Optical information recording method and medium

Abstract

An optical information recording medium includes a substrate having disposed thereon a recording layer that is recordable by irradiating the recording layer with a laser having a wavelength of 450 nm or less. The recording layer contains a specific phthalocyanine derivative. An optical information recording method uses the medium.

1 - 12 . (canceled)  
     
     
         13 . A method of recording information on an optical information recording medium by irradiating the medium with a laser having a wavelength no greater than 450 nm, wherein the medium comprises a substrate having disposed thereon a recording layer on which information is recordable by irradiating the medium with laser light having a wavelength no greater than 450 nm, wherein the recording layer contains a phthalocyanine compound and has a refractive index (n) in a range of 1.5<n<1.9 and an extinction coefficient (k) in a range of 0.04<k<0.15.  
     
     
         14 . The method of recording information on an optical information recording medium of  claim 13 , wherein the recording layer is formed by coating a coating solution on said substrate.  
     
     
         15 . The method of recording information on an optical information recording medium of  claim 13 , wherein the recording layer contains a phthalocyanine compound represented by Formula (I):  
       
         
           
           
               
               
           
         
         wherein R α1  to R α8  and R β1  to R β8  each independently represents one selected from the group consisting of a hydrogen atom, a halogen atom, a cyano group, a nitro group, a formyl group, a carboxyl group, a sulfo group, an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 14 carbon atoms, an aralkyl group having 7 to 15 carbon atoms, a heterocyclic group having 1 to 10 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryloxy group having 6 to 14 carbon atoms, an acyl group having 2 to 21 carbon atoms, an alkylsulfonyl group having 1 to 20 carbon atoms, an arylsulfonyl group having 6 to 14 carbon atoms, an aralkylsulfonyl group having 7 to 15 carbon atoms, a heterylsulfonyl group having 1 to 10 carbon atoms, a carbamoyl group having 1 to 25 carbon atoms, a sulfamoyl group having 0 to 32 carbon atoms, an alkoxycarbonyl group having 2 to 21 carbon atoms, an aryloxycarbonyl group having 7 to 15 carbon atoms, an acylamino group having 2 to 21 carbon atoms, a sulfonylamino group having 1 to 20 carbon atoms, and an amino group having 0 to 36 carbon atoms; and M represents two hydrogen atoms, a metal, a metal oxide, or a metal having a ligand.  
       
     
     
         16 . The method of recording information on an optical information recording medium of  claim 15 , wherein M represents a metal selected from the group consisting of zinc, magnesium, copper, nickel, and palladium.  
     
     
         17 . The method of recording information on an optical information recording medium according to  claim 15 , wherein all of R β1  to R β8  in the Formula (I) are simultaneously hydrogen atoms.  
     
     
         18 . The method of recording information on an optical information recording medium of  claim 13 , wherein the medium further comprises a reflective layer of metal formed disposed on the recording layer.  
     
     
         19 . The method of recording information on an optical information recording medium of  claim 13 , wherein the medium further comprises a protective layer disposed on the recording layer.  
     
     
         20 . The method of recording information on an optical information recording medium of  claim 13 , wherein a pre-groove having a track pitch of 0.2 to 0.5 μm is formed on the surface of the substrate disposed with the recording layer of the medium.  
     
     
         21 . An optical information recording medium used in a method of recording information by irradiating the medium with a laser having a wavelength no greater than 450 nm, wherein a recording layer of the optical information recording medium is disposed on a substrate and contains a phthalocyanine compound represented by Formula (I):  
       
         
           
           
               
               
           
         
         wherein R α1  to R α8  and R β1  to R β8  each independently represents one selected from the group consisting of a hydrogen atom, an alkylsulfonyl group having 1 to 20 carbon atoms, an arylsulfonyl group having 6 to 14 carbon atoms, and an aralkylsulfonyl group having 7 to 15 carbon atoms; and M represents two hydrogen atoms, a metal, a metal oxide, or a metal having a ligand; and  
         wherein the recording layer has a refractive index (n) in a range of 1.5<n<1.9 and an extinction coefficient (k) in a range of 0.04<k<0.15.  
       
     
     
         22 . The optical information recording medium of  claim 21 , wherein the recording layer is formed by coating a coating solution on said substrate.  
     
     
         23 . The optical information recording medium of  claim 21 , wherein M represents a metal selected from the group consisting of zinc, magnesium, copper, nickel, and palladium.  
     
     
         24 . The optical information recording medium of  claim 21 , wherein all of R β1  to R β8  in the Formula (I) are simultaneously hydrogen atoms.  
     
     
         25 . The optical information recording medium of  claim 21 , wherein the medium further comprises a reflective layer of metal formed disposed on the recording layer.  
     
     
         26 . The optical information recording medium of  claim 21 , wherein the medium further comprises a protective layer disposed on the recording layer.  
     
     
         27 . The optical information recording medium of  claim 21 , wherein a pre-groove having a track pitch of 0.2 to 0.5 μm is formed on the surface of the substrate disposed with the recording layer of the medium.