TWI767017B - Polarizing plate with protective film - Google Patents

Polarizing plate with protective film Download PDF

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Publication number
TWI767017B
TWI767017B TW107121706A TW107121706A TWI767017B TW I767017 B TWI767017 B TW I767017B TW 107121706 A TW107121706 A TW 107121706A TW 107121706 A TW107121706 A TW 107121706A TW I767017 B TWI767017 B TW I767017B
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protective film
layer
polarizing
peeling
peeling force
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TW107121706A
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Chinese (zh)
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TW201906959A (en
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趙廷敏
市原正寛
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日商住友化學股份有限公司
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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
    • 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
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528—Polarisers

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Nonlinear Science (AREA)
  • Organic Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The present invention provides a polarizing plate with protective film in which a protective film affixed to a polarizing plate can be approprintely peeled off.
A polarizing plate with protective film 1 according to the present invention is formed by laminating a peelable protective film on at least one side of a polarizing layer 20. The first peeling force which is the peeling force between the polarizing layer 20 and the protective film 10 is 0.29 N/ 60 mm or more and 1 N/ 60 mm or less, and the second peeling force of the back surface, which is the surface opposite to the side facing the polarizing layer of the protective film 10, is 6 N/ 25 mm or more. The second peeling force is the peeling force between the back side and the tape when a tape for peeling force measurement is pasted on the back side.

Description

附保護膜之偏光板 Polarizing plate with protective film

本發明係有關一種附保護膜之偏光板。 The present invention relates to a polarizing plate with a protective film.

偏光板係貼合在液晶面板等顯示面板而使用。在貼合於顯示面板的偏光板，通常是在與顯示面板的貼合側之相反側的面貼合用以保護偏光板之保護膜。在進行顯示面板的組裝或檢査等之後，將此保護膜從偏光板剝離(例如專利文獻1等)。 The polarizing plate is used by being bonded to a display panel such as a liquid crystal panel. In the polarizing plate attached to the display panel, a protective film for protecting the polarizing plate is normally attached to the surface on the opposite side to the attaching side of the display panel. This protective film is peeled off from the polarizing plate after assembly, inspection, etc. of the display panel (for example, Patent Document 1, etc.).

[先前技術文獻] [Prior Art Literature] [專利文獻] [Patent Literature]

[專利文獻1]日本特開2014-59378號公報 [Patent Document 1] Japanese Patent Laid-Open No. 2014-59378

本發明的目的係提供一種附保護膜之偏光板，其可將貼在偏光板上的保護膜良好地剝離。 The object of the present invention is to provide a polarizing plate with a protective film, which can peel off the protective film attached to the polarizing plate well.

本發明係提供以下表示的附保護膜之偏光板。 The present invention provides a polarizing plate with a protective film shown below.

〔1〕一種附保護膜的偏光板，係在偏光層的至少一面積層可剝離的保護膜後而成者，其中前述偏光層與前述保護膜之間的剝離力亦即第1剝離力係0.29N/60mm以上1N/60mm以下，前述保護膜之面對前述偏光層之側的相反側之面亦即背面之第2剝離力係6N/25mm以上，前述第2剝離力係在前述背面貼合剝離力測定用膠帶時的前述背面與前述膠帶之間的剝離力。 [1] A polarizing plate with a protective film, which is formed after a peelable protective film is layered on at least one area of the polarizing layer, wherein the peeling force between the polarizing layer and the protective film, that is, the first peeling force is 0.29 N/60mm or more and 1N/60mm or less, the second peeling force on the opposite side of the protective film to the side facing the polarizing layer, that is, the backside, is 6N/25mm or more, and the second peeling force is attached to the backside The peeling force between the said back surface and the said tape at the time of peeling force measurement tape.

〔2〕如〔1〕項所述之附保護膜的偏光板，其中前述第2剝離力係15N/25mm以下。 [2] The polarizing plate with a protective film according to the item [1], wherein the second peeling force is 15 N/25 mm or less.

〔3〕如〔1〕或〔2〕項所述之附保護膜的偏光板，其中前述保護膜具有基材膜與設於前述基材膜上而配置在前述偏光層側之黏著層，前述黏著層的損耗係數tanδ係0.2以上。 [3] The polarizing plate with a protective film according to the item [1] or [2], wherein the protective film has a base film and an adhesive layer provided on the base film and disposed on the side of the polarizing layer, the The loss coefficient tanδ of the adhesive layer is 0.2 or more.

〔4〕如〔1〕至〔3〕項中任一項所述之附保護膜的偏光板，其中前述偏光層係具有偏光膜與設在前述偏光膜上的樹脂層之複合偏光層，前述保護膜係設在前述樹脂層上。 [4] The polarizing plate with a protective film according to any one of the items [1] to [3], wherein the polarizing layer is a composite polarizing layer comprising a polarizing film and a resin layer provided on the polarizing film, and the above A protective film is provided on the said resin layer.

〔5〕如〔4〕項所述之附保護膜的偏光板，其中前述樹脂層具有多層結構。 [5] The polarizing plate with a protective film according to the item [4], wherein the resin layer has a multilayer structure.

〔6〕如〔4〕或〔5〕項所述之附保護膜的偏光板，其中中前述偏光膜係已吸附、定向二色性色素的聚乙烯醇系樹脂層，前述樹脂層係增亮膜。 [6] The polarizing plate with a protective film according to the item [4] or [5], wherein the polarizing film is a polyvinyl alcohol-based resin layer to which dichroic dyes have been adsorbed and oriented, and the resin layer is a brightening membrane.

本發明的附保護膜之偏光板係可將貼在偏光板上之保護膜良好地剝離。 The polarizing plate with a protective film of the present invention can peel off the protective film attached to the polarizing plate well.

1‧‧‧附保護膜的偏光板 1‧‧‧Polarizing plate with protective film

10‧‧‧保護膜 10‧‧‧Protective film

11‧‧‧基材膜 11‧‧‧Substrate film

12‧‧‧第1黏著層(黏著層) 12‧‧‧First adhesive layer (adhesive layer)

20‧‧‧偏光層 20‧‧‧Polarizing layer

21‧‧‧偏光膜 21‧‧‧Polarizing film

22‧‧‧樹脂層 22‧‧‧Resin layer

25‧‧‧貼合層 25‧‧‧Lamination layer

30‧‧‧分離層 30‧‧‧Separation layer

35‧‧‧第2黏著層 35‧‧‧Second Adhesive Layer

第1圖呈示本發明的附保護膜之偏光板的一例之示意剖面圖。 Fig. 1 shows a schematic cross-sectional view of an example of the polarizing plate with a protective film of the present invention.

本實施形態的附保護膜之偏光板係在偏光層的至少一面積層可剝離的保護膜而成之附保護膜的偏光板，偏光層與保護膜之間的剝離力亦即第1剝離力係0.29N/60mm以上1N/60mm以下，保護膜之面對偏光層之側的相反側之面亦即背面之第2剝離力係6N/25mm以上。第2剝離力係在前述背面貼合剝離力測定用膠帶時的前述背面與前述膠帶之間的剝離力。 The polarizing plate with protective film of the present embodiment is a polarizing plate with protective film formed by layering a peelable protective film on at least one area of the polarizing layer, and the peeling force between the polarizing layer and the protective film, that is, the first peeling force is 0.29N/60mm or more and 1N/60mm or less, and the second peeling force of the surface opposite to the side facing the polarizing layer of the protective film, that is, the back surface, is 6N/25mm or more. The 2nd peeling force is the peeling force between the said back surface and the said tape when sticking the tape for peeling force measurement to the said back surface.

附保護膜的偏光板係在偏光層之面對保護膜之側的相反側之面(另一面)具有黏著層，可具有用以可剝離地塗覆此黏著層之分離層。 The polarizing plate with protective film has an adhesive layer on the opposite side (the other side) of the polarizing layer facing the protective film, and may have a separation layer for releasably coating the adhesive layer.

含在附保護膜的偏光板中之偏光層，可貼合在液晶面板或有機EL面板等顯示面板而使用。在顯示面板設置偏光層時，通常是透過將附保護膜的偏光板之分離層剝離後露出的黏著層，而將附保護膜的偏光板貼合在顯示面板。然後，進行顯示面板的組裝或檢驗等之後，再從貼合在顯示面板的附保護膜之偏光板將保護膜剝離。保 護膜的剝離係可藉由在保護膜的背面附接剝離用膠帶等剝離構件，將此剝離構件朝向預定的方向拉動而進行。 The polarizing layer contained in the polarizing plate with a protective film can be used by being attached to a display panel such as a liquid crystal panel or an organic EL panel. When the display panel is provided with the polarizing layer, the polarizing plate with the protective film is usually attached to the display panel through the adhesive layer exposed after peeling off the separation layer of the polarizing plate with the protective film. Then, after assembling or testing the display panel, the protective film is peeled off from the polarizing plate with the protective film attached to the display panel. The peeling of the protective film can be performed by attaching a peeling member such as a peeling tape to the back surface of the protective film, and pulling the peeling member in a predetermined direction.

