Patent ID: 7041738

Claim:
An additive comprising the following components: A) a copolymer of ethylene and 8–21 mol % of a comonomer of at least one acrylic or vinyl ester having a C 1 –C 18 -alkyl radical and B) a comb polymer of at least one C 8 –C 16 -alkyl ester of an ethylenically unsaturated dicarboxylic acid as monomer group 2 and at least one C 10 –C 20 -olefin as monomer group 1, wherein said comb polymer is characterized by a sum Q of from 23 to 27 according to the formula Q = ∑ i ⁢ w 1 ⁢ i · n 1 ⁢ i + ∑ j ⁢ w 2 ⁢ j · n 2 ⁢ j where Q is the sum of the molar average of the carbon chain distributions in the alkyl side chains of monomer 1 and the molar average of the carbon chain distributions in the fatty alcohols in the ester groups of monomer 2, and w 1 , and w 2 are the molar proportions of the individual chain lengths in the different monomer groups 1 and 2; n 1 , and n 2 are the side chain lengths, and i and j are the individual side chains in the particular monomer.