Cement additive, method for producing the same, and cement...

Details Cement additive, method for producing the same, and cement... Cement additive, method for producing the same, and cement...

C - Chemistry, Metallurgy

08

F

402/3, 261/56.4

C08F 20/00 (2006.01) C04B 24/16 (2006.01) C04B 24/24 (2006.01) C04B 24/26 (2006.01) C04B 24/28 (2006.01) C04B 24/32 (2006.01) C04B 28/02 (2006.01) C08F 8/00 (2006.01)

Patent

CA 2037058

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. Image ... ( I ) [ In the formula ( I ), R1 and R2 independently denote any one of the following. Image , Image , Image , and -CH2- , Image However, R1 may not be required in a case of that R2 is the following. Image Moreover, R and R' independently denote an alkyl group of carbon number of 1 to 5. ]

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