Dispersion ink and process

摘要

A dispersion comprising a particulate solid, a liquid vehicle and a first polymer, wherein: the first polymer is obtained or obtainable by a process comprising reacting at least the components i), ii) and optionally iii) to form a pre-polymer: i) a compound of the Formula (1); wherein T1, T2, Q1, Q2, A1, A2 and Z are as defined in claim 1; ii) a diisocyanate; iii) an isocyanate-reactive compound; and then reacting the pre-polymer with at least component iv): iv) one or more compounds selected from an organic amine, alcohol or thiol provided that at least one of the said one or more organic compounds in component iv) has at least one ionic group; wherein the particulate solid is surface-modified with ionic groups and/or the particulate solid has situated on its surface one or more second polymers which is/are different from the first polymer.