Heterocyclic chromenes and their use in the field of ophthalmic

Details Heterocyclic chromenes and their use in the field of ophthalmic Heterocyclic chromenes and their use in the field of ophthalmic

1996-06-03

1998-05-19

McPherson, John A.

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

548151, 548218, 548421, 548430, 549457, 252586, G02C 710, C07D49102, C07D51302

Patent

active

057542716

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.

REFERENCES:
patent: 5349065 (1994-09-01), Tanaka et al.
patent: 5411679 (1995-05-01), Kumar

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