如上述，保護膜因為會在顯示面板的組裝或檢驗等之後剝離，故在保護膜與偏光層之間，會有賦與在顯示面板的組裝步驟中或檢驗步驟中不易剝離的程度之接著力。因此，在使用上述剝離構件剝離保護膜時，可能產生未能剝離保護膜等剝離不良的問題。同時，上述的使用剝離構件進行保護膜的剝離，雖然可用人工或機械進行，但近年則用機械的自動化進行。在人工剝離中，因可在剝離步驟中微調剝離構件的拉伸方向或拉伸速度、施加在剝離構件的拉伸力等，故容易將保護膜良好地剝離。另一方面，在機械剝離中，因剝離構件的拉伸方向或拉伸速度、施加在剝離構件的拉伸力受到限制，故容易產生保護膜不能剝離等剝離不良的問題。 As described above, since the protective film is peeled off after the display panel is assembled or inspected, there is an adhesive force between the protective film and the polarizing layer that is difficult to peel off in the display panel assembly step or the inspection step. . Therefore, when peeling a protective film using the said peeling member, the problem of peeling defect, such as not peeling a protective film, may arise. Meanwhile, the above-mentioned peeling of the protective film using the peeling member can be performed manually or mechanically, but in recent years, it has been performed by automation of machinery. In manual peeling, since the drawing direction or drawing speed of the peeling member, the tensile force applied to the peeling member, and the like can be finely adjusted in the peeling step, the protective film can be easily peeled off favorably. On the other hand, in mechanical peeling, the stretching direction and speed of the peeling member, and the tensile force applied to the peeling member are limited, and problems such as failure to peel the protective film easily occur.

因此，針對保護膜與偏光層間的接著力高之情形以及以機械進行保護膜的剝離之情形如何良好地剝離保護膜之方法進行探討後，本發明人等發現，為實現保護膜的良好剝離時，僅將保護膜與剝離構件間的接著力作成大於偏光層與保護膜之間的接著力者並不足夠。而且，另外探討可將保護膜從偏光層良好地剝離之條件，結果發現藉由將保護膜的第2剝離力調節至6N/25mm以上，即可將保護膜從偏光層良好地剝離。因此，即使在保護膜與偏光層之間的接著力高之情形，或以機械進行保護膜的剝離之情形中，也可減少保護膜不能剝離等剝離不良，而可 良好地進行保護膜之剝離。只要是具有上述第2剝離力的附保護膜之偏光板，不論剝離保護膜的剝離速度為低速或高速，均可容易實現良好的保護膜之剝離。此外，藉由將保護膜的第2剝離力調節至6N/25mm以上，即便使用迄今仍在保護膜的剝離上使用的剝離用膠帶(剝離用構件)，也可提高剝離用膠帶與保護膜之背面間的接著力，可改善保護膜從偏光層的剝離性。 Therefore, when the adhesive force between the protective film and the polarizing layer is high, and when the protective film is peeled off mechanically, the present inventors have found that, in order to achieve good peeling of the protective film, the However, it is not enough to make the adhesive force between the protective film and the peeling member larger than the adhesive force between the polarizing layer and the protective film. Furthermore, the conditions under which the protective film can be favorably peeled off from the polarizing layer were also examined, and as a result, it was found that the protective film can be favorably peeled off from the polarizing layer by adjusting the second peeling force of the protective film to 6 N/25 mm or more. Therefore, even when the adhesive force between the protective film and the polarizing layer is high, or when the protective film is peeled off mechanically, the peeling defects such as the inability to peel the protective film can be reduced, and the protective film can be peeled off satisfactorily. . As long as it is a polarizing plate with a protective film having the second peeling force, good peeling of the protective film can be easily achieved regardless of whether the peeling speed of the protective film is low or high. In addition, by adjusting the second peeling force of the protective film to 6 N/25 mm or more, even if the peeling tape (peeling member) which has been used for peeling the protective film is used, the bond between the peeling tape and the protective film can be improved. The adhesive force between the back surfaces can improve the peelability of the protective film from the polarizing layer.

以下，參照圖面說明本發明的附保護膜之偏光板的較佳實施形態。第1圖表示附保護膜的偏光板之一例的示意剖面圖。 Hereinafter, preferred embodiments of the polarizing plate with a protective film of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing an example of a polarizing plate with a protective film.

如第1圖所示，附保護膜的偏光板1可在偏光層20的一面上積層保護膜10。如第1圖所示，保護膜10可為具有基材膜11與第1黏著層(黏著層)12者，此時，第1黏著層12配置在偏光層20側。可在附保護膜的偏光板1之偏光層20的另一面設置第2黏著層35，並且，也可設置用以保護此第2黏著層35之分離層30。 As shown in FIG. 1 , the polarizing plate 1 with a protective film may have the protective film 10 laminated on one surface of the polarizing layer 20 . As shown in FIG. 1 , the protective film 10 may have a base film 11 and a first adhesive layer (adhesive layer) 12 , and in this case, the first adhesive layer 12 is disposed on the side of the polarizing layer 20 . A second adhesive layer 35 may be provided on the other side of the polarizing layer 20 of the polarizing plate 1 with the protective film attached, and a separation layer 30 for protecting the second adhesive layer 35 may also be provided.

偏光層20可為至少含有偏光膜21且在偏光膜21積層樹脂層22而成的複合偏光層。樹脂層22只要是含有如後述的樹脂之層，即無特別的限制，例如可為光學機能層，亦可為保護層。偏光層20為具有樹脂層22的複合偏光層時，第1圖所示，樹脂層22配置在偏光膜21與保護膜10之間，可作成依偏光膜21、樹脂層22、保護膜10的順序積層之結構。偏光膜21與樹脂層22係可透過使用接著劑或黏著劑等形成之貼合層25而積層。 The polarizing layer 20 may be a composite polarizing layer in which at least a polarizing film 21 is included and a resin layer 22 is laminated on the polarizing film 21 . The resin layer 22 is not particularly limited as long as it is a layer containing a resin as described later, and may be, for example, an optical function layer or a protective layer. When the polarizing layer 20 is a composite polarizing layer having a resin layer 22, as shown in FIG. 1, the resin layer 22 is arranged between the polarizing film 21 and the protective film 10, and can be formed according to the polarizing film 21, the resin layer 22, and the protective film 10. Sequential layered structure. The polarizing film 21 and the resin layer 22 can be laminated through a bonding layer 25 formed using an adhesive, an adhesive, or the like.

雖然圖中未表示，但樹脂層係可配置在偏光膜21與第2黏著層35之間。此時，可作成例如依偏光膜21、樹脂層、第2黏著層35、分離層30積層而成的結構。樹脂層係可透過使用接著劑或黏著劑等形成之貼合層而與偏光膜21貼合。同時，偏光層20可僅在偏光膜21的一面含有樹脂層，也可在兩面含有樹脂層。 Although not shown in the drawings, the resin layer may be disposed between the polarizing film 21 and the second adhesive layer 35 . In this case, for example, the polarizing film 21 , the resin layer, the second adhesive layer 35 , and the separation layer 30 can be laminated. The resin layer can be bonded to the polarizing film 21 through a bonding layer formed using an adhesive, an adhesive, or the like. Meanwhile, the polarizing layer 20 may contain a resin layer only on one side of the polarizing film 21, or may contain a resin layer on both sides.

保護膜10係設成可從偏光層20剝離。保護膜10與偏光層20之間的剝離力亦即第1剝離力，通常是0.29N/60mm以上，並以0.3N/60mm以上為佳，也可以是0.4N/60mm以上，同時，通常是1N/60mm以下，並以0.9N/60mm以下為佳。保護膜10在基材膜11上具有第1黏著層12時，第1剝離力係以第1黏著層12與偏光層20之間的剝離力作為第1剝離力。第1剝離力的大小係取決於用以將保護膜10與偏光層20貼合之第1黏著層12的黏著力，以及作為保護膜10面對偏光層20之側的表面之材料或表面粗糙度等表面特性。保護膜10與偏光層20之間的第1剝離力係依據後述的實施例中說明之測定方法測得之值。 The protective film 10 is provided so as to be peelable from the polarizing layer 20 . The peeling force between the protective film 10 and the polarizing layer 20, that is, the first peeling force, is usually 0.29N/60mm or more, preferably 0.3N/60mm or more, and may be 0.4N/60mm or more. 1N/60mm or less, preferably 0.9N/60mm or less. When the protective film 10 has the 1st adhesive layer 12 on the base film 11, the 1st peeling force uses the peeling force between the 1st adhesive layer 12 and the polarizing layer 20 as a 1st peeling force. The magnitude of the first peeling force depends on the adhesive force of the first adhesive layer 12 for bonding the protective film 10 and the polarizing layer 20, and the material or surface roughness of the surface of the protective film 10 facing the polarizing layer 20 surface properties such as degree. The 1st peeling force between the protective film 10 and the polarizing layer 20 is a value measured according to the measurement method demonstrated in the Example mentioned later.

