin esters, etc. It is possible to select freely according to.

  Further, from the viewpoint of improving the characteristics, it is possible to add resins such as phenol resin, acrylic resin, styrene resin, xylene resin. Moreover, it is possible to add adhesive components, such as an acrylic adhesive, a styrene block adhesive, and an olefin adhesive, for the same purpose.

The pressure-sensitive adhesive sheet b mainly composed of a polyoxyalkylene polymer used in the present invention is produced, for example, by the following method.
A polyoxyalkylene polymer (preferably a composition containing the components A to C) is charged into an agitator equipped with a vacuum function together with an organic solvent as necessary, and stirred in a vacuum state (under vacuum). Defoaming is performed, and the fluid after the vacuum defoaming is applied (cast) onto various supports and heat-treated to form a sheet. The coating on the support can be carried out by a known coating apparatus such as a roll coater such as gravure, kiss, or comma, a die coater such as slot or phantom, a squeeze coater, or a curtain coater. In the case of the composition containing the A to C components, the composition is heat-cured by heat treatment to obtain a sheet of a cured product. The heat treatment conditions at this time are preferably 50 to 200 ° C. (preferably 100 to 160 ° C.) and heated for about 0.01 to 24 hours (preferably 0.05 to 4 hours). In addition, what is necessary is just to use a well-known stirring apparatus with a vacuum apparatus as a stirring apparatus provided with said vacuum function, Specifically, a planetary type (revolution / autorotation system) stirring deaerator and a deaerator with a disper Etc. Moreover, as a grade of the pressure reduction at the time of performing vacuum defoaming, 10 kPa or less is preferable and 3 kPa or less is more preferable. Moreover, although stirring time changes with stirrers and the processing amount of a fluid, about 0.5 to 2 hours are preferable in general. By the defoaming treatment, there are substantially no bubbles in the sheet, and excellent optical properties (transparency) are exhibited. For example, the haze value is preferably 0.8 or less, more preferably 0.6 or less. The “haze value” here is a value measured by the following method.

  The pressure-sensitive adhesive sheet b containing a polyoxyalkylene polymer used in the present invention as a main component is usually coated with a composition on a first support (release sheet) that has been subjected to a release treatment, followed by a curing treatment. After the sheet is prepared, it is preferable that a second support (release sheet) that has been subjected to a release treatment is bonded thereon. In this way, it is possible to prevent unnecessary foreign matter from adhering to the sheet before the work for pasting it to the filter body. Also, the release sheet on one side is peeled off and the sheet is pasted to the filter body. As a result, the adhesion surface of the direct attachment filter to the flat panel display is covered with the release sheet, and a direct attachment filter with good handling property and good adhesion workability to the flat panel display can be achieved.

As the above support, films (sheets) made of synthetic resin or modified natural products, paper, all kinds of cloth, metal foil, and the like can be used. Specifically, for example, polyester such as polybutylene terephthalate (PBT), an ionomer resin in which molecules of an ethylene-methacrylic acid copolymer are cross-linked with metal ions (Na ⁺ , Zn ^2+, etc.), EVA (ethylene / vinyl acetate copolymer) , PVC (polyvinyl chloride), EEA (ethylene-ethyl acrylate copolymer), PE (polyethylene), PP (polypropylene), polyamide, polybutyral, polystyrene, etc .; polystyrene, polyolefin, polydiene, polychlorinated Vinyl, polyurethane, polyester, polyamide, fluorine, chlorinated polyethylene, polynorbornene, polystyrene / polyolefin copolymer, (hydrogenated) polystyrene / butadiene copolymer, polystyrene / vinyl Various thermoplastic elastomers exhibiting rubber elasticity such as polyisoprene copolymer systems; single layer films (sheets) made of polyolefins such as polyethylene and polypropylene blended with thermoplastic elastomers, polyolefins (polypropylene (PP) or Polyethylene (PE) etc./thermoplastic resin (eg EVA) / polyolefin, polyolefin (PP or PE) + thermoplastic elastomer / polyolefin (PP or PE), PP / PE / PP etc. multilayer (laminated), polyolefin + Examples thereof include multilayer (laminated) films (sheets) such as composite multilayers (laminated) in which the blend ratio of the thermoplastic elastomer is changed. Moreover, impregnated paper, coated paper, fine paper, craft paper, cloth, acetate cloth, non-woven cloth, glass cloth, and the like can be given. The thickness of the support is generally about 0.025 to 0.5 mm.

