KR20220103635A - Optical film wound body, optical film, optical member, image display device, method for manufacturing optical film wound body and method for inspecting quality of optical film wound body - Google Patents

Abstract

Provided is an optical film wound body in which occurrence of a scratch and a dent is suppressed or prevented because of hardness even if winding hardness is large. To this end, according to the present invention, the optical film wound body (100) is a wound body of an optical film (10). In the outermost layer of the optical film wound body (100), an average value H_a of plastic durometer hardness and plastic durometer hardness H_1 at a center point satisfy the formulas (1) and (2). In formulas (1) and (2), H_1 is plastic durometer hardness [N/m] at the center point in a width direction on a side directly opposite to a winding termination end of the optical film wound body (100), in an outermost layer of the optical film wound body (100). In addition, H_a is an average value [N/m] of plastic durometer hardness at five points of a point at which a distance from one end of 10 mm, in a width direction on a side directly opposite to the winding termination end of the optical film wound body (100), a point at a distance from the one end of W/4, a center point, a point at a distance from the other end of 10 mm, and a point at a distance from the other end of W/4, wherein W is the width [m] of the optical film (10) on a side directly opposite to the winding termination end of the optical film wound body (100).

Description

An optical film winding body, an optical film, an optical member, an image display apparatus, a manufacturing method of an optical film winding body, and the quality inspection method of an optical film winding body TECHNICAL FIELD OPTICAL FILM WOUND BODY AND METHOD FOR INSPECTING QUALITY OF OPTICAL FILM WOUND BODY}

TECHNICAL FIELD The present invention relates to an optical film wound body, an optical film, an optical member, an image display device, a method for manufacturing an optical film wound body, and a quality inspection method for an optical film wound body.

An optical film is manufactured as a long optical film on account of manufacturing efficiency, etc., and is stored as a wound body of the long optical film in many cases (patent document 1 etc.).

Japanese Patent Laid-Open No. 2014-108849

However, if the winding hardness of the optical film winding body (pressure or tension applied to the optical film) varies greatly depending on the place and the unevenness is large, for example, foreign substances are curled in the part where the winding hardness is large (pressure is concentrated) When it enters, there exists a possibility that a dent or a flaw may generate|occur|produce. On the other hand, if the winding hardness of the optical film winding body is loosened in order to prevent the occurrence of dents and scratches (when the tension applied to the optical film is loosened), defects (for example, wrinkles) occur in the optical film due to winding misalignment. Therefore, there exists a possibility that it may become impossible to supply an optical film to the next process.

Then, the present invention relates to an optical film wound body, an optical film, an optical member, an image display device, a method for manufacturing an optical film wound body, and an optical film wound body in which the occurrence of scratches and dents is suppressed or prevented even if the winding hardness is large and hard The purpose of this is to provide a quality inspection method of

In order to achieve the above object, the optical film wound body of the present invention,

As a wound body of an optical film,

In the outermost layer of the optical film wound body, the average value H _a of the plastic durometer hardness and the plastic durometer hardness H ₁ of the central point satisfy the following formulas (1) and (2).

In the above formulas (1) and (2),

H ₁ is the plastic durometer hardness [N/m] at the center point in the width direction on the opposite side to the end of the winding end of the optical film wound body in the outermost layer of the optical film wound body,

H _a is a point having a distance from one end of 10 mm, a distance from one end of W/4, a central point, and the other end in the width direction on the opposite side to the end of the winding end of the optical film wound body. It is an average value [N/m] of plastic durometer hardness in 5 points|pieces of the point whose distance is W/4, and the point whose distance from the said other end is 10 mm. However, W is the width [m] of the said optical film in the opposite side to the front-end|tip of the winding-up completion of the said optical film winding body.

The optical film of this invention is an optical film obtained by developing the optical film winding body of the said this invention.

The optical member of this invention is an optical member containing the optical film of this invention.

The image display apparatus of this invention is an image display apparatus containing the optical film of this invention, or the optical member of this invention.

The manufacturing method of the optical film wound body of this invention,

As a method of manufacturing the optical film wound body of the present invention,

A winding process of winding the optical film to manufacture the optical film winding body,

In the winding step, in the outermost layer of the optical film wound body, the average value H _a of the plastic durometer hardness and the plastic durometer hardness H ₁ at the center point satisfy the above formulas (1) and (2). It is characterized in that the film is wound.

The quality inspection method of the optical film wound body of the present invention,

As a quality inspection method of an optical film winding body,

In the outermost layer of the optical film wound body, the average value H _a of the plastic durometer hardness and the plastic durometer hardness H ₁ of the central point satisfy the above formulas (1) and (2) by measurement characterized by checking.

According to the present invention, even if the winding hardness is large and hard, the generation of scratches and dents is suppressed or prevented, an optical film wound body, an optical film, an optical member, an image display device, a method for manufacturing an optical film wound body, and an optical film wound body Quality inspection methods can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows an example of the optical film winding body of this invention.
FIG. 2 : is a figure which shows the optical film winding body similar to FIG. Fig. 2(a) is a side view; Fig. 2(b) is a plan view.
3 : is sectional drawing which shows an example of the optical film of this invention.
It is a figure which shows an example of the winding shift in the optical film winding body of this invention.

Next, the present invention will be described more specifically by way of example. However, this invention is not limited at all by the following description.

In the optical film wound body of the present invention, for example, the optical film may be an optical film having a plastic deformation amount of 85 nm or less and an elastic recovery factor of 80% or more when press-fitted by a nanoindentation method. In addition, in this invention, although the measuring method of the amount of plastic deformation and elastic recovery by the nanoindentation method is not specifically limited, For example, it can measure by the measuring method described in the Example mentioned later.

As for the optical film winding body of this invention, the relationship between the width|variety and length of the said optical film may satisfy|fill following formula (3), for example.

In the above formula (3),

W is the width [m] of the optical film,

L is the length [m] of the said optical film.

In the optical film wound body of the present invention, for example, in the outermost layer of the optical film wound body, the plastic durometer hardness and the thickness of the optical film at the measuring point of the plastic durometer hardness are represented by the following formula ( 4) may be satisfied. In addition, in this invention, although the measuring method of plastic durometer hardness and thickness is not specifically limited, For example, it can measure by the measuring method described in the Example mentioned later.

In the above formula (4),

H _a is a point having a distance from one end of 10 mm, a distance from one end of W/4, a central point, and the other end in the width direction on the opposite side to the end of the winding end of the optical film wound body. It is an average value [N/m] of plastic durometer hardness in 5 points|pieces of the point whose distance is W/4, and the point whose distance from the said other end is 10 mm. However, W is the width [m] of the said optical film in the opposite side to the front-end|tip of the winding-up completion of the said optical film winding body.

D _a is the average value [micrometer] of the said optical film thickness in the said 5 points|pieces which are the measuring points of the said plastic durometer hardness.

The optical film wound body of this invention may be an optical film in which the said optical film has an unevenness|corrugation on the surface, for example.

As for the optical film winding body of this invention, the said optical film may be an anti-glare film, for example.

As for the optical film winding body of this invention, the said optical film may be a hard coat film, for example.

As for the optical film winding body of this invention, the said optical film may be an anti-glare hard-coat film, for example.

A polarizing plate may be sufficient as the optical member of this invention, for example.

In the method for manufacturing an optical film wound body of the present invention, for example, the optical film may be an optical film having a plastic deformation amount of 85 nm or less and an elastic recovery factor of 80% or more when press-fitted by the nanoindentation method. do.

In the manufacturing method of the optical film wound body of this invention, the relationship between the width|variety and length of the said optical film may satisfy|fill the said Formula (3), for example.

In the manufacturing method of the optical film wound body of this invention, for example, in the said winding process, in the outermost layer of the said optical film wound body, the plastic durometer hardness and the said optical in the measuring point of the said plastic durometer hardness. You may wind the said optical film so that the thickness of a film may satisfy|fill the relationship of said Formula (4).

As for the manufacturing method of the optical film winding body of this invention, the optical film which has an unevenness|corrugation on the surface may be sufficient as the said optical film, for example.

In the manufacturing method of the optical film wound body of this invention, an anti-glare film may be sufficient as the said optical film, for example.

As for the manufacturing method of the optical film wound body of this invention, a hard-coat film may be sufficient as the said optical film, for example.

In the manufacturing method of the optical film wound body of this invention, the said optical film may be an anti-glare hard-coat film, for example.

The quality inspection method of the optical film wound body of the present invention is, for example, an optical film having a plastic deformation amount of 85 nm or less and an elastic recovery factor of 80% or more when the optical film is press-fitted by a nanoindentation method. may be confirmed by measurement.

The quality inspection method of the optical film winding object of this invention may confirm by measurement whether the relationship between the width|variety and length of the said optical film satisfy|fills said Formula (3), for example.

In the quality inspection method of the optical film winding body of the present invention, for example, in the outermost layer of the optical film winding body, the plastic durometer hardness and the thickness of the optical film at the measuring point of the plastic durometer hardness are, Whether or not the relationship of the above formula (4) is satisfied may be confirmed by measurement.

