Transparent brittle film

A process for producing a transparent brittle film having a light transmission of 20% or more in a range of wave length of 300 to 700 nm and a tensile strength at break of 1.0 to 3.0 kg/mm.sup.2, which comprises

• preparing a homogeneous organosol by thoroughly mixing (A) 10 parts by weight of a vinyl chloride resin, (B) 20 to 200 parts by weight of an acrylic resin, (C) 20 to 250 parts by weight of at least one type of filler selected from the group consisting of (a) fused silica comprising aggregates of particles having an average particle diameter in the range of 5 to 20 .mu.m and individual particle diameters in the range of 0.5 to 100 .mu.m, (b) aluminum hydroxide comprising aggregates of particles having an average particle diameter in the range of 1 to 20 .mu.m and individual particle diameters in the range of 0.2 to 50 .mu.m, and (c) barium sulfate comprising aggregates of particles having an average particle diameter in the range of 1 to 20 .mu.m and individual particle diameters in the range of 0.2 to 50 .mu.m, (D) 0 to 40 parts by weight of a plasticizer, (E) 0.5 to 10 parts by weight of a stabilizer, and (F) 100 to 400 parts by weight of a poor solvent,
• coating a support with the prepared mixture, and
• drying a film to form a gel.