Pfropfpolymerisate, ihre Herstellung und Verwendung als Stockpunkterniedriger und Fließverbesserer für Rohöle, Rückstandsöle und Mitteldestillate

摘要

The invention relates to graft polymers comprising from 20 to 99.9% by weight of an ethylene copolymer (base polymer) and from 0.1 to 80% by weight of a graft component. The base polymer contains from 30 to 95% by weight of ethylene and from 5 to 70% by weight of vinyl esters of saturated, aliphatic C2- to C18-monocarboxylic acids or from 4 to 50% by weight of vinyl esters of saturated, aliphatic C2- to C18-monocarboxylic acids and from 1 to 20% by weight of linear or branched C3- to C18-monoolefins. Graft components are N-substituted alpha,beta-unsaturated dicarboximides and/or dicarboxamides and/or dicarboxylic acid monoamides and/or ammonium salts of the monoamides. The graft polymers are used to improve the flow properties of paraffin-containing mineral oils and mineral oil distillates.