Kao Corporation

Yoshino Gypsum Co., Ltd.

Toshimasa Hamai

Masaaki Shimoda

Daisuke Hamada

Takao Taniguchi

Yoshiaki Tanisho

Yoshinao Kono

Takahiro Sato

Takeshi Tomifuji

Hiroshi Danjo

Nobuyoshi Suzuki

Makoto Okubo

Masato Nomura

Keiichiro Sagawa

Yoshikazu Morii

Masafumi Shonaka

Yoshihito Naka

Yohei Yoshikawa

Kyoichi Shirota

Fujio Yamato

Shuichi Fujita

Masayoshi Ehara

Koji Nagasawa

Makoto Ohkubo

Kenichi Kobata

Kazuo Kita

Kenichiro Yabe

Yusuke Yoshinami

Etsuko Morimi

Hiroyuki Kawakami

Kenichi Suzuki

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 a method for producing a cured article of a hydraulic composition, prepared by mixing glycerol, cement and water, the hydraulic composition containing a sulfate ion, the method including step 1 of preparing the hydraulic composition such that a molar ratio of the sulfate ion to the glycerol, sulfate ion/glycerol, is 5.0 to 20 and the content of the sulfate ion is 3.0 to 15 parts by weight to 100 parts by weight of cement; and step 2 of aging and curing the hydraulic composition obtained in the step 1.

Method for producing cured article from hydraulic composition

This invention relates to an additive composition for a hydraulic composition, which contain a specific copolymer (A) and a compound (B) selected from a specific glycol ether-based compound and a specific glycerin derivate-based compound.

Additive composition for hydraulic composition

The present invention provides the early strengthening agent for hydraulic compositions containing a compound (a) obtained by reacting (A) one or more compounds selected from polyhydric alcohols having 3 to 20 hydroxy groups and alkylene oxide adducts thereof with (B) a sulfating agent, and the additive composition for hydraulic compositions containing the compound (a).

Early strengthening agent for hydraulic composition

The present invention produces the hydraulic powder through grinding of the hydraulic compound in the presence of a compound (a) prepared by reacting (A) at least one compound selected from polyhydric alcohols and alkylene oxide adducts thereof with (B) a sulfating agent.

Method for producing hydraulic powder

This invention relates to an early strengthening agent for a hydraulic composition, which contains a compound (A) selected from a specific glycol ether-based compound and a specific glycerin derivate-based compound, as well as an additive composition for a hydraulic composition, which contains the early strengthening agent and a specific phosphate polymer (B).

In the invention, a hydraulic powder is prepared by a step of grinding a hydraulic compound in the presence of compound (a) that is obtained by adding an alkyleneoxide having 2 to 4 carbon atoms to a compound which has no amino group, but has an active hydrogen, provided that polyethyleneglycol and polypropyleneglycol are excluded. Alternatively, the hydraulic compound can be ground in the presence of compound (a) and anti-foaming agent (b).

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.

Dispersion-retaining agent for hydraulic composition

According to the present invention, a hydraulic powder is prepared by including a step of grinding a hydraulic compound in the presence of (A) glycerin and (B) polyethyleneglycol that are present in a fixed weight ratio.

The present invention relates to a dispersant for a hydraulic composition, containing a polymer obtained by copolymerizing a specific monomer 1 such as an ethylenically unsaturated carboxylic acid derivative having a polyoxyalkylene group, a monoester phosphate-based monomer 2, a diester phosphate-based monomer 3, and an unsaturated carboxylic acid-based monomer 4, at pH 7 or less.

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

An aqueous solution composition of a strong alkali and a nonionic surface active agent comprising: (a) a strong alkali, (b) a nonionic surface active agent having an HLB value of 3-18, and, as a solubilizing agent, (c) a specific type of carboxylic acid is disclosed. The composition contains a strong alkali and a nonionic surface active agent having an HLB value usually of 3-18 at high concentrations and stably and is homogeneous and transparent. Thus, it is useful for a variety of applications requiring both alkalinity and detergency, for example, as wettability promoting agents of glass, fiber, metal, and earthenware surfaces as well as various toiletry products.

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Wakayama, Japan

Toshimasa Hamai