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:
Feb. 15, 2005
Filed:
Mar. 29, 2001
Ulf Velten, Zürich, CH;
Ueli Sulser, Oberengstringen, CH;
Jürg Widmer, Zürich, CH;
Irene Schober, Zürich, CH;
Theodor A. Bürge, Geroldswil, CH;
Ulf Velten, Zürich, CH;
Ueli Sulser, Oberengstringen, CH;
Jürg Widmer, Zürich, CH;
Irene Schober, Zürich, CH;
Theodor A. Bürge, Geroldswil, CH;
Sika Schweiz AG, Zurich, CH;
Abstract
Polymers for cement dispersing admixtures, which show different performing properties in concrete are described. All polymers are based on a composition of reactants, namely a) a poly(acrylic acid), b) a polyalkyleneglycol-monoalkylether and, optionally c) a α-amino-polyalkylene-glycol-ω-alkylether and/or d) a primary or secondary amine. By keeping the composition of reactants constant and varying only the reaction time, polymers with different properties can easily be achieved. Such polymers are suitable for pre-cast, readymix or for increasing workability over time, just depending on reaction time. Polymers of the invention can be used as single polymer or in polymer blends. For this, the kinetics of the used polymer analogous condensation reaction was intensively studied. Additionally, the benefit of amines as reactant regarding stability and hydrolysis velocity of cleavable side groups was investigated.