  Examples of the mold release treatment agent include a silicone type mold release agent, a fluorine type mold release agent, a long-chain alkyl type mold release treatment agent, etc. Among them, a silicone type mold release treatment agent is preferable, and a curing method is used. It is preferable to use a curing method such as ultraviolet irradiation or electron beam irradiation. Furthermore, among the silicone-based release treatment agents, cationically polymerizable UV-curable silicone release treatment agents are preferable. The cationic polymerizable UV curable silicone release treatment agent is a mixture containing a cationic polymerization type silicone (polyorganosiloxane having an epoxy functional group in the molecule) and an onium salt photoinitiator. It is particularly preferable that the photoinitiator is made of a boron photoinitiator, and a cationically polymerizable UV-curable silicone release agent in which such an onium salt photoinitiator is made of a boron photoinitiator is used. With this, particularly good peelability (releasability) can be obtained. The cationic polymerization type silicone (polyorganosiloxane having an epoxy functional group in the molecule) has at least two epoxy functional groups in one molecule, and is linear or branched or A mixture thereof may be used. The type of epoxy functional group contained in the polyorganosiloxane is not particularly limited as long as ring-opening cationic polymerization proceeds with an onium salt photoinitiator. Specific examples include γ-glycidyloxypropyl group, β- (3,4-epoxycyclohexyl) ethyl group, β- (4-methyl-3,4 epoxy cyclohexyl) propyl group and the like. Such cationic polymerization type silicone (polyorganosiloxane having an epoxy functional group in the molecule) is commercially available, and a commercially available product can be used. For example, UV9315, UV9430, UV9300, TPR6500, TPR6501 manufactured by Toshiba Silicone Co., Ltd., X-62-7622, X-62-7629, X-62-7655, X-62-7660, X-62-7660 manufactured by Shin-Etsu Chemical Co., Ltd. Examples thereof include Poly200, Poly201, RCA200, RCA250, and RCA251 manufactured by Arakawa Chemical Co., Ltd.

  Among the cationic polymerizable silicones, polyorganosiloxanes comprising the following structural units (A) to (C) are particularly preferable.

Further, in the polyorganosiloxane composed of the structural units (A) to (C), the composition ratio ((A) :( B) :( C)) of the structural units (A) to (C) is 50 to 95: What is 2-30: 1-30 (mol%) is especially preferable, and what is 50-90: 2-20: 2-20 (mol%) is especially preferable.
In addition, the polyorganosiloxane which consists of this structural unit (A)-(C) can be obtained as Poly200, Poly201, RCA200, X-62-7622, X-62-7629, X-62-7660.

On the other hand, known onium salt photoinitiators can be used without particular limitation. Specific examples include, for example, (R ¹ ) ₂ I ⁺ X ⁻ , ArN ₂ ⁺ X ⁻ , or (R ¹ ) ₃ S ⁺ X ⁻ , wherein R ¹ is an alkyl group and / or an aryl group. the, Ar is an aryl group, X ^- is _{[B (C 6 H 5)} 4] -, [B (C 6 F 5) 4] -, [B (C 6 H 4 CF 3) 4] -, [ (C ₆ F ₅ ) ₂ BF ₂ ] ⁻ , [C ₆ F ₅ BF ₃ ] ⁻ , [B (C ₆ H ₃ F ₂ ) ₄ ] ⁻ , BF ₄ ⁻ , PF ₆ ⁻ , AsF ₆ ⁻ , HSO ₄ ^-, or ClO ₄ ^- is a compound represented by) shows the like, among which, X in the formula ^-. is _{[B (C 6 H 5)} 4] -, [B (C 6 F 5 ₄ ] ⁻ , [B (C ₆ H ₄ CF ₃ ) ₄ ] ⁻ , [(C ₆ F ₅ ) ₂ BF ₂ ] ⁻ , [C ₆ F ₅ BF ₃ ] ⁻ , [B (C ₆ H ₃ F _{2 4]} ^- or BF ₄ ^-, Compound (boron photoinitiator) are preferred, particularly preferably _{^{(R 1) 2 I + [}} B (C 6 F 5) 4] ( wherein, ^{R 1} represents a substituted or unsubstituted A substituted phenyl group) (alkyliodonium, tetrakis (pentafluorophenyl) borate). As an onium salt-based photoinitiator, an antimony (Sb) -based initiator is conventionally known. However, when an antimony (Sb) -based initiator is used, heavy peeling occurs, and the pressure-sensitive adhesive sheet is removed from the support. It tends to be difficult to peel.

