Stable dispersion of positively charged polyfluorocarbon resin particles
AssigneeAkzo N.V.
InventorsKees Helle, Robert C. Groot
Life of this patent
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Abstract
An aqueous stable dispersion of positively charged polyfluorocarbon resin particles having a particle size of less than about 10 .mu.m contains both a cationic and a nonionic fluorocarbon surfactant in a molar ratio between 25:1 and 1:3.5 and in a total amount of at least 3.times.10.sup.-3 millimoles per m.sup.2 of surface area of said particles. The fluorocarbon surfactants give the dispersions storage-stability even in the presence of a strong electrolyte and make them suitable for use in electroplating baths.
Claims13
A stable dispersion of positively charged polyfluorocarbon resin particles, and, if desired, particles of a different material, which resin particles have an average particle size of less than about 10 .mu.m, which dispersion contains a cationic fluorocarbon surfactant and a nonionic surfactant, wherein:
- (a) the nonionic surface active compound is a fluorocarbon compound;
- (b) the molar ratio between the cationic surface active compound and the nonionic surface active fluorocarbon compound is between 25:1 and 1:3.5;
- (c) the total amount of surface active fluorocarbon compounds is at least 3.times.10.sup.-3 mmoles per m.sup.2 of surface area of the polyfluorocarbon particles.
A process for preparing a stable dispersion of positively charged polyfluorocarbon resin particles, and, if desired particles of a different material, which resin particles have an average particle size of less than about 10 .mu.m, by incorporating therein a cationic fluorocarbon surfactant and a nonionic surfactant wherein
- (a) for the nonionic surface active compound a fluorocarbon compound is used;
- (b) the molar ratio between the cationic surface active compound and the nonionic surface active fluorocarbon compound is chosen between 25:1 and 1:3.5;
- (c) the total amount of surface active fluorocarbon compounds is at least 3.times.10.sup.-3 mmoles per m.sup.2 of surface area of the polyfluorocarbon particles.
An aqueous electroplating bath containing dispersed positively charged polyfluorocarbon resin particles having an average particle size of less than about 10 .mu.m stablized against settling of the particles with a mixture containing both a cationic fluorocarbon surfactant and a nonionic surfactant which is a perfluorinated polyoxyethylene having 2-18 ethylene oxide group in a molar ratio of from 25:1 to 1:3.5 with the total amount of fluorocarbon surfactant being at least 3.times.10.sup.-3 m moles per square meter of surface area of said particles.
Dependencies are inferred from the claim text.