保護膜10之面對偏光層20之側的相反側之面亦即背面、與貼合在此背面的剝離力測定用膠帶之間的剝離力亦即第2剝離力係6N/25mm以上，並以7N/25mm以上為佳，而以8N/25mm以上更佳，可為9N/25mm以上，同時，通常是以15N/25mm以下為佳，並以13N/25mm以下更佳。 The surface opposite to the side of the protective film 10 facing the polarizing layer 20, that is, the back surface, and the peeling force between the tape for peeling force measurement attached to the back surface, that is, the second peeling force is 6N/25mm or more, and It is better to be above 7N/25mm, more preferably above 8N/25mm, and can be above 9N/25mm.

由於第2剝離力為6N/25mm以上，故偏光層20與保護膜10之間的第1剝離力為0.29N/60mm以上1N/60mm以下的附保護膜之偏光板1中，與保護膜10的剝離速度無關而可良好地剝離，同時，即使以人工或機械均可良好地剝離保護膜10。 Since the second peeling force is 6 N/25 mm or more, the first peeling force between the polarizing layer 20 and the protective film 10 is 0.29 N/60 mm or more and 1 N/60 mm or less. The protective film 10 can be peeled off well regardless of the peeling speed of the film, and the protective film 10 can be peeled off well even by hand or machine.

由於第2剝離力為15N/25mm以下，故在往上拉起位於由複數片附保護膜的偏光板1積層而成的積層物之最上方的附保護膜之偏光板1時，可抑制在複數片附保護膜的偏光板1重疊之狀態中被往上拉起的多重抓取之發生。在位於上述的積層物之上方的附保護之偏光板1之最下層的膜狀構件，與位於此最下層的膜狀構件之正下方作為附保護膜之偏光板1的最上層之保護膜10容易密合時，容易發生此種多重抓取。保護膜10的上述第2剝離力超過15N/25mm時，保護膜10的背面與分離層30等膜狀構件接觸時，容易趨使密合產生，故可認為容易產生上述的多重抓取的問題。又，關於附保護膜的偏光板1之最下層，在附保護膜的偏光板1具有分離層30時為分離層30，在附保護膜的偏光板1不具有第2黏著層35及分離層30時，係偏光層20中的最外側(與保護膜10側的反對側)之層。 Since the second peeling force is 15 N/25 mm or less, when the polarizing plate with a protective film 1 located on the uppermost layer of a laminate of a plurality of polarizing plates with a protective film 1 is pulled up, it can be suppressed that the The occurrence of multiple grabs that are pulled up when a plurality of polarizers 1 with protective films are overlapped. The film-like member of the lowermost layer of the polarizing plate with protection 1 located above the above-mentioned laminate, and the protective film 10 of the uppermost layer of the polarizing plate with a protective film 1 located directly under the film-like member of the lowermost layer. Such multiple grasping is likely to occur when the adhesion is easy. When the second peeling force of the protective film 10 exceeds 15 N/25 mm, when the back surface of the protective film 10 comes into contact with a film-like member such as the separation layer 30, adhesion tends to occur easily, and it is considered that the above-mentioned problem of multiple gripping is likely to occur. . In addition, the lowermost layer of the polarizing plate 1 with a protective film is the separation layer 30 when the polarizing plate 1 with a protective film has the separation layer 30, and the polarizing plate 1 with a protective film does not have the second adhesive layer 35 and the separation layer. At 30, it is the layer on the outermost side (the opposite side to the protective film 10 side) of the polarizing layer 20 .

保護膜10的第2剝離力為在保護膜10的背面貼合剝離力測定用膠帶時之保護膜10的背面與膠帶之間的剝離力，其係根據後述實施例中說明的測定方法測定之值。剝離力測定用膠帶係例如在聚酯膜的基材片形成 有熱硬化性橡膠系黏著劑層者。 The second peeling force of the protective film 10 is the peeling force between the backside of the protective film 10 and the tape when the tape for measuring peeling force is attached to the backside of the protective film 10, and it is measured according to the measurement method described in the examples described later. value. The adhesive tape for peel force measurement is, for example, one in which a thermosetting rubber-based adhesive layer is formed on a base sheet of a polyester film.

剝離力測定用膠帶係進行如下表示的剝離試驗3次以上而得的各別剝離力之值，為13N/25mm±1N/25mm的範圍者。 The value of each peeling force obtained by carrying out the peeling test shown below 3 times or more, the tape for peeling force measurement is the range of 13N/25mm±1N/25mm.

<測定剝離力用膠帶的剝離試驗> <Peeling Test of Tape for Measuring Peeling Force>

(試驗片的準備) (Preparation of test pieces)

準備已將剝離力測定用膠帶之黏著面黏貼在玻璃基板(厚0.4mm，康寧(Corning)製造)的中央者。此時使用的剝離力測定用膠帶係具有25mm的寬度，具有要被夾在剝離裝置(後述)的夾具部分之長度至少5mm、以及在開始剝離試驗時與玻璃基板黏貼之黏貼部分的長度至少長度50mm的合計長度。同時，剝離力測定用膠帶係以下述狀態黏貼在玻璃基板：從剝離力測定用膠帶的長度方向之一端起至少橫跨50mm的長度貼在玻璃基板上，且從測定用膠帶的長度方向之另一端起至少5mm的長度雖位在玻璃基板但沒有貼在玻璃基板。將此種黏貼有剝離力測定用膠帶之玻璃基板，在溫度50℃、壓力0.6MPa的高壓釜中加壓20分鐘，然後，在溫度23℃、相對濕度50%的環境下保管24小時，作成試驗片。 The adhesive surface of the tape for peel force measurement was prepared by sticking the center of a glass substrate (thickness 0.4 mm, manufactured by Corning). The tape for measuring peeling force used at this time has a width of 25 mm, a length of at least 5 mm for a portion to be clamped by a jig of a peeling device (described later), and a length of at least 5 mm for the portion to be adhered to the glass substrate at the start of the peeling test 50mm total length. At the same time, the tape for measurement of peeling force is attached to the glass substrate in a state where it is attached to the glass substrate over a length of at least 50 mm from one end of the tape for measurement of peeling force in the longitudinal direction, and is attached to the glass substrate from the other end in the longitudinal direction of the tape for measurement of peeling force. A length of at least 5 mm from one end is located on the glass substrate but not attached to the glass substrate. The glass substrate to which the adhesive tape for measuring peeling force was attached was pressurized for 20 minutes in an autoclave at a temperature of 50°C and a pressure of 0.6 MPa, and then stored for 24 hours in an environment at a temperature of 23°C and a relative humidity of 50% to prepare test piece.

(剝離試驗) (peel test)

將上述中獲得的試驗片安裝在剝離裝置(LH-020N，今田製作所股份有限公司)。此時，將試驗片的玻璃基板固定在剝離裝置，用剝離裝置的夾具夾住試驗片的剝離力測定用膠帶之中未黏貼在玻璃基板的長度方向之上述另一 端。然後，用剝離速度3m/分鐘、剝離角度90°，以使剝離力測定用膠帶朝長度方向剝離之方式使試驗片的玻璃基板與試驗片之剝離力測定用膠帶的長度方向之上述另一端(用剝離裝置的夾具夾住的部分)相對移動，開始剝離力測定用膠帶的剝離，將剝離力測定用膠帶剛從玻璃基板剝離起，至剝離力測定用膠帶即將從玻璃基板完全剝離之前的剝離力，設成剝離力測定用膠帶的剝離力。 The test piece obtained above was attached to a peeling device (LH-020N, Imada Seisakusho Co., Ltd.). At this time, the glass substrate of the test piece was fixed to the peeling device, and the other end in the longitudinal direction of the glass substrate was not adhered to the tapes for measuring the peeling force in which the test piece was sandwiched between the jigs of the peeling device. Then, at a peeling speed of 3 m/min and a peeling angle of 90°, the glass substrate of the test piece and the other end ( The part clamped by the jig of the peeling device) is moved relatively, and the peeling of the tape for measuring peeling force is started, and the tape for measuring peeling force is peeled from the glass substrate immediately before the tape for measuring peeling force is completely peeled off from the glass substrate. The force was set as the peeling force of the tape for peeling force measurement.

