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:
Apr. 11, 2006
Filed:
Oct. 10, 2003
Irene Schober, Zürich, CH;
Theodor A. Bürge, Geroldswil, CH;
Ulf Velten, Zürich, CH;
Jürg Widmer, Zürich, CH;
Christian M. Bürge, Schafisheim, CH;
Urs Mäder, Frauenfeld, CH;
Irene Schober, Zürich, CH;
Theodor A. Bürge, Geroldswil, CH;
Ulf Velten, Zürich, CH;
Jürg Widmer, Zürich, CH;
Christian M. Bürge, Schafisheim, CH;
Urs Mäder, Frauenfeld, CH;
Sika Schweiz AG, , CH;
Abstract
Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10–10:1, and preferably 1:10–10:1 reduces the drop in fluidity with time of cementitious compositions.