Patent GB-1001438-A (GB)
Title: Sheet containing mica and glass
IPC: C04B32/00
Filed: 1964-04-16
Abstract: A laminar sheet comprises orientated mica flakes and glass flakes. The majority of the flakes are less than 5 m  thick.  The mica flakes are formed by splitting the mica in a liquid medium. The glass flakes, preferably of size and thickness similar to the mica flakes, may be formed by extruding molten glass in a sheet 4 m  thick, which will fracture naturally, the flakes formed being received in a liquid, e.g. water, or in a device wherein they are mixed with the mica flakes.  The glass flakes may be removed from the liquid and stored in block form before incorporation into the sheet.  The proportion of glass in the sheet may be, e.g., 20-60% by weight.  The mica and glass flakes may be generally intermingled or may form alternate layers.  The sheet may be formed by depositing the mica and glass flakes from a liquid medium to form a layer, and then removing the liquid medium.  The flakes are formed into an integrated sheet by pressure and/or fusion.  A thin glass coating may be applied to one or both surfaces of the sheet.  Specifications 615,489 and 696,992 are referred to.ALSO:A laminar sheet comprises orientated mica flakes and glass flakes.  The majority of the flakes are less than 5 m thick.  The mica flakes are formed by splitting the mica in a liquid medium. The glass flakes, preferably of size and thickness similar to the mica flakes, may be formed by extruding molten glass in a sheet 4m  thick, which will fracture naturally, the flakes formed being received in a liquid, e.g. water, or in a device wherein they are mixed with the mica flakes.  The glass flakes may be removed from the liquid and stored in block form before incorporation into the sheet. The proportion of glass in the sheet may be, e.g., 20-60% by weight. The mica and glass flakes may be generally intermingled or may form alternate layers.  The sheet may be formed by depositing the mica and glass flakes from a liquid medium to form a layer, and then removing the liquid medium.  The flakes are formed into an integrated sheet by pressure and/or fusion.  A thin glass coating may be applied to one or both surfaces of the sheet.  A glass that may be used is the type " E " glass having the composition: silica 54%; lime 16%; alumina 16%; boron oxide 10%; soda and potash 4%.  Another suitable type of glass is lead borate glass.  Specifications 615,489 and 696,992 are referred to.ALSO:A laminar sheet comprises orientated mica flakes and glass flakes.  The sheet is formed by depositing the mica and glass flakes from a liquid medium to form a layer, and then removing the liquid medium.  The majority of the flakes are less than 5m  thick. The mica flakes are formed by splitting the mica in a liquid medium. The glass flakes, preferably of size and thickness similar to the mica flakes, may be formed by extruding molten glass in a sheet 4m thick, which will fracture naturally, the flakes formed being received in a liquid, e.g. water, or in a device wherein they are mixed with the mica flakes.  The glass flakes may be removed from the liquid and stored in block form before incorporation into the sheet. The proportion of glass in the sheet may be e.g. 20-60% by weight. The mica and glass flakes may be generally intermingled or may form alternate layers.  The flakes are formed into an integrated sheet by pressure and/or fusion.  A thin glass coating may be applied to one or both surfaces of the sheet.  Specifications 615,489 and 696,992 are referred to.