Societe D'exploitation De Produits Pour Les Industries Chimiques Seppic

Scott Bader Company Limited

Francois Guy

Olivier Braun

Paul Mallo

Audrey Bonnardel

Michel Barbarin

Jean-Claude Payan

Process for the preparation of a an inverse latex including from 20% to 70% by weight and preferably from 25% to 50% by weight of a branched or crosslinked polyelectrolyte, characterized in that the polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with acrylamide and optionally one or more monomers chosen from monomers containing a partially or totally salified weak acid function and/or from neutral monomers other than acrylamide, the production process including the control of the pH in the initial aqueous phase; Cosmetic, dermopharmaceutical or pharmaceutical composition including the inverse latex directly obtained by the process.

Process for the preparation of inverse latex of acrylamide-based polymers and composition comprising said latex

Process for the preparation of a composition including an oil phase, an aqueous phase, at least one emulsifying system of water-in-oil (W/O) type, optionally at least one emulsifying system of oil-in-water (O/W) type, in the form of an inverse latex including from 20% to 70% by weight and preferably from 25% to 50% by weight of a branched or crosslinked polyelectrolyte, characterized in that the polyelectrolyte is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid partially or totally salified with acrylamide and optionally one or more monomers chosen from monomers containing a partially or totally salified weak acid function and/or from neutral monomers other than acrylamide, the production process being characterized in that the preparation of the aqueous phase includes the dissolution in the aqueous medium of solid 2-acrylamido-2-methyl propanesulfonic acid before neutralization. Cosmetic, dermopharmaceutical or pharmaceutical composition including the inverse latex directly obtained by the process.

A composition useful as a filler for optical fiber cables comprises: a) from 75% to 95% and preferably from 85% to 95% by weight of a compound having a molecular weight of less than 3000 and the formula (I)

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Launaguet, France

Francois Guy