Abstract: The photochromic compounds of the invention correspond to the formula: in which Th2 represents a bithienyl group in one of the positions 5 to 10 of the naphthenic ring system system, R1 denotes a bithienyl or trithienyl group and R2 denotes a bithienyl, trithienyl, aryl, naphthyl, thienyl, furyl, pyrrolyl or N-alkylpyrrolyl group.

Abstract: The present invention relates to photochromic [3H]naphtho[2,1-b]pyran compounds containing an acetylenic substituent, process for their manufacture, and photochromic materials and articles obtained therefrom. The invention, in some specific aspects, relates to photochromic compounds having a [3H]naphtho-[2,1-b]pyran structure and bearing an acetylenic group in one of the positions 7 to 10 of the naphthopyran ring structure.

Abstract: Described are novel reversible photochromic compounds of the homoazaadamantane spirooxazine family. Certain substituents are present on the nitrogen atom of the homoazaadamantane portion of the compound and on the benzene ring fused to the oxazine portion of the compound. These compounds may be represented by the following formula: Also described are compositions, e.g., solvent based mediums and polymerized organic materials, used to produce ophthalmic components, that contain the homoazaadamantane compounds with or without other photochromic compounds.

Abstract: The new photochromic compounds according to the invention, of the spiro[indoline-[2,3']-benzoxazine] type, include at least one electron-withdrawing group attached to the benzoxazine structure in 5' or 6' position by a chain containing at least one ethylenic double bond.Application to ophthalmic optics.

Abstract: The present invention relates to photochromic compounds of spiro?indoline?2,3'!-naphthoxazine! structure, characterized in that they contain, in the 6' position, a group R.sub.6 chosen from the following groups: cyano and phenylsulfonyl linked via the sulfur atom to carbon 6', and methods of using such compounds.

Abstract: The invention relates to photochromic compounds of general formula: ##STR1## wherein R.sup.a, R.sup.b and R.sup.c is denote hydrogen; alkyl; aryl; OR, SR, COR or COOR, in which R denotes hydrogen, alkyl or aryl, amino of formula NR.sub.1 R.sub.2 in which R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl or an aryl; a halogen atom; a mono- or polyhaloalkyl group; or an NO.sub.2, CN or SCN group; n and m denote integers from 1 to 5; p is equal to 1 or 2; and H is a 5-members aromatic heterocycle containing one or more heteroatoms selected from nitrogen, oxygen and sulfur, these heterocyclic nuclei being eventually substituted by one or more alkyl, alkoxy, amino, aryl or aralkyl groups or condensed with a phenyl nucleus, a substituted phenyl nucleus or a 6-members cycloaliphatic nucleus and to their use in ophtalmic optics.

Abstract: The invention relates to ophthalmic lenses comprising a transparent organic polymer material and photochromic compounds of general formula ##STR1## wherein R.sup.a, R.sup.b and R.sup.c are hydrogen; alkyl; aryl; OR, SR, COR or COOR, where R denotes hydrogen, alkyl or aryl, amino of formula NR.sub.1 R.sub.2 where R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl or an aryl; a halogen atom; a mono- or polyhaloalkyl group; or an NO.sub.2, CN or SCN group; n and m denote integers from 1 to 5; p is equal to 1 or 2; and H is an aromatic heterocycle having the general formula: ##STR2## wherein: X, Y and Z represent independently of each other, a CR.sub.8 radical or a nitrogen atom, and one or two of X, Y and Z is a nitrogen atom and R.sub.8 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.6 alkyl and phenyl; and R.sub.4 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.6 alkyl and phenyl.

Abstract: The invention concerns photochromic compounds with general formula (I): ##STR1## where R.sup.a, R.sup.b and R.sup.c represent hydrogen; alkyl, aryl, OR, SR, COR or COOR, where R represents hydrogen, alkyl or aryl, amino with formula NR.sub.1 R.sub.2, where R.sub.1 and R.sub.2 each represent hydrogen, alkyl, cycloalkyl, or aryl, R.sub.1 and R.sub.2 may together form a heterocycle containing four to seven members with the nitrogen atom and may intracyclically contain one or more heteroatoms selected from nitrogen, oxygen, sulphur, or a halogen atom; a mono- or polyhaloalkyl; an NO.sub.

Abstract: The invention relates to photochromic compounds of general formula: ##STR1## in which: R.sup.a and R.sup.b denote hydrogen; alkyl; OR, SR, COR or COOR where R denotes hydrogen, alkyl, aryl or heteroaryl; a group NR.sub.1 R.sub.2 where R.sub.1 R.sub.2 denotes hydrogen, C.sub.4 -C.sub.7 alkyl or cycloalkyl, aryl, or form with the nitrogen a C.sub.4 -C.sub.7 heterocycle; NO.sub.2, CN, SCN or a halogen; a group SO.sub.3 R' where R' denotes hydrogen or an alkali metal; a mono- or polyhaloalkyl; m denotes an integer from 1 to 4 and n is equal to 1 or 2;Cy denotes an aromatic ring or an aromatic or non-aromatic heterocycle;R.sup.c denotes an alkyl, allyl, phenyl or arylalkyl group which is mono- or disubstituted with alkyl, alkoxy or NO.sub.2 ; an alicyclic, an aliphatic hydrocarbon containing one or more hetero atoms;R.sup.d, R.sup.e, R.sup.f and R.sup.

Abstract: The invention relates to photochromic compounds of general formula: ##STR1## in which R.sup.a, R.sup.b and R.sup.c denote hydrogen; alkyl; aryl; OR, SR, COR or COOR, in which R denotes hydrogen, alkyl or aryl, amino of formula NR.sub.1 R.sub.2 in which R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl, aryl, R.sub.1 and R.sub.2 being capable of forming with the nitrogen atom, a heterocycle containing 4 to 7 members and capable of containing, in addition, one or more heteroatoms chosen from nitrogen, oxygen, sulfur, a halogen atom; a mono- or polyhaloalkyl group; an NO.sub.

Abstract: 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.

Abstract: 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) whereinR.sub.1 is a methyl or isopropyl groupR.sub.2 and R.sub.3 are methyl groupsR.sub.4 is H or --OCH.sub.

Abstract: 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.

Abstract: The invention relates to novel thermochromic spiro heterocyclic compounds having one or the other of the following formulae: ##STR1## where R.sub.1 denotes hydrogen atoms or one or more electron-donor groups in positions 5, 6, 7 and 8 in formula (1); R.sub.i ' denotes hydrogen atoms or one or more electron-donor or electron-acceptor groups in positions 4', 5', 6' and 7' and 4", 5", 6" and 7" in formulae (1) and (2); and R.sub.j denotes hydrogen atoms or one or more electron-donor groups in positions 5, 6, 7, 8, 9 and 10 in formula (2). Use in thermographic recording material.