Essilor International (compagnie Generale D'optique)

Essilor International (compagnie General D'optique)

Essilor International

Pascale Tardieu

Jean-Paul Cano

Sylvette Maisonnier

Robert Guglielmetti

Bernadette Charleux

Jean-Pierre Vairon

Anne Robert

Steven Weber

Georges H Wajs

Hoa Thien Dang

Nathaly Vassal

Nathalie Lelard

Eric Glen Johnson

Sidney Shaw White Jr

Kimberly Denise Oliver

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

Process for obtaining a photochromic latex

Method for obtaining a stabilized photochromic latex, latex obtained, and application to ophthalmic optics

Process for the manufacture of a substrate made of transparent organic

The invention relates to novel photochromic compounds of the family of indolino-spiro-oxazines, these compounds being distinguished by the fact that they correspond to the formula of an indolino-spiro-benzo-cyclodiazene.

Photochronic compounds of the indolino-spiro-benzoxazine type

The new photochromic compounds of the invention have the formula of a indolino-spiro-oxazine comprising an indolinic part and an oxazine part wherein the oxanine part comprises an unsaturated 6-atoms bi-aza heterocycle of the pyrimidine type included in a nucleus of the quinazoline part. Preferred photochromic compounds are those showing the following developed formula (II) wherein

Indolino-spiroquinoxalino oxazine photochromatic compounds, methods for

The new photochromic compounds of the invention have the formula of an indolino-spiro-oxazine comprising an indolinic part and an oxazine part, wherein said oxazine part comprises an unsaturated heterocycle with 5 links which comprises one or several atoms selected from nitrogen and sulphur. Preferably the heterocycle is orthocondensed with a benzenic ring of the oxazine part of the compound, and said heterocycle comprises an imine C.dbd.N-bond. The ozazine part may typically be comprised of a benzothiazol-oxazine group of of an indolino-oxazine group.

Indolino-spiro-oxazine photochromic compounds with five-membered rings,

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Pascale Tardieu