Film and uses thereof

Abstract

Disclosed is a film composed of a resin having a thiourethane bond, wherein the molar ratio (S/N) of sulfur to nitrogen contained in the resin is equal to or more than 0.8 and less than 3. According to the present invention, the film is excellent in a balance among high refractive index, low birefringence and light transmittance, and further excellent in a balance of mechanical characteristics such as toughness, hardness and dimensional stability, so that effects of deformation and the like during processing are very small, and the film is further excellent in solvent resistance as well.

1 . A film comprising a resin having a thiourethane bond, wherein the molar ratio (S/N) of sulfur to nitrogen contained in said resin is equal to or more than 0.8 and less than 3. 
     
     
         2 . The film according to  claim 1 , wherein the refractive index in a sodium D line is equal to or more than 1.6, the in-plane birefringence Δn n  of a film having a film thickness of 1 to 200 μm at a wavelength 590 nm is equal to or less than 1.0×10 −2 , the birefringence Δn in the thickness direction is equal to or less than 1.0×10 −3 , and the mean value of the light transmittance to the light having a wavelength 400 to 800 nm is equal to or more than 80%. 
     
     
         3 . The film according to  claim 1 , wherein the resin having a thiourethane bond has an aromatic group, a heterocyclic group or an alicyclic group in the structure. 
     
     
         4 . The film according to  claim 1 , obtained by a casting method. 
     
     
         5 . The film according to  claim 1 , containing partially a thiourethane bond, and further obtained by a casting method from a mixture of a compound having an isocyanate group and a compound having a thiol group which are capable of forming thiourethane. 
     
     
         6 . The film according to  claim 1 , containing partially a thiourethane bond, and further obtained by injecting a mixture of a compound having an isocyanate group and a compound having a thiol group, which is capable of forming a thiourethane between surfaces of a space of equal to or less than 200 μm and polymerizing and curing the mixture. 
     
     
         7 . The film according to  claim 5 , wherein said compound having a thiol group contains at least one kind of compounds having three or more mercapto groups. 
     
     
         8 . An optical film comprising the film according to  claim 1 . 
     
     
         9 . An optical member, wherein the optical film according to  claim 8  is formed inside or outside thereof. 
     
     
         10 . A display equipped with the optical film according to  claim 8 . 
     
     
         11 . A light emitting device, wherein the optical film according to  claim 8  is formed inside or outside thereof. 
     
     
         12 . A lighting device using the light emitting device according to  claim 11 . 
     
     
         13 . An image display device using the light emitting device according to  claim 11 .