Photochrome alkyl substituted spiroindoline compounds

Abstract

A compound is described with the general formula ##STR1## where R.sup.1 is one to four substituted groups from the series --Z, --OZ, --NZ.sub.2, --NHZ, NH.sub.2, CN, CF.sub.3 with Z: C.sub.1 -C.sub.5 alkyl, phenyl, pyridyl, benzyl R.sub.2 =--H, --Z, --CH.sub.2 Z, R.sub.3,R.sub.4,R.sub.5 =--NH.sub.2, --NHZ, --NZ.sub.2, --OZ, --Z, --H R.sub.6 =--H, --Z, --OZ, --CN, --NO.sub.2 HAr=heteroaromatic substances with two or three cores and with 1 or 2N atoms in accordance with one of the following structural formulae: ##STR2## The compounds in accordance with this invention have the advantage that their migration in plastic materials usually used for spectacle lenses is lower so that no softening agent effect occurs which would be of a disadvantage for the coating of such lenses with, for example, anti-reflection coating layers.

Dependencies are inferred from the claim text.