Soil-repellent coating compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorWilliam John Chambers
Life of this patent
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Abstract
Aqueous dispersions are disclosed containing up to 50% of particulate solids having a particle size less than 1.mu. and consisting essentially of A. 4 parts by weight of particles of hydrous metal oxides such as silica, alumina or aluminum-modified silica, and B. from 1 to 16 parts by weight of particles of a polymer containing from 0.5% to 92% by weight of --CF.sub.3 groups, and preferably having a Knoop hardness of at least 5. The dispersions can be used to coat fabrics, painted surfaces and the like to enhance soil repellancy.
Claims8
An aqueous dispersion containing a dispersant and 0.5% to 50% by weight of solid particles having a size less than 1.mu., said particles consisting essentially of
- a. 4 parts by weight of hydrous metal oxide particles,
- b. from 1 to 16 parts by weight of polymer particles containing --CF.sub.3 groups in an amount of from 0.5% to 92% by weight of said polymer, said polymer being a polymer of acrylic or methacrylic acid esterified with a fluorinated alcohol containing 2 to 12 carbon atoms and 1 to 3 --CF.sub.3 groups, and having a Knoop hardness in bulk of at least 5.
Dependencies are inferred from the claim text.