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:
Dec. 29, 1998
Filed:
Dec. 05, 1996
Hideyuki Tahara, Osaka, JP;
Hiroshi Ito, Takatsuki, JP;
Yasuhiro Mori, Matsuzaka, JP;
Makoto Mizushima, Suita, JP;
Nippon Shokubai Kagaku Kogyo Co, Ltd., Osaka, JP;
Abstract
A cement additive is added to increase flowability of a cement composition and to prevent a slump loss, but those characters are insufficient, or the cement additive becomes ununiform in the cement composition and causes a trouble of the hardening inferiority. Thus, to solve the subjects, the present invention provides a cement additive composed of a crosslinked polymer in which, between main chains having a water-soluble polymer structure of a molecular weight from 500 to 100,000, a bond having as a structural unit at least one group selected from divalent groups as shown in the following formula (I) is formed. ##STR1## �In the formula (I), R.sup.1 and R.sup.2 independently denote any one of the following. ##STR2## However, R.sup.1 may not be required in a case of that R.sup.2 is the following. ##STR3## Moreover, R and R' independently denote an alkyl group of carbon number of 1 to 5.!