Solvay (Societe Anonyme)

Solvay & Cie

Xavier Bacque

Yves Vanderveken

Vincent Bodart

Fredy Declerck

Guy Laurent

Thierry Lannuzel

Bernard Guenaire

Pierre Lasson

The invention relates to a process for the preparation of an aqueous dispersion of halogenated vinyl polymers by polymerization, according to which, after polymerization, a basic agent is added in an amount such that the pH of the aqueous dispersion is less than approximately 5. The invention also relates to the aqueous dispersion obtained, which can be coated onto polymeric substrates made of paper or of regenerated cellulose.

Process for the preparation of an aqueous dispersion of halogenated vinyl polymers involving a basic after-treatment

The invention relates to a process for the preparation of an organic solution of dialkyl peroxydicarbonate which is particularly suited for use in the aqueous suspension polymerization of halogenated monomers. The dialkyl peroxydicarbonates are employed in the aqueous suspension polymerization of halogenated monomers in the form of an organic solution in a water-insoluble organic solvent chosen from conventional chain-regulating agents for halogenated polymers.

Organic solution of dialkyl peroxydicarbonate, process for producing it, preparation of halogenated polymers with the involvement of this solution and halogenated polymers obtained

The invention relates to a process for the preparation of an organic solution of dialkyl peroxydicarbonate which is particularly suited for use in the aqueous suspension polymerization of halogenated monomers. According to this process, the dialkyl peroxydicarbonate, prepared by the reaction in water of appropriate amounts of alkyl haloformate with an inorganic peroxide, is separated by extraction by means of a water-insoluble organic solvent chosen from conventional chain-regulating agents for halogenated polymers.

Organic solution of dialkyl peroxydicarbonate and process for producing thereof

Process for the manufacture of vinylidene fluoride polymers by noncontinuous polymerization of vinylidene fluoride in an aqueous medium with the use of peroxydisulphates as initiators and in the absence of emulsifying agent, in which an alkyl acetate, employed as a chain-control agent, is introduced into the initial aqueous charge intended for the polymerization. Use of the resulting vinylidene fluoride polymers for the manufacture of paints and, more particularly, of paints intended for prelacquering metal sheets with improved gloss.

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Tavaux, France

Xavier Bacque