Tokuyama Soda Kabushiki Kaisha

Kenji Tanaka

Satoshi Imura

Yasuji Kida

Takashi Tanaka

A compound represented by the following general formula (II): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, represent a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, a phenyl group, a benzyl group, a phenethyl group, an alkylamine group having 1 to 4 carbon atoms, or a dialkylamino group having 2 to 8 carbon atoms, and ##STR2## represents a nobornylidene group or bicyclo [3,3,1]9-nonylidene group which may have a substituent, and ##STR3## represents a pyridine, quinoline, pyrrole or benzothiophene group which may have a substituent.

Photochromic compound

A photochromic compound represented by the following general formula [I] ##STR1## wherein ##STR2## represents a divalent aromatic hydrocarbon group or a divalent heterocyclic group each of which may have a substituent,

Photochromic compound, process for production thereof, use thereof and

Disclosed is a compound represented by the following general formula(I): ##STR1## wherein R.sub.1 and R.sub.2, which may be the same or different, represent a hydrogen atom, an alkyl group, an aryl group, an aralkyl group or a substituted amino group, R.sub.3 and R.sub.4, which may be the same or different, represent an alkyl group, or R.sub.3 and R.sub.4 together form a nobornylidene group or bicyclo (3, 3, 1) 9-nonylidene group which may have a substituent, and ##STR2## represents a divalent aromatic hydrocarbon group or divalent unsaturated heterocyclic group which may have a substituent, with the proviso that when R.sub.3 and R.sub.4 represent an alkyl group, ##STR3## represents a bicyclic aromatic fused ring which is substituted with at least one substituent selected form the group consisting of a halgoen atom, an alkyl group, an alkoxy group, --R.sub.5 --S--R.sub.6 and ##STR4## (in which R.sub.5 represents an alkylene group or --O--R.sub.8).sub.n (in which R.sub.8 represents an alkylene group and n is a positive integer), R.sub.6 and R.sub.7, which may be the same or different, represent an alkyl group, and X represents --N&lt;, --P&lt;, ##STR5## at least one of the substituents being an alkyl group having 6 to 20 carbon atoms, an alkoxy group having 6 to 20 carbon atoms, --R.sub.5 --S--R.sub.6 or ##STR6## a composition comprising this compound, and a photochromic lens composed of this composition.

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Tokuyama, Japan

Kenji Tanaka