Tool for polishing glass, method for manufacturing glass-polishing tool, and method for polishing glass

Abstract

A tool for polishing glass is formed by integrating multiple polishing elements in which polishing grains have been covered with a resin, and includes air cavities. The polishing grain volume S ratio is 50-85%, the resin volume ratio is 15-50%, the air cavity volume ratio is 20% or less, and the average grain size of the polishing elements is 10 μm or less.

What is claimed is: 
     
         1 . A tool for polishing glass which is formed by integrating multiple polishing elements in which polishing grains have been covered with a resin, and comprises air cavities, wherein
 a polishing grain volume ratio is 50-85%,   a resin volume ratio is 15-50%,   an air cavity volume ratio is 20% or less, and   an average grain size of the polishing elements is 10 μm or less.   
     
     
         2 . The tool according to  claim 1 , wherein
 an average grain size of the polishing grains is 0.4 μm or less, and   a polydispersity index is less than 0.25.   
     
     
         3 . A method for manufacturing a glass-polishing tool, which is formed by integrating multiple polishing elements in which polishing grains have been covered with a resin and comprises air cavities, wherein a polishing grain volume ratio is 50-85 %, a resin volume ratio is 15-50%, an air cavity volume ratio is 20% or less, and an average grain size of the polishing elements is 10 μm or less, the method comprising:
 mixing the polishing grains and the resin to obtain a mixture, 
 spray-drying the mixture to obtain a powder in which the polishing grains are coated with the resin, 
 pulverizing the powder to obtain a molding powder having an average grain size of 10 μm or less, and 
 pressurizing the molding powder under heating. 
 
     
     
         4 . A method for polishing optical glass using a glass-polishing tool and a processing liquid, the tool being formed by integrating multiple polishing elements in which polishing grains have been covered with a resin and comprising air cavities, wherein a polishing grain volume ratio is 50-85%, a resin volume ratio is 15-50%, an air cavity volume ratio is 20% or less, and an average grain size of the polishing elements is 10 μm or less,
 wherein a zeta potential of the polishing grains and a zeta potential of the optical glass have the same sign, and an absolute value is 40 mV or more.