The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 1981
Filed:
Jan. 29, 1980
Horst Pennewiss, Darmstadt-Neu-Kranichstein, DE;
Rainer Benda, Rossdorf, DE;
Heinz Jost, Modautal, DE;
Helmuth Knoell, Lautertal, DE;
Rohm GmbH, Darmstadt, DE;
Abstract
What is disclosed is a concentrated polymer emulsion useful as a lubricating oil additive for improving the viscosity index thereof, said emulsion comprising: (1) a dispersed phase of an olefinic copolymer having a molecular weight complementary with respect to the thickening effect desired; (2) a dispersing phase of a polymer predominantly comprising at least one member selected from the group consisting of acrylate ester and methacrylate ester monomers; (3) a vehicle which is a good solvent for the esters in said dispersing phase and a substantially less good solvent for the olefinic copolymer by virtue of the esters dissolved in said vehicle; and (4) an emulsifier, stabilizing phase distribution, which is a member selected from the group consisting of graft copolymers and block copolymers formed from olefinic monomers and at least one member selected from the group consisting of acrylate ester and methacrylate ester monomers.