保護膜10的第2剝離力，可依作為保護膜10的樹脂材料或保護膜10的表面粗糙度等表面特性來調整。保護膜10的表面粗糙度係可藉由例如電漿處理或電暈處理等表面活化處理而調整。 The second peeling force of the protective film 10 can be adjusted according to the resin material used as the protective film 10 or the surface properties such as the surface roughness of the protective film 10 . The surface roughness of the protective film 10 can be adjusted by surface activation treatment such as plasma treatment or corona treatment.

如形成附保護膜的偏光板1之偏光層20為含有樹脂層22的複合偏光層之情形一般偏光層20為具有數層的多層結構時，或如後述一般樹脂層22具有多層結構時，容易趨使保護膜10的剝離不穩定。藉由如同上述使保護膜10之背面的第2剝離力為6N/25mm以上，即使偏光層20為複合偏光層的附保護膜之偏光板1中，也可有效改善保護膜10之剝離特性。 If the polarizing layer 20 forming the polarizing plate 1 with protective film is a composite polarizing layer containing the resin layer 22, generally, when the polarizing layer 20 has a multilayer structure with several layers, or when the general resin layer 22 has a multilayer structure as described later, it is easy to The peeling of the protective film 10 tends to be unstable. By setting the second peeling force on the back surface of the protective film 10 to be 6N/25mm or more as described above, even if the polarizing layer 20 is the polarizing plate 1 with a protective film having a composite polarizing layer, the peeling characteristics of the protective film 10 can be effectively improved.

如第1圖所示，保護膜10具有基材膜11與第1黏著層12時，第1黏著層12係以損耗係數tan為0.2以上為佳，並以0.5以上更佳，以1.0以上又更佳，通常是5以下，並以3以下更佳。損耗係數tan為0.2以上時，因第1黏著層12的黏性變高、彈性變低，故容易產生上述剝離不良的問題。因此，第1黏著層12的損耗係數 tan為0.26以上的附保護膜之偏光板1中，藉由將第2剝離力設成6N/25mm以上，可有效改善保護膜10的剝離特性。損耗係數tanδ，可由下述式計算出。 As shown in FIG. 1, when the protective film 10 has the base film 11 and the first adhesive layer 12, the loss coefficient tan of the first adhesive layer 12 is preferably 0.2 or more, more preferably 0.5 or more, and 1.0 or more. More preferably, it is usually 5 or less, and more preferably 3 or less. When the loss coefficient tan is 0.2 or more, since the viscosity of the first adhesive layer 12 is increased and the elasticity is decreased, the above-described problem of poor peeling tends to occur. Therefore, in the polarizing plate 1 with a protective film in which the loss coefficient tan of the first adhesive layer 12 is 0.26 or more, the peeling characteristics of the protective film 10 can be effectively improved by setting the second peeling force to 6 N/25 mm or more. The loss coefficient tanδ can be calculated by the following formula.

tanδ={(第2剝離力[N/25mm])3.5/(第1剝離力[N/60mm])1.5}×0.0001 tanδ={(2nd peeling force [N/25mm]) 3.5 /(1st peeling force [N/60mm]) 1.5 }×0.0001

以下，說明作為附保護膜的偏光板之各構件。 Hereinafter, each member which is a polarizing plate with a protective film is demonstrated.

(保護膜) (protective film)

保護膜可為以具有自行黏著性的樹脂層構成，亦可為基材膜與積層在基材膜上的第1黏著層(黏著層)者。具有自行黏著性的樹脂，可舉出由聚丙烯系樹脂、聚乙烯系樹脂，或此等之混合物、共聚合物等所成之膜。 The protective film may be composed of a resin layer having self-adhesive properties, or may be a base film and a first adhesive layer (adhesive layer) laminated on the base film. The resin having self-adhesive properties includes films made of polypropylene-based resins, polyethylene-based resins, mixtures thereof, copolymers, and the like.

基材膜係可使用具有透光性(較佳的是光學透明)之熱塑性樹脂而得。熱塑性樹脂係可舉出由如鏈狀聚烯烴系樹脂(聚丙烯系樹脂等)、環狀聚烯烴系樹脂(降冰片烯系樹脂等)的聚烯烴系樹脂；如三乙醯基纖維素、二乙醯基纖維素的纖維素酯系樹脂；聚酯系樹脂；聚碳酸酯系樹脂；(甲基)丙烯酸系樹脂；聚苯乙烯系樹脂；或此等的混合物、共聚合物等所成之膜。本說明書中「(甲基)丙烯酸」係指選自丙烯酸及甲基丙烯酸中的至少一方。 The base film can be obtained by using a thermoplastic resin having light transmittance (preferably optically transparent). Thermoplastic resins include polyolefin-based resins such as chain polyolefin-based resins (polypropylene-based resins, etc.), cyclic polyolefin-based resins (norbornene-based resins, etc.); Cellulose ester resins of diacetyl cellulose; polyester resins; polycarbonate resins; (meth)acrylic resins; polystyrene resins; film. In this specification, "(meth)acrylic acid" means at least one selected from acrylic acid and methacrylic acid.

具有自行黏著性的保護膜及具有黏著層的保護膜之基材膜，可含有1種或2種以上如潤滑劑、塑化劑、分散劑、熱安定劑、紫外線吸收劑、紅外線吸收劑、抗靜電劑、抗氧化劑的添加劑。具有自行黏著性的保護膜 之厚度及具有黏著層的保護膜之基材膜的厚度係以200μm以下為佳，並以100μm以下更佳，而以50μm以下又更佳，同時，就強度及使用性之觀點而言，通常是5μm以上。 The base film of the protective film with self-adhesion and the protective film with an adhesive layer can contain one or more than two kinds such as lubricants, plasticizers, dispersants, heat stabilizers, ultraviolet absorbers, infrared absorbers, Antistatic agent, antioxidant additive. The thickness of the protective film with self-adhesion and the thickness of the base film of the protective film with an adhesive layer are preferably 200 μm or less, more preferably 100 μm or less, and even more preferably 50 μm or less. From the viewpoint of properties, it is usually 5 μm or more.

(第1黏著層) (1st adhesive layer)

保護膜為基材膜上設有第1黏著層的構造時，第1黏著層係可使用例如將(甲基)丙烯酸系樹脂、苯乙烯系樹脂、有機矽系樹脂、聚酯系樹脂、聚胺酯系樹脂、聚醚系樹脂等作為基礎聚合物，在此基礎聚合物加入如異氰酸酯化合物、環氧化合物、氮丙啶化合物的交聯劑之黏著劑組成物而形成。黏著劑組成物，可含有交聯觸媒、耐候穩定劑、增黏劑、塑化劑、軟化劑、染料、顏料等。第1黏著層的厚度係以2至45μm為佳，並以2至30μm更佳，而以5至10μm又更佳。 When the protective film has a structure in which the first adhesive layer is provided on the base film, the first adhesive layer can be, for example, a (meth)acrylic resin, a styrene resin, a silicone resin, a polyester resin, or a polyurethane. Series resins, polyether resins, etc. are used as the base polymer, and the base polymer is formed by adding an adhesive composition of a crosslinking agent such as an isocyanate compound, an epoxy compound, and an aziridine compound. The adhesive composition may contain cross-linking catalyst, weathering stabilizer, tackifier, plasticizer, softener, dye, pigment, etc. The thickness of the first adhesive layer is preferably 2 to 45 μm, more preferably 2 to 30 μm, and still more preferably 5 to 10 μm.

(偏光膜) (polarizing film)

偏光膜係對自然光等入射光具有射出偏光的機能之光學構件。偏光膜係以直線偏光片為佳，可使用在經單軸延伸的聚乙烯醇系樹脂層吸附定向碘或二色性染料等二色性色素而成者。此種偏光膜，例如可對聚乙烯醇系樹脂膜施加單軸延伸、二色性色素的染色、硼酸處理等而製造。偏光膜的厚度，例如可為40μm以下，並以30μm以下為佳，而以20μm以下更佳，而以10μm以下又更佳，同時，通常是2μm以上。 A polarizing film is an optical member having a function of emitting polarized light to incident light such as natural light. The polarizing film is preferably a linear polarizer, and one obtained by adsorbing dichroic dyes such as directional iodine and a dichroic dye to a uniaxially stretched polyvinyl alcohol-based resin layer can be used. Such a polarizing film can be manufactured, for example, by applying uniaxial stretching, dyeing of a dichroic dye, boric acid treatment, and the like to a polyvinyl alcohol-based resin film. The thickness of the polarizing film can be, for example, 40 μm or less, preferably 30 μm or less, more preferably 20 μm or less, and more preferably 10 μm or less, and is usually 2 μm or more.

