Patent GB-587574-A (GB)
Title: Improvements in coloured glass fiber products
IPC: C03C25/475
Filed: 1944-03-31
Abstract: Glass fibres are coloured by coating them with a composition comprising a protein, a formaldehyde-setting dye, and an insolubilizing agent such as formaldehyde which subsequently to the coating operation renders both the protein and the dye insoluble in water and organic solvents.  Alternatively, a solution of a protein and a formaldehyde-setting dye may be applied to the fibres and the coating may be subsequently rendered insoluble by treatment with formaldehyde.  The protein may be gelatine, glue, plasticised glue, pectin, or albumin.  The treatment may be applied to yarns, fibres, strands, or fabrics of glass.  The composition may be applied to fibres immediately after they are formed from molten glass. Cation-active amine compounds, oils, or waxes may be incorporated in the composition in order to lubricate the glass fibres.  Octadecyl stearyl ammonium acetate, cetylamine hydrochloride or acetate, stearyl ammonium bromide and methyl benzyl stearyl sulphonium methyl sulphate are specified. In producing the coating composition, the dye may be mixed with water until the lumps have disappeared.  The solution is then heated and the protein is added while stirring.  The solution is heated to boiling point and then cooled.  The amine compound may be added during the cooling step.  Formaldehyde and the remainder of the water required are added when the solution is cool. In an example, the aqueous coating composition contains about 2 per cent of dye, 3 per cent of protein, 0.5 per cent of cation-active amine compound, and 2 per cent of formalin (30-40 per cent solution). The coated glass fibres are not only coloured but they are of reduced capillarity and are particularly suitable for electrical insulation. The capillarity may be further reduced by applying a coating of acetylated polyvinyl acetate or aluminium stearate.ALSO:Glass fibres are coloured by coating them with a composition comprising a protein, a formaldehyde-setting dye, and an insolubilizing agent such as formaldehyde which subsequently to the coating operation renders both the protein and the dye insoluble in water and organic solvents. Alternatively, a solution of a protein and the dye may be applied to the fibres and the coating may be subsequently rendered insoluble by treatment with formaldehyde.  The protein may be glue, plasticized glue, gelatine, pectin, or albumin.  Oils, waxes, or cation-active substances may be included in the composition to lubricate the fibres.  Octadecyl stearyl ammonium acetate, cetylamine hydrochloride or acetate, stearyl ammonium bromide, and methyl benzyl stearyl sulphonium methyl sulphate are specified.  In an example, the aqueous composition comprises about 2 per cent. of a water-soluble dye capable of being rendered insoluble by formaldehyde, 0.5 per cent. of a cation-active compound, and 2 per cent. of formalin (30-40 per cent. solution).  Yarns, fibres, strands, or fabrics may be treated. In preparing the composition, the dye may be mixed with water until the lumps have disappeared; the solution is heated and then the protein is added.  The solution is heated to boiling point and then cooled.  The amine compound may be added during cooling. Formaldehyde and water are added when the solution is cool.  The coated glass fibres are not only coloured but they are of reduced capillarity.  This may be further reduced by coating them with acetylated polyvinyl acetate or aluminium stearate.