Essilor International (compagnie Generale D'optique)

Other

Huels Aktiengesellschaft

Thomson-csf

Elf Atochem S.a.

Jean-Pierre Vairon

Marcel Jozefowicz

Peter Ottersbach

Veronique Migonney

Bernadette Charleux

Frank F Hill

Graciella Djavid

Jean-Paul Cano

Pascale Tardieu

Sylvette Maisonnier

Rosangela Pirri

Pierre Le Barny

Dominique Baude

Georges H Wajs

Sandrine Denie

Laurent Bouteiller

Muriel Lansalot

Britta Mensing

Nathaly Vassal

Brigitte Marchin

Philippe Chaumont

Jo&euml;l Steiner

Marine-Anne Dourges

By Friedrich Frank Hill

By Regina Luise Hill

The method of the invention comprises: a) forming a hydrophilic polyurethane prepolymer with isocyanate end groups, by the polyaddition reaction of at least one polyol and at least one diisocyanate in the presence of at least one internal emulsifying agent; b) mixing the polyurethane prepolymer with a photochromic agent; c) adding water or a mixture of water and solvent, under agitation, to the mixture of the polyurethane prepolymer and the photochromic agent, to form an emulsion; and d) adding at least one chain extension agent to the emulsion and performing a chain extension reaction to give the final photochromic polyurethane latex. Application to the production of ophthalmic articles having photochromic properties.

Method for preparing a photochromic polyurethane latex and application to ophthalmic optics

This invention relates to a method for preparing a photochromic latex, photochromic thin films obtained therefrom, and articles coated with such thin films, in particular photochromic ophthalmic lenses.

Method for preparing a latex with photochromic properties and uses thereof, particularly in ophthalmology

The invention relates to water-insoluble polymers which promote cell proliferation, contain carboxylate and sulfonate groups and are obtainable by free radical copolymerization of one or more aliphatically unsaturated monomers containing carboxylate groups, or the correspondingly functionalized derivatives of the monomers, as component I with one or more aliphatically unsaturated monomers containing sulfonate groups, or the correspondingly functionalized derivatives of the monomers, as component II and a component III which comprises an aliphatically unsaturated monomer or several aliphatically unsaturated monomers, the correspondingly functionalized derivatives being converted into carboxylate and sulfonate groups after the copolymerization, and to a process for their preparation, wherein the polymers are useful for forming articles which promote cell proliferation.

Carboxylate-sulfonate polymers

Preparation of carboxylate-sulfonate polymers having cell proliferation-promoting properties

A process for the emulsion polymerization in the presence of a stable free radical of at least one monomer which can be polymerized by the radical route, which emulsion comprises a liquid aqueous phase and a liquid organic phase, the aqueous phase comprising at least 50% by weight of water and the liquid organic phase comprising more than 50% by weight of monomer(s) to be polymerized. The invention results, by a rapid controlled polymerization process, in a latex of polymer particles, it being possible for the polymer to comprise acrylate and/or methacrylate blocks.

Emulsion polymerization in the presence of a stable free radical

Bioactive surface coating

The invention relates to water-insoluble, bacteriophobic and optionally cell proliferation-inhibiting polymers obtainable by free-radical polymerization of (a) at least one monomer of the general formula R&mdash;(A),, in which R is an aliphatically unsaturated organic radical with the valence a, A is a carboxyl group &mdash;COOH, sulfuric acid group &mdash;OSO,OH, sulfonic acid group &mdash;SO,H, phosphoric acid group &mdash;OPO(OH),, phosphonic acid group &mdash;PO(OH),, phosphorous acid group &mdash;OP(OH),, a phenolic hydroxyl group or a salt of one of the groups, and a is 1, 2 or 3, with the proviso that, if the monomer of the formula I contains a carboxyl group &mdash;COOH or a carboxylate group, either this monomer contains at least one further radical A having a different one of the definitions specified for A, or at least one further monomer of the formula I is also used in which A has a different one of the definitions specified for A; and (b) at least one other aliphatically unsaturated monomer, wherein the polymers are useful for forming bacteriophobic or cell proliferation-inhibiting articles.

Water insoluble bacteriophobic polymers containing carboxyl and sulfonic acid groups

This invention pertains to a process for the manufacture of a hydrophilic polymeric product, consisting in causing a material comprising a crosslinked silicone polymer matrix and photoinitiator groups dispersed and immobilized within the polymer matrix to swell in a swelling solution comprising a solvent for swelling the crosslinked silicone polymer of the matrix of the material, a photopolymerizable hydrophilic monomer and optionally a crosslinking agent and a proton- or electron-donating coinitiator compound, when the material comprises photoactivable photoinitiator groups and does not comprise proton- or electron-donating coinitiator groups causing the photopolymerizable hydrophilic monomer to diffuse into the swollen material, and polymerizing, by irradiation, the photopolymerizable hydrophilic monomer.

Material based on crosslinked silicone polymer comprising an attached photoinitiator, process for the preparation thereof, hydrophilic polymeric product obtained from this material and process for the preparation thereof, and novel photoinitiators

Disclosed is an original method for preparing composite materials for a display screen, these materials containing a polymer, liquid crystal and dye. The present problem is one of inserting molecules of dye into composites of this type. The disclosed method proposes the preparation, in a first step, of a porous film of reticulate polymer. Then, molecules of liquid crystal (XL) and molecules of dye (C) are made to diffuse therein by a polymer-expanding solvent. After evaporation of the solvent, a film of polymer is obtained with inclusions containing liquid crystal (XL) and dye (C) with a wide range of concentrations in liquid crystal, thus making it possible to optimize the performance characteristics in terms of contrast and control voltage of the screen thus made.

Method for obtaining composite materials based on polymers and liquid

Growing community of inventors

Bourg la Reine, France

Jean-Pierre Vairon