  The amount of the onium salt photoinitiator used is not particularly limited, but is preferably about 0.1 to 10 parts by weight with respect to 100 parts by weight of the cationic polymerization type silicone (polyorganosiloxane). If the amount used is less than 0.1 parts by weight, the silicone release layer may be insufficiently cured. If the amount used is larger than 10 parts by weight, it is not practical in terms of cost. When the cationic polymerization type silicone (polyorganosiloxane) and the onium salt photoinitiator are mixed, the onium salt initiator may be dissolved or dispersed in an organic solvent and mixed with the polyorganosiloxane. Specific examples of the organic solvent include alcohol solvents such as isopropyl alcohol and n-butanol; ketone solvents such as acetone and methyl ethyl ketone; ester solvents such as ethyl acetate.

Application | coating of a mold release processing agent can be performed using common coating apparatuses, such as a roll coater method, a reverse coater method, a doctor blade method, for example. The application amount (solid content) of the mold release treatment agent is not particularly limited, but is generally about 0.05 to 6 g / m ² .

  In addition, the adhesive sheet b has removability that can be peeled off from the glass plate after being pasted once on a glass substrate or the like, and even if pasted on the front display glass of a large area display, It can be easily peeled off. For example, it can be peeled with a peeling force of 200 N or less, preferably 150 N or less, against a glass plate of 50 inches (1028 mm × 774 mm). In the case of a general acrylic pressure-sensitive adhesive sheet, once it is attached to a glass plate of 50 inches (1028 mm × 774 mm), it cannot be peeled off.

  In the directly attached optical film laminate of the present invention, the thickness of the pressure-sensitive adhesive sheet b is preferably 10 to 1000 μm, more preferably 25 to 500 μm. If the thickness is less than 10 μm, the crack prevention function for the display module and the front glass plate tends not to be sufficiently developed from the viewpoint of shock absorption, and if it exceeds 1000 μm, there is a high possibility of wrinkling on the adhesive due to the manufacturing process. Therefore, the display performance tends to be deteriorated.

  By the way, in general, when bonding to a substrate or film using an adhesive layer or an adhesive sheet, air bubbles mixed between the adhesive layer (adhesive sheet) and the substrate or film are removed, and the adhesive layer (adhesive) In order to increase the adhesion between the sheet and the substrate or film, the resulting laminate is subjected to an autoclave treatment after the laminating operation, and the air bubbles (visible air bubbles) mixed in the laminate by the autoclave treatment ) Is removed. Accordingly, also in the present invention, the pressure-sensitive adhesive sheet b mainly composed of a polyoxyalkylene polymer is bonded to the optical film laminate a obtained by bonding the functional optical film 1 via the pressure-sensitive adhesive layer 2. Then, an autoclave process (pressurization and heating) is performed to complete the directly attached optical film laminate 10. The directly attached optical film laminate 10 becomes a non-defective product by the autoclave treatment, but when this is attached to the display lens of the liquid crystal display, the front display glass or the display module, the directly attached optical film laminate is several hours after the attachment. There was a problem that bubbles were generated at the interface between the body and the display lens or the front display glass or the display module and the appearance quality of the display was impaired. This problem also occurred in a direct-bonded optical film in which a pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component was bonded to one side of one functional optical film.

  As a result of researches conducted by the present inventors to investigate the cause of this problem, the autoclave treatment is performed by using the functional optical film 1 and the adhesive in the direct-bonding optical film laminate 10 when the laminate is formed. While removing the air bubbles mixed at the time of bonding of the sheet b, air gas is dissolved in the functional optical film 1, the pressure-sensitive adhesive layer 2 and the pressure-sensitive adhesive sheet b at the same time, and a laminate (directly bonded optical film laminate 10) is obtained. ) Immediately after being attached to the display lens or the front display glass or the display module 21, even if there are no bubbles at all, the gas dissolved after a few hours is still in the display lens or the front display glass or the display module 21 and the adhesive sheet. It turned out that it came out during b and appeared as a bubble. In addition, it was found that also in the directly attached optical film, air gas was dissolved in the functional optical film and the pressure-sensitive adhesive sheet, which appeared as bubbles. Therefore, the directly attached optical film or optical film laminate of the present invention is produced by the following method.

