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. 22, 2008
Filed:
Dec. 31, 2004
Toshio Hayashiya, Toyono-gun, JP;
Tomiyasu Ueta, Suita, JP;
Tsutomu Yuasa, Osaka, JP;
Tsuyoshi Hirata, Kobe, JP;
Hiroshi Yamazaki, Sakai, JP;
Toshio Hayashiya, Toyono-gun, JP;
Tomiyasu Ueta, Suita, JP;
Tsutomu Yuasa, Osaka, JP;
Tsuyoshi Hirata, Kobe, JP;
Hiroshi Yamazaki, Sakai, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
There are provided an admixture for cement which enhances water reducing property and flowability of a cement composition, and is excellent in slump retaining performance to retain the flowability with time, a polycarboxylic acid-based polymer for an admixture for cement suitable therefor, a producing method thereof, and a cement composition. One admixture for cement of the present invention contains copolymers (A) and (B) as an essential component, weight average molecular weights (AMw and BMw) of copolymers (A) and (B) are AMw>BMw, or peaktop molecular weights (AMp and BMp) of copolymers (A) and (B) are AMp>BMp. Another admixture for cement of the present invention contains a polycarboxylic acid-based polymer having a lower molecular weight side area ratio P of 50 to 87%.