Hard coating layered optical film, polarizer comprising the same, and image display comprising the hard coating layered optical film and/or the polarizer comprising the same

Abstract

The present invention is to provide a hard coating layered optical film, comprising a poly(methylmethacrylate) (PMMA) base film and a hard coating layer thereon. The hard coating layer comprises a (meth)acrylate composition and an initiator, wherein the (meth)acrylate composition comprises a urethane (meth)acrylate oligomer of functionalities from 6 to 15, at least one (meth)acrylate monomer of functionalities from 3 to 6 and at least one (meth)acrylate monomer of functionalities less than 3, wherein the molecular weight of the (meth)urethane acrylate oligomer of functionalities from 6 to 15 is ranging between 1,000 to 4,500. The hard coating layer of the hard coating layered optical film can be further coated with a functional layer, such as a low reflection layer to form an anti-reflection hard coating layered optical film. The hard coating layer can optionally comprise micro-particles to generate an anti-glare hard coating film. The anti-glare hard coating film can be further coated with a functional layer, such as a low reflection layer to form an anti-reflection anti-glare hard coating layered optical film.

What is claimed is: 
     
         1 . A hard coating film comprising a polymethyl methacrylate (PMMA) base film and a hard coating layer formed thereon, wherein the hard coating layer comprises a (meth)acrylate composition and an initiator, and the (meth)acrylate composition comprises:
 a urethane (meth)acrylate oligomer with a functionality of 6 to 15 and the molecular weight thereof ranging between 1,000 and 4,500;   at least one (meth)acrylate monomer with a functionality of 3 to 6; and   at least one (meth)acrylate monomer with a functionality of less than 3.   
     
     
         2 . The hard coating film as claimed in  claim 1 , wherein the (meth)acrylate composition comprises:
 35 to 50 weight parts of the urethane (meth)acrylate oligomer with a functionality of 6 to 15;   12 to 20 weight parts of the at least one (meth)acrylate monomer with a functionality of 3 to 6; and   1.5 to 12 weight parts of the at least one (meth)acrylate monomer with a functionality of less than 3.   
     
     
         3 . The hard coating film as claimed in  claim 1 , wherein the urethane (meth)acrylate oligomer with a functionality of 6 to 15 is an aliphatic urethane (meth)acrylate oligomer. 
     
     
         4 . The hard coating film as claimed in  claim 1 , wherein the (meth)acrylate monomer with a functionality of 3 to 6 is selected from one of the group consisting of pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate (DPP(M)A), dipentaerythritol hexa(meth)acrylate (DPH(M)A), trimethylolpropane tri(meth)acrylate (TMPT(M)A), ditrimethylolpropane tetra(meth)acrylate (DTMPT(M)A) and pentaerythritol tri(meth)acrylate (PET(M)A), or combinations thereof. 
     
     
         5 . The hard coating film as claimed in  claim 1 , wherein the (meth)acrylate monomer with a functionality of less than 3 is selected from one of a group consisting of 2-ethylhexyl (meth)acrylate (2-EH(M)A), 2-hydroxyethyl (meth)acrylate (2-HE(M)A), 2-hydroxypropyl (meth)acrylate (2-HP(M)A), 2-hydroxybutyl (meth)acrylate(2-HB(M)A), 2-butoxyethyl (meth)acrylate), 1,6-hexanediol di(meth)acrylate (HDD(M)A), cyclic trimethylolpropane formal (meth)acrylate (CTF(M)A), 2-phenoxyethyl (meth)acrylate (PHE(M)A), tetrahydrofurfuryl (meth)acrylate (THF(M)A), lauryl (meth)acrylate (L(M)A), diethylene glycol di(meth)acrylate (DEGD(M)A), dipropylene glycol di(meth)acrylate (DPGD(M)A), tripropylene glycol di(meth)acrylate (TPGD(M)A) and isobornyl (meth)acrylate, or combinations thereof. 
     
     
         6 . The hard coating film as claimed in  claim 1 , wherein the initiator is selected from at least one of the group consisting of acetophenones, diphenylketones, propiophenones, benzophenones, α-hydroxyketones, fluorenylphosphine oxides and the like. 
     
     
         7 . A hard coating film comprising a polymethyl methacrylate (PMMA) base film, a hard coating layer formed thereon and a low refractive layer formed on the hard coating layer, wherein the hard coating layer comprises an initiator and a (meth)acrylate composition comprising:
 a urethane (meth)acrylate oligomer with a functionality of 6 to 15 and the molecular weight thereof ranging between 1,000 and 4,500;   at least one (meth)acrylate monomer with a functionality of 3 to 6; and   at least one (meth)acrylate monomer with a functionality of less than 3;   wherein the low refractive layer comprises:   a binder resin;   a plurality of hollow silica nanoparticles;   an initiator; and   a leveling agent comprising a perfluoropolyether group-containing (meth)acrylic-modified organosilicone;   wherein the reflectivity of the hard coating film is ranging between 1.2% and 1.4%.   
     
