Kao Corporation

Keiichiro Sagawa

Masaaki Shimoda

Koji Nagasawa

Toshimasa Hamai

Daisuke Hamada

Yoshinao Kono

Yoshiaki Tanisho

Shuichi Fujita

Keisuke Nakamura

Yoshihito Naka

Kenichiro Yabe

Hiroyuki Kawakami

The present invention is a hydraulic composition, which includes an &#x3b1;-hydroxy sulfonic acid or a salt thereof, a hydraulic powder and water, wherein the ratio of slag in the hydraulic powder is 60% by mass or more.

Hydraulic composition

The present invention provides a dispersant for a hydraulic composition containing N-methyldiethanolamine and a specific (meth)acrylic acid copolymer as a polycarboxylic acid copolymer dispersing agent to increase the fluidity of a hydraulic composition.

Dispersant for a hydraulic composition

The present invention provides a dispersant for a hydraulic composition, containing (A) a polymer composed of structural units, not less than 70% by weight of which are derived from a monomer represented by the following formula (1) and (B) a naphthalenesulfonic acid-formaldehyde condensate at a weight ratio of components (A) to (B), (A)/(B), of 1/99 to 75/25:HC&#x2550;CHCOOCHCHOH &#x2003;&#x2003;(1).

Dispersant for hydraulic composition

The present invention provides the production of the hydraulic powder containing CA in an amount of 0.5 to 9.5% by weight through a step of grinding a hydraulic compound in the presence of the alkanolamine having a freezing point of not higher than 0&#xb0; C.

Method for producing hydraulic powder

The present invention provides a dispersion-retaining agent for a hydraulic composition being excellent in both fluidity retainability and viscosity retainability and further a dispersion-retaining agent exhibiting fluidity retainability and viscosity retainability regardless of the type of hydraulic powder. The present invention relates to a dispersion-retaining agent for a hydraulic composition, containing a copolymer obtained by polymerizing specific monomer 1 represented by formula (1), with monomer 2 represented by formula (2), the corresponding alcohol compound of which satisfies specific physical properties, wherein, in the constituent monomers of the copolymer, the proportion of the monomer 1 is in a specific range, a specified monomers is used as at least a part of the monomer 2, and the proportion of monomers having an acid group or a neutralized group thereof is 5% by weight or less.

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Wakayama, Japan

Keiichiro Sagawa