JP2012087174A5

JP2012087174A5 -

Info

Publication number: JP2012087174A5
Application number: JP2010232842A
Authority: JP
Filing date: 2010-10-15
Publication date: 2013-02-28
Anticipated expiration: 2030-10-15

Description

前記粘着型光学フィルムとしては、偏光子の少なくとも片面に透明保護フィルムを設け
た偏光板の片面に前記光学用粘着剤層を積層した粘着型偏光板が挙げられ、当該粘着型偏
光板は、偏光板の偏光度（Ｐ１）と粘着型偏光板の偏光度（Ｐ２）との差（Ｐ１−Ｐ２）
で表される偏光解消性値が、０．０１５以下を満足することが好ましい。 Examples of the adhesive optical film include an adhesive polarizing plate in which the optical adhesive layer is laminated on one side of a polarizing plate provided with a transparent protective film on at least one side of a polarizer. Difference between the degree of polarization (P1) of the plate and the degree of polarization (P2) of the adhesive polarizing plate ( P1-P2 )
It is preferable that the depolarization value represented by this satisfies 0.015 or less.

上記のように、本発明の光学用粘着剤層は、偏光解消性値が小さい。例えば、偏光板の
片面に前記光学用粘着剤層を積層した粘着型偏光板において、偏光板の偏光度（Ｐ１）と
粘着型偏光板の偏光度（Ｐ２）との差（Ｐ１−Ｐ２）を偏光解消性値と定義した場合、当
該偏光解消性値は０．０１５以下と小さい値に制御することができる。偏光解消性値は小
さいほど好ましく、０．０１２以下がより好ましく、さらには、０．０１０以下が好まし
い。例えば、前記乾燥温度を満足することにより、偏光解消性値を０．０１０以下にする
ことが可能である。なお、偏光解消性値に係る偏光度の測定は、実施例の記載に基づいて
行なわれ、偏光板の種類によらずに、同様の偏光解消性値を得ることができる。偏光解消
性値の測定に用いられる偏光板の偏光度は９９．０００以上が好ましく、さらには９９．
９００以上であるのが好ましい、さらには９９．９９５以上であるのが好ましい。 As described above, the optical pressure-sensitive adhesive layer of the present invention has a small depolarization value. For example, in the pressure-sensitive adhesive polarizing plate in which the optical pressure-sensitive adhesive layer is laminated on one surface of the polarizing plate, the difference ( P1−P2 ) between the polarization degree (P1) of the polarizing plate and the polarization degree (P2) of the pressure-sensitive adhesive polarizing plate is obtained. When the depolarization value is defined, the depolarization value can be controlled to a small value of 0.015 or less. The smaller the depolarization value, the more preferable, 0.012 or less is more preferable, and 0.010 or less is more preferable. For example, by satisfying the drying temperature, the depolarization value can be made 0.010 or less. In addition, the measurement of the polarization degree which concerns on a depolarization value is performed based on description of an Example, and the same depolarization value can be obtained irrespective of the kind of polarizing plate. The polarization degree of the polarizing plate used for the measurement of the depolarization value is preferably 99.000 or more, more preferably 99.000.
It is preferably 900 or more, more preferably 99.995 or more.

＜偏光解消性値＞
偏光板および粘着型偏光板の偏光度を、積分球付き分光光度計（日本分光株式会社製の
Ｖ７１００）を用いて測定した。なお、偏光度は、偏光板または粘着型偏光板の透過軸を
、プリズムからの偏光の振動面に直交する方向に設置して測定した最小透過率（Ｋ２)と
、偏光板または粘着型偏光板を９０度回転させて測定した最大透過率（Ｋ１)を以下の式
に適用することにより求められるものである。
偏光度（％）＝｛（Ｋ２−Ｋ１）／（Ｋ２＋Ｋ１）｝×１００
各透過率は、グランテラープリズム偏光子を通して得られた完全偏光を１００％として、
ＪＩＳＺ８７０１の２度視野（Ｃ光源）により視感度補整したＹ値で示したものである
。上記で測定した偏光板の偏光度（Ｐ１）および粘着型偏光板の偏光度（Ｐ２）の測定結
果から差（Ｐ１−Ｐ２）を算出して、偏光解消性値を導いた。 <Depolarization value>
The polarization degree of the polarizing plate and the adhesive polarizing plate was measured using a spectrophotometer with an integrating sphere (V7100 manufactured by JASCO Corporation). The degree of polarization is the minimum transmittance (K2) measured by setting the transmission axis of the polarizing plate or the adhesive polarizing plate in a direction perpendicular to the plane of vibration of the polarized light from the prism, and the polarizing plate or the adhesive polarizing plate. Is obtained by applying the maximum transmittance (K1) measured by rotating 90 degrees to the following equation.
Polarization degree (%) = {(K2−K1) / (K2 + K1)} × 100
Each transmittance is 100% of the completely polarized light obtained through the Grandteller prism polarizer.
This is indicated by a Y value obtained by correcting the visibility with a two-degree field of view (C light source) of JIS Z8701. The difference ( P1-P2 ) was calculated from the measurement results of the polarization degree (P1) of the polarizing plate measured above and the polarization degree (P2) of the pressure-sensitive adhesive polarizing plate, and a depolarization value was derived.

Claims

The pressure-sensitive adhesive optical film is a pressure-sensitive adhesive polarizing plate in which the optical pressure-sensitive adhesive layer is laminated on one surface of a polarizing plate provided with a transparent protective film on at least one surface of a polarizer,
The depolarization value represented by the difference ( P1-P2 ) between the degree of polarization (P1) of the polarizing plate and the degree of polarization (P2) of the adhesive polarizing plate satisfies 0.015 or less. Item 13. The pressure-sensitive adhesive optical film according to Item 12.