Polarizing film laminate comprising a long polarizing having exposed portion where a polarizer is exposed

Patent metadata

Field	Value
Publication number	US-10215900-B2
Application number	US-201515321875-A
Country	US
Kind code	B2
Filing date	Jun 26, 2015
Priority date	Jun 27, 2014
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A long polarizing film laminate capable of producing a polarizer that can achieve the multi-functionalization and high-functionalization of an electronic device, such as an image display apparatus, that shows no variation in quality when provided as a final product, and that is excellent in yield in its production. A polarizing film laminate according to an embodiment of the present invention includes: a long polarizer; and a surface protective film arranged on one surface side of the polarizer. The polarizing film laminate has, on the one surface side, exposed portions where the polarizer is exposed. The exposed portions are arranged in a lengthwise direction and/or a widthwise direction of the polarizer at predetermined intervals.

First claim

The invention claimed is:

1. A polarizing film laminate, comprising:
a long polarizer; and
a surface protective film arranged on one surface side of the polarizer,
the polarizing film laminate having, on the one surface side, exposed portions where the polarizer is exposed,
the exposed portions being arranged in at least one of a lengthwise direction or a widthwise direction of the polarizer at predetermined intervals, and
wherein when the polarizer is cut into a predetermined size to be mounted on an image display apparatus having a predetermined size, the exposed portions are each arranged at a position corresponding to a camera portion of the image display apparatus.

2. The polarizing film laminate according to claim 1 , wherein the exposed portions are arranged in the lengthwise direction at predetermined intervals.

3. The polarizing film laminate according to claim 2 , wherein the exposed portions are arranged in at least the lengthwise direction at substantially equal intervals.

4. The polarizing film laminate according to claim 3 , wherein the exposed portions are arranged in the lengthwise direction and the widthwise direction of the polarizer at substantially equal intervals.

5. The polarizing film laminate according to claim 1 , wherein a direction of a straight line connecting the exposed portions adjacent to each other falls within a range of ±10° with respect to the at least one of the lengthwise direction or the widthwise direction of the polarizer.

6. The polarizing film laminate according to claim 1 , wherein the polarizer has a thickness of 10 μm or less.

7. The polarizing film laminate according to claim 1 , wherein portions of the polarizer corresponding to the exposed portions each have a polarization degree of 99.9% or more.

8. The polarizing film laminate according to claim 7 , wherein the polarizing film laminate is subjected to a step of decoloring the portions of the polarizer corresponding to the exposed portions while being conveyed in the lengthwise direction.

9. The polarizing film laminate according claim 1 , wherein portions of the polarizer corresponding to the exposed portions comprise non-polarization portions formed by decoloring the polarizer.

10. The polarizing film laminate according to claim 9 , wherein the non-polarization portions each have a transmittance of 90% or more.

11. The polarizing film laminate according to claim 9 , wherein the portions of the polarizer corresponding to the exposed portions each include a recessed portion having a recessed surface on the one surface side of the polarizer.

12. The polarizing film laminate according to claim 9 , wherein the non-polarization portions comprise low concentration portions each having a content of a dichromatic substance lower than that of any other portion.

13. The polarizing film laminate according to claim 12 , wherein a content of at least one of an alkali metal or an alkaline earth metal in each of the low concentration portions is 3.6 wt % or less.

14. The polarizing film laminate according to claim 12 , wherein the low concentration portions are formed by bringing a basic solution into contact with the polarizer.

15. The polarizing film laminate according to claim 14 , wherein the basic solution comprises an aqueous solution containing at least one of a hydroxide of an alkali metal or an alkaline earth metal.

16. The polarizing film laminate according to claim 1 , wherein the surface protective film has formed therein through-holes, and portions corresponding to the through-holes comprise the exposed portions.

17. The polarizing film laminate according to claim 1 , wherein the surface protective film is laminated on the polarizer in a peelable manner.

18. The polarizing film laminate according to claim 1 , further comprising a protective film arranged on another surface side of the polarizer.

19. The polarizing film laminate according to claim 18 , wherein the protective film has a thickness of 80 μm or less.

20. The polarizing film laminate according to claim 1 , further comprising a second surface protective film arranged on another surface side of the polarizer.

21. The polarizing film laminate according to claim 1 , wherein the exposed portions are arranged in a dotted manner.

22. The polarizing film laminate according to claim 1 , wherein a plan-view shape of each of the exposed portions comprises a substantially circular shape or a substantially rectangular shape.

23. The polarizing film laminate according to claim 1 , wherein the polarizing film laminate is wound in a roll shape.

24. The polarizing film laminate according to claim 1 , wherein the polarizing film laminate is used for producing a plurality of polarizers each having a non-polarization portion.

Assignees

• Nitto Denko Corp

Inventors

• Yaegashi Masahiro
• Ogomi Daisuke
• Nakano Yuki
• Saiki Yuji
• Nakai Kota

Classifications

• G02F2201/50

  Protective arrangements · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B27/306

  comprising vinyl acetate or vinyl alcohol (co)polymers · CPC title

• G02B5/3033 Primary

  in the form of a thin sheet or foil, e.g. Polaroid · CPC title

• B32B2255/26

  Polymeric coating · CPC title