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:
Jun. 27, 2017
Filed:
Oct. 27, 2015
Evonik Roehm Gmbh, Darmstadt, DE;
Joachim Knebel, Alsbach-Haehnlein, DE;
Ralf Merbach, Buettelborn, DE;
Guido Protzmann, Bensheim, DE;
Klaus Gottmann, Heppenheim, DE;
John Hirsh, Fairhope, AL (US);
Gerold Schmitt, Aschaffenburg, DE;
Dieter Tessmer, Darmstadt, DE;
Wilhelm Karnbrock, Bensheim, DE;
Wolfgang Klesse, Mainz, DE;
Volker Kerscher, Reinheim, DE;
Evonik Roehm GmbH, Darmstadt, DE;
Abstract
Process for preparing (meth)acrylates of the formula (I)CH═C(R)—CO—O—R  (I)in which Ris hydrogen or methyl andRis a saturated or unsaturated, linear or branched, aliphatic or cyclic alkyl radical having 6 to 22 carbon atoms, or a (C-C)-aryl-(C-C)-alkyl radical;by reacting a (meth)acrylate of the formula IICH═C(R)—CO—OR  (II)with an alcohol of the formula (III)HO—R  (III)in the presence of an amount of a suitable catalyst which catalyzes the reaction and of an amount of a phenolic polymerization inhibitor or a combination of two or more phenolic polymerization inhibitors which is sufficient to inhibit undesired polymerization;the reaction being undertaken with input or introduction into the reaction mixture resulting from the reaction of an amount of oxygen or of an oxygenous gas mixture sufficient to inhibit undesired polymerization, and the process is characterized in thatthe specific total oxygen input is less than or equal to 1.0 l/kg, measured in liters of oxygen per kilogram of (meth)acrylate of the formula (I), where the volume of oxygen introduced is calculated at a temperature of 25° C. and a pressure of 101 325 pascal. The resulting (meth)acrylates can surprisingly be processed to particularly high molecular weight emulsion polymers which are, for example, outstandingly suitable for use as flow resistance reducers in mineral oil extraction.