AZO-COMPOUND AND SALT THEREOF AND DYE-CONTAINING POLARISING FILM CONTAINING SAID COMPOUND OR SALT THEREOF Russian patent published in 2011 - IPC C09B56/04 G03B21/00 G02B5/30 

FIELD: chemistry.

SUBSTANCE: disclosed is an azo-compound of formula (1) or salt thereof: , where R1 and R2 independently denote a hydrogen atom, a lower alkyl group or a lower alkoxy group; n equals 1 or 2. Described also is a dye-containing polarising film and a dye-containing polarising plate, each containing a base material and azo-compound (1), contained in the base material.

EFFECT: design of a polarising plate with high efficiency, moisture, heat and light resistance, and does not allow light to escape in the perpendicular direction in the visible light wavelength range.

9 cl, 3 tbl, 8 ex