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1. (WO2001004233) BI-OR TERTHIENYL SUBSTITUTED PHOTOCHROMIC NAPHTHO[2,1-B]PYRAN COMPOUNDS

Pub. No.:    WO/2001/004233    International Application No.:    PCT/FR2000/001954
Publication Date: Fri Jan 19 00:59:59 CET 2001 International Filing Date: Fri Jul 07 01:59:59 CEST 2000
IPC: B32B 17/10
C07D 409/14
C09K 9/02
G02B 5/23
Applicants: ESSILOR INTERNATIONAL COMPAGNIE GENERALE D'OPTIQUE
Inventors: FRIGOLI, Michel
MOUSTROU, Corinne
SAMAT, André
GUCLIELMETTI, Robert
Title: BI-OR TERTHIENYL SUBSTITUTED PHOTOCHROMIC NAPHTHO[2,1-B]PYRAN COMPOUNDS
Abstract:
The invention concerns photochromic compounds corresponding to the formula (I) wherein: Th2 represents a bithienyl group in one among positions 5, 6, 8-10 of the naphthenic cycle; R1 represents a bithienyl or trithienyl group; and R2 represents a bithienyl, trithienyl, aryl, naphthyl, thienyl, furanyl, pyrrolyl or N-alkyl pyrrolyl group. The invention is useful for making glazing for buildings, windscreen, helmet visor and glasses for spectacles.