Dispersant for calcium carbonate-containing cement composition and calcium carbonate-containing cement composition
(22) 06.11.2023
(43) 16.05.2024
(57) The present invention provides a dispersant that can effectively lower the viscosity of a cement composition containing calcium carbonate. The present invention relates to a dispersant to be used for a calcium carbonate-containing cement composition that contains 5-95 mass% of calcium carbonate. This dispersant is characterized by containing a copolymer, the copolymer having a stnictural unit derived from an unsaturated polyalkylene glycol ether monomer represented by formula (1) (in the formula: RI, R2 and R3 are the same or different and represent a hydrogen atom or a methyl group; R4 represents a direct bond, a CH2 group or a CH,CH2 group; AOs are the same or different and represent an oxyalkylene group having 2-18 carbon atoms; n represents the repeating number of the oxyalkylene group and is 1-300; and R5 represents a hydrogen atom or a hydrocarbon group having 1-18 carbon atoms) and a structural unit derived from an unsaturated carboxylic acid monomer, wherein the content ratio of the unsaturated carboxylic acid monomer-derived structural unit is 20-70 mass% per 100 mass% of the total structural units, and having a weight-average molecular weight of 5000-35000.
(71) Nippon Shokubai Co., Ltd., Osaka (JP)
(84) ARIPO (BW, CV, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SC, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS)
