GB493920A - Rendering wool and silk water-repellent - Google Patents

Abstract

Wool, including chlorinated wool and artificial wool made from proteins such as casein, and silk are made water-repellent by impregnating them with a quaternary ammonium salt of the formula <FORM:0493920/IV/1> and subsequently heating, preferably after previous drying, to a temperature such that the salt is decomposed. In the formula R is an aliphatic radical of at least 12 carbon atoms which may be a saturated or unsaturated hydrocarbon radical or a radical of the formula R1-CO wherein R1 is an aliphatic hydrocarbon radical of at least 11 carbon atoms; X is oxygen, sulphur or an amino or substituted imino group; <FORM:0493920/IV/2> represents the residue of an aliphatic or heterocyclic tertiary base; and Y is the monovalent anion of an acid, e.g. of hydrochloric, hydrobromic, nitric, sulphuric, oxalic or p-toluene sulphonic acids. Suitable salts include stearamidomethylpyridinium chloride, lauramidomethylpyridinium pyridine sulphate, N - carbomethoxyheptadecylaminomethyl pyridinium chloride, octadecyloxy methyl pyridinium chloride, stearomethylamidomethylpyridinium chloride, stearamidomethylpyridinium pyridine sulphite, stearamidomethylpyridinium pyridine sulphate, stearamidomethylpyridinium bromide, stearamidomethylpyridinium nitrate, oleylamidomethylpyridinium chloride, octadecyloxymethyl benzyl piperidinium chloride, cetyloxymethylpyridinium chloride, octadecyloxymethylpyridinium iodide, octadecyloxymethylpyridinium acid oxalate, octadecyloxymethylpyridinium nitrate, cetyloxymethylpyridinium acid oxalate, octadecyloxymethylquinolinium chloride, octadecyloxymethyltriethanolammonium chloride, cetyloxymethylhexamethylene tetrammonium bromide, and mixtures of cetyloxymethylpyridinium pyridine sulphite and cetyloxymethylpyridinium pyridine pyrosulphite. Methods of making such salts are described in Specifications 471,130, 475,119, 475,170, and 488,869. The quaternary salt may be applied as a dispersion or solution in aqueous or organic solvents such as ethanol and toluene. The baking temperature may be 90-150 DEG C. Mildly alkaline agents, especially those having a buffering action, such as borax, hexamethylene tetramine, magnesium hydroxide, pyridine and aniline, or acidic substances such as sulphuric, hydrochloric, phosphoric or acetic acids or sodium dihydrogen phosphate, may be added to the bath. The treated material is stated to acquire a soft handle, improved draping properties or altered dyeing properties. In the case of dyed or printed materials there may be a fixative action on the dyestuffs.