| abstract |
The present invention provides an additive comprisingn A) a copolymer of ethylene and 8-21 mol % of at least one acrylic or vinyl ester having a C 1 -C 18 -alkyl radical and B) a comb polymer containing structural units ofn B1) at least one olefin as monomer 1, which bears at least one C 8 -C 18 -alkyl radical on the olefinic double bond, and B2) at least one ethylenically unsaturated dicarboxylic acid as monomer 2, which bears at least one C 8 -C 16 -alkyl radical bonded via an amide and/or imide moiety, wherein the sum Q n nn Q = ∑ i w 1 i · n 1 i + ∑ j w 2 j · n 2 j nof the molar averages of the carbon chain length distributions in the alkyl radicals of monomer 1 on the one hand and the alkyl radicals of the amide and/or imide groups of monomer 2 on the other hand is from 23 to 27, wheren w 1 is the molar proportion of the individual chain lengths in the alkyl radicals of monomer 1, w 2 is the molar proportion of the individual chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2, n 1 are the individual chain lengths in the alkyl radicals of monomer 1, n 2 are the individual chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2, i is the serial variable for the individual chain lengths in the alkyl radicals of monomer 1, and j is the serial variable for the individual chain lengths in the alkyl radicals of the amide and/or imide groups of monomer 2. |