Kao Corporation

Kao Soap Company, Ltd.

Yoshikazu Morii

Masaaki Shimoda

Toshimasa Hamai

Daisuke Hamada

Yoshiaki Tanisho

Yoshinao Kono

Hotaka Yamamuro

Koji Koyanagi

Kyoichi Shirota

Junichi Tamura

Toshiharu Kojima

Masayoshi Ehara

Yoshihito Naka

Tsuneshi Takeda

Kazuya Otsuji

Yoshitaka Nakatani

Michio Higashiwaki

Yoshiaki c/o Kao Corporation Tanisho

Daisuke c/o Kao Corporation Hamada

Masaaki c/o Kao Corporation Shimoda

Toshimasa c/o Kao Corporation Hamai

Yoshihito c/o Kao Corporation Naka

Yoshinao c/o Kao Corporation Kono

Method for producing phosphoric acid ester-based polymer by copolymerizing monomer 1 of formula (1), monomer 2 of formula (2), and monomer 3 of formula (3): wherein the variables are as defined in the specification; wherein the variables are as defined in the specification; and wherein the variables are as defined in the specification, at pH &#x2266;7 in solvent having dissolved oxygen concentration of 0.01-4.0 mg/kg, or in presence of phosphonic acid-based chelating agent, or by mixing monomers 1 to 3 at 10-50 &#xb0; C., initiating polymerization within 72 hours, and maintaining the temperature at 10-50 &#xb0; C. until polymerization is initiated. The phosphoric acid ester-based polymer may be used as a dispersant in a hydraulic composition.

Method for producing phosphoric acid ester-based polymer

The invention provides an additive for hydraulic compositions, which exhibits an excellent viscosity reducing effect on a hydraulic composition, for example, a hydraulic composition containing a slurry of water and hydraulic powder, and is excellent in operativeness when used as an aqueous solution. The additive for hydraulic compositions contains a phosphoric monoester having a specific group such as an alkyl ether group or a salt thereof (monoester) and a phosphoric diester having a specific group such as an alkyl ether group or a salt thereof (diester) in a monoester weight content of monoester/(monoester+diester) is 0.4 to 0.95 (diester includes a pyrodiester).

Additive for hydraulic compositions

A hollow granular percarbonate is disclosed wherein the granules are hollow and the shell thereof is made of a crystalline percarbonate, along with a process for the preparation thereof.

Hollow granular percarbonate

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Wakayama, Japan

Yoshikazu Morii