| 摘要 |
Concentrated emulsions, adaptable to use as pour point improvers, of (1) copolymers of ethylene and a vinyl ester of a C1-C24-carboxylic acid and/or (2) polyalkyl(meth)acrylic acid ester polymers in a liquid carrier medium which does not dissolve said polymers, said emulsions additionally containing, as an emulsifier, a graft- or block-copolymer of the formula A-Y, wherein A is a segment of a copolymer of ethylene and a vinyl ester of a C1-C24-carboxylic acid (corresponding to polymer P1) or of a polymer of esters of acrylic acid and/or methacrylic acid with a C1-C20-alkanol, wherein Y is at least one segment obtained by the polymerization of vinyl monomers which are predominantly esters of acrylic acid or methacrylic acid with a C1-C40-alkanol, and wherein the carrier medium is capable of dissolving segments Y; oils containing such emulsions as pour point improvers. |
