	US 12,454,486 B2
	Process for producing calcium silicate hydrate
Michael Dietzsch, Ludwigshafen am Rhein (DE); and Christoph Hesse, Trostberg (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 18/030,511
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Oct. 5, 2021, PCT No. PCT/EP2021/077358 § 371(c)(1), (2) Date Apr. 6, 2023, PCT Pub. No. WO2022/073961, PCT Pub. Date Apr. 14, 2022.
Claims priority of application No. 20200987 (EP), filed on Oct. 9, 2020.
Prior Publication US 2023/0365468 A1, Nov. 16, 2023
Int. Cl. C04B 28/18 (2006.01); C04B 24/32 (2006.01); C04B 40/00 (2006.01); C04B 103/40 (2006.01)

CPC C04B 28/186 (2013.01) [C04B 24/32 (2013.01); C04B 40/005 (2013.01); C04B 2103/408 (2013.01)]

13 Claims

1. A process for producing a composition comprising calcium silicate hydrate, the process comprising the steps of

a) reacting a calcium hydroxide source with a silicon dioxide source in the presence of water under hydrothermal conditions at a temperature in the range of from 100° C. to 400° C. for a period of from 1 hours to 30 hours, forming a process product from step a);

b) bringing in contact

i) the process product from step a) and

ii) a water-soluble polymeric dispersant

in an aqueous medium while introducing kinetic energy, forming a process product of step b;

and optionally,

c) adding the process product of step b) to a building material mixture comprising a hydraulic binder or a latent hydraulic binder;

wherein an organic compound is added in at least one of the steps a), b) or to the process product after completion of step b),

wherein the organic compound has a molecular weight of 100 to 600 g/mol and from 0.015 to 0.035 functional groups per gram of the organic compound, wherein the functional groups being selected from —OH, —COOH, —COOM_a, —SO₃H, —SO₃M_a, or —C(═O)H, wherein M is hydrogen, a mono-, di- or trivalent metal cation, ammonium ion or an organic amine radical and a is ⅓, ½ or 1,

wherein when the organic compound is added in step a), the temperature in step a) is chosen below the melting point of the organic compound used and

wherein when the organic compound is added to the process product after completion of step b), and if the process comprises a step c), the organic compound is added between steps b) and c).