As for the quality inspection method of the optical film wound body of this invention, the optical film in which the said optical film has an unevenness|corrugation on the surface may be sufficient, for example.

In the quality inspection method of the optical film wound body of this invention, the said optical film may be an anti-glare film, for example.

As for the quality inspection method of the optical film winding object of this invention, a hard-coat film may be sufficient as the said optical film, for example.

As for the quality inspection method of the optical film winding object of this invention, the said optical film may be an anti-glare hard-coat film, for example.

A polarizing plate may be sufficient as the optical member of this invention, for example.

In the present invention, "weight" and "mass" may be applied interchangeably, unless otherwise specified. For example, "part by mass" may be applied in place of "part by weight", "part by weight" may be applied in place of "part by mass", and "mass %" may be applied in place of "% by weight". and "weight %" may be applied in place of "mass %".

[One. Winding body of optical film]

Hereinafter, the wound body of the optical film of this invention is demonstrated still more concretely, for example.

An example of the optical film wound body of this invention is shown in the perspective view of FIG. As illustrated, this optical film wound body 100 is a wound body of the optical film 10 . In the outermost layer of the optical film wound body 100, the average value [N/m] of the plastic durometer hardness at 5 points in the width direction on the opposite side to the end of the winding end of the optical film winding body [N/m] is H _a [N/m]. The five measurement points and the plastic durometer hardness at the measurement points are as follows. That is, let the center point of the width direction in the opposite side to the front-end|tip of the said optical film winding body on the opposite side be h1, and let the plastic durometer hardness in h1 be H1 _[ N/ _{m ]} . Let h ₂₁ be the point where the distance from one end in the width direction is 10 mm, and let the plastic durometer hardness at h ₂₁ be H ₂₁ [N/m]. Let h ₁₁ be the point where the distance from one end in the width direction is W/4, and let the plastic durometer hardness at h ₁₁ be H ₁₁ [N/m]. Let h ₂₂ be the point where the distance from the other end in the said width direction is 10 mm, and let plastic durometer hardness in h ₂₂ be H ₂₂ [N/m]. Let h ₁₂ be the point where the distance from the other end in the width direction is W/4, and let the plastic durometer hardness at h ₁₂ be H ₁₂ [N/m]. However, W is the width [m] of the said optical film in the opposite side to the front-end|tip of the winding-up completion of the said optical film winding body. The average value [N/m] of the plastic durometer hardness H ₁ , H ₂₁ , H ₁₁ , H ₂₂ , H ₁₂ at 5 points of h ₁ , h ₂₁ , h ₁₁ , h ₂₂ , and h ₁₂ [N/m], H _a [ N/m]. The average value H _a [N/m] of the plastic durometer hardness and the plastic durometer hardness H ₁ [N/m] of the central point h ₁ satisfy the above formulas (1) and (2).

In addition, in the present invention, "plastic durometer hardness" refers to the durometer hardness according to JIS K 6253, which is a JIS standard, and the reaction force when the roll (wound body) is pressed with a constant force from the outside in the winding core direction say Moreover, in this invention, although the measuring method of plastics durometer hardness is not specifically limited, For example, it can measure by the measuring method prescribed|regulated to said JISK6253.

About 5 points which are measurement points of plastic durometer hardness in said Formula ( ₁ ) and ( ₂ ), it is the same as h1, h21, h11, _h22 , _h12 demonstrated in FIG. ₁ , for example. Next, ₅ measurement points of these h1, _h21 , _h11 , _h22 , h12 demonstrated in FIG. ₁ are further demonstrated using FIG. FIG. 2 : is a figure which shows the optical film winding body similar to FIG. Fig. 2(a) is a side view; Fig. 2(b) is a plan view. In FIG.2(a), 100A shows the position of the winding-up completion front-end|tip of the winding object 100 in the outermost layer of the winding object 100. As shown in FIG. In addition, in the figure, 100B shows the position on the opposite side to 100A of winding-finished front-end|tip 100A of the winding object 100 in the outermost layer of the winding object 100. As shown in FIG. The positional relationship of ₅ measurement points h1, _h21 , _h11 , _h22 , _h12 in the width direction in the position of the winding-up completion front-end|tip 100A and the diametrically opposite side 100B to FIG.2(b) is shown. h ₁ is the center point of the width direction in the position of 100B. That is, as shown in the figure, if the width at the position of 100B is W [m], the distance from one end (the right end in the drawing) in the width direction at the position of 100B to h ₁ is W/2, and the other end The distance from (left end in the drawing) to h ₁ is also W/2. h ₂₁ is a point with a distance of 10 mm from one end (right end in the drawing) in the width direction at the position of 100B as shown in the figure. h ₁₁ is a point whose distance from one end (right end in the drawing) in the width direction at the position of 100B is W/4, as shown in the figure. Accordingly, the distance from the center point h ₁ to h ₁₁ is also W/4 as shown. h ₂₂ is a point having a distance of 10 mm from the other end in the width direction (the left end in the drawing) at the position of 100B. h ₁₂ is a point whose distance from the other end in the width direction (the left end in the drawing) at the position of 100B is W/4. Accordingly, the distance from the center point h ₁ to h ₁₂ is also W/4 as shown. As described in FIG. 1 , the plastic durometer hardness at five points of h ₁ , h ₂₁ , h ₁₁ , h ₂₂ , and h ₁₂ was determined by H ₁ , H ₂₁ , H ₁₁ , H ₂₂ , H ₁₂ [N /m], and the average value [N/m] of H ₁ , H ₂₁ , H ₁₁ , H ₂₂ , H ₁₂ is H _a [N/m]. The average value H _a [N/m] of the plastic durometer hardness and the plastic durometer hardness H ₁ [N/m] of the central point h ₁ satisfy the above formulas (1) and (2).

In the optical film wound body of the present invention, the average value H _a [N/m] of the plastic durometer hardness is 40 or more as shown in the above formula (1), but for example, 45 or more, 50 or more, 55 or more or 60 or more may be sufficient, for example, 100 or less, 90 or less, 80 or less, or 70 or less may be sufficient. In order to prevent the defect (for example, wrinkles, etc.) of the optical film by winding-off, H _a [N/m] needs 40 or more. On the other hand, it is preferable that H _a [N/m] is not too large from a viewpoint of generation|occurrence|production prevention, such as deformation|transformation prevention of a wound state, and puncture.

In the optical film wound body of the present invention, |(H _a -H ₁ ) |/H _a is 0 or more and 0.1 or less, as shown by the above formula (2), but for example, 0.01 or more and 0.02 or more. , 0.03 or more, or 0.04 or more may be sufficient, for example, 0.09 or less, 0.08 or less, 0.07 or less, or 0.06 or less may be sufficient. |( _{Ha -} H1)|/Ha shows that the difference according to the place of the winding hardness of an optical film winding object _is small, and there are few nonuniformities that /Ha is as small as 0.1 or less. The winding hardness of the optical film wound body is large (Equation (1)), and the difference depending on the location of the winding hardness is small, and there is little variation (Equation (2)), so that the winding hardness is large and hard, scratches and The optical film wound body of this invention by which generation|occurrence|production of a dent was suppressed or prevented can be provided.

The optical film wound body of this invention WHEREIN: As mentioned above, the plastic deformation amount when an optical film press-fits by the nanoindentation method may be 85 nm or less, for example. Moreover, as mentioned above, the said optical film may be an optical film whose elastic recovery factor at the time of press-fitting by the nanoindentation method is 80 % or more, for example. In this way, since the optical film itself is hard and difficult to deform, it is possible to further suppress or prevent point deformation defects such as dents. The plastic deformation amount may be, for example, 80 nm or less, 70 nm or less, 60 nm or less, or 50 nm or less, and the lower limit is not particularly limited, For example, it is a value exceeding 0 nm or 0 nm, For example, 10 nm or more may be sufficient. The elastic recovery factor may be, for example, 85% or more, or 90% or more, and the upper limit is not particularly limited. For example, 100% or 100% or less may be sufficient, and 95% or less may be sufficient as it.

Although the measuring method in particular of the said plastic deformation amount and the said elastic recovery factor is not specifically limited, For example, it can measure by the measuring method as described in the Example mentioned later.

As described above, the optical film wound body of the present invention has a numerical value L/W obtained by dividing the length L [m] of the optical film by the width W [m] of the optical film, 40 or more and 20000 or less (the above formula (3) ) may be In order to suppress or prevent the problem that it originates in the width|variety of an optical film being too narrow or length is too long, and a winding shift will occur when transporting a winding object, it is preferable that L/W is 20000 or less. In order not to impair the productivity of an optical film winding object due to the width|variety of an optical film being too wide, or length being too short, it is preferable that L/W is 40 or more. L/W may be, for example, 50 or more, 100 or more, 500 or more, or 1000 or more, for example, 15000 or less, 10000 or less, 5000 or less, or 3000 or less may be sufficient as it.

