Elf Atochem S.a.

Atofina

Bruno Feret

Isabelle Betremieux

Jean-Jacques Flat

Didier Vanhoye

Christophe Verge

Christophe Dumousseaux

Laure Sarrazin

The invention concerns a method for obtaining an aqueous dispersion of hydrophobic polymers dispersed in the form of particles with mean diameter less than 100 nm stablized soley with a macromolecular surfactant based on low molecular weight styrene/maleic anhydride imide copolymer. The invention also concerns the use of said dispersion for treating and sizing paper.

Hydrophobic cationic dispersions stabilized by low molecular weight maleimide copolymers, for paper sizing

Finely particulate composite latices and use thereof in solvent-free

High-performance overprint varnishes, well-suited for the protective coating of a wide variety of substrates, e.g., papers, cardboards and packaging materials, include a composite latex and characteristically a polyethylene wax emulsion, the composite latex comprising the copolymerizate of at least one hydrophobic monomer within an aqueous solution of a styrene/maleic anhydride resin, the styrene/maleic anhydride resin having a molecular weight ranging from 500 to 5,000 and an acid number of at most 500, and the amount by weight of the styrene/maleic anhydride resin in the copolymerizate ranging from 5% to 50%.

High-performance overprint varnishes comprising composite SMA latices

This fluorinated (meth)acrylic latex consists of a dispersion of particles or of a mixture of dispersions of particles, these dispersions being obtained by emulsion polymerization in an aqueous medium, in at least one stage, wherein one more perfluorinated monomer(s) of formula (I) has/have been used as sole fluorinated comonomer(s) for the formation of the particles, and which is/are distributed statistically in particles formed in one stage or distributed statistically in the shell of structured particles of the core-shell or core-intermediate layer(s)-shell type resulting from a polymerization in two stages and in more than two stages, respectively, the said latex consisting of a dispersion of the said structured particles or of a mixture of at least one dispersion of the said fluorinated structured particles and/or at least one dispersion of the said fluorinated statistical particles and at least one dispersion of unfluorinated statistical particles, the monomer or monomers of formula (I) representing less than 80% by weight of the shell of the fluorinated structured particles, the proportion of monomers of formula (I) relative to the collective monomers used to form all of the particles of the said latex being between 1.8 and 20% by weight. ##STR1## R.sup.1 .dbd.CH.sub.3 or H; R.sup.2 =perfluorinated C.sub.1 -C.sub.10 alkyl; and 0&lt;n.ltoreq.4.

Fluorinated acrylic and methacrylic latices and mixtures thereof,

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Levallois, France

Bruno Feret