Fluorinated acrylic and methacrylic latices and mixtures thereof, processes for their preparation and their use in the field of hydrophobic coatings

摘要

The fluorinated (meth) acrylic latex is comprised of a dispersion of particles or a mixture of dispersions of particles, the dispersion being obtained in one or more stages by emulsion polymerization in an aqueous medium and comprising at least one perfluorinated monomer of formula (I) (S) are used as monofluorinated comonomer (s) for the formation of particles, which is statistically distributed among the particles formed in one step or in the nucleus-envelope The latex being statistically distributed in the outer shell of the core-interlayer (s)-coat type structural particles, said latex comprising at least one dispersion of fluorinated structured particles or at least one dispersion of one or more fluorinated structured particles and / A mixture of a dispersion of the above-described fluorinated statistical particles and a dispersion of at least one non-fluorinated statistical particle , The monomers or monomers of formula (I) are not more than 80% by weight in the shell of the fluorinated structured particles and the ratio of the monomers of formula (I) to the total monomers used to form all the particles of the latex is from 1.8 to 20 %.;(Wherein,-R^OneCH₃Or H;-R²Is fluorinated C_One-C₁₀Alkyl group;-0 n = 4).