Polarizing film-integrated transparent electrically conductive f

Details Polarizing film-integrated transparent electrically conductive f Polarizing film-integrated transparent electrically conductive f

1987-02-12

1988-09-27

Ives, P. C.

Stock material or miscellaneous articles

Composite

Of epoxy ether

428 1, 428419, 4284246, 428688, 428522, 428704, 428523, 428913, 427124, 427162, 8489, 8687, B32B 2738, G02B 530, D06P 700

Patent

active

047741414

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a polarizing film-integrated transparent electrically conductive film. Particularly, this invention relates to a polarizing film-integrated transparent electrically conductive film wherein a polysulfone film as a support layer is laminated on a polyvinylalcohol polarizing film which has been dyed with a disazo compound and furthermore a transparent electrically conductive film is laminated on the laminated film.


TECHNICAL BACKGROUND

For the purpose of simplifying a process for preparing TN-type liquid crystal display elements and reducing its cost, there has previously used an organic polymer film as a support layer for a polarizing film and to provided its surface with a transparent electrically conductive film so that the polarizing film and the transparent electrically conductive film may be integrated. As a support layer for a polarizing film, there has hitherto been used an acetate film, for example, a triacetate cellulose film (TAC film). However, in the production of an integral type, the TAC film has the defects that it cannot resist the conditions in sputtering or vacuum deposition for forming a transparent electrically conductive film of high quality and the conditions in assembling liquid crystal display elements because it is inferior in heat resistance. It is not desirable either from the aspect as a support layer for a polarizing film that the film has low heat resistance.
Films including polyester, which have hitherto been studied as transparent electrically conductive films, are subjected to orientation by stretching in order to exhibit their high molecular characteristics and thus have optical anisotropy. The optical anisotropy is a fatal defect for TN-type liquid crystal display elements which employ the polarization of light.
As a polarizing element which is incorporated in a polarizing film, iodine has hitherto been used and organic dyes have recently been investigated also organic dyes. However, iodine has a large sublimability and thus is insufficient in its heat resistance when it is incorporated in a polarizing film as a polarizing element. As regards the organic dyes, the conventional ones were considerably inferior to iodine in polarizing property.
For the purpose of achieving the simplification and cost reduction in the production process of a TN-type liquid crystal display element by making an integral type of a polarizing film and a transparent electrically conductive film which have been difficult to achieve, there has been a requirement for the development of a polarizing element having a satisfactory heat resistance and a polarizing property comparable to that of iodine, the development of a resin capable of forming the integral structure with a polarizing film containing the polarizing element therein, and the like.


DISCLOSURE OF THE INVENTION

The present inventors have earnestly conducted researches for solving the above-mentioned problems. As a result, they have attained the present invention. That is to say, this invention provides a polarizing film-integrated transparent electrically conductive film, wherein a polysulfone film as a support layer is laminated on at least one surface of a polyvinylalcohol polarizing film which has been dyed with a water-soluble disazo compound as a free acid represented by the general formula (1) ##STR3## wherein X represents nitro group or amino group, A represents the formula (a) or (b) ##STR4## (wherein R.sub.1 represents hydrogen atom, methoxy group, ethoxy group, methyl group or hydroxyl group, R.sub.2 represents hydrogen atom, methyl group, methoxy group, ethoxy group, acetylamino group or ureido group, R.sub.3 represents hydrogen atom, methoxy group or ethoxy group, and n is 0 or 1), Y represents amino group, methylamino group, acetylamino group, N-methyl-N-acetylamino group, a .beta.-hydroxyethylamino group, or a phenylamino or benzoylamino group in which the phenyl nucleus may be substituted by one or two of nitro group, amino group, hydroxyl group, methyl group, sulfonic acid grou

REFERENCES:
patent: 4387133 (1983-06-01), Khikawa et al.
patent: 4388375 (1983-06-01), Hopper et al.
patent: 4427741 (1984-01-01), Aizawa et al.

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