FILM FOR DISPLAY, POLARIZING PLATE AND MANUFACTURING METHOD THEREOF, AND LIQUID CRYSTAL DISPLAY

Abstract

A film for a display comprising a cellulose ester and a compound represented by Formula (I) or (Ia).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic flow sheet to show an embodiment to practice a manufacturing method of cellulose ester film according to the present invention.

FIG. 2 is an enlarged flow sheet of a primary portion of the manufacturing apparatus of FIG. 1.

FIG. 3( a) is an outlook drawing of a casting die.

FIG. 3( b) is a cross-sectional view of the primary portion of a casting die.

FIG. 4 is a cross-sectional view of the first embodiment of a sandwich press rotator.

FIG. 5 is a cross-sectional view of the second embodiment of a sandwich press rotator at a plane perpendicular to the rotation axis.

FIG. 6 is a cross-sectional view of the second embodiment of a sandwich press rotator at a plane including the rotation axis.

FIG. 7 is an analytical oblique view to show a brief constitution of a liquid crystal display.

FIGS. 8( a)-8(c) are drawings to show a storing state of a film master roll for a display.

Claims

1. A film for a display comprising a cellulose ester and a compound represented by Formula (I) or (Ia):

2. The film for a display of claim 1, wherein R1 in Formula (I) is a conjugated substituent when n is 1; orR1a in Formula (Ia) is a conjugated substituent when n is 1.

3. The film for a display of claim 1, wherein the compound represented by Formula (I) is a compound represented by Formula (I-1):

4. The film for a display of claim 1, wherein a sum of Hammett's σp values of R7 to R11 is 0 or less.

5. The film for a display of claim 1, wherein the compound represented by Formula (I) is a compound represented by Formula (I-2):

6. The film for a display of claim 1, wherein R5 in Formula (I) is a hydrogen atom.

7. The film for a display of claim 1, wherein the compound represented by Formula (Ia) is a compound represented by Formula (I-3):

8. The film for a display of claim 1 further comprising a compound represented by Formula (A):

9. The film for a display of claim 1 further comprising a phosphonite compound.

10. The film for a display of claim 1, wherein a transmittance of the film for a light flux having a wavelength of 450 nm is 90% or more.

11. The film for a display of claim 1, wherein the cellulose ester is a mixed fatty acids ester.

12. The film for a display of claim 1, wherein a total number of carbon atoms contained in acyl groups in one glucose unit of the cellulose ester is 6.1 to 7.5, wherein the total number of carbon atoms represents a sum of each product of a number of carbon atoms of each acyl group multiplied by a substitution degree of the acyl group, wherein the substitution degree represents an average number of 3 hydroxyl groups replaced with an acyl group in one glucose unit of the cellulose ester.

13. The film for a display of claim 1, wherein the film is a long length film wound in a roll.

14. A polarizing plate protective film for a liquid crystal display comprising the film for a display of claim 1.

15. The polarizing plate protective film of claim 14, wherein the polarizing plate protective film is a long length film wound in a roll.

16. A polarizing plate comprising the polarizing plate protective film of claim 14 provided on at least one surface of a polarizer film.

17. A polarizing plate comprising the polarizing plate protective film of claim 15 provided on at least one surface of a polarizer film.

18. A method to produce the polarizing plate of claim 17 comprising the steps of: (i) producing the long length polarizing plate protective film;(ii) winding the long length polarizing plate protective film in a roll; and(iii) winding back the long length polarizing plate protective film from the roll and laminating the polarizing plate protective film with a polarizer film to form a polarizing plate.

19. A method to produce a polarizing plate comprising the steps of: (a) melting a mixture of a cellulose ester and a compound represented by a formula selected from the group consisting of Formulas (I), (Ia), (I-1), (I-2) and (I-3);(b) extruding the melt of the mixture to form a film;(c) cooling the extruded film on a substrate;(d) peeling the film from the substrate;(e) stretching the film; and(f) laminating the film with a polarizer film to form a polarizing plate:

20. A liquid crystal display comprising the polarizing plate of claim 16 provided on at least one surface of a liquid crystal cell.

21. A liquid crystal display comprising a polarizing plate produced by the method of claim 18 provided on at least one surface of a liquid crystal cell.

22. A liquid crystal display comprising a polarizing plate produced by the method of claim 19 provided on at least one surface of a liquid crystal cell.