| http://www.w3.org/ns/prov#value | - Particularly preferred as the antimony oxide sol which can be used in the present invention is an acid sol having a primary particle diameter of 2 to 100 nm, more preferably 2 to 50 nm, and containing no base, such as an amine or sodium The antimony oxide sol which can be used may contain antimony oxide (Sb2O5, Sb6O13, or Sb2O4) in a concentration of 1 to 60% by weight.
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