A photochromic compound for incorporation into plastic articles, particularly
into
a plastic lens, is selected from a spiro(indoline)naphtho(2,1-b)(1,4)oxazine and
a spiro(indoline)naphtho(1,2-b)(1,4)oxazine containing a group selected from: (a)
CH2CnF2n+1 at the nitrogen atom in the 1-position on the indoline
part of the molecule, wherein n is an integer of 1 to 6; (b) COOR at the
3-position on the indoline part of the molecule, wherein R is (i) C1-C6 alkyl optionally
substituted by fluoro, C1-C4 alkoxy or fluoroalkoxy, C1-C4 alkylcarbonyloxy, C2-C4
alkenylcarbonyloxy, C3-C6 cycloalkyl or aryl; (ii) C2-C6 alkenyl with a terminal
double bond; (iii) C3-C6 cycloalkyl optionally substituted by fluoro; or (iv) aryl;
(c) an OCF3 group on the benzene ring of the indoline part of the molecule;
(d) an aryl(dialkyl)methyl group of the formula C(aryl)(CnH2n+1)(CmH2m+1),
wherein n and m are integers from 1 to 5, linked to one of the benzene rings of
the naphthoxazine part of the molecule; and (e) any combination of (a), (b), (c)
and/or (d).