     
         8 . The hard coating film as claimed in  claim 7 , wherein the perfluoropolyether group-containing (meth)acrylic-modified organosilicone comprises a compound represented by the following formula (I) or a compound represented by the following formula (II): 
       
         
           
           
               
               
           
         
         wherein b′ 1 +b′ 2  is ranging between 2 and 6.5, and Rf′ 12  is represented by the following formula: 
       
       
         
           
           
               
               
           
         
         wherein n1 is ranging between 2 and 100. 
       
     
     
         9 . The hard coating film as claimed in  claim 7 , wherein the number average molecular weight of the perfluoropolyether group-containing (meth)acrylic-modified organosilicone compound is ranging between 1,500 and 16,000. 
     
     
         10 . The hard coating film as claimed in  claim 7 , wherein the amount of the leveling agent comprising perfluoropolyether group-containing (meth)acrylic-modified organosilicone compound is ranging from 5 weight parts to 20 weight parts relative to per 100 weight parts of (meth)acrylate resin. 
     
     
         11 . The hard coating film as claimed in  claim 7 , wherein the binder resin is selected from at least one of the group consisting of pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, pentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, trimethylolpropane tri(meth)acrylate, ditrimethylolpropane tetra(meth)acrylate and dipentaerythritol tetra(meth)acrylate, or combinations thereof. 
     
     
         12 . The hard coating film as claimed in  claim 7 , wherein the average particle diameter of the hollow silica nanoparticles is ranging between 50 nm and 100 nm. 
     
     
         13 . The hard coating film as claimed in  claim 7 , wherein the amount of the hollow silica nanoparticles is ranging from 60 weight parts to 130 weight parts relative to 100 weight parts of the binder resin. 
     
     
         14 . A hard coating film comprising a polymethyl methacrylate (PMMA) base film and an antiglare hard coating layer formed thereon, wherein the antiglare hard coating layer comprises a (meth)acrylate composition, an initiator, silica nanoparticles, organic microparticles and a leveling agent, wherein the (meth)acrylate composition comprises:
 a urethane (meth)acrylate oligomer with a functionality of 6 to 15 and a molecular weight ranging between 1,000 and 4,500;   at least one (meth)acrylate monomer with a functionality of 3 to 6; and   at least one (meth)acrylate monomer with functionality of less than 3.   
     
     
         15 . The hard coating film as claimed in  14 , wherein the surface roughness of the hard coating film has a mean spacing between peaks (Sm) of between 20 μm and 50 μm, an arithmetic mean deviation of surface (Ra) of between 0.03 μm to 0.09 μm, a largest peak to valley height (Ry) of between 0.25 μm and 0.60 μm, a ten-point mean roughness (Rz) of between 0.15 μm and 0.50 μm and a root mean square slope (PΔq) of between 0.5° and 1.6°. 
     
     
         16 . The hard coating film as claimed in  14  further comprising:
 a low refractive layer formed on the antiglare hard coating, wherein the low refractive layer comprises:
 a binder resin; 
 a plurality of hollow silica nanoparticles; 
 an initiator; and 
 a leveling agent; 
 wherein the leveling agent comprises a perfluoropolyether group-containing (meth)acrylic-modified organosilicone; 
 
 wherein the reflectivity of the hard coating film is ranging between 1.2% and 1.4%. 
 
     
     
         17 . The hard coating film as claimed in  16 , wherein the surface roughness of the hard coating film has a mean spacing between peaks (Sm) of between 20 μm and 90 μm, an arithmetic mean deviation of surface (Ra) of between 0.03 μm and 0.07 μm, a largest peak to valley height (Ry) of between 0.15 μm to 0.40 μm, and a ten-point mean roughness (Rz) of between 0.10 μm to 0.50 μm. 
     
     
         18 . A polarizer comprising a polarizing element, wherein the polarizer comprises a hard coating film comprising a polymethyl methacrylate (PMMA) base film and a hard coating layer formed thereon, wherein the hard coating layer comprises a (meth)acrylate composition and an initiator, wherein the (meth)acrylate composition comprises:
 a urethane (meth)acrylate oligomer with a functionality of 6 to 15 and the molecular weight thereof ranging between 1,000 and 4,500;   at least one (meth)acrylate monomer with a functionality of 3 to 6; and   at least one (meth)acrylate monomer with a functionality of less than 3.   
     
     
         19 . A display comprising a hard coating film comprising a polymethyl methacrylate (PMMA) base film and a hard coating layer formed thereon, wherein the hard coating layer comprises a (meth)acrylate composition and an initiator, and the (meth)acrylate composition comprises:
 a urethane (meth)acrylate oligomer with a functionality of 6 to 15 and the molecular weight thereof ranging between 1,000 and 4,500;   at least one (meth)acrylate monomer with a functionality of 3 to 6; and   at least one (meth)acrylate monomer with a functionality of less than 3.