[First method]
(i) First step Two or more functional optical films 1 are bonded together via an adhesive layer 2, and the outermost functional optical film 1 has a film surface opposite to the adhesive layer 2 side. The pressure-sensitive adhesive sheet b containing an oxyalkylene polymer as a main component is bonded.
(ii) Second Step An autoclave treatment is performed on the laminate (adhesive optical film laminate) obtained in the first step.
(iii) 3rd process The degassing process which discharge | releases the dissolved air in the said laminated body is performed with respect to the laminated body (adhesive optical film laminated body) which passed through the 2nd process.

  The autoclave treatment in the second step is generally performed at a pressure of 0.1 to 1.0 MPa (preferably 0.3 to 0.8 MPa) from the viewpoints of adhesion between layers, removability of bubbles mixed during bonding, and the like. And a temperature: 25 to 80 ° C. (preferably 35 to 70 ° C.), and a pressure and heating treatment for 0.01 to 4 hours (preferably 0.1 to 2 hours) is preferable.

  The degassing treatment in the third step is not particularly limited as long as it is a treatment capable of releasing the dissolved air in the laminate through the second step to the outside of the laminate, but preferably the laminate is heated at normal pressure. A treatment placed under an atmosphere is mentioned. As used herein, “normal pressure” means 0.1013 ± 0.02 MPa, and “heating atmosphere” means an atmosphere having a temperature of 40 ° C. or higher.

  In particular, the temperature of the heating atmosphere is preferably equal to or higher than the glass transition temperature of the base film (transparent resin) of the functional optical film 1, and more preferably equal to or higher than the glass transition temperature + 1 ° C. When the temperature of the heating atmosphere is equal to or higher than the glass transition temperature of the base film (transparent resin), the dissolved air in the laminate can be released very efficiently. When the glass transition temperature of the base film is different between two or more functional optical films, the temperature of the heating atmosphere is preferably at least the glass transition temperature of the base film (transparent resin) having the highest glass transition temperature. is there.

  When the atmospheric temperature of the heating atmosphere is too high, the functionality tends to be significantly deteriorated due to shrinkage of the base film, so the upper limit of the atmospheric temperature is the glass transition temperature of the base film of the functional optical film + 20 ° C. or less. Is preferred. In addition, when the glass transition temperature of a base film differs between two or more functional optical films, the upper limit of atmospheric temperature exceeds 20 degreeC rather than the glass transition temperature of the base film of each functional optical film. It is preferable to set so as not to occur.

[Second method]
(i) 1st process The adhesive sheet which has a polyoxyalkylene type polymer as a main component is bonded together to the single side | surface of one functional optical film.
(ii) Second Step An autoclave treatment is performed on the adhesive optical film obtained in the first step.
(iii) Third Step Degassing treatment for releasing dissolved air is performed on the adhesive optical film that has undergone the second step.

  In addition, the "glass transition temperature of a base film" as used in the field of this invention is a measured value by the following method.

[Glass-transition temperature]
Measured with a cylindrical sample with a diameter of about 3 mm and a thickness of about 3 mm, using a differential scanning calorimeter (DSC).
(Measurement method and measurement conditions)
(1) Measuring equipment DSC200 manufactured by SII Nanotechnology
(2) Measurement conditions Measurement temperature range: -100 ° C to + 200 ° C
Temperature increase rate: 10 ° C / min
Atmospheric gas: Nitrogen (Flow rate: 200 ml / min)
(3) Analysis method When the baseline shift accompanying Tg is clearly observed in the measurement temperature range (−100 ° C. to + 200 ° C.), the straight line obtained by extending the low temperature side baseline to the high temperature side and the staircase accompanying Tg The point of intersection with the tangent drawn at the point where the slope of the curve of the state-changing portion is maximized is regarded as Tg.

  In general, the higher the atmospheric temperature, the shorter the time for degassing, but the treatment time is generally selected within the range of 0.1 to 240 hours depending on the atmospheric temperature.

