| abstract |
The present invention relates to a class of compounds as represented by general formula (I) or (III), or salt thereof, or mixture thereof, and a preparation method and use thereof. In formula (I), X 1 is H or CO 2 H; X 2 is OH or a phenyl with 0 to 2 sulfonic acid substituents located at any position of a benzene ring; when X 2 is OH, X 1 is H; when X 2 is the phenyl with 0 to 2 sulfonic acid substituents, X 1 is H or CO 2 H; n is an integer from 0 to 2; in formula (III), n and m are respectively integers from 0 to 2. The compounds and mixture thereof not only have improved light resistance, ozone resistance and water resistance, but also have good water solubility and long-term stability in jet ink. |