As described above, in the optical film wound body of the present invention, in the outermost layer of the optical film wound body, the average value H _a [N/m] of the plastic durometer hardness is the optical film at the measuring point of the plastic durometer hardness. The numerical value H _a /D _a divided by the average value D _a [micrometer] of the thickness of a film may be 0.25 or more and 7 or less (the said Formula (4)). It is preferable that H _a /D _a is 7 or less from a viewpoint of suppressing or preventing that marks, such as a wrinkle, remain easily on the optical film winding body itself, or the balance of optical film winding body hardness worsens. It is preferable that H _a /D _a is 0.25 or more from a viewpoint of suppressing or preventing risks, such as wrinkles, and winding shift|offset|difference resulting from winding-up of an optical film winding object being too loose. H _a /D _a may be, for example, 0.3 or more, 0.40 or more, 0.45 or more, 1.0 or more, or 2.0 or more, for example, 6.0 or less, 5.0 or less, 4.0 or less, or 3.0 or less.

[2. optical film]

Next, the optical film (it may be called "optical film of this invention" hereafter) in the optical film winding body of this invention is demonstrated concretely with an example.

Although the optical film of this invention is not specifically limited, For example, as mentioned above, the optical film which has an unevenness|corrugation on the surface may be sufficient. The optical film which has an unevenness|corrugation on the surface has a slippery surface easily, and when it is set as an optical film wound body, there exists a possibility that a winding shift may occur. However, if it is the optical film wound body of this invention, in order to suppress or prevent winding-off, even if winding-up hardness is greatly hardened, generation|occurrence|production of a flaw and a dent can be suppressed or prevented. Although it does not specifically limit as an optical film which has an unevenness|corrugation on the surface, For example, An anti-glare film, an anti-glare hard coat film, an anti-blocking process film, a shaping|molding film, an anti-reflection film, retardation film, a surface protection film, a separator (Release film) etc. are mentioned. The optical film of the present invention may be, for example, an anti-glare film, a hard coat film, an anti-glare hard coat film, or the like as described above, and for example, an anti-blocking treatment film, a shaping film, and a winding As long as generation|occurrence|production and suppression of a shift|offset|difference and a dent fault are possible, the surface flat film etc. which do not have unevenness|corrugation may be sufficient.

When the optical film of this invention has an unevenness|corrugation on the surface, the said uneven|corrugated shape is not specifically limited.

Although the structure of the optical film of this invention is not specifically limited, For example, the structure in which the functional layer (for example, coating layer) was formed on the light transmissive base material may be sufficient. Although the said light transmissive base material (it may be called "light transmissive base material (A)" hereafter) is not specifically limited, For example, it is as mentioned later. Although the said functional layer is not specifically limited, For example, a glare-proof layer, a hard-coat layer, an anti-glare hard-coat layer, an antireflection layer, retardation adjustment layer, a release film (separator), etc. may be sufficient. The functional layer (hereinafter, sometimes referred to as "functional layer (B)") may be, for example, a resin layer or a functional layer composed of, for example, a thermosetting resin, an ionizing radiation curing resin, or the like.

An example of the optical film of this invention is shown in the sectional drawing of FIG. As shown, in this optical film 10, the functional layer (B) 12 is laminated|stacked on one surface of the light transmissive base material (A)11. In the optical film 10 of FIG. 3, the functional layer (B) 12 is an anti-glare hard-coat layer. In the anti-glare hard coat layer (B) 12 , the particles 12b and the thixotropy imparting agent 12c are contained in the functional layer-forming resin 12a.

In addition, in this invention, although the said functional layer (B) may be formed only from resin, for example, it may contain other components. The said other component is not specifically limited, One type or multiple types may be sufficient, For example, as shown in FIG. 3, particle|grains, a thixotropy imparting agent, etc. may be sufficient.

Moreover, in the said functional layer (B), although the surface on the opposite side to the said light transmissive base material (A) may be flat, as shown in FIG. 3, for example, it may have unevenness|corrugation. As mentioned above, the surface of the optical film which has an unevenness|corrugation on the surface is slippery easily, and when it is set as an optical film wound body, there exists a possibility that a winding shift may occur. However, if it is the optical film wound body of this invention, in order to suppress or prevent winding-off, even if winding-up hardness is greatly hardened, generation|occurrence|production of a flaw and a dent can be suppressed or prevented.

Hereinafter, the said light transmissive base material (A) and the said functional layer (B) are further given and demonstrated as an example.

Although the said light transmissive base material (A) in particular is not restrict|limited, For example, a transparent plastic film base material etc. are mentioned. The transparent plastic film substrate is not particularly limited, but it is preferably excellent in light transmittance of visible light (preferably light transmittance of 90% or more) and excellent in transparency (preferably, haze value of 1% or less), For example, the transparent plastic film base material of Unexamined-Japanese-Patent No. 2008-90263 is mentioned. As the transparent plastic film substrate, one having optically little birefringence is preferably used. The optical film of the present invention may be used, for example, in a polarizing plate as a protective film, in this case, as the transparent plastic film substrate, triacetyl cellulose (TAC), polycarbonate, acrylic polymer, cyclic to norbor A film formed of polyolefin or the like having a nen structure is preferable. Moreover, in this invention, the said transparent plastic film base material may be the polarizer itself so that it may mention later. With such a configuration, since the structure of the polarizing plate can be simplified by eliminating the need for a protective layer made of TAC or the like, the number of manufacturing steps for the polarizing plate or image display device can be reduced, and production efficiency can be improved. Moreover, if it is such a structure, a polarizing plate can be made thin more. Moreover, when the said transparent plastic film base material is a polarizer, the said functional layer (B) may also serve as a protective layer, for example. Moreover, if it is such a structure, an optical film will serve also as a cover plate, when it attaches to the liquid crystal cell surface, for example.

In the present invention, the thickness of the light-transmitting substrate (A) is not particularly limited, but considering points such as workability such as strength and handleability and thin layer properties, for example, 10 to 500 µm, 20 to 300 micrometers, or the range of 30-200 micrometers. The refractive index in particular of the said light transmissive base material (A) is not restrict|limited. The refractive index is, for example, in the range of 1.30 to 1.80 or 1.40 to 1.70.

As for the optical film of this invention, resin contained in the said light transmissive base material (A) may contain the acrylic resin, for example.

As for the optical film of this invention, the said light transmissive base material (A) may be an acrylic film, for example.

As for the optical film of this invention, as mentioned above, the surface on the opposite side to the said light transmissive base material in the said functional layer (B) may have unevenness|corrugation, for example. Moreover, 5 % or more may be sufficient as the external haze value resulting from the said unevenness|corrugation, for example. In a highly anti-glare film, the overall appearance is blurred in white, and there is a fear that black and white shading is likely to occur. From a viewpoint of suppressing or preventing this, and from a viewpoint of suppressing projection, it is preferable that the said external haze value is as large as possible. On the other hand, from the viewpoint of suppressing or preventing deterioration of the display characteristics (eg, the image becomes blurry, the contrast in a dark place is lowered, etc.), it is preferable that the external haze value is not too large. Although the said external haze value is not specifically limited, For example, 5 % or more, 10 % or more, 15 % or more, or 20 % or more may be sufficient, For example, 50 % or less, 45 % or less, 40 % or less, Or 35 % or less may be sufficient. In this invention, although the measuring method of the said external haze value is not specifically limited, For example, it can measure with the measuring method of following (1)-(3).

(1) The total haze value of the optical film of this invention is measured based on the method based on JISK7136.

(2) A light-transmitting adhesive is laminated on the surface opposite to the light-transmitting base material (A) in the functional layer (B) of the optical film of (1) above, and further, a COP film (manufactured by Nippon Zeon Corporation, trade name) ZEONOR film) is affixed to manufacture a laminated body. When this laminate is measured by the same measurement method as the measurement method of the total haze value in accordance with JIS K 7136 (that is, the measurement method in (1) above), the internal haze value of the optical film of (1) above is obtained. can This internal haze value is the haze value which excluded the influence of the said unevenness|corrugation of the outermost surface on the said functional layer (B) side from all the haze values of said (1).

(3) Let the numerical value obtained by subtracting the internal haze value measured in said (2) from the total haze value measured in said (1) be the external haze value of the optical film of said (1).

The optical film of this invention WHEREIN: Resin contained in the said functional layer (B) is although it does not specifically limit, For example, you may contain acrylate resin (it is also mentioned an acrylic resin).

As for the optical film of this invention, resin contained in the said functional layer (B) may contain urethane acrylate resin, for example.

In the optical film of this invention, the said functional layer (B) may be formed of the copolymer of the oligomer and monomer which have a functional group, for example. Although it does not specifically limit as an oligomer which has the said functional group, For example, curable urethane acrylate resin etc. are mentioned. As said curable urethane acrylate resin, the brand name "UV-1700TL" by Mitsubishi Chemical Co., Ltd. product, "UT-7314" by Mitsubishi Chemical Corporation, etc. are mentioned, for example. Although it does not specifically limit as said monomer, For example, polyfunctional acrylate etc. are mentioned. As said polyfunctional acrylate, the brand name "M-920" by the Toa Synthesis Co., Ltd. product etc. is mentioned, for example.

As for the optical film of this invention, the copolymer of curable urethane acrylate resin and polyfunctional acrylate may be sufficient as resin contained in the said functional layer (B), for example.

