Water and oil repellent masonry treatments
Assignee3M Innovative Properties Company
InventorsWayne W. Fan, Steven J. Martin
Life of this patent
Estimating the term…
Abstract
The present invention provides a water-soluble and shelf-stable aqueous fluorochemical polymeric treatment useful to treat porous substrates to render them repellent to water- and oil-based stains. The treatment comprises a water-soluble or dispersible fluorochemical polymer containing only carbon atoms in the backbone, with a plurality of each of the following groups pendant from the backbone: (a) fluoroaliphatic groups, (b) carboxyl-containing groups, (c) silyl groups and optionally (d) other non-hydrophilic groups. Because the water-soluble polymeric treatment, and the shelf-stable aqueous solutions thereof, can be applied to porous substrates in aqueous solution, they eliminate the need for environmentally harmful and toxic co-solvents.
Claims18
An aqueous fluorochemical polymeric composition comprising polymers having interpolymerized units derived from one or more of each of the following monomers:
- (a) monomer selected from the group consisting of acrylate, methacrylate, acrylamide, methacrylamide, thioacrylate and meththioacrylate compounds containing a fluoroaliphatic moiety that is linked to the residue of the compound through a divalent, organic linking group;
- (b) monomer selected from the group consisting of acrylic acid, methacrylic acid, carboxyalkylacrylate and carboxyalkylmethacrylate compounds,
- (c) monomer selected from the group consisting of acrylate, methacrylate, acrylamide, methacrylamide, thioacrylate and meththioacrylate compounds containing an alkoxysilane moiety linked to the residue of the compound through a divalent organic group;
- and
- (d) optionally other monomers containing a non-hydrophilic group.
Dependencies are inferred from the claim text.