Additive as component of mineral oil compositions

A method for producing mineral oil compositions with trace portions of additives wherein the mineral oil compositions that contain as additive a comb polymer containing ester linkages that is either based on

• a) ethylene-vinylester copolymers modified by hydroxy groups or glycidyl groups with molecular mass weight averages from 3000 to 50000 and an ethylene portion of 50 to 90 mass %, and
• b) partially imidated and/or partially esterified maleic anhydride copolymers,
• wherein in the comb polymer based on a) and b) the modified ethylene-vinylester copolymer component is connected by means of ester linkages to the partially imidated and/or partially esterified maleic anhydride copolymer component, or a comb polymer containing ester linkages based on
• c) ethylene-vinylester copolymers modified by acid and/or acid anhydride groups with molecular mass weight averages from 3000 to 50000 and an ethylene portion of 50 to 90 mass %, and
• d) polyalcohols partially esterified with C12-C40-monocarboxylic acids wherein in the comb polymer based on c) and d) the ethylene-vinylester copolymer component modified by acid and/or acid anhydride groups is connected by means of ester linkages with the polyalcohol component partially esterified with C12-C40-monocarboxylic acids,
• and whereby the content of the comb polymer in the mineral oil is 0.005 to 1 mass %, and the mass ratio of the segments comb polymer segment a/comb polymer segment b based on components a and b, or the segments comb polymer segment c/comb polymer segment d based on components c and d is 10:90 to 90:10, respectively,
• are produced in a prehomogenization process in which
• solutions containing 1 to 60 mass % of comb polymer in mineral oil middle distillates are produced at 20 to 90° C. in a first process step, and
• the solutions containing the comb polymer are homogenized with the mineral oil as the main component in a second process step, a total of 0 to 200 mass % in relation to the comb polymer of other additive components being added to the mineral oil in either the first or second process step.