Patent ID: 7767807

Claim:
A phthalocyanine of the formula Ia where, in formula Ia, M is twice hydrogen, R are identical or different —CH 2 -Het moieties, Het is a saturated nitrogen-containing heterocyclic five-, six- or seven-membered radical which is optionally substituted by one or more C 1 -C 4 -alkyl groups and in which the CH 2 group adjacent to the nitrogen atom is optionally replaced by a carbonyl group, the saturated heterocyclic radical being bonded to the CH 2 group of the —CH 2 -Het moiety either via a suitable heteroatom or a carbon atom, and n is in each case independently a value of 0, 1 or 2, with the proviso that the sum of the four values of n is at least 1.