Process to improve resistance to stains on fibres and derived products
AssigneeN. V. Denderland-Martin
InventorArmand De Lathauwer
Life of this patent
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Abstract
The invention consists of a process to improve the resistance to stains on fibres, processed or not, finished or not on the basis of dyeable natural or synthetic fibres, in particular polyamide. According to the invention the fibres are treated with a solution containing tannic acid and a condensation product of a sulphonated phenol- or naphtol-derivate with an aldehyde. The treatment can be made before, during or after the dyeing process. The treatment is done in an acid medium.
Claims22
Method for improving the stain resistance of a substrate made out of dyed or dyeable natural or synthetic fibres, said method comprising contacting the substrate in acid medium with tannic acid and with sulphonated phenol- or naphthol-aldehyde condensation product, the amounts of tannic acid and sulphonated product each being in the range of 10 to 90 percent, based on the total weight of said tannic acid and sulphonated product, and producing improved stain resistance in said substrate through such contacting.
A substrate of natural or synthetic fibers having improved stain resistance as compared to that of the untreated substrate, said substrate having been
- (a) treated with tannic acid and sulfonated phenol- or naphthol-aldehyde condensation product, in amounts sufficient to improve the stain resistance of the substrate;
- and
- (b) colored by application of dyestuff prior to, during or after treatment of the substrate with said tannic acid and sulphonated product.
A substrate with improved stain resistance as compared to that of the untreated substrate, said substrate of improved stain resistance being a product of the process of treating a substrate made of dyed or dyeable natural or synthetic fibres, in acid medium, with tannic acid and with sulphonated phenol- or naphthol-aldehyde condensation product, the amounts of tannic acid and sulphonated product each being in the range of 10 to 90 percent, based on the total weight of said tannic acid and sulphonated product.
An improved method of cleaning a colored substrate, wherein the improvement comprises:
- pretreating said colored substrate, in an acidic medium prior to the presence of a given stain on said substrate, with tannic acid and sulphonated phenol- or naphthol-aldehyde condensation product, the amounts of tannic acid and sulphonated product each being in the range of 10 to 90 percent based on the total weight of said tannic acid and sulphonated product;
- and
- cleaning said stain from the pretreated substrate.
A solution for improving the stain resistance of a substrate, said solution containing tannic acid and sulphonated phenol- or naphthol-aldehyde condensation product, the amounts of tannic acid and sulphonated product each being in the range of 10 to 90 percent, based on the total weight of said tannic acid and sulphonated product.
Method for producing a colored substrate of natural or synthetic fibres having improved stain resistance, said method comprising
- (a) contacting the substrate with tannic acid and sulphonated phenol- or naphthol-aldehyde condensation product at a combined weight concentration of 1-6% in aqueous acid medium, the amounts of tannic acid and sulphonated product each being in the range of 10 to 90 percent, based on the total weight of said tannic acid and sulphonated product, the total of said amounts being sufficient to improve the stain resistance of the substrate,
- (b) coloring said substrate with dye applied during or after contacting said substrate with said tannic acid and sulphonated product, and
- (c) recovering a product of improved stain resistance as compared to a similarly dyed product not contacted with said tannic acid and sulphonated product.
Dependencies are inferred from the claim text.