Aqueous color pigment pastes containing a polymerizate, and basecoats produced therefrom

A method for dispersing color pigments within an aqueous pigment paste, the method comprising:

• using a polymer having a particle size in a range from 100 to 500 nm, prepared by successive radical emulsion polymerization of three monomer mixtures (A), (B) and (C) of olefinically unsaturated monomers in water, wherein the mixtures (A), (B), and (C) are different from one another, and
• wherein
• the mixture (A) comprises at least 50 wt % of monomers having a solubility in water of less than 0.5 g/l at 25° C., and a polymer prepared from the mixture (A) possesses a glass transition temperature of 10 to 65° C.,
• the mixture (B) comprises at least one polyunsaturated monomer, and a polymer prepared from the mixture (B) possesses a glass transition temperature of −35 to 15° C., and
• a polymer prepared from the mixture (C) possesses a glass transition temperature of
• −50 to 15° C.,
• and wherein
• in stage i. first the mixture (A) is polymerized,
• in stage ii. then the mixture (B) is polymerized in the presence of the polymer prepared under stage i, and
• in stage iii. thereafter the mixture (C) is polymerized in the presence of the polymer prepared under stage ii.