Process for conveniently providing stain-resistant polyamide carpets
AssigneeMonsanto Company
InventorsPompelio A. Ucci, Randolph C. Blyth
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Abstract
The invention relates to an improvement in certain processes for continuously dyeing polyamide carpets whereby stain resistance is imparted to the carpets during the dyeing process. The improvement involves adding an alkali metal silicate (e.g. sodium meta silicate) and a sulfonated phenol-formaldehyde condensation product to the dye liquor used in the dyeing process. If either the silicate or condensation product is omitted from the liquor, the improvement is not achieved. The improvement provides a convenient and economical means for providing stain resistant polyamide carpets.
Claims10
In a process for continuously dyeing a carpet having a pile consisting essentially of polyamide fibers wherein an endless length of the carpet is passed through a treating zone in which the carpet is first prewetted, then treated with an aqueous dye liquor wherein the liquor ratio is in the range of 1.5:1.0 to 4.5:1.0, then, subjected to an atmosphere of steam to fix the dye on the carpet, then washed with water to remove residual liquor from the carpet and, finally, dried, the improvement of imparting stain resistance to the carpet comprising adding a silicate of the formula M.sub.2 O.mSiO.sub.2 and either a sulfonated phenol-formaldehyde condensation product or a sulfonated naphthol-formaldehyde condensation product or mixtures thereof to the liquor each in an amount sufficient in combination to impart stain resistance to the carpet, where M is an alkali metal and m is a number ranging from about 0.5 to 2.0.
Dependencies are inferred from the claim text.