METHOD OF MANUFACTURING SHEET ORGANIC GLASS FOR NEUTRAL LIGHT FILTERS Russian patent published in 2005 - IPC

FIELD: polymer materials.

SUBSTANCE: sheet organic glass is obtained by way of bulk (co)polymerization of (meth)acrylic acid esters in presence of UV absorber, radical polymerization initiator, and light-absorbing additive. Process involves monomer prepolymerization and subsequent final polymerization if mixture in flat-parallel mold. Methacrylic acid esters utilized are, in particular, methyl methacrylate or its mixtures with (meth)acrylic acid or (meth)acrylic acid esters. Light-absorbing additive is methane decomposition product obtained in high-voltage discharge plasma at atmospheric pressure and characterized by loose density 0.65-0.85 g/cm³ and specific pore volume 0.40-0.50 cm/cm³. Additive, taken in amount 0.001-0.01 wt parts per 100 wt parts monomer, is mixed with prepolymer. Resulting mixture is affected by ultrasound and then polymerized in mold until conversion is completed. Sheets manufactured according to invention are suitable for neutral light filters employed in instrumentation engineering, in personal protection devices, and in sporting airplane glazing operations.

EFFECT: improved optical characteristics of glass due to more uniform light transmission in visible spectrum region.

1 tbl, 15 ex