聚乙烯醇系樹脂層中使用的聚乙烯醇系樹脂係可使用聚乙酸乙烯酯系樹脂經皂化者。聚乙烯醇系樹 脂的皂化度，通常可作成80.0至100.0莫耳%的範圍，並以90.0至99.5莫耳%的範圍為佳，而以94.0至99.0莫耳%的範圍更佳。皂化度係可依據JIS K6726-1994求得。聚乙烯醇系樹脂可為部分改質的改質聚乙烯醇。 As the polyvinyl alcohol-based resin used in the polyvinyl-alcohol-based resin layer, a saponified polyvinyl acetate-based resin can be used. The degree of saponification of the polyvinyl alcohol-based resin is usually in the range of 80.0 to 100.0 mol %, preferably 90.0 to 99.5 mol %, and more preferably 94.0 to 99.0 mol %. The degree of saponification can be obtained according to JIS K6726-1994. The polyvinyl alcohol-based resin may be partially modified modified polyvinyl alcohol.

聚乙酸乙烯酯系樹脂，除了乙酸乙烯酯的均聚物之聚乙酸乙烯酯以外，可舉出乙酸乙烯酯及可與其共聚的其他單體之共聚物。可與乙酸乙烯酯共聚的其他單體，可列舉：例如不飽和羧酸類、烯烴類、乙烯醚類、不飽和磺酸類、具有銨基的(甲基)丙烯醯胺類等。 The polyvinyl acetate-based resin includes, in addition to polyvinyl acetate, which is a homopolymer of vinyl acetate, copolymers of vinyl acetate and other monomers that can be copolymerized therewith. Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, (meth)acrylamides having an ammonium group, and the like.

(樹脂層) (resin layer)

樹脂層，只要是含有樹脂之層即可而無特別的限制，可列舉：例如光學機能層或保護層。樹脂層可為單層結構，亦可為2層以上的多層結構，如為多層結構，各層之間可用接著劑貼合，亦可用黏著劑貼合。 The resin layer is not particularly limited as long as it contains a resin, and examples thereof include an optical function layer and a protective layer. The resin layer can be a single-layer structure or a multi-layer structure with two or more layers. In the case of a multi-layer structure, the layers can be pasted with an adhesive or an adhesive.

光學機能層係可列舉：例如相位差膜、增亮膜、眩機能膜、具有表面抗反射機能之膜、反射膜、兼具反射機能與透射機能的半透射反射膜、光擴散膜等。例如，偏光膜為吸附、定向二色性色素的聚乙烯醇系樹脂層時，光學機能層可作成增亮膜。光學機能層，可具有單層結構，也可具有2層以上的多層結構。 Examples of the optical function layer include retardation films, brightness enhancement films, glare films, films with surface antireflection functions, reflective films, semi-transmissive reflection films having both reflective and transmissive functions, light diffusion films, and the like. For example, when the polarizing film is a polyvinyl alcohol-based resin layer that adsorbs and orients a dichroic dye, the optical function layer can be used as a brightness enhancement film. The optical function layer may have a single-layer structure or a multilayer structure of two or more layers.

保護層只要是為保護偏光膜或光學機能層的目的而設置者即可，而無特別的限制，例如可為上述的具有自行黏著性之保護膜，或與使用具有黏著層的保護膜之基材膜相同的熱塑性樹脂而成之膜。同時，保護層，可 為例如硬塗層、防污層、抗靜電層等表面處理層(塗料層)。保護層，可為單層結構，亦可具有2層以上的多層結構。 The protective layer is not particularly limited as long as it is provided for the purpose of protecting the polarizing film or the optical functional layer. A film made of the same thermoplastic resin as the material film. Meanwhile, the protective layer may be a surface treatment layer (paint layer) such as a hard coat layer, an antifouling layer, and an antistatic layer. The protective layer may have a single-layer structure or a multi-layer structure of two or more layers.

(第2黏著層) (2nd adhesive layer)

第2黏著層係可使用與形成第1黏著層的黏著劑組成物之相同者。形成第1黏著層及第2黏著層的黏著劑組成物，可互為相同亦可互不相同。同時，第2黏著層的厚度係以2至45μm為佳，並以2至30μm更佳，而以5至10μm又更佳。第2黏著層的厚度，可與第1黏著層的厚度互為相同，也可互不相同。 For the second adhesive layer, the same adhesive composition as that used to form the first adhesive layer can be used. The adhesive compositions forming the first adhesive layer and the second adhesive layer may be the same or different from each other. Meanwhile, the thickness of the second adhesive layer is preferably 2 to 45 μm, more preferably 2 to 30 μm, and still more preferably 5 to 10 μm. The thickness of the second adhesive layer may be the same as or different from the thickness of the first adhesive layer.

(分離層) (separating layer)

分離層係可使用已施加聚矽氧處理等離型處理之膜，可列舉：例如由聚對苯二甲酸乙二酯、聚對苯二甲酸丁二酯、聚碳酸酯、聚芳酯等各種樹脂所成之膜。 For the separation layer, a film to which a release treatment such as polysiloxane treatment has been applied can be used, and examples thereof include polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyarylate, etc. A film made of resin.

(貼合層) (lamination layer)

貼合層可為使用黏著劑組成物所形成的黏著層，亦可為使用接著劑組成物形成的接著層。黏著劑組成物，可舉出與上述第1黏著層及第2黏著層中使用的黏著劑組成物之相同者。接著劑組成物，可舉出水性接著劑組成物或活性能量線硬化性接著劑組成物。 The bonding layer may be an adhesive layer formed using an adhesive composition or an adhesive layer formed using an adhesive composition. As an adhesive composition, the thing similar to the adhesive composition used for the said 1st adhesive layer and a 2nd adhesive layer is mentioned. The adhesive composition includes an aqueous adhesive composition or an active energy ray-curable adhesive composition.

水性接著劑組成物，可舉出使用聚乙烯醇系樹脂或胺酯樹脂作為主成分的接著劑組成物。同時，活性能量線硬化性接著劑組成物，可舉出可藉由照射如紫外線、可見光、電子束、X射線的活性能量線而硬化的接著劑組成物。具體上，可舉出含有陽離子聚合性的環氧系化 合物作為硬化性成分的接著劑組成物、含有自由基聚合性的(甲基)丙烯酸系化合物作為硬化性成分的接著劑組成物。 The aqueous adhesive composition includes an adhesive composition using a polyvinyl alcohol-based resin or a urethane resin as a main component. Meanwhile, the active energy ray-curable adhesive composition includes an adhesive composition that can be cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. Specifically, an adhesive composition containing a cationically polymerizable epoxy compound as a curable component, and an adhesive composition containing a radically polymerizable (meth)acrylic compound as a curable component can be mentioned.

(附保護膜的偏光板之製造方法) (Manufacturing method of polarizing plate with protective film)

附保護膜的偏光板1係製作偏光膜21，視需要而積層樹脂層等而得偏光層20。例如第1圖所示，可將偏光膜21與樹脂層22透過貼合層25而積層而得偏光層20。此時，可在偏光膜21上形成貼合層25之後，在此貼合層25上積層樹脂層22，也可在樹脂層22上形成貼合層25，以此貼合層25與偏光膜21面對面的方式積層樹脂層22。 In the polarizing plate 1 with protective film, a polarizing film 21 is produced, and a resin layer or the like is laminated as necessary to obtain the polarizing layer 20 . For example, as shown in FIG. 1 , the polarizing layer 20 can be obtained by laminating the polarizing film 21 and the resin layer 22 through the bonding layer 25 . At this time, after forming the bonding layer 25 on the polarizing film 21, the resin layer 22 may be laminated on the bonding layer 25, or the bonding layer 25 may be formed on the resin layer 22, so that the bonding layer 25 and the polarizing film may be bonded together. The resin layers 22 are laminated so as to face each other.

接著，在積層在偏光膜21上的樹脂層22上積層保護膜10。此時，保護膜10在基材膜11上具有第1黏著層12時，係將第1黏著層12配置在偏光層20側。然後，亦可在與積層有偏光層20的保護膜10之側的相反側之面形成第2黏著層35。第2黏著層35可在偏光層20上形成，亦可在分離層30上形成第2黏著層35，使第2黏著層35與偏光層20面對面之方式使第2黏著層35與分離層30一起積層。 Next, the protective film 10 is laminated on the resin layer 22 laminated on the polarizing film 21 . At this time, when the protective film 10 has the first adhesive layer 12 on the base film 11, the first adhesive layer 12 is arranged on the polarizing layer 20 side. Then, the second adhesive layer 35 may be formed on the surface on the opposite side to the side on which the protective film 10 on which the polarizing layer 20 is laminated. The second adhesive layer 35 can be formed on the polarizing layer 20 , and the second adhesive layer 35 can also be formed on the separation layer 30 , and the second adhesive layer 35 and the separation layer 30 can be formed in such a way that the second adhesive layer 35 and the polarizing layer 20 face each other. Layer together.

[實施例] [Example]

以下，依照實施例及比較例以更具體的說明本發明，但本發明並非侷限於此等例之範圍者。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the scope of these Examples.

