BINUCLEAR ANTHRACENE PYRIDINE SULPHONIC ACID COMPOUND OR SALT THEREOF AND PREPARATION PROCESS AND USE THEREOF

摘要

Disclosed is a binuclear anthracene pyridine sulphonic acid compound of general formula I or a salt thereof. Magenta ink compositions prepared from the compound and the salt thereof appear fresh, have a bright tone on ink-jet recording paper, excellent water solubility, and good filterability for the membrane filter during the production of ink compositions. Furthermore, the ink composition using the compound of the present invention does not have any precipitated crystals, physical changes, or colour change after a long storage period, and has good stability when stored. Printouts using the magenta ink composition of the present invention have no special requirements as regards recording materials, can faithfully reproduce and present the tone of a coloured image of photographic tone, and have good fastness, such as resistance to light, ozone, and damp, and the image can be kept stable for a long time.