  Specifically, for example, when the base film (transparent resin) is made of polyethylene terephthalate (PET), the glass transition temperature of polyethylene terephthalate (PET) is about 80 ° C. The ambient temperature is set to 81 ° C. or higher (preferably 85 ° C. or higher), and the laminate is placed in the atmosphere at a temperature of 81 ° C. or higher for about 0.1 to 2 hours to sufficiently release dissolved air in the laminate. can do.

  Note that the atmosphere gas of the heating atmosphere is usually air. Further, the degassing process is not particularly limited as long as it is an apparatus (a constant temperature apparatus) capable of maintaining a specified temperature from the viewpoint of productivity.

  The pressure-sensitive adhesive sheet containing the polyoxyalkylene polymer used in the present invention as a main component has good adhesiveness to the optical film or the optical film laminate, and is not necessarily subjected to autoclave treatment. Or it can adhere with a sufficiently high adhesive force to the optical film laminate. Therefore, even if only the optical film laminate is subjected to autoclave treatment, and then the adhesive sheet is bonded to the optical film laminate, the directly attached optical film laminate of the present invention has a stable structure in which the respective layers are in good contact with each other. Can be. Therefore, the directly attached optical film laminate of the present invention may be manufactured by the following third method.

[Third method]
(i) 1st process The 2 or more functional optical film 1 is bonded together through the adhesive layer 2. As shown in FIG.
(ii) Second Step An autoclave treatment is applied to the laminate (optical film laminate a) obtained in the first step.
(iii) Third Step After a pressure-sensitive adhesive sheet b mainly composed of a polyoxyalkylene polymer is bonded to one side of the laminate (optical film laminate a) subjected to the second step, the resulting laminate (adhesive) Degassing treatment is performed to release dissolved air in the optical film laminate.

  The autoclave treatment in the second step is performed at a pressure of 0.1 to 1.0 MPa (preferably 0.3 to 0.8 MPa) and a temperature from the viewpoints of adhesion between the layers, removability of bubbles mixed during bonding, and the like. : The process of pressurizing and heating for 0.01 to 4 hours (preferably 0.1 to 2 hours) under the condition of 25 to 80 ° C. (preferably 35 to 70 ° C.) is preferable.

  The degassing process in the third step may be performed in accordance with that of the first method, and the atmospheric pressure, the atmospheric temperature, and the processing time are the same as those of the first method.

  According to the directly attached optical film or optical film laminate of the present invention thus produced, the optical film or optical film laminate does not include a glass plate, and a flat panel display module, display lens, and front display glass The pressure-sensitive adhesive sheet, which is an adhesive layer, etc., has excellent transparency and excellent shock absorption even at a relatively thin thickness, and it is easy after it is once bonded to a display module, display lens, front display glass, etc. Since it has removability that can be peeled off, it is thin and lightweight, has an excellent shock absorbing function, and can be directly attached optical film or optical film laminate that can be easily re-peeled, and further, dissolved air can be removed. Since it is degassed to be released, it is attached to a display module, display lens, front display glass, etc. High-function direct-attached optical film or optical that does not generate bubbles at the interface between the display module, display lens, front display glass, etc. and the adhesive sheet, and does not reduce the quality or visibility of the display image on the display. A film laminate is obtained.

  The flat panel display with an optical film laminate of the present invention obtained by adhering the directly attached optical film or optical film laminate of the present invention to its display lens or front display glass or display module is a display and optical film or optical film laminate. Since there is no air layer with a low refractive index between the bodies, the visible light reflectance is not increased due to interface reflection, double reflection, etc., and visibility is improved. In addition, since the directly attached optical film or optical film laminate has excellent impact resistance, is thin and lightweight, it has excellent crack resistance of the display lens or front display glass or display module, and is thin and lightweight. It becomes a flat panel display that has been realized.

Hereinafter, the present invention will be described more specifically with reference to examples and comparative examples.
Example 1
<Production of adhesive sheet>
A polyoxyalkylene polymer as the A component (number average molecular weight: about 20,000) is added to the hydrosilyl compound as the B component (the amount of the hydrosilyl group is based on the alkenyl group amount of the polyoxyalkylene polymer as the A component). A composition (manufactured by Kaneka Corporation) containing a hydrosilylation catalyst as component C (0.62 mol with respect to 1 mol of alkenyl groups in component A) as a C component is stirred with a vacuum device. It put into the apparatus (Chitech Co., Ltd. mini dappo), and deaerated by stirring for 1 hour in a vacuum state (100 Pa). Next, the vacuum degassed composition was applied (cast) onto a polyester film (thickness: 50 μm) subjected to a release treatment using a roll coater at room temperature so that the thickness of the composition was 200 μm. did. The composition is cured by heating at 130 ° C. for 5 minutes in a heating oven, and a pressure-sensitive adhesive sheet (thickness: 50 μm) is bonded to the cured sheet obtained in this manner. (Measured thickness: 201 μm) was obtained.