Moreover, for example, the said functional layer (B) contains a surface conditioning agent, and the element which comprises the said surface conditioning agent may contain the silicon. Moreover, the said surface conditioning agent may contain the silicon compound which has a dimethylsiloxane skeleton. The surface conditioning agent may be, for example, a leveling agent, a dimethylsiloxane-modified methacrylic acid ester, or a polydimethylsiloxane cyclic substance. As said surface conditioning agent, the brand name "LE-303" by Kyoeisha Chemical Co., Ltd. product, the brand name "PC4100" by DIC Corporation, etc. are mentioned. The addition amount of the said surface conditioning agent is not specifically limited.

The optical film of this invention WHEREIN: Although the said functional layer (B) is although it does not specifically limit, For example, as above-mentioned, a hard-coat layer may be sufficient, for example, an anti-glare hard-coat layer may be sufficient.

In the optical film of this invention, the said functional layer (B) is formed using the anti-glare hard-coat layer forming material containing resin and a filler, for example, The said functional layer (B) is the said filler You may have an aggregation part which forms a convex part on the surface of the said functional layer (B) by aggregation. Moreover, in the aggregation part which forms the said convex part WHEREIN: The said filler may exist in the state in which two or more gathered in one direction in the surface direction of the said functional layer (B). In the image display device of the present invention, the optical film of the present invention may be disposed so that, for example, one direction in which a plurality of the fillers are gathered and the long side direction of the black matrix pattern coincide. As said filler, the said particle|grains, the said thixotropy imparting agent, etc. are mentioned, for example.

The said functional layer (B) coats the coating liquid containing resin and a dilution solvent on the surface of the said light transmissive base material (A) so that it may mention later, for example to form a coating film, Then, the said coating film It is formed by removing the solvent from Examples of the resin include thermosetting resins and ionizing radiation curable resins cured with ultraviolet rays or light. As said resin, it is also possible to use a commercially available thermosetting resin, an ultraviolet curable resin, etc.

As the thermosetting resin or ultraviolet curable resin, for example, a curable compound having at least one of an acrylate group and a methacrylate group that is cured by heat, light (ultraviolet rays, etc.) or electron beam can be used, for example For example, acrylates and methacrylics of polyfunctional compounds such as silicone resins, polyester resins, polyether resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, polyhydric alcohols, etc. and oligomers or prepolymers such as late. These may be used individually by 1 type, and may use 2 or more types together.

For the said resin, for example, the reactive diluent which has at least one group among an acrylate group and a methacrylate group can also be used. As the reactive diluent, for example, the reactive diluent described in Japanese Patent Application Laid-Open No. 2008-88309 may be used, for example, monofunctional acrylate, monofunctional methacrylate, polyfunctional acrylate, polyfunctional methacrylic rate and the like. As said reactive diluent, trifunctional or more than trifunctional acrylate and trifunctional or more than trifunctional methacrylate are preferable. This is because the hardness of the functional layer (B) can be made excellent. As said reactive diluent, butanediol glycerol ether diacrylate, the acrylate of isocyanuric acid, the methacrylate of isocyanuric acid, etc. are mentioned, for example. These may be used individually by 1 type, and may use 2 or more types together.

The functional layer (B) may or may not contain a thixotropy imparting agent as described above. The thixotropy-imparting agent may be, for example, at least one selected from the group consisting of organoclay, oxidized polyolefin, and modified urea. Further, the thixotropy imparting agent may be, for example, a thickener. The said thixotropy imparting agent may be used individually by 1 type, and may use 2 or more types together.

In the optical film of the present invention, for example, 0.2 to 5 mass% or 0.4 to 4 mass% of the thixotropy-imparting agent is contained with respect to the total mass of the resin forming the functional layer of the functional layer (B). there may be

The optical film of this invention may have the structure in which another layer (C) was laminated|stacked on the surface on the opposite side to the said light transmissive base material (A) in the said functional layer (B), for example. You may stick the said other layer (C) on the said functional layer (B) with an adhesion layer, for example.

The said other layer (C) is not specifically limited, For example, a protective layer, a decorating layer, etc. may be sufficient. The other layer (C) may be, for example, glass or a resin film (plastic film). Although it does not specifically limit as said resin film, For example, Nitto Denko Co., Ltd. brand name "E-MASK" series etc. are mentioned. Although the thickness of the said other layer (C) is not specifically limited, For example, 10 micrometers or more, 20 micrometers or more, or 30 micrometers or more may be sufficient, For example, 80 micrometers or less, 70 micrometers or less, 60 micrometers or less, It may be 50 micrometers or less, or 40 micrometers or less may be sufficient.

The pressure-sensitive adhesive layer may be, for example, an adhesive layer formed of an adhesive (adhesive composition). In this invention, the said adhesion layer may be the layer which can peel again said other layer (C) from the said functional layer (B), for example. Although the thickness of the said adhesive layer is not specifically limited, For example, 5 micrometers or more, or 10 micrometers or more may be sufficient, for example, 50 micrometers or less, 40 micrometers or less, 30 micrometers or less, or 20 micrometers or less may be sufficient. Although the said adhesive is not specifically limited, For example, a (meth)acrylic-type polymer etc. are mentioned. These may be dissolved or dispersed in a solvent, for example, to be in the form of a solution or dispersion, and may be used as the pressure-sensitive adhesive (pressure-sensitive adhesive composition). As said solvent, ethyl acetate etc. are mentioned, for example, Only 1 type may be used and multiple types may be used together. The concentration of the solute or dispersoid (eg, the acrylic polymer) in the solution or dispersion may be, for example, 10% by mass or more, or 15% by mass or more, for example, 60% by mass or less, 50% by mass or less. % or less, 40 mass% or less, or 25 mass% or less may be sufficient. In addition, in this invention, "(meth)acrylic polymer" means the polymer or copolymer of at least 1 type of monomer among (meth)acrylic acid, (meth)acrylic acid ester, and (meth)acrylamide. In addition, in the present invention, (meth)acrylic acid means "at least one of acrylic acid and methacrylic acid", and "(meth)acrylic acid ester" means "at least one of acrylic acid ester and methacrylic acid ester" do. As said (meth)acrylic acid ester, linear or branched alkylester of (meth)acrylic acid, etc. are mentioned, for example. In the linear or branched alkyl ester of (meth)acrylic acid, the number of carbon atoms in the alkyl group may be, for example, 1 or more, 2 or more, 3 or more, or 4 or more, for example, 18 or less, 16 or less, 14 or more. or less, 12 or less, 10 or less, or 8 or less may be sufficient. The said alkyl group may be substituted by 1 or some substituent, for example, and may not be substituted. As for the said substituent, a hydroxyl group etc. are mentioned, for example, In the case of some, it may be same or different. Specific examples of the (meth)acrylic acid ester include 2-ethylhexyl acrylate, 2-hydroxyethyl acrylate, and 4-hydroxybutyl acrylate. Moreover, only 1 type may be used for the said adhesive, and may use multiple types together.

Moreover, the optical film of this invention may contain another layer other than the said light transmissive base material (A), the said functional layer (B), the said adhesion layer, and the said other layer (C), and does not need to contain it. . Although the said other layer is not specifically limited, For example, an easily bonding layer, an antireflection layer, the base material layer with an adhesive, etc. are mentioned.

[3. Manufacturing method of optical film]

The manufacturing method in particular of the optical film of this invention is not restrict|limited, Although it may manufacture by any method, an optical film can be manufactured as follows, for example.

First, the said functional layer (B) is formed on the said light transmissive base material (A) (functional layer (B) formation process). Thereby, the laminated body of the said light transmissive base material (A) and the said functional layer (B) is manufactured. The functional layer (B) forming step is, for example, the coating solution for forming the resin layer on the light transmissive substrate (A) (hereinafter simply referred to as “coating solution” or “functional layer (B) forming material”). There may be a case.), and the coating film formation process of drying the applied coating liquid and forming a coating film may be included. Moreover, for example, the said functional layer (B) formation process may contain the hardening process of hardening the said coating film further. The curing may be performed, for example, after drying, but is not limited thereto. The said hardening can be performed by heating, light irradiation, etc., for example. Although the said light is not specifically limited, For example, an ultraviolet-ray etc. may be sufficient. Although the light source of the said light irradiation is also not specifically limited, For example, a high pressure mercury lamp etc. may be sufficient.

The coating solution (material for forming the functional layer (B)) may be, for example, a coating solution containing the resin and the dilution solvent (hereinafter, simply referred to as “solvent”) as described above. . The said coating liquid may contain other components other than these, and does not need to contain it. Although it does not specifically limit as said other component, For example, the said particle|grains, the said thixotropy imparting agent, etc. are mentioned.

