Essilor International (compagnie Generale D'optique)

Essilor International

Fabien Berit-Debat

Claudine Biver

Samuel Archambeau

Bernard Mark Heron

Stuart Aiken

Christopher David Gabbutt

Thomas David Broadbent

Jean-Paul Cano

Christian Bovet

Yves Leclaire

Sandrine Duluard

Frédéric Chaput

Noémie Lesartre

Daniel Luke Crossley

Amélie Kudla

Thomas D Broadbent

Daniel L Crossley

Georgina K Armitage

The present invention relates to a group of novel electrochromic compounds. More specifically, it relates to electrochromic compounds comprising one or several pyridinium rings and the use of these compounds as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

Electrochromic compounds and optical articles containing them

Electrochromic compounds and optical articles containing them The present invention relates to a group of novel electrochromic compounds. More specifically, it relates to electrochromic compounds comprising one or several pyridinium rings and the use of these compounds as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

The invention relates to an optical article comprising a substrate coated with an abrasion and scratch resistant coating composed of a lower layer and an upper layer that do adhere to each other, the upper layer and the lower layer being layers of cured upper and lower layer compositions, said upper layer composition comprising at least one organosilane, or a hydrolyzate thereof, of formula RYSi(X)and at least one compound, or a hydrolyzate thereof, of formula M(Z), the following ratio being lower than 2.3: said lower layer composition comprising at least one organosilane, or a hydrolyzate thereof, of formula R'Y&#x2032;Si(X&#x2032;)and, optionally, at least one compound, or a hydrolyzate thereof, of formula M&#x2032;(Z&#x2032;), the following ratio being higher than 2.3: In the hereabove formulas, M and M&#x2032; are metals or metalloids of valences x and y, at least equal to 4, R and R&#x2032; groups are monovalent organic groups that are bound to silicon through a carbon atom and that contain at least one epoxy function, X, X&#x2032;, Z and Z&#x2032; groups are hydrolyzable groups, Y and Y&#x2032; are monovalent organic groups that are bound to silicon through a carbon atom, n, m, n&#x2032; and m&#x2032; being integers such that n and n&#x2032;=1 or 2 with n+m and n&#x2032;+m&#x2032;=1 or 2.

Optical article comprising a double-layer abrasion and scratch resistant coating and method for production thereof

The present invention relates to a group of novel electrochromic materials. More specifically, it relates to electrochromic materials having two-core viologens and the use of these two-core viologens as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

Electrochromic two-core viologen derivatives and optical articles containing them

The present invention relates to an electrochromic composition comprising at least one reducing compound, at least one oxidizing compound which is selected from specific viologen derivatives, and at least one dye. Said composition can be used as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

Electrochromic composition

The present invention relates to a group of novel electrochromic materials. More specifically, it relates to electrochromic materials based on either single or two-core viologen systems and the use of these viologen systems as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

Electrochromic single and two-core viologens and optical articles containing them

The present invention relates to an electrochromic composition comprising at least one reducing compound and at least two oxidizing compounds, said at least two oxidizing compounds having similar oxydo-reduction potentials. More specifically, said at least two oxidizing compounds are selected from viologen derivatives. Said composition can be used as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.

A method for preparing a colloidal solution of non-aggregated zirconia particles, comprising the following steps:

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Charenton-le-Pont, France

Fabien Berit-Debat