Process for preparing polymers, polymers, dispersions, inks and uses

A process for preparing a polymer 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 and T2 are each independently HO—, HS— or HNR1—;
• Q1 and Q2 independently are —NR2—;
• A1 and A2 independently are an optionally substituted divalent organic linking group;
• Z is a halogen;
• R1 when present is H or an optionally substituted alkyl, aryl or heterocyclyl group;
• R2 is H or an optionally substituted alkyl, aryl or heterocyclyl group;
• ii) a diisocyanate;
• iii) optionally 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 organic compounds in component iv) has at least one ionic group;
• and wherein the said optional substituents are each independently selected from the group consisting of —NO2, CN, halo, —NHC(O)C1-6alkyl, —SO2NHC1-6alkyl, —SO2C1-6alkyl, —C1-6alkyl, —OC1-6alkyl, —OC(O)C1-6alkyl, polypropyleneoxide ending in a C1-6alkyl group and polyethyleneoxide ending in a C1-6alkyl group.