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. 26, 1997
Filed:
Dec. 21, 1995
Yoshio Tanaka, Komae, JP;
Akira Ohta, Chigasaki, JP;
Hideyuki Tahara, Osaka, JP;
Tsuyoshi Hirata, Yokohama, JP;
MBT Holding AG, Zurich, CH;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
An admixture for modifying the fluidity of a cementitious mixture comprises a cement-dispersing agent which is an aqueous solution of polymer, in which solution an oxyalkylene-based defoaming agent is dissolved or dispersed in particles of no greater that 20 .mu.M diameter. The polymer is preferably a polymer which comprises units derived from unsaturated carboxylic acid monomer and the polymer is preferably prepared in the presence of the defoaming agent. Particular addition copolymers give particularly good results. The admixture permits good control of the fluidity of cementitious compositions and has extended shelf life.