Powdered Polycarboxylic Acid-Based Cement Dispersant and Dispersant Composition Containing the Dispersant
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United States of America Patent
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Issued Date -
Jun 12, 2008
app pub date -
Dec 2, 2005
filing date -
Dec 2, 2004
priority date (Note) -
Abandoned
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Abstract
There is provided a powdered polycarboxylic acid-based cement dispersant containing a polyamide-polyamine in a skeleton of a polymer thereof and a dispersant composition containing the dispersant, the dispersant having improved water reducing ability, slump-flow retention, and strength-developing properties of concrete, enabling effective prevention of blocking, being highly soluble in a slurry, and being homogeneously mixed with an inorganic powder. The powdered polycarboxylic acid-based cement dispersant comprises a powdered cement dispersant obtained by dry-powdering a solution or dispersion of a copolymer containing a polyamide-polyamine in a skeleton of a polymer thereof, wherein the powder has a sphere form, an average particle diameter of 30 to 300 .mu.m, and a particle size distribution in which the mass of particles having a particle diameter of 50 to 350 .mu.m accounts for 70% or more of the total mass of the powder.
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