Process for making fluoropolymer finish composition
AssigneeE. I. Du Pont de Nemours and Company
InventorHarvey P. Tannenbaum
Life of this patent
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Abstract
In the formation of a fluoropolymer non-stick layer on a substrate such as of cookware and bakeware, improved adhesion of the layer is obtained by co-grinding at least the polymer binder component with the pigment component. In an aqueous system, this co-grinding is carried out in water which contains a surfactant and the polymer binder is soluble in the water or water organic solvent mixture the resultant co-ground aqueous dispersion/solution is blended with aqueous dispersion of fluoropolymer to form the coating composition. Addition of inorganic filler film hardener to the co-grinding step also improves the scratch resistance of the of the non-stick layer.
Claims15
Process for preparing an aqueous fluoropolymer coating composition for application to a substrate and baking to cause the composition to fuse into a layer adhering to the substrate, comprising intimately mixing of aqueous dispersion of pigment with aqueous solution of polymer binder by co-grinding said dispersion and solution together and mixing the resultant co-ground dispersion and aqueous dispersion of fluoropolymer one with the other to form said composition.
Process for preparing an organic solvent based fluoropolymer composition for application to a substrate and baking to fuse the composition to a layer which adheres to said substrate, comprising co-grinding said fluoropolymer with pigment, inorganic filler film hardener, and polymer binder in said organic solvent to obtain said composition as an intimate mixture.
Dependencies are inferred from the claim text.