Alphamicron, Inc.

Essilor International (compagnie Generale D'optique)

Essilor International

Linli Su

Bahman Taheri

Ludmila Sukhomlinova

Tamas Kosa

Jean-Paul Cano

Bernard Mark Heron

Stuart Aiken

Christopher David Gabbutt

Christine Martincic

Volodymyr Bodnar

Jean Paul Cano

Christoper David Gabbutt

A naphthopyran compound represented by the formula (I): wherein:

3H-naphtho [2,1-B] pyrans as photochromic dichroic dyes and optical article containing them

We describe a wide band variable transmission optical device, mixtures for use in such a device, and methods of making the same. The wide band optical device includes a cell comprising a guest-host mixture of a liquid crystal host and a dichroic guest dye material contained between a pair of plastic substrates. The optical device does not use polarizers. The liquid crystal host has an axis orientation that is alterable between a clear state orientation and a dark state orientation perpendicular thereto and the dichroic guest dye material includes one or more dichroic dyes. The optical device is characterized in that it exhibits a wide absorption band that is greater than 175 nm within a visible wavelength range of 400-700 nm and has a clear state transmission equal to or above 30% and a dark state transmission equal to or below 40%.

Wide band variable transmittance optical device and mixture

A naphthopyran compound represented by the formula Band Bare selected independently from the group consisting of a phenyl, naphthyl, or heterocyclic aromatic group, or may combine to form one or more aromatic rings. Band Bmay further include one or more substituents. R, R, R, R, and Rare selected independently from the group consisting of hydrogen, halogen, &#x2014;R, &#x2014;OH, &#x2014;OR, &#x2014;O&#x2014;CO&#x2014;R, &#x2014;CN, &#x2014;NO, &#x2014;SOR, &#x2014;SOR, &#x2014;SH, &#x2014;SR, &#x2014;NH, &#x2014;NHR, &#x2014;NRR, or &#x2014;NRR; or wherein Rand Rcombine to form a cyclic group. Rmay include an alkyl, polycycloalkyl, alkenyl, polyalkenyl, haloalkyl, perhaloalkyl, alkynyl, polyalkynyl, hydroxyalkynyl, polyhydroxyalkynyl; or (C)cycloalkyl group. Rand Rmay include hydrogen or alkyl groups, or may combine to form a saturated heterocyclic group, or together with an adjacent phenyl group may form a julolidinyl group. Ris a mesogenic group. And the naphthopyran, which may be referred to as a dichroic-photochromic compound, may be incorporated into an optical article.

Dichroic-photochromic 2H-naphtho[1,2-b]pyran compounds and devices

A mixture used in photochromic devices comprises a photochromic dye and a thermoset adhesive. An optical device using the mixture may include a carrier substrate which may then be secured to another substrate or a lens. Assembly of the carrier substrate and mixture to another substrate and/or lens may be accomplished by thermoforming, lamination, insert molding or the like.

Photochromic devices and methods for making the same

A naphthopyran compound represented by the formula 

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Stow, OH, United States of America

Linli Su