Stain and soil resistant compositions having freeze-thaw stability
AssigneeE. I. Du Pont de Nemours and Company
InventorYashavant V. Vinod
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Abstract
The present invention relates to an improved process for preparing a stain and soil resistant aqueous (non-solvent) composition. The resulting composition demonstrates effective freeze-thaw stability.
Claims4
In a process for preparing a composition capable of imparting stain and soil resistance to an installed nylon carpet, said process comprising forming an aqueous dispersion comprising a ratio by weight percent of an aqueous dispersion of perfluoroalkyl ester of citric acid to a solution of hydrolyzed styrene/maleic anhyride copolymer in the range of 10:1 to 1:1, the improvement comprising adjusting the pH level of the total dispersion to a final level of 4.2 to 4.6 to impart freeze-thaw stability to the dispersion.
Dependencies are inferred from the claim text.