Particles for electrophoretic displays

Colored polymer particles comprising monomer units of a) at least one polymerisable dye comprising a chromophore, at least two polymerisable groups, wherein said polymerizable groups are selected from methacrylates, acrylates, methacrylamides, acrylamides, acrylonitriles, α-substituted acrylates, styrenes and vinyl ethers, vinyl esters, propenyl ethers, oxetanes and epoxys;

• optionally fixed by at least one linker group, and optional groups to modify physical properties and optionally charged group(s), b) at least one co-monomer, c) optionally at least one charged co-monomer, and d) optionally at least one crosslinking co-monomer wherein
• the polymerisable dye is an anthraquinone dye selected from formulae (XII) to (XIV);
• wherein
• R selected from the group consisting of H, alkyl, substituted or non-substituted aryl, —F, —Cl, —Br, —I, —OR′, —SR′, —C(O)R′, —C(O)OR′, —NHCOR′, —NO2, —CN, —SO3H, —NR′R″, with R′ and R″ independently of one another equal to H or alkyl,
• and L1 and L2 are independently of one another a single bond, optionally substituted cycloalkyl or aromatic ring, linear or branched, optionally substituted, alkylene, where one or more non-adjacent C atoms may be replaced by O, S and/or N, and/or one or more double and/or triple bonds may be present in the chain and/or side chain or a combination thereof, and Y1 and Y2 are independently of one another, polymerisable group.