Surfactants to create dispersions in fluorinated liquids

U.S. Patent Number: 5844034

Abstract: This invention provides a fluoropolymer dispersion useful for coating applications. The dispersion is a homogeneous and non-ozone depleting dispersion comprising a lubricious fluoropolymer, an inert perfluorinated liquid, a polar solvent, and an effective amount of a surface active agent selected from the group consisting of a. perfluoroaliphatic amidoalkanols; b. polymerized products formed from the reaction of a mixture comprising a hydrophilic monomer and a monomer of the general formula: ##STR1## wherein p and q are integers between 1 and 4 inclusive, x and y are integers between 0 and 4 inclusive, m is 1 or 2, n is an integer between 3 and 10 inclusive, X' is either a methyl group or a single hydrogen atom, g is 0 or 1, and Q is a sulfonamido constituent group according to the formula: ##STR2## wherein R.sup.1 is a hydrogen or a lower alkyl group having from 1 to 6 carbon atoms and wherein the hydrophilic monomer is present in an amount constituting inclusively between five and twenty-five weight percent of the reactant mixture when the polar solvent employed is a polar organic solvent and wherein the hydrophilic monomer is present in an amount constituting inclusively between one and twenty-five weight percent of the reactant mixture when the polar solvent employed is water; and c. Perfluorinated ether acids according to the general formula: ##STR3## wherein z is between 1 and 10 inclusive, s is between 0 to 4, t is between 0 to 4, v between 0 to 5, w is 0 or 1, and Y is either F or CF.sub.3.

Inventors: Grenfell; Mark W. (Woodbury, MN), Flynn; Richard M. (Mahtomedi, MN), Savu; Patricia M. (Maplewood, MN)

Assignee: Minnesota Mining and Manufacturing Company (St. Paul, MN)

Application Number: 08/847,192

Issued: 1998-12-01

Expired: 2006-12-01

Classes: 524/462 ; 524/243; 524/244; 524/366; 524/368; 524/379; 524/385; 524/520; 524/544; 524/545; 524/546

Field of search: 252/182.15,308,311,351,352 524/243,244,366,368,379,385,463,520,544,545,546,462

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