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:
Mar. 08, 2005
Filed:
Dec. 26, 2001
Tsutomu Yuasa, Osaka, JP;
Tomotaka Nishikawa, Suita, JP;
Noboru Sakamoto, Suita, JP;
Tsuyoshi Hirata, Kobe, JP;
Hiroko Izukashi, Osaka, JP;
Tomiyasu Ueta, Suita, JP;
Hiromichi Tanaka, Toyonaka, JP;
Yoshiyuki Onda, Tokyo, JP;
Toru Uno, Yokohama, JP;
Tsutomu Yuasa, Osaka, JP;
Tomotaka Nishikawa, Suita, JP;
Noboru Sakamoto, Suita, JP;
Tsuyoshi Hirata, Kobe, JP;
Hiroko Izukashi, Osaka, JP;
Tomiyasu Ueta, Suita, JP;
Hiromichi Tanaka, Toyonaka, JP;
Yoshiyuki Onda, Tokyo, JP;
Toru Uno, Yokohama, JP;
Nippon Shokubai Co., Ltd., Osaka, JP;
Abstract
It is an object of the present invention to provide a polycarboxylic acid copolymer which improves the water reducing capacity and workability of cement compositions and the like and making them easier to handle when the fluidity and water reducing capacity are at the same levels, a method of producing the copolymer, and a cement additive and a cement composition comprising the copolymer. The present invention is further to provide a polycarboxylic acid copolymer and a cement additive which are capable of improving the strength and durability of hardening products of cement compositions, hence can advantageously be used in ultrahigh strength concrete. The present invention is still further to provide a method of producing polycarboxylic acid copolymers having high water reducing capacity, reducing the viscosity of cement compositions and improving the workability in applying cement. The present invention is directed to a polycarboxylic acid copolymer which is obtained by copolymerization of monomer components comprising a polyalkyleneimine unsaturated monomer (A1) and an unsaturated carboxylic acid monomer (B).