To provide a cement dispersing agent which is capable of improving the workability while maintaining the good finish in the manufacturing of a centrifugal molded product such as a Hume cement pipe and of shortening the compaction time.
The cement dispersing agent comprises the joint use of the first copolymer and the second copolymer each containing the constituent units of a specific monomer (a) such as an ethylenically unsaturated carboxylic acid derivative having a polyoxyalkylene group or the like and of a specific monomer (b) such as (meth)acrylic acid or the like, under such a condition that the difference between a mole % of (b) relative of the sum total of (a) plus (b) in the first copolymer and a mole % of (b) relative to the sum total of (a) plus (b) in the second copolymer is 5 or more.
COPYRIGHT: (C)2004,JPO
Yoshikazu Morii
Wa Fuji Sakura
| JP20042175A | ||||
| JP2000290056A | ||||
| JP1160305A |
Takahiko Mizobe
Shinji Mochida
Yoshitsune Kazumasa