Polymer emulsions with bimodal molecular-weight distribution

US5773505A · kind A · utility

Assignee

• Roehm GmbH Chemische Fabrik · DE

Inventors

• Horst Pennewiss · Darmstadt, DE
• Claudia Beyer · Seeheim-Jugenheim, DE
• Ruediger Jelitte · Bound Brook, US
• Bernhard Will · Wiesbaden, DE
• Clemens Auschra · Glückstadt, DE
• Juergen Omeis · Emmelshausen, DE

Key dates

• Filing date: Nov 12, 1996
• Grant date: Jun 30, 1998
• Expiry date: Nov 12, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M2217/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to polymer emulsions of poly(meth)acrylic acid esters and olefin copolymers suitable for improvement of the viscosity index, for use as oil additives. The polymer emulsion is formed of a continuous phase of poly(meth)acrylic acid esters and d-oligomers where the esters and oligomers have a bimodal molecular-weight distribution, a stabilizing agent (a graft or block polymerizate of an olefin copolymerizate and methacrylic acid esters), and a disperse phase of olefin copolymerizates distributed in the continuous phase.