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:
Jan. 27, 2009
Filed:
Mar. 05, 2004
Toshimi Matsumoto, Kanagawa, JP;
Sven Asmus, Shanghai, CN;
Gerhard Albrecht, Tacherting, DE;
Klaus Lorenz, Zangberg, DE;
Petra Wagner, Trostberg, DE;
Christian Scholz, Trostberg, DE;
Toshimi Matsumoto, Kanagawa, JP;
Sven Asmus, Shanghai, CN;
Gerhard Albrecht, Tacherting, DE;
Klaus Lorenz, Zangberg, DE;
Petra Wagner, Trostberg, DE;
Christian Scholz, Trostberg, DE;
Construction Research & Technology GmbH, Trostberg, DE;
Abstract
The present invention concerns a cement additive containing copolymers comprising one or more constitutional units represented by formula A: (A) Ris hydrogen, an alkyl group having 1 to 4 carbon atoms, an alkenyl group having 1 to 4 carbon atoms or an aryl group having 6 to 9 carbon atoms; R2 is hydrogen or an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 1 to 9 carbon atoms or an aryl group having 6 to 9 carbon atoms; T is alkylene (including straight-chain and branched alkylene) having 1 to 4 carbon atoms or arylene having 6 to 9 carbon atoms; n is 0 or 1; Sand Sare, independently of one another, —OCH— or —OCHCHR—, with the proviso that k is 2 or 3, R3 is an alkyl group having 1 to 9 carbon atoms, an aryl group having 6 to 9 carbon atoms; and 6<_m+m<_25.