[第1剝離力的測定] [Measurement of the first peeling force]

保護膜與偏光層之間的第1剝離力係如下述測定。準備下述附保護膜的偏光板：將附保護膜的偏光板之偏光層 的吸收軸作為長度方向，而裁切出長度60mm、垂直於長度方向的寬度60mm的附保護膜的偏光板。此外，第1剝離力測定用膠帶係具有25mm的寬度，且具有被剝離裝置(後述)的夾具夾住的部分之長度至少10mm、以及在第1剝離力的測定開始時貼合於附保護膜的偏光板之保護膜的貼合部分之長度5至10mm的合計長度者。 The first peeling force between the protective film and the polarizing layer was measured as follows. The following polarizing plate with protective film was prepared: The polarizing plate with protective film having a length of 60 mm and a width perpendicular to the longitudinal direction of 60 mm was cut out with the absorption axis of the polarizing layer of the polarizing plate with protective film as the longitudinal direction. In addition, the tape system for the first peel force measurement has a width of 25 mm, has a length of at least 10 mm of a portion sandwiched by a jig of a peeling device (described later), and is attached to the protective film at the start of the measurement of the first peel force The total length of the bonding part of the protective film of the polarizing plate is 5 to 10 mm.

將上述中裁切出的附保護膜之偏光板的偏光層側，透過黏著劑而固定在玻璃基板(厚0.4mm，康寧製造)上，以溫度50℃、壓力0.6MPa在高壓釜中加壓20分鐘，然後在溫度23℃、相對濕度50%的環境下保管24小時。接著，在已固定在玻璃基板上的附保護膜之偏光板的保護膜之朝寬度方向延伸之端邊(垂直於吸收軸那邊)中的一端邊上，固定第1剝離力測定用膠帶。此時，第1剝離力測定用膠帶與保護膜的上述一端邊重疊的部分中，使第1剝離力測定用膠帶的寬度方向之中間點與保護膜的上述一方的端邊之中間點一致，同時使第1剝離力測定用膠帶在從上述一端邊起朝長度方向5至10mm的長度範圍中貼合在保護膜上，使第1剝離力測定用膠帶的剩餘部分從保護膜上朝長度方向突出而予以固定，以作成第1剝離力測定用的試驗片。 The polarizing layer side of the polarizing plate with the protective film cut out above was fixed on a glass substrate (thickness 0.4 mm, manufactured by Corning) through an adhesive, and pressurized in an autoclave at a temperature of 50°C and a pressure of 0.6 MPa 20 minutes, and then stored for 24 hours in an environment with a temperature of 23°C and a relative humidity of 50%. Next, a tape for measuring the first peeling force was fixed to one of the ends extending in the width direction (the side perpendicular to the absorption axis) of the protective film of the protective film-attached polarizer fixed on the glass substrate. At this time, in the part where the tape for measuring the first peeling force and the one end side of the protective film overlap, the middle point in the width direction of the tape for measuring the first peeling force and the middle point of the one end side of the protective film are aligned. At the same time, the tape for measuring the first peeling force was attached to the protective film over a length range of 5 to 10 mm in the longitudinal direction from the one end edge, and the remaining portion of the tape for measuring the first peeling force was directed in the longitudinal direction from the protective film. It protruded and fixed, and it was set as the test piece for 1st peeling force measurement.

將所得的第1剝離力測定用試驗片安裝在剝離裝置(LH-020N，今田製作所股份有限公司)上，用剝離裝置的夾具夾住上述第1剝離力測定用膠帶之剩餘部分(從保護膜上突出的部分)。接著，用剝離速度3m/分鐘、 剝離角度90°，以使保護膜朝長度方向剝離的方式，使第1剝離力測定用試驗片與上述第1剝離力測定用膠帶之剩餘部分(用剝離裝置的夾具夾住的部分)相對移動，開始令保護膜從第1剝離力測定用的試驗片之偏光層剝離。然後，測定從保護膜剝離至被貼合在保護膜上的第1剝離力測定用膠帶之長度方向的端部位置為止起，至保護膜即將從偏光板上完全剝離前之間的剝離力，作為第1剝離力。又，從第1剝離力測定用的試驗片開始保護膜的剝離時，當保護膜不能從偏光層剝離時，在貼合有第1剝離力測定用膠帶之側的上述一端邊中，從偏光層中剝離少許的保護膜而形成進行剝離的起始點而進行第1剝離力的測定。 The obtained test piece for measuring the first peeling force was mounted on a peeling device (LH-020N, Imada Seisakusho Co., Ltd.), and the remaining part of the above-mentioned first peeling force measuring tape (from the protective film) was clamped by the clamp of the peeling device. highlighted part above). Next, at a peeling speed of 3 m/min and a peeling angle of 90°, the test piece for measuring the first peeling force and the remaining portion of the tape for measuring the first peeling force (with a peeling device) were removed so that the protective film was peeled in the longitudinal direction. The part clamped by the jig) was relatively moved, and the protective film was started to be peeled off from the polarizing layer of the test piece for the first peel force measurement. Then, the peeling force from the time when the protective film was peeled off to the end position in the longitudinal direction of the first tape for measuring peeling force attached to the protective film and immediately before the protective film was completely peeled off from the polarizing plate was measured. as the first peeling force. In addition, when peeling of the protective film was started from the test piece for the first peel force measurement, when the protective film could not be peeled from the polarizing layer, the polarized light was removed from the above-mentioned one end side on the side to which the first peel force measurement tape was attached. The first peeling force was measured by peeling off a little of the protective film in the layer to form a starting point for peeling.

(第1剝離力測定用膠帶的特性) (Characteristics of the first peeling force measurement tape)

第1剝離力測定用的膠帶係使用下述試驗片以下述步驟進行3次以上的剝離試驗所得的各別剝離力之值為13N/25mm±1N/25mm的範圍者。 The adhesive tape for 1st peeling force measurement is the range of 13N/25mm±1N/25mm of the value of each peeling force obtained by carrying out the peeling test three or more times by the following procedure using the following test piece.

(試驗片) (Test piece)

準備已將第1剝離力測定用膠帶的黏著面黏貼在玻璃基板(厚0.4mm，康寧製造)的中央者。此時，剝離力測定用膠帶係使用具有25mm的寬度、以及具有被剝離裝置(後述)的夾具夾住之部分至少5mm、與剝離試驗開始時要與玻璃基板黏貼的黏貼部分之長度至少50mm之合計長度者。此外，將第1剝離力測定用膠帶在玻璃基板上黏貼成從第1剝離力測定用膠帶的長度方向之一端起至少橫跨50mm地貼在基板上，且從剝離力測定用膠帶的長度方向 之另一端起至少5mm的長度雖然位在玻璃基板但沒有貼在玻璃基板上的狀態。將如上述已黏貼有剝離力測定用膠帶之玻璃基板放在高釜中，以溫度50℃、壓力0.6MPa加壓20分鐘，然後，在溫度23℃、相對濕度50%的環境下保管24小時，作成試驗片。 Prepare what has been pasted on the center of a glass substrate (thickness 0.4 mm, manufactured by Corning) with the adhesive surface of the tape for measuring the first peeling force. At this time, the tape for peeling force measurement shall have a width of 25 mm, a portion that is clamped by a jig of a peeling device (described later) of at least 5 mm, and a length of at least 50 mm of the adhesive portion to be adhered to the glass substrate at the start of the peel test. total length. In addition, the 1st adhesive tape for peeling force measurement was attached to the glass substrate so as to be attached to the substrate over at least 50 mm from one end of the longitudinal direction of the first adhesive tape for peeling force measurement, and from the longitudinal direction of the adhesive tape for peeling force measurement A state in which a length of at least 5 mm from the other end is positioned on the glass substrate but not attached to the glass substrate. The glass substrate to which the tape for measuring peeling force was pasted as described above was placed in an autoclave, pressurized at a temperature of 50°C and a pressure of 0.6 MPa for 20 minutes, and then stored for 24 hours in an environment with a temperature of 23°C and a relative humidity of 50% , to make a test piece.

