Solvay (Societe Anonyme)

Solvay Sa

Solvay

Guy Laurent

Fredy Declerck

Vincent Thulliez

Yves-Julien Lambert

Vincent Bodart

Jean-Marie Oreins

Xavier Bacque

Thierry Lannuzel

Bernard Boutevin

Alexandra Malinova

Nadia Torres

Multilayer polymer structures comprising a layer (A) based on at least one halohydrocarbon polymer linked to a layer (C) based on at least one olefin polymer via a layer (B) containing from 100% to 10% by weight of at least one grafted olefin polymer and from 0 to 90% by weight of at least one halohydrocarbon polymer, the grafted olefin polymer being obtained by grafting a polymerizable monomer, a functional oligomer or a functional telomer onto a preactivated olefin polymer; process for obtaining them and use thereof.

Structures with multiple polymeric layers

Crosslinkable vinylidene fluoride polymer composition, process for crosslinking the composition and shaped articles

Polymeric adhesive and structures with multiple polymeric layers, their process of preparation and their use

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

Polymeric adhesive comprising a homogeneous mixture of at least three constituents: (a) at least one thermoplastic halogenated hydrocarbon polymer, (b) at least one copolymer of monoethylenic monomers which carry an alkyl carboxylate functional group and (c) at least one alpha-olefin polymer modified by the incorporation of at least one functional group chosen from a carboxyl, an acid anhydride, a hydroxyl and an epoxide. Process for the preparation of this polymeric adhesive and use of this polymeric adhesive in the preparation of structures with multiple polymeric layers. Structures with multiple polymeric layers comprising a layer (A) based on thermoplastic halogenated hydrocarbon polymer bonded to a layer (C) based on thermoplastic nonhalogenated polymer incompatible with (A) via a layer (B) based on this polymeric adhesive. Process for the preparation of these structures with multiple polymeric layers and use of these structures with multiple polymeric layers in the preparation of pipes, tubes, films, sheets, panels or hollow bodies which can be used in particular in the automobile field.

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

Composition which can be crosslinked under the effect of an ionizing radiation comprising a thermoplastic copolymer of vinylidene fluoride and of chlorotrifluoroethylene and an effective amount of a crosslinking promoter, such as a triallyl cyanurate or triallyl isocyanurate. Process for the crosslinking by irradiation of the crosslinkable composition under air by means of an ionizing radiation, such as .beta.-radiation, at a dose of 10 to 100 kGray. Crosslinkable and crosslinked shaped articles, such as sheaths for electrical cables and pipes for oil products.

Crosslinkable vinylidene fluoride polymer composition, process for

The compositions based on copolymers of vinylidene fluoride and of ethylenically unsaturated fluorine-containing comonomers, containing at least 75% by weight of vinylidene fluoride include polyvinyl chloride and an effective quantity of a methacrylic polymer (producing compatibility). These compositions exhibit in particular improved dielectric properties, which makes them particularly advantageous for sheathing electrical cables.

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Vedrin, Belgium

Guy Laurent