<Preparation of direct-attached optical film laminate>
A transparent conductive film with a thickness of 50 μm (a substrate film made of a PET film with a thickness of 50 μm formed with a 200 nm thick ITO thin film) and a substrate-less transparent double-sided tape with a paste thickness of 50 μm (manufactured by Nitto Denko) Using a hand roller, a load of 2 kg is laminated once, and further, a transparent conductive film having a thickness of 50 μm (same as above) is bonded to one side of the substrate-less transparent double-sided tape in the same manner as above. A functional optical film having a thickness of 150 μm was produced. Furthermore, after sticking the prepared adhesive sheet, the obtained laminate was subjected to an autoclave treatment at 0.6 MPa and 65 ° C. for 40 minutes using an autoclave device manufactured by Kurihara Seisakusho.

  Next, the laminate after the autoclave treatment was allowed to stand for 4320 minutes at 25 ° C. and 25 ° C. and constant temperature and humidity, and degassed.

<Fabrication of flat panel display with filter>
The above-prepared direct-bonded optical film laminate is bonded to a glass plate (Matsunami Glass Co., Ltd. MICRO SLIDE GLASS product number S (0.7 mm thick)) assuming a flat panel display display lens or front display glass. It was set as the flat panel display with a laminated body.

Examples 2-8
Film having a material (conductive function of the same pressure-sensitive adhesive sheet and the optical film laminate in Example 1, a film having a conductive function, and using the substrate-less transparent double-sided tape, the condition of the condition and / or degassing autoclaving As shown in Table 1, a directly attached optical film laminate was produced, and the produced directly attached optical film laminate was assumed to be a flat panel display display lens or front display glass in the same manner as in Example 1. A flat panel display with a virtual filter was obtained by bonding to a plate (Matsunami Glass Co., Ltd., MICRO SLIDE GLASS part number S (0.7 mm thickness)).

  In Examples 6 to 8, the autoclave treatment was applied to a laminate (optical film laminate) obtained by bonding a film having a conductive function and a film having a conductive function through an adhesive layer, and then the pressure-sensitive adhesive sheet was used. A flat panel display with a virtual optical film laminate was obtained by pasting.

Comparative Example 1
A directly bonded optical film laminate (laminated product) obtained through autoclaving in the same manner as in Example 1 is not subjected to degassing treatment, and is a glass plate assuming a display lens of a flat panel display or a front display glass. (Matsunami Glass Co., Ltd. MICRO SLIDE GLASS product number S (0.7 mm thickness)) was bonded to obtain a flat panel display with a virtual optical film laminate.

Comparative Example 2
In the same manner as in Example 6, a filter body (laminate) obtained after the autoclave treatment was pasted without sticking an adhesive sheet to the optical filter laminate (laminate). Was bonded to a glass plate (Matsunami Glass Co., Ltd. MICRO SLIDE GLASS part number S (0.7 mm thickness)) assuming a flat panel display lens or front display glass to obtain a flat panel display with a virtual optical film laminate. .

  The optical film laminate directly pasted was observed in the interface between the glass plate and the pressure-sensitive adhesive sheet assuming a display lens or a front display glass in the flat panel display with a virtual optical film laminate produced in Examples 1 to 8 and Comparative Examples 1 and 2. Immediately after the pasting and 2 hours after the pasting, the presence or absence of bubbles was examined. Moreover, it evaluated by the following method about the removability with respect to the glass of a directly bonded optical film laminated body.

  In addition, an acrylic pressure-sensitive adhesive sheet was prepared by the following method, and virtual optics was used in the same manner as in Example 1 except that an acrylic pressure-sensitive adhesive sheet was used instead of the pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component. A flat panel display with a film laminate is manufactured (Comparative Example 3), and the observation of the interface between the glass plate and the adhesive sheet assuming the display lens or the front display glass in the flat panel display with the virtual optical film laminate is directly pasted optical film Immediately after the laminate was pasted and after 2 hours had passed since the pasting, the presence or absence of bubbles was examined. Moreover, the removability with respect to glass was evaluated by the following method.

