| abstract |
(57) [Problem] To provide a cement additive capable of effectively reducing air entrainment and having excellent fluidity. Kind Code: A1 Abstract: 50 moles of an oxyalkylene group in a monomer % Or more of the monomer (I) in which the oxyalkylene group has 3 to 18 carbon atoms, 50 moles of the oxyalkylene group in the monomer A cement additive obtained by copolymerizing a monomer (II), a carboxylic acid monomer (III) and a copolymerizable monomer (IV), if necessary, in which at least% is an oxyethylene group. |