Ethylene-vinyl ester copolymer emulsions

US4906682A · kind A · utility

Assignee

• Rohm Co., Ltd. · JP

Inventors

• Michael Mueller · Bensheim, DE
• Horst Pennewiss · Darmstadt, DE
• Juergen Gebhardt · Schaafheim, DE

Key dates

• Filing date: Sep 7, 1988
• Grant date: Mar 6, 1990
• Expiry date: Sep 7, 2008

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10L1/2368
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Concentrated emulsions, adaptable to use as pour point improvers, of (1) copolymers of ethylene and a vinyl ester of a C.sub.1 -C.sub.24 -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 EQU A--Y, wherein A is a segment of a copolymer of ethylene and a vinyl ester of a C.sub.1 -C.sub.24 -carboxylic acid (corresponding to polymer P1) or of a polymer of esters of acrylic acid and/or methacrylic acid with a C.sub.1 -C.sub.20 -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 C.sub.1 -C.sub.40 -alkanol, and wherein the carrier medium is capable of dissolving segments Y; oils containing such emulsions as pour point improvers.