[Removability to glass]
In Examples 1 to 8 and Comparative Examples 1 to 3, the evaluation of the presence or absence of bubbles was completed, and then the directly attached optical film laminate (laminate) was peeled from the glass by hand. It was evaluated whether or not there was a remaining adhesive on the glass surface after the optical film laminate was peeled off by hand. The case where the optical film laminate cannot be peeled from the glass surface is impossible (×), the case where the optical film laminate can be peeled off from the glass surface but the glue remains on the glass surface is acceptable (Δ), the optical film laminate from the glass surface Was evaluated as good (◯) when the film could be peeled off and no glue remained on the glass surface.

DESCRIPTION OF SYMBOLS 1 Functional optical film 2 Adhesive layer 10 Directly bonded optical film laminated body 20 Flat panel display 21 Display lens or front display glass or display module a Optical film laminated body b Adhesive sheet which has a polyoxyalkylene polymer as a main component

Claims (10)

  An adhesive optical film in which an adhesive sheet mainly composed of a polyoxyalkylene polymer is attached to one side of one functional optical film, or two or more functional optical films are interposed through an adhesive layer. It is composed of an adhesive optical film laminate in which an adhesive sheet mainly composed of a polyoxyalkylene polymer is attached to one side of the laminated film laminate, and is subjected to a degassing treatment for releasing dissolved air. A directly attached optical film or an optical film laminate for a flat panel display.   The functional optical film has at least one of an electromagnetic wave shielding function, a conductive function, an antireflection function, an infrared shielding function, a polarizing function, and a hard coat property. Bonded optical film or optical film laminate. The directly attached optical film or optical film laminate for a flat panel display according to claim 1 or 2, wherein the pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component comprises a cured product of a composition containing the following components AC.
A: Polyoxyalkylene polymer having at least one alkenyl group in one molecule B: Compound having an average of two or more hydrosilyl groups in one molecule C: Hydrosilylation catalyst Two or more functional optical films are bonded together via an adhesive layer, and a polyoxyalkylene polymer is a main component on the film surface opposite to the adhesive layer side of the outermost functional optical film. The first step of bonding the adhesive sheet,
A second step of subjecting the adhesive optical film laminate obtained in the first step to autoclaving; and releasing the dissolved air in the laminate to the adhesive optical film laminate subjected to the second step. The manufacturing method of the direct-bonding optical film laminated body for flat panel displays which has a 3rd process which performs a degassing process. A first step of bonding two or more functional optical films through an adhesive layer;
A second step of subjecting the optical film laminate obtained in the first step to autoclaving,
Degassing to release dissolved air in the obtained adhesive optical film laminate after bonding an adhesive sheet mainly composed of a polyoxyalkylene polymer to one side of the optical film laminate having undergone the second step The manufacturing method of the direct-bonding optical film laminated body for flat panel displays which has a 3rd process of processing. A first step in which a pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component is bonded to one side of one functional optical film;
A second step of subjecting the adhesive optical film obtained in the first step to autoclave treatment, and a third step of performing degassing treatment for releasing dissolved air on the adhesive optical film having undergone the second step; The manufacturing method of the direct-bonding optical film for flat panel displays which has these.   The degassing process is a process of heating the adhesive optical film laminate for a predetermined time at a temperature equal to or higher than the glass transition temperature of the base plastic film of the functional optical film constituting the adhesive optical film or the adhesive optical film laminate. The method of any one of Claims 4-6.   Each functional optical film is a functional optical film having at least one of an electromagnetic wave shielding function, a conductive function, an antireflection function, an infrared shielding function, a polarizing function, and a hard coat property. The method of any one of these. The method according to any one of claims 4 to 8, wherein the pressure-sensitive adhesive sheet containing a polyoxyalkylene polymer as a main component comprises a cured product of a composition containing the following components A to C.
A: Polyoxyalkylene polymer having at least one alkenyl group in one molecule B: Compound having an average of two or more hydrosilyl groups in one molecule C: Hydrosilylation catalyst   An optical film or an optical film laminate, wherein the optical film or optical film laminate according to any one of claims 1 to 3 is attached to a display lens, a front display glass, or a display module. Body type flat panel display.

Images