Abstract: The present invention is directed to an ink composition for forming an organic semiconductor layer, wherein the ink composition comprises: —at least one p-type dopant comprising electron withdrawing groups; —at least one first auxiliary compound, wherein the first auxiliary compound is an aromatic nitrile compound, wherein the aromatic nitrile compound has about ?1 to about ?3 nitrile groups and a melting point of about <100° C., wherein the first auxiliary compound is different from the p-type dopant; and wherein the electron withdrawing groups are fluorine, chlorine, bromine and/or nitrile.

Abstract: A process for preparing a seed latex of an epoxy-containing polymer by radical polymerization in aqueous emulsion of at least one epoxy-containing monomer and optionally at least one comonomer is disclosed. Also disclosed are a process for preparing a vinylidene chloride polymer latex either by radical polymerization in aqueous emulsion of vinylidene chloride and optionally at least one comonomer in the presence of the epoxy-containing polymer seed latex obtained by the process according to the invention; or by mixing the epoxy-containing polymer seed latex with a vinylidene chloride polymer latex obtained separately by radical polymerization in aqueous emulsion.