Atochem

Elf Atochem S.a.

Arkema Inc.

Atofina

Patrick Kappler

Jean-Luc Perillon

Nicolas Krantz

Jacques Grossoleil

Ramin Amin-Sanayei

Mehdi Durali

Jean Blaise

Greylan Burch

Catherine Savary

Véronique Gauthe

Jean Luc Perillon

Marcel Baudrand'

Marcel Baudrand

A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers contain blocks of polyethylene glycol, polypropylene glycol and/or polytetramethylene glycol. The process and fluoropolymer produced contain no fluorinated surfactant. The fluoropolymers have excellent resistance to discoloration.

Aqueous process for making fluoropolymers

The present invention relates to a process for the manufacture of PVDF homopolymer or copolymer by radical polymerization of vinylidene fluoride (VDF), and optionally of a comonomer, in aqueous dispersion and in the presence of a transfer agent, of a persulphate as radical initiator, optionally of a surface-active additive and optionally of a paraffin wax, in which:

Process for the manufacture of thermally stable PVDF

The present invention relates to stable aqueous dispersions comprising one or a number of hydroxylated fluorinated copolymers consisting of vinylidene fluoride and/or of trifluoroethylene, of tetrafluoroethylene, of one or a number of hydroxylated allylic monomers, and optionally of one or a number of monomers chosen from non-hydroxylated vinyl ethers. The stable aqueous dispersions optionally further comprise one or a number of acrylic copolymers consisting of methyl methacrylate and of one or a number of other alkyl (meth)acrylate(s), which are optionally functionalized or substituted. The stable aqueous dispersions are prepared by dispersion in water of an organic solution of the above copolymers and then by removal of the organic solvent. They can in particular be used as binders for aqueous-phase paints or varnishes.

Paints comprising aqueous dispersions of hydroxylated fluorinated copolymers

Improved monodisperse spheroidal particle latices of vinyl chloride polymers, e.g., having particle sizes ranging from 0.17 to 0.8 .mu.m or from 0.5 to 1.2 .mu.m, are produced by aqueous emulsion polymerization of vinyl chloride monomer, whether in a single stage or in two stages, in the absence of surface-active agent, in the presence of at least 0.2% by weight of at least one water-soluble alkali metal or ammonium persulfate initiator, and also in the presence of at least one water-soluble auxiliary compound that is a solvent for vinyl chloride, in such amount that the solubility of vinyl chloride in the aqueous phase at 25.degree. C. at atmospheric pressure is at least 1.5 g/l.

Monodisperse particle latices of vinyl chloride polymers

The invention relates to binders for self-crosslinkable varnishes and paints comprising one or a number of hydroxylated and/or carboxylated fluorinated copolymers and one or a number of epoxidized and/or alkoxylated acrylic copolymers. The varnishes and paints in which these binders are carried out are self-crosslinkable that is to say they do not need any crosslinking agent

Binder for self-crosslinkable varnishes and paints

The invention relates to the use of fluorinated copolymers based on trifluoroethylene (VF3) and tetrafluoroethylene (C.sub.2 F.sub.4), having melting points above 210.degree. C. and soluble in the customary polar solvents, as protective coatings for a variety of substrates (plates, wires, cables, fibers, etc.) in the form of extruded films or sheaths or in the form of varnishes and paints.

Fluorinated polymer having improved heat stability

The present invention provides hardenable fluoridated copolymers that are prepared by (a) copolymerizing tetrafluoroethylene, vinylidene fluoride, and an allylic monomer of the formula ##STR1## wherein R is an unsaturated linear, branched, or cyclic alkyl chain having 2 to 12 carbon atoms, each of R1, R2, R3, and R4 is independently selected from the group consisting of H, CH.sub.3, CH.sub.2 CH.sub.3, OH, and CH.sub.2 OH, n is 0 or 1, and p is a value from 0 to 3, in the presence of a copolymerization initiator and in a solvent medium, and subsequently (b) extracting the copolymer from the reaction medium by precipitation in a liquid that is not a solvent of the copolymer but is miscible with the solvent of the reaction medium. The fluoridated copolymers so prepared are useful in powder form for electrostatic spray coating applications.

Settable fluoridated copolymer in powder form, its method of production,

A settable copolymer containing the copolymerization remnants of a fluoridated monomer and an allylic derivative characterized in that:

Hardenable fluoridated copolymer in powder form and its application in

A hardenable fluorinated copolymer of fluorinated monomers and an acrylamide derivative and paints, paints and varnishes comprising such copolymers, and the process of making such hardenable copolymer.

Hardenable, fluorinated copolymer, process for its manufacture and its

A hardenable copolymer containing copolymerization molecular constituents from a fluorinated monomer and an allylic compound, characterized in that:

Hardenable fluorinated copolymer, the process for making the same, and

A hardenable copolymer containing copolymerization molecular constituents from a fluorinated monomer and from an allylic monomer, characterized in that:

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Ecully, France

Patrick Kappler