| abstract |
A compound of formula (1) and salts thereof, wherein: M is a metal or hydrogen; Pc is a phthalocyanine nucleus; each R 1 independently is H or optionally substituted alkyl aryl or aralkyl; each L 1 independently is a divalent organic linking group; Z is an optionally substituted piperazinyl group; q is 1 or 2; x and y each independently have a value of 0.5 to 3.5; and (x+y) is from 2 to 5. A process for making the compounds of formula (1). The compounds of formula (1) are useful as colorants for inks which are used in for example ink jet printing of substrates such as paper, plastics, textile materials, metal or glass. |