Patent GB-892379-A (GB)
Title: Process for the modification of polyamide fibrous materials
Inventor: GROVES LEONARD HARRISON
IPC: D06M13/358
Filed: 1958-05-02
Abstract: Synthetic polyamide fibrous materials are treated with an aqueous solution or suspension of a non-dyestuff non-fluorescent halogeno-1:3:5-triazine derivative.  The treating bath preferably contains a water-soluble thiocyanate, particularly an alkali-metal or ammonium thiocyanate.  The triazine derivative contains at least one halogen atom attached to at least one triazine ring and also contains at least one organic radical attached to a triazine ring through a carbon, nitrogen, oxygen or sulphur atom, which radical may bear at least one solubilizing group which may be negatively or a positively charged salt-forming group or may be a non-ionic group.  The treatment bath may be neutral, alkaline or acid and is preferably at a temperature between 50 DEG C. and its boiling point.  Alkalinity may be produced by the addition of sodium carbonate, bicarbonate or borate and acidity by the addition of ammonium acetate or sulphate, or formic or sulphuric acid.  Neutral salts such as sodium chloride or sulphate and/or surface active agents may also be added to the treatment baths.  Examples of triazine derivatives which may be used are sodium 2-(4:6-dichloro-1:3:5-triazin-2-yl) aminonaphthalene-6-sulphonate, 2-o-chloro-anilino-4:6- dichloro-1:3:5-triazine and 2:4-dianilino-6-chloro 1:3:5-triazine.  A list is given of other triazine derivatives which may be used.  In an example, 100 parts of nylon fabric are treated for one hour at 95 DEG C. in 5,000 parts of water containing 2,5 parts of the first of the above triazines and 1,25 parts of potassium thiocyanate.  The fabric is then rinsed in water at 60 DEG C. and dried.  The treatment alters the dyeing properties of the fibrous materials, e.g. reduces their uptake of acid wool dyestuffs, and improves their thermal stability and resistance to photochemical degradation.ALSO:Synthetic polyamide fibrous materials are treated with an aqueous solution or suspension of a non-dyestuff non-fluorescent halogeno-1 : 3 : 5-triazine derivative.  The treating bath preferably contains a water-soluble thiocyanate, particularly an alkali metal or ammonium thiocyanate. The triazine derivative contains at least one halogen atom attached to at least one triazine ring, and also contains at least one organic radical attached to a triazine ring through a carbon, nitrogen, oxygen or sulphur atom, which radical may bear at least one solubilising group which may be a negatively or a positively charged salt-forming group or may be a non-ionic group.  The treatment bath may be neutral, alkaline or acid and is preferably at a temperature between 50 DEG C. and its boiling point.  Alkalinity may be produced by the addition of sodium carbonate, bicarbonate or borate and acidity by the addition of ammonium acetate or sulphate, or formic or sulphuric acid.  Neutral salts such as sodium chloride or sulphate and/or surface active agents may also be added to the treatment baths.  Examples of triazine derivatives which may be used are sodium 2 - (4 : 6 - dichloro - 1 : 3 : 5 - tri - azine - 2 - yl) amino - naphthalene - 6 - sulphonate, 2 - o - chloro - anilino - 4 : 6 - dichloro - 1 : 3 : 5 - triazine and 2 : 4 - dianilino - 6 - chloro - 1 : 3 : 5 - triazine.  A list is given of other triazine derivatives which may be used.  In an example, 100 parts of nylon fabric are treated for one hour at 95 DEG C. in 5,000 parts of water containing 2.5 parts of the first of the above triazines and 1.25 parts of potassium thiocyanate.  The fabric is then rinsed in water at 60 DEG C. and dried.  The treatment alters the dyeing properties of the fibrous materials, e.g. reduces their uptake of acid wool dyestuffs, and improves their thermal stability, electrostatic properties and resistance to photochemical degradation.