Process for coating fabrics with fluorochemicals
AssigneeMonsanto Company
InventorsGeorge R. McLellan, Chester C. Wu
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Abstract
A process for coating carpets with fluorochemical emulsions is disclosed. The process comprises treating the fabric with a fluorochemical emulsion then heating, rinsing and, finally, drying the treated fabric. The process is characterized in that the emulsion has a pH and divalent metal ion concentration sufficient to effect transfer of the fluorochemical from the emulsion to the carpet during the heating step.
Claims8
In a process for coating pile fibers of a carpet with fluorochemical particles wherein an emulsion comprising fluorochemical particles is applied to the carpet and then the carpet is dried to remove water and leave said particles thereon as a coating, the improvement of transferring fluorochemical from said emulsion onto said carpet comprising the preliminary step of adding a water-soluble salt of a divalent metal to said emulsion and the additional steps of heating and rinsing the carpet with water after the emulsion is applied thereto and before the carpet is dried, wherein the pH of said emulsion, the divalent metal ion concentration of said emulsion and the period of time and temperature at which said heating step is carried out are selected whereby a greater percentage of said fluorochemical particles is transferred from said emulsion onto said carpet than if said preliminary step and said heating are omitted.
Dependencies are inferred from the claim text.