The said solvent in particular is not restrict|limited, A various solvent can be used and may be used individually by 1 type, and may use 2 or more types together. In order to obtain the optical film of this invention, according to the composition of the said resin, the kind, content, etc. of the said particle|grains and the said thixotropy-imparting agent, you may select an optimal solvent type and solvent ratio suitably. Although it does not specifically limit as a solvent, For example, Alcohol, such as methanol, ethanol, isopropyl alcohol (IPA), a butanol, t-butyl alcohol (TBA), 2-methoxyethanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclopentanone; esters such as methyl acetate, ethyl acetate, and butyl acetate; ethers such as diisopropyl ether and propylene glycol monomethyl ether; glycols such as ethylene glycol and propylene glycol; cellosolves such as ethyl cellosolve and butyl cellosolve; aliphatic hydrocarbons such as hexane, heptane, and octane; Aromatic hydrocarbons, such as benzene, toluene, and xylene, etc. are mentioned. Moreover, for example, the said solvent may contain the hydrocarbon solvent and the ketone solvent. The hydrocarbon solvent may be, for example, an aromatic hydrocarbon. The aromatic hydrocarbon may be, for example, at least one selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, and benzene. The ketone solvent may be, for example, at least one selected from the group consisting of cyclopentanone and acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, cyclohexanone, isophorone, and acetophenone. The solvent preferably contains the hydrocarbon solvent (eg toluene) for dissolving the thixotropy-imparting agent (eg, thickener). The solvent may be, for example, a solvent in which the hydrocarbon solvent and the ketone solvent are mixed in a mass ratio of 90:10 to 10:90. The mass ratio of the hydrocarbon solvent and the ketone solvent may be, for example, 80:20 to 20:80, 70:30 to 30:70, or 40:60 to 60:40. In this case, for example, the hydrocarbon solvent may be toluene and the ketone solvent may be methyl ethyl ketone. Moreover, while the said solvent contains toluene, for example, at least selected from the group which consists of ethyl acetate, butyl acetate, IPA, methyl isobutyl ketone, methyl ethyl ketone, methanol, ethanol, and TBA. One may be included.

As the light-transmitting base material (A), for example, when forming an intermediate layer (permeation layer) by employing an acrylic film, a good solvent for the acrylic film (acrylic resin) can be preferably used. The solvent may be, for example, a solvent containing a hydrocarbon solvent and a ketone solvent as described above. The hydrocarbon solvent may be, for example, an aromatic hydrocarbon. The aromatic hydrocarbon may be, for example, at least one selected from the group consisting of toluene, o-xylene, m-xylene, p-xylene, ethylbenzene, and benzene. The ketone solvent may be, for example, at least one selected from the group consisting of cyclopentanone, acetone, methyl ethyl ketone, methyl isobutyl ketone, diethyl ketone, cyclohexanone, isophorone, and acetophenone. The solvent may be, for example, a solvent in which the hydrocarbon solvent and the ketone solvent are mixed in a mass ratio of 90:10 to 10:90. The mass ratio of the hydrocarbon solvent and the ketone solvent may be, for example, 80:20 to 20:80, 70:30 to 30:70, or 40:60 to 60:40. In this case, for example, the hydrocarbon solvent may be toluene and the ketone solvent may be methyl ethyl ketone.

As the light-transmitting substrate (A), for example, when triacetyl cellulose (TAC) is used, the solvent is not particularly limited, and for example, ethyl acetate, methyl ethyl ketone, MIBK (methyl isobutyl ketone), cyclopentanone, etc. are mentioned, Only 1 type may be used and multiple types may be used together. In this case, the solvent may be, for example, a mixed solvent of MIBK and cyclopentanone. Although the mixing ratio of MIBK and cyclopentanone is not specifically limited, For example, in mass ratio, 90:10-10:90, 80:20-20:80, 70:30-30:70 may be sufficient.

Moreover, by selecting a solvent suitably, when it contains a thixotropy imparting agent, the thixotropy with respect to an anti-glare hard-coat layer forming material (coating liquid) can be expressed favorably. For example, when using organic clay, toluene and xylene can be preferably used alone or in combination. For example, when using polyolefin oxide, methyl ethyl ketone, ethyl acetate, propylene glycol monomethyl Ether can be preferably used alone or in combination. For example, when modified urea is used, butyl acetate and methyl isobutyl ketone can be preferably used alone or in combination.

Various leveling agents can be added to the said functional layer (B) forming material. As said leveling agent, for the purpose of coating nonuniformity prevention (homogenization of a coating surface), for example, a fluorine-type or silicone-type leveling agent can be used. A silicon-type leveling agent can be used also for the purpose of making the said functional layer (B) contain silicon as an element. In the present invention, when antifouling properties are required on the surface of the functional layer (B), or as the other layer (C), a layer containing an antireflection layer (low refractive index layer) or an interlayer filler is formed on the functional layer (B) Depending on the case and the like, a leveling agent can be appropriately selected.

The compounding quantity of the said leveling agent is 5 weight part or less with respect to 100 weight part of said resin, Preferably it is the range of 0.01-5 weight part.

A pigment, a filler, a dispersing agent, a plasticizer, a ultraviolet absorber, a surfactant, an antifouling agent, an antioxidant, etc. may be added to the said functional layer (B) forming material as needed in the range which does not impair performance. These additives may be used individually by 1 type, and may be used together 2 or more types.

A conventionally well-known photoinitiator as described in Unexamined-Japanese-Patent No. 2008-88309 can be used for the said functional layer (B) forming material, for example.

As a method of coating the said functional layer (B) forming material (coating liquid) on the said light transmissive base material (A) and forming a coating film, For example, the fountain coat method, the die coat method, the spray coat method, the gravure coat Coating methods, such as a method, a roll coat method, and a bar coat method, can be used.

Next, as described above, the coating film is dried and cured to form a functional layer (B). The drying may be, for example, natural drying, wind drying, heat drying, or a combination thereof.

The range of 30-200 degreeC may be sufficient as the drying temperature of the said functional layer (B) forming material (coating liquid), for example. The drying temperature may be, for example, 40 °C or higher, 50 °C or higher, 60 °C or higher, 70 °C or higher, 80 °C or higher, 90 °C or higher, or 100 °C or higher, 190 °C or lower, 180 °C or lower, 170 °C or lower Below, 160°C or lower, 150°C or lower, 140°C or lower, 135°C or lower, 130°C or lower, 120°C or lower, or 110°C or lower may be sufficient. The drying time is not particularly limited, and for example, may be 30 seconds or more, 40 seconds or more, 50 seconds or more, or 60 seconds or more, and may be 150 seconds or less, 130 seconds or less, 110 seconds or less, or 90 seconds or less.

Although the means in particular of hardening|curing means of the said coating film is not restrict|limited, Ultraviolet hardening is preferable. The irradiation amount of the energy ray source is preferably 50 to 500 mJ/cm 2 as an accumulated exposure amount at an ultraviolet wavelength of 365 nm. If an irradiation amount is 50 mJ/cm<2> or more, hardening will fully advance easily, and the hardness of the functional layer (B) formed will become high easily. Moreover, coloring of the functional layer (B) formed as it is 500 mJ/cm<2> or less can be prevented.

As mentioned above, the laminated body of the said light transmissive base material (A) and the said functional layer (B) can be manufactured. It is good also considering this laminated body as the optical film of this invention as it is, for example, on the surface on the opposite side to the said light transmissive base material (A) in the said functional layer (B), the said other layer with the said adhesion layer. (C) may be affixed and it is good also as the optical film of this invention.

[4. Manufacturing method of optical film winding body and quality inspection method of optical film winding body]

Next, the manufacturing method of the optical film winding object of this invention, and the quality inspection method of an optical film winding object are demonstrated more specifically, for example.

As mentioned above, the manufacturing method of the optical film wound body of this invention includes the winding process of winding an optical film and manufacturing the optical film winding body of this invention, In the said winding process, the said optical film winding body outermost layer In, the average value H _a of the plastic durometer hardness and the plastic durometer hardness H ₁ of the central point are characterized in that the optical film is wound so as to satisfy the above Equations (1) and (2).

The winding process is not particularly limited, and for example, the average value H _a of the plastic durometer hardness and the plastic durometer hardness H ₁ at the center point satisfy the above formulas (1) and (2). It may be the same as that of the manufacturing method of a general optical film winding object except winding up. Specifically, for example, while continuously sending out the long light-transmitting substrate (A), the functional layer (B) and, if necessary, the pressure-sensitive adhesive layer, the other layer (C), etc. are continuously formed. You may wind the said optical film so that the said Formula (1) and (2) may be satisfy|filled, manufacturing the optical film of this invention.

Moreover, the manufacturing method of the optical film winding object of this invention may include the quality inspection process of performing a quality inspection of the manufactured optical film winding object by the quality inspection method of the optical film winding object of this invention, for example. . The quality inspection method of the optical film winding body of the present invention is, as described above, as a quality inspection method of the optical film winding body, in the outermost layer of the optical film winding body, the average value H _a of the plastic durometer hardness and the center point It is characterized by confirming by measurement whether plastic durometer hardness H1 satisfies said Formula ( ₁ ) and (2). Moreover, in this invention, the measuring method of plastic durometer hardness is although it does not specifically limit as mentioned above, For example, it can measure by the measuring method prescribed|regulated to said JISK6253. In addition, the presence or absence of the dent of an optical film cannot be confirmed unless an optical film winding object is developed and visually observed. However, if it is confirmed by the measurement of the plastic durometer hardness that the above formula (2) |(H _a - H ₁ ) | can Moreover, the quality inspection method of the optical film winding object of this invention may test|inspect whether the manufactured optical film winding object satisfy|fills characteristics other than said Formula (1) and (2), for example. Specifically, for example, as described above, in the outermost layer of the optical film wound body, the plastic durometer hardness and the thickness of the optical film at the measuring point of the plastic durometer hardness are expressed by the formula ( 4) Whether or not the relation of is satisfied may be confirmed by measurement.