(剝離試驗) (peel test)

將上述中獲得的試驗片安裝在剝離裝置(LH-020N，今田製作所股份有限公司)。此時，將試驗片的玻璃基板固定在剝離裝置，用剝離裝置的夾具夾住試驗片的剝離力測定用膠帶之中未黏貼在玻璃基板上的長度方向之前述另一端。然後，以剝離速度3m/分鐘、剝離角度90°，以第1剝離力測定用膠帶朝長度方向剝離的方式，使試驗片的玻璃基板與試驗片的第1剝離力測定用膠帶之長度方向的前述另一端(用剝離裝置的夾具夾住之部分)相對移動，開始第1剝離力測定用的試驗片之剝離，將第1剝離力測定用的試驗片剛從玻璃基板剝離起，至第1剝離力測定用膠帶即將從玻璃基板上完全剝離前的剝離力，設為第1剝離力測定用膠帶的剝離力。 The test piece obtained above was attached to a peeling device (LH-020N, Imada Seisakusho Co., Ltd.). At this time, the glass substrate of the test piece was fixed to the peeling device, and the other end in the longitudinal direction of the tape for measuring peeling force of the test piece was sandwiched between the jigs of the peeling device and not adhered to the glass substrate. Then, at a peeling speed of 3 m/min and a peeling angle of 90°, the glass substrate of the test piece and the tape for measuring the first peeling force in the longitudinal direction of the test piece were peeled off in the longitudinal direction. The other end (the part clamped by the jig of the peeling device) is relatively moved to start the peeling of the test piece for the first peel force measurement. The peeling force immediately before the tape for measuring peeling force is completely peeled off from the glass substrate is referred to as the peeling force of the tape for measuring the first peeling force.

[第2剝離力的測定] [Measurement of the second peel force]

保護膜與剝離力測定用膠帶的第2剝離力係如下述地測定。將附保護膜的偏光板之偏光層的吸收軸作為長度方向，切取長度60mm以上、垂直於長度方向的寬度60mm之附保護膜的偏光板而準備好附保護膜的偏光板。此外，第2剝離力測定用膠帶係具有25mm的寬度、且具有要被 安裝在剝離裝置(後述)的夾具上之部分的長度至少5mm、與開始第2剝離力測定時要與附保護膜的偏光板之保護膜貼合之貼合部分的長度至少50mm之合計長度者。又，第2剝離力測定用膠帶係具有與在上述第1剝離力測定用膠帶之特性項目中說明過的剝離力為相同的剝離力。 The second peel force of the protective film and the tape for measuring peel force was measured as follows. Taking the absorption axis of the polarizing layer of the polarizing plate with protective film as the longitudinal direction, cut out the polarizing plate with protective film with a length of 60 mm or more and a width perpendicular to the longitudinal direction of 60 mm to prepare a polarizing plate with protective film. In addition, the tape system for the second peel force measurement has a width of 25 mm, and has a length of at least 5 mm of the portion to be attached to a jig of a peeling device (described later), and the tape with the protective film attached when the second peel force measurement is started. The length of the bonding portion where the protective film of the polarizing plate is bonded is at least 50mm in total. Moreover, the 2nd adhesive tape for peeling force measurement has the same peeling force as the peeling force demonstrated in the characteristic item of the said 1st adhesive tape for peeling force measurement.

用黏著劑將上述切取的附保護膜之偏光板的偏光層固定在玻璃基板(厚0.4mm，康寧製造)，以溫度50℃、壓力0.6MPa在高壓釜中加壓20分鐘，然後，在溫度23℃、相對濕度50%的環境下保管24小時。接著，在固定在玻璃基板上的附保護膜之偏光板的保護膜之中央，從第2剝離力測定用膠帶的長度方向之一端起至少橫跨50mm的長度貼在保護膜上，從第2剝離力測定用膠帶的長度方向之另一端起至少5mm的長度雖位在保護膜但未貼合在保護膜上，並將設成此狀態者設成第2剝離力測定用的試驗片。 The polarizing layer of the polarizing plate with the protective film cut out above was fixed on a glass substrate (thickness 0.4 mm, manufactured by Corning) with an adhesive, and pressurized in an autoclave at a temperature of 50° C. and a pressure of 0.6 MPa for 20 minutes, and then at a temperature of 50°C. Store for 24 hours at 23°C and 50% relative humidity. Next, at the center of the protective film of the polarizing plate with protective film fixed on the glass substrate, from one end in the longitudinal direction of the second peel force measurement tape, the tape is stuck on the protective film over a length of at least 50 mm. The adhesive tape for peel force measurement was positioned on the protective film but not bonded to the protective film by at least 5 mm from the other end in the longitudinal direction, and this state was used as a test piece for the second peel force measurement.

將獲得的第2剝離力測定用試驗片設置在剝離裝置(LH-020N，今田製作所股份有限公司)，用剝離裝置的夾具夾住第2剝離力測定用試驗片之第2剝離力測定用膠帶中未貼合在保護膜上的長度方向之另一端。然後，以剝離速度3m/分鐘、剝離角度90°，以使第2剝離力測定用膠帶剝離之方式使第2剝離力測定用試驗片與上述第2剝離力測定用膠帶之長度方向的上述另一端(用剝離裝置的夾具夾住之部分)相對移動，開始第2剝離力測定用膠帶之剝離，將第2剝離力測定用膠帶剛從保護膜剝離起，至 第2剝離力測定用膠帶即將從保護膜上完全剝離前的剝離力，設為第2剝離力。 The obtained test piece for measuring the second peeling force was set in a peeling device (LH-020N, Imada Seisakusho Co., Ltd.), and the tape for measuring the second peeling force of the test piece for measuring the second peeling force was sandwiched between the clamps of the peeling device. The other end in the length direction that is not attached to the protective film. Then, at a peeling speed of 3 m/min and a peeling angle of 90°, the test piece for measuring the second peeling force and the above-mentioned other part in the longitudinal direction of the tape for measuring the second peeling force were peeled off. One end (the part clamped by the jig of the peeling device) moves relatively to start the peeling of the tape for measuring the second peeling force. The tape for measuring the second peeling force is just peeled off from the protective film, and the tape for measuring the second peeling force is about to be peeled off. The peeling force before completely peeling off from the protective film was referred to as the second peeling force.

[損耗係數tanδ的計算] [Calculation of loss coefficient tanδ]

損耗耗數tanδ係由下述式計算出。 The loss tanδ is calculated by the following formula.

tanδ={(第2剝離力[N/25mm])3.5/(第1剝離力[N/60mm])1.5}×0.0001 tanδ={(2nd peeling force [N/25mm]) 3.5 /(1st peeling force [N/60mm]) 1.5 }×0.0001

[剝離性試驗] [Peelability test]

將各實施例及各比較例中獲得的附保護膜之偏光板，以黏著劑固定在玻璃基板(厚0.4mm，康寧製造)，以溫度50℃、壓力0.6MPa在高壓釜中加壓20分鐘，然後，在溫度23℃、相對濕度50%的環境下保管24小時。接著，在固定於玻璃基板上的附保護膜之偏光板的保護膜之朝寬度方向延伸的端邊(垂直於吸收軸之邊)中之一端邊，固定剝離用膠帶(具有與上述第1剝離力測定用膠帶之特性項目中說明過的剝離力相同的剝離力之膠帶)。此時，剝離用膠帶與保護膜的上述一端邊重疊之部分中，使剝離用膠帶的寬度方向之中間點與保護膜的上述一端邊的中間點一致，同時將剝離用膠帶固定成在從上述一端邊起於長度方向5至10mm之長度範圍貼合在保護膜，並使剝離用膠帶的剩餘部分從保護膜上朝長度方向突出，而作成剝離性試驗用試驗片。 The polarizing plate with protective film obtained in each example and each comparative example was fixed on a glass substrate (thickness 0.4mm, manufactured by Corning) with an adhesive, and pressurized in an autoclave at a temperature of 50°C and a pressure of 0.6MPa for 20 minutes , and then stored for 24 hours in an environment with a temperature of 23°C and a relative humidity of 50%. Next, on one of the end sides (sides perpendicular to the absorption axis) extending in the width direction of the protective film of the protective film-attached polarizer fixed on the glass substrate, a peeling tape (having the same A tape with the same peeling force as the peeling force described in the properties of the tape for force measurement). At this time, in the portion where the peeling tape and the one end side of the protective film overlap, the middle point in the width direction of the peeling tape is aligned with the middle point of the one end side of the protective film, and the peeling tape is fixed so as to extend from the above-mentioned side. One end was attached to the protective film from the length of 5 to 10 mm in the longitudinal direction, and the remaining part of the tape for peeling was protruded from the protective film in the longitudinal direction to prepare a test piece for a peelability test.

將獲得的剝離性測定用試驗片安裝在剝離裝置(LH-020N，今田製作所股份有限公司)上，用剝離裝 置的夾具夾住上述剝離用膠帶的剩餘部分(從保護膜上突出的部分)。然後，以剝離速度3m/分鐘、剝離角度90°，使剝離性測定用試驗片與上述的剝離力測定用膠帶之剩餘部分(用剝離裝置的夾具夾住的部分)朝長度方向相對移動。此剝離性試驗的結果係將可剝離保護膜者評估為剝離性良好，將剝離用膠帶不能從保護膜上剝離或不能剝離保護膜者，評估為剝離性不良。 The obtained test piece for peelability measurement was mounted on a peeling device (LH-020N, Imada Seisakusho Co., Ltd.), and the remaining part of the peeling tape (the part protruding from the protective film) was clamped by the clip of the peeling device. Then, at a peeling speed of 3 m/min and a peeling angle of 90°, the test piece for peelability measurement and the remaining portion of the above-mentioned tape for peeling force measurement (the portion clamped by the jig of the peeling device) were relatively moved in the longitudinal direction. As a result of this peelability test, those who could peel off the protective film were evaluated as having good peelability, and those who could not peel off the tape for peeling from the protective film or the protective film were evaluated as poor peelability.

