Polishing film and method of producing same

Abstract

A polishing film includes a plastic film and a polishing layer formed on its surface, having a mixture of a first group of silica particles with a first average diameter and a second group of silica particles with a second average diameter fixed in a resin binder, the first average diameter and the second diameter being different from each other and both within a range of 0.001-10 μm. The mixture of the two groups of silica particles has a granularity distribution curve with two peaks at two different diameter values corresponding to the first and second average diameters.

What is claimed is:  
     
         1 . A polishing film comprising: 
 a plastic film having a surface; and    a polishing layer formed on said surface of said plastic film, said polishing layer having a mixture of a first group of silica particles with a first average diameter and a second group of silica particles with a second average diameter fixed in a resin binder, said first average diameter and said second diameter being different from each other and both within a range of 0.001-10 μm.    
     
     
         2 . The polishing film of  claim 1  wherein said mixture has a granularity distribution curve with two peaks at two different diameter values corresponding to said first average diameter and said second average diameter.  
     
     
         3 . The polishing film of  claim 1  which polishes an end surface of an optical fiber connector and has a surface with a network of cracks, wherein said resin binder includes oligomers with siloxane bonds.  
     
     
         4 . The polishing film of  claim 3  wherein said mixture has a granularity distribution curve with two peaks at two different diameter values corresponding to said first average diameter and said second average diameter.  
     
     
         5 . A method of producing a polishing film, said method comprising the steps of: 
 applying a paint on a surface of a plastic film, said paint being obtained by dispersing in a resin binder solution a mixture of a first group of silica particles with a first average diameter and a second group of silica particles with a second average diameter, said first average diameter and said second diameter being different from each other and both within a range of 0.001-10 μm; and    drying said paint to form a polishing layer on said surface of said plastic film whereby said polishing film is produced.    
     
     
         6 . The method of  claim 5  wherein said mixture has a granularity distribution curve with two peaks at two different diameter values corresponding to said first average diameter and said second average diameter.  
     
     
         7 . The method of  claim 5  wherein said polishing film polishes an end surface of an optical fiber connector and has a surface with a network of cracks, and wherein said resin binder includes oligomers with siloxane bonds.  
     
     
         8 . The method of  claim 7  wherein said mixture has a granularity distribution curve with two peaks at two different diameter values corresponding to said first average diameter and said second average diameter.  
     
     
         9 . The method of  claim 5  wherein said resin binder includes oligomers with siloxane bonds.  
     
     
         10 . The method of  claim 6  wherein said resin binder includes oligomers with siloxane bonds.  
     
     
         11 . The method of  claim 7  wherein said resin binder includes oligomers with siloxane bonds.  
     
     
         12 . The method of  claim 8  wherein said resin binder includes oligomers with siloxane bonds.  
     
     
         13 . The method of  claim 5  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         14 . The method of  claim 6  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         15 . The method of  claim 7  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         16 . The method of  claim 8  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         17 . The method of  claim 9  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         18 . The method of  claim 10  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         19 . The method of  claim 11  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.  
     
     
         20 . The method of  claim 12  wherein the step of drying includes the step of forming a network of cracks on said polishing layer.