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:
Aug. 14, 2012
Filed:
May. 24, 2011
Klaus K. Lorenz, Zangberg, DE;
Alexander Kraus, Evenhausen, DE;
Barbara Wimmer, Tacherting, DE;
Petra Wagner, Trostberg, DE;
Christian Scholz, Wald an der Alz, DE;
Manfred Bichler, Engelsberg, DE;
Klaus K. Lorenz, Zangberg, DE;
Alexander Kraus, Evenhausen, DE;
Barbara Wimmer, Tacherting, DE;
Petra Wagner, Trostberg, DE;
Christian Scholz, Wald an der Alz, DE;
Manfred Bichler, Engelsberg, DE;
Construction Research & Technology GmbH, Trostberg, DE;
Abstract
Preparing a non-ionic copolymer having a hydrolysable monomer residue and a polyether macromonomer residue in a semicontinuous mode in a polymerization reactor associated with a metering device, including introducing polyether macromonomer and water into the reactor, wherein hydrolysable monomer which is added thereto forms a polymerization reaction mixture; introducing hydrolysable monomer into the metering device; adding hydrolysable monomer into the reactor from the metering device; passing a free radical polymerization initiator into the reactor before and/or during the addition of the hydrolysable monomer, the hydrolysable monomer and the polyether macromonomer reacting by free radical polymerization to form the non-ionic copolymer; and, subjecting the reaction mixture to polymerization while an addition rate of the hydrolysable monomer and/or at least a component of the polymerization initiator is varied stepwise or continuously. No monomer is introduced to incorporate ionic cement binding sites into the non-ionic copolymer.