Sika Technology Ag

Toho Chemical Industry Co., Ltd.

Sika Corporation

Kaname Saitoh

Akira Ikeda

Akira Suga

Michael Wernher Danzinger

Seiichi Koshisaka

Atsushi Kobayashi

Satoshi Kobayashi

Taro Tsushima

Wernher M Danzinger

Jun Imamura

Tetsu Tomoyose

Ikuhide Togami

Hirofumi Bandoh

Toshihiro Ogawa

Susumu Hashizume

An admixture for a hydraulic composition includes a polycondensation product P containing a copolymer prepared by polycondensation of a monomer mixture containing compounds A to C of the following Formulae (A) to (C); and a polycarboxylic acid-based polymer Q including a structural unit having an amino and an imino group, and/or a structural unit having an amino, imino, and amido group: 

Admixture for hydraulic composition

To provide a chemical agent whereby adjustment of air volume is easier, particularly in a hydraulic composition having fly ash blended therein. An admixture for a hydraulic composition, having a structure indicated by general formula (1) and including a carbon blocker including either one type of compound selected from a group comprising phosphate esters or at least two mixtures; and a water-reducing agent. (In the formula, Rindicates a hydrogen atom, an alkyl group, an alkenyl group, or a (meth)acryloyl group, AO indicates a C2-3 oxyalkylene group, n indicates an average added molar number for the oxyalkylene group AO of 2-150, m indicates an integer between 1 and 3, M indicates a hydrogen atom, an alkali metal atom, a group II metal atom, an ammonium group, or an organic ammonium group.)

A superior cement dispersant and a concrete composition containing the cement dispersant, the cement dispersant being a water-soluble amphoteric copolymer which contains an alkylene oxide adduct of a polyamide polyamine having an unsaturated group and at least two types of polyalkylene glycol ester. When the cement dispersant is compounded with a concrete composition, the dispersion performance thereof increases with time, and the concrete viscosity is effectively decreased. The cement dispersant composition contains a water-soluble amphoteric copolymer or the neutralized salt thereof as an essential component, which is obtained by copolymerizing an alkylene oxide adduct of a polyamide polyamine having an unsaturated group, (meta)acrylic acid or an alkali metal, ammonium, or alkanolamine salt thereof, an ester of an alkylene glycol and methacrylic acid, and an ester of an alkylene glycol and acrylic acid. In addition, the concrete composition containing the above cement dispersant is also disclosed.

Cement dispersant and concrete composition containing the dispersant

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Hiratsuka, Japan

Kaname Saitoh