As described above, if the winding hardness of the optical film winding body (pressure or tension applied to the optical film) varies greatly depending on the place and the unevenness is large, for example, a foreign substance in the part with a large winding hardness (pressure is concentrated) When the back is curled up, there is a possibility that dents or scratches may occur. On the other hand, if the winding hardness of the optical film winding body is loosened in order to prevent the occurrence of dents and scratches (when the tension applied to the optical film is loosened), defects in the optical film (for example, wrinkles, etc.) occur due to winding misalignment. Therefore, there exists a possibility that it may become impossible to supply an optical film to the next process. The present inventors repeat studies to solve this problem, and the average value H _a of the plastic durometer hardness and the plastic durometer hardness H ₁ at the center point satisfy the above formulas (1) and (2) found out According to the present invention, as described above, even if the winding hardness is large and hard, the production of an optical film wound body, an optical film, an optical member, an image display device, an optical film wound body in which the occurrence of scratches and dents is suppressed or prevented, and It is possible to provide a quality inspection method of the optical film wound body.

Patent Document 1 also pays attention to the durometer hardness of the wound body of the thermoplastic resin film. However, in the invention described in Patent Document 1, the durometer hardness Hc of the central portion in the winding axial direction of the wound body, and the durometer hardness He of at least a portion within 30 mm from the end in the winding axial direction of the wound body, Hc + 3 < He It is characterized by being That is, the invention described in Patent Document 1 is characterized in that the durometer hardness of the end portion in the winding axial direction of the wound body is larger than the durometer hardness of the central portion in the winding axial direction of the wound body. In other words, invention described in patent document 1 does not make it a requirement that there are few nonuniformity of the plastic durometer hardness in the width direction of an optical film winding object like said Formula (2) of this invention. This is because, in patent document 1, since it is premised on winding the smooth film with small surface roughness, in order not to raise|generate a winding shift, it is because high tension is not required. On the other hand, the present inventors reduce the non-uniformity of the plastic durometer hardness in the width direction of the optical film wound body as in the above formula (2), and the plastic durometer hardness of the plastic durometer hardness as in the above formula (1). It discovered that the average value H _a was made into 40 N/m or more. Thereby, in this invention, even if it is an optical film which has an unevenness|corrugation on the surface, the defect (for example, wrinkles, etc.) of an optical film by winding shift is suppressed or prevented, and the generation|occurrence|production of a flaw and a dent is suppressed or prevented optical film winding body , an optical film, an optical member, an image display device, a manufacturing method of an optical film winding body, and a quality inspection method of an optical film winding body can be provided. However, the optical film of this invention is not limited to the optical film which has an unevenness|corrugation on the surface, The flat optical film which does not have unevenness|corrugation on the surface may be sufficient.

[5. optical member and image display device, etc.]

Although the optical member of this invention is not specifically limited, For example, a polarizing plate may be sufficient. The said polarizing plate is also although it does not specifically limit, For example, the optical film of this invention and a polarizer may be included, and also other component may be included. Each component of the said polarizing plate may be bonded together with an adhesive agent, an adhesive, etc., for example.

The image display apparatus of this invention is not specifically limited, either, Although any image display apparatus may be sufficient, For example, a liquid crystal display device, an organic electroluminescence display, etc. are mentioned.

The image display apparatus of this invention is an image display apparatus which has the optical film of this invention on the visual recognition side surface, for example, The said image display apparatus may have a black matrix pattern.

The optical film of this invention can bond the said light transmissive base material (A) side to the optical member used for 11D via an adhesive or an adhesive agent, for example. In addition, this bonding WHEREIN: You may give various surface treatment as mentioned above with respect to the said light transmissive base material (A) surface. As mentioned above, according to the manufacturing method of the optical film of this invention, the surface shape of an optical film is freely controllable in a wide range. For this reason, the optical characteristic obtained by laminating|stacking the said optical film with another optical member using an adhesive agent, an adhesive, etc. spans the wide range corresponding to the surface shape of the said optical film.

As said optical member, a polarizer or a polarizing plate is mentioned, for example. A polarizing plate generally has a structure in which it has a transparent protective film on one side or both sides of a polarizer. When forming a transparent protective film on both surfaces of a polarizer, the same material may be sufficient as the front and back transparent protective film, and different materials may be sufficient as it. A polarizing plate is normally arrange|positioned on both sides of a liquid crystal cell. Moreover, a polarizing plate is arrange|positioned so that the absorption axis of two polarizing plates may mutually be substantially orthogonal.

The configuration of the polarizing plate on which the optical film is laminated is not particularly limited, but for example, a configuration in which a transparent protective film, the polarizer and the transparent protective film are laminated in this order on the optical film may be used, and on the optical film The structure in which the said polarizer and the said transparent protective film were laminated|stacked in this order may be sufficient.

The image display apparatus of this invention has the structure similar to the conventional image display apparatus except arrange|positioning the said optical film in a specific direction. For example, in the case of LCD, optical members, such as a liquid crystal cell and a polarizing plate, and each component, such as an illumination system (backlight etc.) as needed, can be manufactured by assembling suitably, and mounting a drive circuit.

The use of the optical film of this invention is not specifically limited, It can be used for arbitrary uses. Examples of such uses include OA devices such as PC monitors, notebook computers, and photocopiers, mobile phones, watches, digital cameras, portable information terminals (PDAs), portable devices such as portable game machines, video cameras, televisions, and microwave ovens. Home electrical equipment such as, back monitor, car navigation system monitor, car audio equipment, etc., display equipment such as information monitor for commercial stores, security equipment such as monitoring monitor, nursing care monitor, medical monitor, etc. -Medical equipment etc. are mentioned.

Example

Next, Examples of the present invention will be described together with Comparative Examples. However, the present invention is not limited by the following Examples and Comparative Examples.

In addition, in the following examples and comparative examples, the number of parts of a substance is a mass part (weight part) unless otherwise indicated.

[Examples 1 to 7 and Comparative Examples 1 to 2]

The optical film wound bodies of Examples 1-7 and Comparative Examples 1-2 were manufactured as follows. As an optical film used as a raw material of an optical film winding object, the following optical film was used for any of Examples 1-7 and Comparative Examples 1-2.

The optical film wound body of Examples 1 to 7 and Comparative Examples 1 to 2 variously changed the width W [m] and the length L [m] of the optical film as shown in Table 1 below, and also plastic durometer hardness was prepared with various changes as shown in Table 1 below. In Table 1 below, the "average value [H _a ]" of the "winding body durometer hardness [H]" is the average value H _a [ N/m]. "|(H _a - H ₁ ) |/H _a ≤ 0.1" represents |(H _a - H ₁ ) |/H _a in the above formula (2). W represents the width [m] of the optical film. "Amount of plastic deformation" represents the amount of plastic deformation [nm] when an optical film is press-fitted by the nanoindentation method. "Elastic recovery factor" shows the elastic recovery factor [%] when an optical film is press-fitted by the nanoindentation method. L represents the length [m] of the optical film. D represents the average value D _a [micrometer] of the said optical film thickness in said Formula (4). "Number of dents" shows how many dents per 1 m 2 were caused by foreign matter when the entire optical film surface obtained by developing an optical film wound body was visually observed. In addition, the optical film in which dents due to foreign matter were 10 or less per 1 m 2 were judged as good products, and optical films in which dents due to foreign substances were more than 10 per m 2 were judged to be defective.

Plastic durometer hardness was measured by the method of JISK6253. The winding shift amount of the optical film winding body, the number of dents of the optical film, the amount of plastic deformation, the elastic recovery factor, and the thickness were respectively measured by the following method.

[Measurement of winding deviation]

It demonstrates using FIG. 4 . With respect to the winding core 110 used for the winding of the optical film winding body 100, the optical film which comprises the optical film winding object 100 is the most advanced position with respect to the winding axis|shaft 100a (100b) drew On the other hand, the perpendicular line 100c was drawn with respect to the winding-up axis|shaft 100a at the position where the said optical film has retreated most with respect to the winding-up core 110. As shown in FIG. The distance X from the perpendicular 100b to the perpendicular 100c was defined as the amount of winding deviation.

[Count (count) of the number of dents in the optical film]

The manufactured optical film winding body is disassembled, the optical film (L ₀ ) of the part in the most surface layer, the optical film (L _1/2 ) at the intermediate position of the number of turns, and the optical film (L) on the side closest to the winding core were sampled so that the total area was 1 m 2 , respectively. The dent was counted (counted) while reflecting light on the film at a position at which the light source was 45° with respect to the film using a three-wavelength fluorescent lamp as a light source for an optical film of a total size of 3 m 2 . It was determined as x, (triangle|delta) or (circle) by the following reference|standard, and what was determined with x was counted as the number of dents. And the average (L0+L1/ ₂ +L)/3 of the _number of counts was made into the number of dents [piece/m<2>] of each Example, and it was set as the evaluation result.

x: The deformation|transformation of reflected light is visually recognized.

