| abstract |
A mixture of at least one acid and at least one metal compound enhance the stain resistance or acid dye fixation and resistance to cold water bleeding of fibrous polyamide and wool substrates, for example, carpets, treated with a water-soluble sulfonated aromatic-aldehyde condensation resin, for example, sulfonated resole and sulfonated novolak type resins; at the same time an improvement in light fastness or non-yellowing is obtained and the durability or wash fastness of the stain resistance is improved; the condensation resin is optionally employed in conjunction with a polymeric methacrylic acid. The acid of the mixture is one or more of phosphoric acid, polyphosphoric acid, citric acid and sulfuric acid; the metal compound is, in particular, a salt of magnesium or copper. |