Polymer microspheres containing latent colorants and method of preparation

A polymer microsphere comprising at least one polymer and at least one bound latent colorant, wherein said microsphere is stabilized by at least one stabilizing polymer, wherein said latent colorant comprises at least one coupler of formula (I):

• wherein:
• R represents a hydrogen atom, a lower alkyl group containing from 1 to 4 carbon atoms, or a chlorine atom;
• X represents —CONH—, —NHCONH—, —NHCOO—, —COO—, —SO2—, —CO— or —O—;
• Y represents —CONH— or —COO—;
• A represents an unsubstituted or substituted alkylene group containing from 1 to 10 carbon or an unsubstituted or substituted phenylene group;
• Q represents a cyan color forming coupler residue, a magenta color forming coupler residue or a yellow color forming coupler residue capable of forming a dye upon coupling with an oxidation product of an aromatic primary amine developing agent;
• m represents 0 to 1;
• and
• n represents 0 or 1.