| 摘要 |
PURPOSE:To enable transparent chemical reinforcement without cloudiness and warpage by immersing and treating polished glass in a melting salt incorporating specified ions large in ionic radius and thereafter immersing and pretreating it in the melted salt incorporating Na ion or Li ion and then chemically reinforcing it. CONSTITUTION:Polished glass especially surface-polished glass produced by a floating system is immersed and treated in a melted liquid incorporating K ion or Rb ion at 350-510 deg.C for 1-600sec. Then after immersing and pretreating it in the melted salt incorporating Na ion or K ion, it is chemically reinforced by a low temp. type ion exchange method. A chemically reinforced glass product, little in amount of warpage, of high strength and also transparent can be produced by immersing it into the melted salt incorporating K ion or Rb ion having ionic radius larger than Na ion or Li ion for the above-mentioned slight time before immersing and pretreating it in the melted salt incorporating Na ion or Li ion.
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