(triangle|delta): A slight deformation|transformation is visually recognized, but it is permissible range.

(circle): The deformation|transformation of reflected light is not visually recognized.

[Measuring method of plastic durometer hardness of wound body]

As mentioned above, plastic durometer hardness was measured by the method of JISK6253. The center point of the width direction in the opposite side to the front-end|tip of the said optical film winding body was made into h1, and the plastic durometer hardness measured in h1 was made into H1 _[ N/ _{m ]} . The point having a distance of 10 mm from one end in the width direction was defined as h ₂₁ , and the plastic durometer hardness measured at h ₂₁ was defined as H ₂₁ [N/m]. The point where the distance from one end in the width direction was W/4 was h ₁₁ , and the plastic durometer hardness measured at h ₁₁ was H ₁₁ [N/m]. The point having a distance of 10 mm from the other end in the width direction was defined as h ₂₂ , and the plastic durometer hardness measured at h ₂₂ was defined as H ₂₂ [N/m]. The point where the distance from the other end in the width direction was W/4 was h ₁₂ , and the plastic durometer hardness measured at h ₁₂ was H ₁₂ [N/m]. The average value [N/m] of the plastic durometer hardness H ₁ , H ₂₁ , H ₁₁ , H ₂₂ , H ₁₂ at 5 points of h ₁ , h ₂₁ , h ₁₁ , h ₂₂ , h ₁₂ was calculated as H _a [N /m]. However, W is the width [m] of the said optical film in the opposite side to the front-end|tip of the winding-up completion of the said optical film winding body.

[Method for measuring plastic deformation and elastic recovery rate using nano indenter]

The optical film of each Example and Comparative Example as a measurement sample was cut out to about 1 cm in width and length, and it was fixed to the predetermined support body of the following apparatus, and nanoindentation measurement was performed.

Device: HysitroN INc. Manufactured, trade name "TriboiNdeNter"

Indenter used: BerkovicH (triangular pyramid)

Measurement method: single indentation measurement

Indentation depth: 500 nm

When the indenter was press-fitted under the above conditions, the maximum amount of displacement (H _max ) was measured, and after unloading continuously, the amount of plastic deformation ( _HF ) was measured. After the indenter was press-fitted to the indentation depth of 500 nm under the above conditions, it was unloaded, the distance from the sample plane after unloading to the pressing part at the tip of the indenter was measured, and the distance was defined as the amount of plastic deformation. From the obtained maximum displacement H _max [nm] and plastic deformation amount H _F [nm], the elastic recovery factor was calculated according to the following formula.

Elastic recovery factor (%) = [(H _max - H _F )/H _max ] × 100

[Examples 1 to 7, Comparative Examples 1 to 2]

The hard-coat layer forming material was manufactured as follows, the hard-coat film (optical film) was manufactured using it further, the hard-coat film was wound further, and the optical film winding body was manufactured.

[Example 1]

(Manufacture of hard-coat layer forming material)

As a resin contained in the hard coat layer forming material, 45 parts by weight of an ultraviolet curable urethane acrylate resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA53H-80MB", solid content 80%), and pentaerythritol triacrylate as main components 55 parts by weight of a polyfunctional acrylate as Per 100 parts by weight of the resin solid content of the resin, 3 parts by weight of a photopolymerization initiator (manufactured by BASF, trade name "OMNIRAD907") and 0.05 parts by weight of a leveling agent (manufactured by DIC Corporation, trade name "GRANDIC PC4100", solid content 10%) are mixed did. This mixture was diluted with MIBK/butyl acetate mixed solvent (weight ratio 50/50) so that solid content concentration might be 40%, and the hard-coat layer forming material (coating liquid, anti-glare hard-coat layer (B) forming material) was manufactured. .

(Manufacture of hard coat film and optical film wound body)

As the light-transmitting substrate (A), a transparent plastic film substrate (acrylic film, manufactured by Toyo Steel Co., Ltd., trade name “HX40UF”, thickness: 40 µm, film width: 1300 mm) was prepared. On one side of the transparent plastic film substrate (light transmissive substrate (A)), the anti-glare hard coat layer (B) forming material (coating solution) was continuously applied (coating) for 3000 m using a die coater, A coating film was formed (coating process). And this undried transparent plastic film base material on which the coating film was formed was conveyed at the speed|rate of 30 m/sec in the following drying process (coating film formation process). In the drying process (coating-film formation process), the said undried coating film was dried by heating at 100 degreeC for 1 minute, and the coating film was formed. Then, the total film thickness was 46 micrometers by irradiating the ultraviolet-ray of 300 mJ/cm<2> of accumulated light quantity with a high-pressure mercury lamp, curing the said coating film, and forming the hard-coat layer of thickness (maximum thickness) 6.0 micrometers. In this way, the hard coat film (optical film) was manufactured.

Moreover, conveying the hard coat film (optical film) in which the said continuous application|coating was completed as it is, it wound up by 200N setting of winding tension|tensile_strength, and the objective optical film winding body was manufactured. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 69 N/m, H ₁₁ = 73 N/m, H ₁ = 72 N/m, H ₁₂ = 72 N/m , H ₂₂ = 76 N/m. That is, as a representative (average) value, it was 72 N/m, and the amount of deviation was 1 %. Moreover, the plastic deformation amount in the sheet state of the manufactured hard coat film was 75.9 micrometers, and the elastic recovery factor was 88.4 %. According to the above-mentioned method, as a result of confirming the amount of winding deviation, it was 0 mm, and as a result of counting the number of dents, it was 0 pieces/m<2>. These results are put together and shown in Table 1.

[Example 2]

As a resin contained in the hard coat layer forming material, 40 parts by weight of an ultraviolet curable urethane acrylate resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA53H-80MB", solid content 80%), and pentaerythritol triacrylate as main components 60 parts by weight of a polyfunctional acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name “Viscoat #300”, solid content 100%), and a film that has been continuously coated with a winding tension of 230 N was wound. Except that, the hard-coat layer forming material, the hard-coat film (optical film), and the optical film winding body were manufactured by the method similar to Example 1. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 76 N/m, H ₁₁ = 78 N/m, H ₁ = 74 N/m, H ₁₂ = 75 N/m , H ₂₂ = 77 N/m. That is, as a representative (average) value, it was 76 N/m, and the amount of deviation was 3 %. Moreover, the plastic deformation amount in the sheet state of the manufactured hard coat film was 79.5 micrometers, and the elastic recovery factor was 85.4 %. According to the above-mentioned method, as a result of confirming the amount of winding deviation, it was 0 mm, and as a result of counting the number of dents, it was 1 piece/m<2>. These results are put together and shown in Table 1.

[Example 3]

As a resin contained in the hard coat layer forming material, 30 parts by weight of an ultraviolet curable urethane acrylate resin (manufactured by Shin-Nakamura Chemical Co., Ltd., trade name "UA53H-80MB", solid content 80%), and pentaerythritol triacrylate as main components A polyfunctional acrylate (manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name "Viscoat #300", solid content 100%) of 70 parts by weight, and a film that has been continuously coated with a winding tension of 200 N was wound. Except that, the hard-coat layer forming material, the hard-coat film (optical film), and the optical film winding body were manufactured by the method similar to Example 1. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 65 N/m, H ₁₁ = 68 N/m, H ₁ = 73 N/m, H ₁₂ = 71 N/m , H ₂₂ = 70 N/m. That is, as a representative (average) value, it was 69 N/m, and the amount of deviation was 5 %. Moreover, the plastic deformation amount in the sheet state of the manufactured hard coat film was 86.2 micrometers, and the elastic recovery factor was 78.4 %. According to the above-mentioned method, as a result of confirming the amount of winding deviation, it was 0 mm, and as a result of counting the number of dents, it was 3 pieces/m<2>. These results are put together and shown in Table 1.

[Example 4]

As the light-transmitting substrate (A), a transparent plastic film substrate (acrylic film, manufactured by Toyo Steel Co., Ltd., trade name “HX40UF”, thickness: 40 µm, film width: 300 mm) was prepared, and the anti-glare hard coat layer (B) A hard coat was carried out in the same manner as described in Example 2, except that the forming material (coating solution) was continuously coated (coated) for 6500 m using a die coater, and the tension at the time of winding was set to 60 N. A layer-forming material, a hard coat film (optical film) and an optical film wound body were prepared. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 74 N/m, H ₁₁ = 68 N/m, H ₁ = 72 N/m, H ₁₂ = 75 N/m , H ₂₂ = 69 N/m. That is, as a representative (average) value, it was 72 N/m, and the amount of deviation was 5 %. According to the method mentioned above, as a result of confirming the amount of winding deviation, it was 2 mm, and as a result of counting the number of dents, it was 1 piece/m<2>. These results are put together and shown in Table 1.

