Patent ID: 7932320

Claim:
An aqueous dispersion of latex particles, said latex particles containing a polymer consisting of structural units including monomer units according to formula (I): in which R 1 and R 2 independently of one another represent hydrogen or a C 1-5 -alkyl group or together form an optionally substituted C 1-5 -alkylene residue and at least one polyanion compound, said latex having a primary particle size of less than 40 nm and said dispersion contains an organic compound containing a di- or polyhydroxy- and/or carboxy groups or amide or lactam group or an aprotic compound with a dielectric constant, ε, ≧15, wherein said latex particles contain said at least one polyanion compound and said polymer in a weight ratio of at least 4 and wherein said latex particles are prepared in a reaction medium in the substantial absence of oxygen.