Arkema France

Elf Atochem S.a.

Arkema Inc.

Atofina

Thierry Pascal

Anthony Bonnet

Michael Werth

Isabelle Tartarin

Karine Triballier

Barbara Ramfel

Fabrice Chopinez

Bruno Schlund

Christian Bonardi

Fabrice Gilis

The invention concerns a process for the aqueous suspension, micro-suspension, emulsion or micro-emulsion polymerization of at least one halogenated monomer, in particular chlorinated, for example vinyl chloride, by itself or with one or more other vinyl monomers, preferably less than 50% by weight of one or more other vinyl monomers, in which at least one shortstopper and at least one perhalogenate, acting as a whitening agent, are added. The invention also concerns the use of an association of at least one shortstopper and at least one perhalogenate, acting as a whitening agent, in reactions for the polymerization of halogenated monomers. The invention further concerns compositions comprising at least one shortstopper and at least one perhalogenate.

Process for preparing halogenated polymers

Blends of PVDF (polyvinylidene fluoride) homopolymer or copolymer with ABC triblock copolymers are useful for manufacturing parts which may be sheets, film, tubes, rods, centrifugal pump components and containers. The PVDF comprises a fraction of non-transferred chains of very high molar mass which are insoluble in the usual solvents for PVDF, such as DMF (dimethylformamide), DMSO (dimethyl sulphoxide) and NMP (N-methylpyrrolidone), the polymer fraction associated with these high-mass chains having a dynamic viscosity of greater than 50 kpoise at 230&#xb0; C., and at a shear rate of 100 s, and has spherulites with a size between 0.5 and 4&#x3bc;m.

Vinylidene fluoridepolymer having a fraction of non-transferred chains and its manufacturing process

The present invention relates to a process for grafting an unsaturated monomer onto a fluoropolymer, having the steps of: Structures made with these materials are barriers to many fluids and in particular to petrol and to air-conditioning fluids and may be formed into bottles, tanks, containers, pipes, hoses and vessels of all sorts. They may also be converted into films with which packaging is made.

Process for grafting a fluoropolymer and multilayer structures comprising this grafted polymer

Blends of PVDF (polyvinylidene fluoride) homopolymer or copolymer with ABC triblock copolymers are useful for manufacturing parts which may be sheets, film, tubes, rods, centrifugal pump components and containers. The PVDF comprises a fraction of non-transferred chains of very high molar mass which are insoluble in the usual solvents for PVDF, such as DMF (dimethylformamide), DMSO (dimethyl sulphoxide) and NMP (N-methylpyrrolidone), the polymer fraction associated with these high-mass chains having a dynamic viscosity of greater than 50 kpoise at 230&#xb0; C. and at a shear rate of 100 s, and has spherulites with a size between 0.5 and 4 &#x3bc;m.

Vinylidene fluoride polymer having a fraction of non-transferred chains and its manufacturing process

The invention relates to felxible and tough poly(vinylidene fluoride)-based compositions. They comprise from 0.5 to 10 parts by weight of an elastomer B and from 0.5 to 10 parts by weight of a plasticizer C per 100 parts by weight of a homopolymer (A) of vinylidene fluoride (VF2) or of a copolymer (A) of VF2 and of at least one other monomer copolymerizable with VF2, in which the said monomer is present in an amount of between 0 and 30 parts by weight per 100 parts by weight of VF2 with the additional condition that the sum of B and C is from 1 to 10.5 parts by weight and, on the other hand, in that the homopolymer or the copolymer of vinylidene fluoride, A, is chosen in such a way that it has a melt flow index, measured according to the ISO 1133 standard at 230&deg; C. under a load of 5 kg, of less than 5 g/10 min and a critical modulus G , at the intersection of the melt shear moduli G&prime; and G&Prime; measured at 190&deg; C., of between 5 and 22 kPa. In general, they are suitable for producing objects and articles such as sheets, films, sleeves for tubes, pipes, etc., in contact with particularly aggressive substances (such as hydrocarbons, strong acids, solvents, inorganic and organic bases) during which their toughness and flexibility properties are particularly required. (Petroleum and oil industries, chemical engineering, building and civil engineering industries).

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Charly, France

Thierry Pascal