Viscosity control for reduced fluorosurfactant aqueous fluoropolymer dispersions by the addition of cationic surfactant
OwnerRobert Cavanaughinventor
Life of this patent
Estimating the term…
Abstract
A stabilized aqueous fluoropolymer dispersion comprising fluoropolymer particles, wherein the dispersion contains less that about 300 ppm fluorosurfactant based on the weight of the dispersion and a cationic surfactant. The cationic surfactant aids in reducing the viscosity of the dispersion and preferred cationic surfactants are volatile in coating or film casting operations involving drying and sintering of the dispersion.
Claims36
A stabilized aqueous fluoropolymer dispersion comprising fluoropolymer particles, said dispersion containing less that about 300 ppm fluorosurfactant based on the weight of said dispersion, said dispersion comprising a cationic surfactant.
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising:
- reducing the fluorosurfactant content of said stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion to a predetermined level;
- and
- adding cationic surfactant to said dispersion.
A process for reducing fluorosurfactant content of a stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion comprising:
- contacting said stabilized fluorosurfactant-containing aqueous fluoropolymer dispersion with an anion exchange resin to reduce fluorosurfactant content to a predetermined level;
- separating said anion exchange resin from said dispersion after the fluorosurfactant content has been reduced;
- and
- adding cationic surfactant to said dispersion.
A process for controlling the viscosity of a stabilized reduced fluorosurfactant aqueous fluoropolymer dispersion comprising:
- adding a cationic surfactant in an amount sufficient to reduce dispersion viscosity to a predetermined level.
Dependencies are inferred from the claim text.