Composition for optical film, and optical film

1. A composition for an optical film comprising a stabilized cyanine dye and a quencher compound, wherein the stabilized cyanine dye comprises a cation and a quencher anion, and the cation is selected from the group consisting of compounds of the following formulae (I) to (III):

wherein each of rings A and A′ which are independent of each other, is a benzene ring, a naphthalene ring or a pyridine ring, each of R 1 and R 1 ′ which are independent of each other, is a halogen atom, a nitro group, a cyano group, a C 6-30 aryl group, a C 1-8 alkyl group or a C 1-8 alkoxy group, each of R 2 , R 3 and R 4 which are independent of one another, is a hydrogen atom, a halogen atom, a cyano group, a C 6-30 aryl group, a diphenylamino group or a C 1-8 alkyl group, each of X and X′ which are independent of each other, is an oxygen atom, a sulfur atom, a selenium atom, a propan-2,2-diyl group, a butan-2,2-diyl group, a C 3-6 cycloalkan-1,1-diyl group, —NH—or —NY 1 , —each of Y,Y′ and Y 1 which are independent of one another, is a C 1-30 organic group, and each of r and r′ which are independent of each other, is an integer of from 0 to 2.

2. The composition for an optical film according to claim 1 , wherein the quencher compound comprises a near infrared absorptive quencher compound.

3. The composition for an optical film according to claim 2 , wherein the near infrared absorptive quencher compound comprises a diimomum dye of the following formula (IV):

wherein each of R 17 to R 24 which are independent of one another, is a hydrogen atom, an alkyl group which may be substituted, an alkenyl group which may be substituted, an aryl group which may be substituted or an alkynyl group which may be substituted, and Z − is an anion.

4. An optical film having a near infrared absorbing layer which comprises a transparent resin and the composition for an optical film as defined in claim 1 , dispersed in the transparent resin.

5. An optical film having a near infrared absorbing layer which comprises a transparent resin and the composition for an optical film as defined in claim 2 , dispersed in the transparent resin.

6. An optical film having a near infrared absorbing layer which comprises a transparent resin and the composition for an optical film as defined in claim 3 , dispersed in the transparent resin.

7. An optical film having a near infrared absorbing layer which comprises a transparent resin and a diimonium dye of the following formula (V) contained in the transparent resin:

wherein each of R 17 to R 24 which are independent from one another, is a hydrogen atom, an alkyl group which may be substituted, an alkenyl group which may be substituted, an aryl group which may be substituted, or an alkynyl group which may be substituted, X − is an anion represented by (R f SO 2 ) 2 N − or (R f SO 2 ) 3 C − , and R f is a C 1-4 fluoroalkyl group.

8. The optical film according to claim 7 , wherein the fluoroalkyl group is a perfluoroalkyl group.

9. The optical film according to claim 7 , which further contains a near infrared absorbing dye other than the above diimonium dye, having the maximum absorption wavelength (λ max ) within a range of from 800 to 1,100 nm, in the transparent resin.

10. The optical film according to claim 8 , which further contains a near infrared absorbing dye other than the above diimonium dye, having the maximum absorption wavelength (λ max ) within a range of from 800 to 1,100 nm, in the transparent resin.

11. A plasma display device, which comprises:

a plasma display panel having the optical film of claim 1 on the viewing side of the plasma display panel.

12. A plasma display device, which comprises:

a plasma display panel having the optical film of claim 7 on the viewing side of the plasma display panel.