Glass filler and method for producing the same

Abstract

A glass filler of the present disclosure includes glass having a composition, the composition including iron oxide. For the content in mass % of the iron oxide in the composition, 0.005≤FeO≤0.30 and 0.01≤T-Fe2O3≤0.80 (T-Fe2O3 represents total iron oxide calculated as Fe2O3) are satisfied. For the iron oxide in the composition, Fe2+/(Fe2++Fe3+), which represents the proportion by mass of Fe2+ to total iron, is 0.15 or more and 1.00 or less. The glass filler of the present disclosure is a glass filler having a new composition including a coloring component, the glass filler having a high visible transmittance and a controlled color which can be, for example, within a range of colors different from those of conventional glass fillers that have a low visible transmittance.

1 - 24 . (canceled) 
     
     
         25 . A glass filler comprising glass having a composition, the composition comprising iron oxide, wherein
 for the content of the iron oxide in mass %, the following are satisfied:
   0.005≤FeO≤0.30; and
 
   0.01≤T-Fe 2 O 3 <0.50,
 
   
       wherein T-Fe 2 O 3  represents total iron oxide calculated as Fe 2 O 3 ,
 for the iron oxide in the composition, Fe 2+ /(Fe 2+ +Fe 3+ ) is 0.45 or more and 1.00 or less, wherein Fe 2+ /(Fe 2+ +Fe 3+ ) represents the proportion by mass of Fe 2+  to total iron; 
 the composition further comprises the following components, in mass %:
   60≤SiO 2 ≤75,
 
   2≤B 2 O 3 ≤8,
 
   2≤Al 2 O 3 ≤4.07,
 
   5<B 2 O 3 +Al 2 O 3 <12, 
   3≤CaO≤20,
 
   0.1≤Li 2 O≤5,
 
   6≤Na 2 O≤10.3, and
 
   9≤(Li 2 O+Na 2 O+K 2 O)≤12; and
 
 
 the glass filler is a glass flake. 
 
     
     
         26 . A glass filler comprising glass having a composition, the composition comprising iron oxide, wherein
 for the content of the iron oxide in mass %, the following are satisfied:
   0.005≤FeO≤0.30; and
 
   0.01≤T-Fe 2 O 3 <0.50,
 
   
       wherein T-Fe 2 O 3  represents total iron oxide calculated as Fe 2 O 3 ,
 for the iron oxide in the composition, Fe 2+ /(Fe 2+ +Fe 3+ ) is 0.45 or more and 1.00 or less, wherein Fe 2+ /(Fe 2+ +Fe 3+ ) represents the proportion by mass of Fe 2+  to total iron; 
 the composition further comprises the following components, in mass %:
   60≤SiO 2 ≤75,
 
   2≤B 2 O 3 ≤8,
 
   2≤Al 2 O 3 ≤4.07,
 
   5<B 2 O 3 +Al 2 O 3 <12, 
   3≤CaO≤20,
 
   0.1≤ZnO≤10,
 
   6≤Na 2 O≤12, and
 
   9≤(Li 2 O+Na 2 O+K 2 O)≤12; and
 
 
 the glass filler is a glass flake. 
 
     
     
         27 . A glass filler comprising glass having a composition, the composition comprising iron oxide, wherein
 for the content of the iron oxide in mass %, the following are satisfied:
   0.005≤FeO≤0.30; and
 
   0.01≤T-Fe 2 O 3 <0.50,
 
   
       wherein T-Fe 2 O 3  represents total iron oxide calculated as Fe 2 O 3 ,
 for the iron oxide in the composition, Fe 2+ /(Fe 2+ +Fe 3+ ) is 0.45 or more and 1.00 or less, wherein Fe 2+ /(Fe 2+ +Fe 3+ ) represents the proportion by mass of Fe 2+  to total iron, and 
 the composition further comprises the following components, in mass %:
   59≤SiO 2 ≤65,
 
   8≤Al 2 O 3 ≤15,
 
   1≤MgO≤5,
 
   15≤CaO≤30, and
 
   0≤(Li 2 O+Na 2 O+K 2 O)≤4; and
 
 
 the glass filler is a glass flake.