High-refractive-index optical silicone oil and high-refractive-index optical silicone oil mixture

Abstract

A high-refractive-index optical silicone oil comprising a pentasiloxane having the formula RMe 2 SiO(Me 2 SiO) 3 SiMe 2 R wherein Me is methyl, each R is independently a C 8 to C 12 aralkyl, and the silicone oil has a refractive index of from 1.45 to 1.50 at 25° C.; a method of preparing a high-refractive-index optical silicone oil; a high-refractive-index optical silicone oil mixture comprising a pentasiloxane having the formula RMe 2 SiO(Me 2 SiO) 3 SiMe 2 R wherein Me is methyl, each R is independently a C 8 to C 12 aralkyl, and a disiloxane having the formula RMe 2 SiOSiMe 2 R wherein Me and R as defined above and wherein the mixture has a refractive index of from 1.45 to 1.50 at 25° C.; and a method of preparing a high-refractive-index optical silicone oil mixture.

What is claimed is:  
     
         1 . A high-refractive-index optical silicone oil comprising a pentasiloxane having the formula:  
       RMe 2 SiO(Me 2 SiO) 3 SiMe 2 R  
       wherein Me is methyl, each R is independently a C 10  to C 12  aralkyl, and the silicone oil has a refractive index of from 1.45 to 1.50 at 25° C.  
     
     
         2 . The optical silicone oil according to  claim 1 , wherein the refractive index is from 1.46 to 1.49 at 25° C.  
     
     
         3 . The optical silicone oil according to  claim 1 , wherein the oil has a viscosity of from 3 to 100 mm 2 /s at 25° C.  
     
     
         4 . The optical silicone oil according to  claim 1 , wherein the viscosity is from 5 to 50 mm 2 /s at 25° C.  
     
     
         5 . A method of preparing a high-refractive-index optical silicone oil having a refractive index of from 1.45 to 1.50 at 25° C., comprising reacting a C 8  to C 12  aryl-containing olefin with a pentasiloxane having the formula:  
       HMe 2 SiO(Me 2 SiO) 3 SiMe 2 H  
       in the presence of a supported platinum catalyst.  
     
     
         6 . The method according to  claim 5 , wherein the aryl-containing olefin is styrene or α-methylstyrene.  
     
     
         7 . The method according to  claim 5 , wherein the pentasiloxane is prepared by a nonequilibration reaction between hexamethylcyclotrisiloxane and 1,1,3,3-tetramethyldisiloxane in the presence of an acid catalyst.  
     
     
         8 . The method according to  claim 7 , wherein the acid catalyst is hydrochloric acid or trifluoromethanesulfonic acid.  
     
     
         9 . The method according to  claim 7 , wherein the mole ratio of 1,1,3,3-tetramethyldisiloxane to hexamethylcyclotrisiloxane is from 0.7:1 to 10:1.  
     
     
         10 . A method of preparing a high-refractive-index optical silicone oil mixture having a refractive index of from 1.45 to 1.50 at 25° C., comprising reacting a C 8  to C 12  aryl-containing olefin with a mixture comprising a pentasiloxane having the formula:  
       HMe 2 SiO(Me 2 SiO) 3 SiMe 2 H  
       and a disiloxane having the formula:  
       HMe 2 SiOSiMe 2 H  
       in the presence of a supported platinum catalyst,  
       wherein the pentasiloxane is prepared by a nonequilibration reaction between hexamethylcyclotrisiloxane and 1,1,3,3-tetramethyldisiloxane in the presence of an acid catalyst.  
     
     
         11 . The method according to  claim 10 , wherein the acid catalyst is hydrochloric acid or trifluoromethanesulfonic acid.  
     
     
         12 . The method according to  claim 10 , wherein the mole ratio of 1,1,3,3-tetramethyldisiloxane to hexamethylcyclotrisiloxane is from 0.7:1 to 10:1.