[Example 5]

As the light-transmitting substrate (A), a transparent plastic film substrate (acrylic film, manufactured by Toyo Steel Co., Ltd., trade name “HX40UF”, thickness: 40 µm, film width: 2500 mm) was prepared, and the anti-glare hard coat layer (B) A hard coat was carried out in the same manner as described in Example 2, except that the forming material (coating solution) was continuously coated (coated) for 50 m using a die coater, and the tension at the time of winding was set to 400 N. A layer-forming material, a hard coat film (optical film) and an optical film wound body were prepared. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 77 N/m, H ₁₁ = 78 N/m, H ₁ = 78 N/m, H ₁₂ = 80 N/m , H ₂₂ =79 N/m. That is, as a representative (average) value, it was 78 N/m, and the amount of deviation was 1 %. According to the above-mentioned method, as a result of confirming the amount of winding deviation, it was 0 mm, and as a result of counting the number of dents, it was 0 pieces/m<2>. These results are put together and shown in Table 1.

[Example 6]

As the light-transmitting substrate (A), a transparent plastic film substrate (PET film, manufactured by Toray Co., Ltd., trade name “Lumiror”, thickness: 188 µm, film width: 1300 mm) was prepared, and the anti-glare hard coat layer ( B) Hard coat layer in the same manner as described in Example 2, except that the forming material (coating solution) was continuously coated (coated) for 2000 m using a die coater, and the tension at the time of winding was 400 N. A forming material, a hard coat film (optical film), and an optical film wound body were prepared. As a result of measuring the plastic durometer hardness of the optical film wound body produced in this way, H ₂₁ = 44 N/m, H ₁₁ = 47 N/m, H ₁ = 43 N/m, H ₁₂ = 44 N/m , H ₂₂ = 48 N/m. That is, as a representative (average) value, it was 45 N/m, and the amount of deviation was 5 %. According to the method mentioned above, as a result of confirming the amount of winding deviation, it was 4 mm, and as a result of counting the number of dents, it was 0 pieces/m<2>. These results are put together and shown in Table 1.

[Example 7]

As the light-transmitting substrate (A), a transparent plastic film substrate (COP film, manufactured by Nippon Zeon Co., Ltd., trade name “ZF series”, thickness: 13 µm, film width: 1300 mm) was prepared, and the anti-glare hard coat layer (B) A hard coat was carried out in the same manner as described in Example 2, except that the forming material (coating solution) was continuously applied (coated) for 3000 m using a die coater, and the tension at the time of winding was set to 200 N. A layer-forming material, a hard coat film (optical film) and an optical film wound body were prepared. As a result of measuring the plastic durometer hardness of the optical film wound body produced in this way, H ₂₁ = 87 N/m, H ₁₁ = 88 N/m, H ₁ = 91 N/m, H ₁₂ = 94 N/m , H ₂₂ = 89 N/m. That is, as a representative (average) value, it was 90 N/m, and the amount of deviation was 1 %. According to the above-mentioned method, as a result of confirming the amount of winding deviation, it was 0 mm, and as a result of counting the number of dents, it was 3 pieces/m<2>. These results are put together and shown in Table 1.

[Comparative Example 1]

A hard coat layer forming material, a hard coat film (optical film), and an optical film wound body were prepared in the same manner as in Example 1, except that the continuous coating film was wound with a winding tension of 70 N setting. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 31 N/m, H ₁₁ = 28 N/m, H ₁ = 29 N/m, H ₁₂ = 32 N/m , H ₂₂ = 28 N/m. That is, as a representative (average) value, it was 30 N/m, and the amount of deviation was 2 %. According to the method mentioned above, as a result of confirming the amount of winding deviation, it was 10 mm, and as a result of counting the number of dents, it was 0 pieces/m<2>. These results are put together and shown in Table 1.

[Comparative Example 2]

A hard coat layer forming material, a hard coat film (optical film), and an optical film wound body were manufactured in the same manner as in Example 1, except that the winding tension was set at 300 N and continuous application was performed at a speed of 10 m/min. As a result of measuring the plastic durometer hardness of the optical film wound body manufactured in this way, H ₂₁ = 72 N/m, H ₁₁ = 58 N/m, H ₁ = 58 N/m, H ₁₂ = 65 N/m , H ₂₂ = 72 N/m. That is, as a representative (average) value, it was 65 N/m, and the amount of deviation was about 11 %. According to the above-mentioned method, as a result of confirming the amount of winding deviation, it was 0 mm, and as a result of counting the number of dents, it was 40 pieces/m<2>. These results are put together and shown in Table 1.

As shown in Table 1, the optical film wound bodies of Examples 1-7 all had very small winding shift|offset|difference, and there were very few dents due to a foreign material. On the other hand, in Comparative Example 1, the average value H _a [N/m] of the plastic durometer hardness in the formula (1) is 30 N/m (that is, less than 40 N/m), that is, the winding is loose. And, as a result, compared with an Example, the winding shift was large. In Comparative Example 2, |(H _a - H ₁ ) |/H _a in the formula (2) is about 11% (that is, 0.11, which is more than 0.1), and the plastic durometer hardness variation was large, and as a result, compared with the Example, there were very many dents due to foreign matter.

As described above, according to the present invention, even if the winding hardness is large and hard, the production of an optical film wound body, an optical film, an optical member, an image display device, and an optical film wound body in which the occurrence of scratches and dents is suppressed or prevented And it may provide a quality inspection method of the optical film wound body. Although this invention is suitable especially for the optical film which has an unevenness|corrugation on the surface, it is not limited to this, It is applicable to all optical films. Therefore, the optical member of this invention, an image display apparatus, etc. are not specifically limited, either, The present invention is applicable to all optical members, an image display apparatus, etc.

This application claims the priority on the basis of Japanese Patent Application No. 2021-004741 for which it applied on January 15, 2021, and takes in all the indication here.

10: optical film
11: light transmissive substrate (A)
12: functional layer (B)
12a: functional layer forming resin
12b: particle
12c: thixotropy imparting agent
100: optical film wound body
100A: Position of the winding end tip of the winding object 100 in the outermost layer of the winding object 100
100B: a position on the opposite side of the winding end tip 100A of the winding object 100 in the outermost layer of the winding object 100
100a: winding axis
100b, 100c: perpendicular to the winding axis 100a
110: winding seam
h ₁ , h ₁₁ , h ₁₂ , h ₂₁ , h ₂₂ : measuring point of plastic durometer hardness
H ₁ , H ₁₁ , H ₁₂ , H ₂₁ , H ₂₂ : plastic durometer hardness

Claims (12)

As a wound body of an optical film,
In the outermost layer of the optical film wound body, the average value H _a of the plastic durometer hardness, and the plastic durometer hardness H ₁ of the central point, the following formulas (1) and (2) are satisfied. body.

In the above formulas (1) and (2),
H ₁ is the plastic durometer hardness [N/m] at the center point in the width direction on the opposite side to the end of the winding end of the optical film wound body in the outermost layer of the optical film wound body,
H _a is a point having a distance from one end of 10 mm, a distance from one end of W/4, a central point, and the other end in the width direction on the opposite side to the end of the winding end of the optical film wound body. It is an average value [N/m] of plastic durometer hardness in 5 points|pieces of the point whose distance is W/4, and the point whose distance from the said other end is 10 mm. However, W is the width [m] of the said optical film in the opposite side to the front-end|tip of the winding-up completion of the said optical film winding body. The method of claim 1,
The optical film wound body whose plastic deformation amount is 85 Nm or less when the said optical film press-fits by the nanoindentation method, and is an optical film whose elastic recovery factor is 80 % or more. The method of claim 1,
The optical film winding body with which the relationship between the width|variety and length of the said optical film satisfy|fills following formula (3).

In the above formula (3),
W is the width [m] of the optical film,
L is the length [m] of the said optical film. The method of claim 1,
In the outermost layer of the optical film wound body, the plastic durometer hardness and the thickness of the optical film at the measuring point of the plastic durometer hardness satisfy the relationship of the following formula (4).

In the above formula (4),
H _a is a point having a distance from one end of 10 mm, a distance from one end of W/4, a central point, and the other end in the width direction on the opposite side to the end of the winding end of the optical film wound body. It is an average value [N/m] of plastic durometer hardness in 5 points|pieces of the point whose distance is W/4, and the point whose distance from the said other end is 10 mm. However, W is the width [m] of the said optical film in the opposite side to the front-end|tip of the winding-up completion of the said optical film winding body.
D _a is the average value [micrometer] of the said optical film thickness in the said 5 points|pieces which are the measuring points of the said plastic durometer hardness. The method of claim 1,
The optical film winding body whose said optical film is an optical film which has an unevenness|corrugation on the surface. The method of claim 1,
The optical film wound body whose said optical film is an anti-glare film. The method of claim 1,
The optical film winding body whose said optical film is a hard-coat film. The method of claim 1,
The optical film wound body whose said optical film is an anti-glare hard-coat film. The optical film obtained by developing the optical film winding body in any one of Claims 1-8. The optical member containing the optical film of Claim 9. 11. The method of claim 10,
An optical member that is a polarizing plate. The image display apparatus containing the optical film of Claim 9, or the optical member containing the optical film of Claim 9.

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