〔實施例1〕 [Example 1]

(附保護膜的偏光板之製作) (Production of polarizing plate with protective film)

將聚乙烯醇系膜單軸延伸，用碘染色後獲得厚度8μm的偏光膜。在所得的偏光膜之一面，隔著由活性能量線硬化性樹脂所成的接著劑，積層厚度13μm的環狀烯烴系樹脂膜。接著，在偏光膜的另一面，隔著黏著劑而積層具有多層結構的增亮膜。然後，將具有第1黏著層的保護膜以第1黏著層配置在增亮膜側的方式積層。又，保護膜係藉由在其背面進行電暈處理，調整成表1表示的第2剝離力。 The polyvinyl alcohol-based film was uniaxially stretched and dyed with iodine to obtain a polarizing film with a thickness of 8 μm. On one surface of the obtained polarizing film, a cyclic olefin-based resin film having a thickness of 13 μm was laminated via an adhesive made of an active energy ray-curable resin. Next, on the other side of the polarizing film, a brightness enhancement film having a multilayer structure is laminated via an adhesive. Then, the protective film which has a 1st adhesive layer is laminated|stacked so that a 1st adhesive layer may be arrange|positioned on the brightness enhancement film side. Moreover, the protective film was adjusted to the 2nd peeling force shown in Table 1 by corona-treating the back surface.

其次，在上述環狀烯烴系樹脂膜上形成第2黏著層，將偏光層的吸收軸作為長度方向，裁切成沿著垂直於此長度方向的寬度方向之長度為60mm、沿著長度方向的長度成為60mm，而獲得附保護膜之偏光板。所得附保護膜之偏光板的偏光層係增亮膜/黏著層/偏光膜/接著層/環狀烯烴系樹脂膜的層結構。 Next, a second adhesive layer was formed on the cyclic olefin-based resin film, and the absorption axis of the polarizing layer was taken as the longitudinal direction, and the length along the width direction perpendicular to the longitudinal direction was 60 mm, and the length along the longitudinal direction was 60 mm. The length was 60 mm, and a polarizing plate with a protective film was obtained. The polarizing layer of the obtained polarizing plate with protective film is a layer structure of brightness enhancement film/adhesive layer/polarizing film/adhesive layer/cyclic olefin resin film.

對所得的附保護膜之偏光板中使用的保護膜、偏光層及第1黏著層測定第1剝離力、第2剝離力、 損耗係數tan，將其結果表示於表1中。同時，使用附保護膜的偏光板進行剝離性試驗，將其結果表示於表1中。 The first peeling force, the second peeling force, and the loss coefficient tan were measured for the protective film, polarizing layer, and first adhesive layer used for the obtained polarizing plate with protective film, and Table 1 shows the results. At the same time, the peelability test was performed using the polarizing plate with a protective film, and Table 1 shows the result.

〔實施例2至7、比較例1至6〕 [Examples 2 to 7, Comparative Examples 1 to 6]

除了使用具有表1表示的第1剝離力及第2剝離力的附保護膜之偏光板，將剝離性試驗作成表1中表示的剝離速度以外，其餘與實施例1相同的操作，獲得附保護膜的偏光板。又，保護膜係藉由在其背面及第1黏著層進行電暈處理，調整成表1表示的第1剝離力及第2剝離力。 Except that the polarizing plate with protective film having the first peeling force and the second peeling force shown in Table 1 was used, and the peelability test was carried out at the peeling speed shown in Table 1, the same operation as in Example 1 was carried out to obtain the protective film. film polarizer. Moreover, the protective film was adjusted to the 1st peeling force and the 2nd peeling force shown in Table 1 by corona-treating the back surface and the 1st adhesive layer.

對所得的附保護膜之偏光板中使用的保護膜、偏光層及第1黏著層測定第1剝離力、第2剝離力、損耗係數tanδ，將其結果表示於表1中。此外，使用附保護膜的偏光板進行剝離性試驗，將其結果表示於表1中。 The first peeling force, the second peeling force, and the loss coefficient tanδ were measured for the protective film, polarizing layer, and first adhesive layer used for the obtained polarizing plate with protective film, and the results are shown in Table 1. Moreover, the peelability test was performed using the polarizing plate with a protective film, and the result is shown in Table 1.

Figure 107121706-A0202-12-0021-1
Figure 107121706-A0202-12-0021-1

由表1表示的結果可知，藉由將第2剝離力設成6N/25mm以上，可得良好的保護膜之剝離性。由實施例1至7的結果可知，藉由將第2剝離力設成6N/25mm以上，即使在剝離速度大的嚴苛的剝離條件中，也可得到良好的保護膜之剝離性。 As can be seen from the results shown in Table 1, by setting the second peeling force to be 6 N/25 mm or more, favorable peelability of the protective film can be obtained. From the results of Examples 1 to 7, by setting the second peeling force to be 6 N/25 mm or more, even under severe peeling conditions with a large peeling speed, favorable peelability of the protective film can be obtained.

1‧‧‧附保護膜的偏光板 1‧‧‧Polarizing plate with protective film

10‧‧‧保護膜 10‧‧‧Protective film

11‧‧‧基材膜 11‧‧‧Substrate film

12‧‧‧第1黏著層(黏著層) 12‧‧‧First adhesive layer (adhesive layer)

20‧‧‧偏光層 20‧‧‧Polarizing layer

21‧‧‧偏光膜 21‧‧‧Polarizing film

22‧‧‧樹脂層 22‧‧‧Resin layer

25‧‧‧貼合層 25‧‧‧Lamination layer

30‧‧‧分離層 30‧‧‧Separation layer

35‧‧‧第2黏著層 35‧‧‧Second Adhesive Layer

Claims (6)

一種附保護膜的偏光板，係在偏光層的至少一面上積層可剝離的保護膜而成者，其中前述偏光層與前述保護膜之間的剝離力亦即第1剝離力係0.29N/60mm以上1N/60mm以下，前述保護膜之面對前述偏光層之側的相反側之面亦即背面之第2剝離力係9N/25mm以上，前述第2剝離力係在前述背面貼合剝離力測定用膠帶時的前述背面與前述膠帶之間的剝離力。 A polarizing plate with a protective film, which is formed by laminating a peelable protective film on at least one side of the polarizing layer, wherein the peeling force between the polarizing layer and the protective film, that is, the first peeling force is 0.29N/60mm More than 1N/60mm or less, the second peeling force of the opposite side of the protective film to the side facing the polarizing layer, that is, the backside, is 9N/25mm or more, and the second peeling force is measured on the backside bonding peeling force The peeling force between the aforementioned back surface and the aforementioned tape when the tape is used. 如申請專利範圍第1項所述之附保護膜的偏光板，其中前述第2剝離力係15N/25mm以下。 The polarizing plate with protective film according to claim 1, wherein the second peeling force is 15N/25mm or less. 如申請專利範圍第1或2項所述之附保護膜的偏光板，其中前述保護膜具有基材膜與設於前述基材膜上而配置在前述偏光層側之黏著層，前述黏著層的損耗係數tanδ係0.2以上。 The polarizing plate with a protective film according to claim 1 or 2, wherein the protective film has a base film and an adhesive layer disposed on the base film and disposed on the side of the polarizing layer, and the adhesive layer has The loss coefficient tanδ is 0.2 or more. 如申請專利範圍第1或2項所述之附保護膜的偏光板，其中前述偏光層係具有偏光膜與設在前述偏光膜上的樹脂層之複合偏光層，前述保護膜係設在前述樹脂層上。 The polarizing plate with protective film according to claim 1 or 2, wherein the polarizing layer is a composite polarizing layer comprising a polarizing film and a resin layer provided on the polarizing film, and the protective film is provided on the resin layer. 如申請專利範圍第4項所述之附保護膜的偏光板，其中前述樹脂層具有多層結構。 The polarizing plate with protective film according to claim 4, wherein the resin layer has a multi-layer structure. 如申請專利範圍第4項所述之附保護膜的偏光板，其中前述偏光膜係已吸附、定向二色性色素的聚乙烯醇系樹脂層， 前述樹脂層係增亮膜。 The polarizing plate with a protective film as described in item 4 of the scope of the application, wherein the polarizing film is a polyvinyl alcohol-based resin layer that has adsorbed and oriented dichroic dyes, The aforementioned resin layer is a brightness enhancement film.
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