# US 9,040,609 B2 · Powdered accelerator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,040,609 B2 - Document ID: US9040609B2 - Status: Granted - Kind: B2 - Application number: 13/988,693 - Filed: 2011-11-23 - Published: 2014-03-06 - Granted: 2015-05-26 - Earliest claimed: 2010-11-29 - Assignees: Construction Research & Technology GmbH - Applicants: Jutta Karin Langlotz; Stefan Friedrich; Christoph Hesse - Inventors: Jutta Karin Langlotz; Stefan Friedrich; Christoph Hesse - Web page: https://patentgrep.com/patent/US9040609B2 ## CPC - C04B 14/043: {Alkaline-earth metal silicates, e.g. wollastonite} - C04B 24/2652: {Nitrogen containing polymers, e.g. polyacrylamides, polyacrylonitriles} - C04B 28/02: containing hydraulic cements other than calcium sulfates - C04B 40/0042: {Powdery mixtures} - C04B 2103/0062: {Cross-linked polymers} - C04B 2103/14: Hardening accelerators - C04B 2103/52: Grinding aids; Additives added during grinding - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE ## Abstract The present invention relates to a solid composition containing calcium silicate hydrate and at least one water-swellable polymer which can form a hydrogel, and also to a process for preparing the composition, to the use thereof as a setting accelerator, and as a grinding aid in cement production. It also relates to building material mixtures which comprise the compositions. ## Claims ### Claim 1 A solid composition comprising finely divided calcium silicate hydrate having a particle size of less than 500 nm and at least one water-swellable polymer which can form a hydrogel. ### Claim 2 (depends on 1) The composition according to claim 1, wherein the weight ratio of the water-swellable polymer which can form a hydrogel to the calcium silicate hydrate is from 1:10 to 3:1. ### Claim 3 (depends on 1) The composition according to claim 1, wherein the water-swellable polymer which can form a hydrogel is selected from the group of α) anionic crosslinked polyelectrolytes, β) cationic crosslinked polyelectrolytes, γ) ampholytic crosslinked polyelectrolytes, δ) nonionic crosslinked polymers, optionally nonionic crosslinked polymers from free-radical polymerization, and ε) combinations thereof. ### Claim 4 (depends on 3) The composition according to claim 3, wherein sulpho-containing structural units of the general formula (I) are present in the anionic crosslinked polyelectrolytes α), optionally in an amount of 5 to 99.99 mol %, in which R1 is identical or different and is represented by hydrogen or a methyl radical, R2, R3, R4 are each the same or different and are each independently represented by hydrogen, an aliphatic branched or unbranched hydrocarbyl radical having 1 to 6 carbon atoms and/or aromatic hydrocarbyl radical having 6 to 14 carbon atoms, M is the same or different and is represented by hydrogen, a mono- or divalent metal cation or an ammonium ion, a is the same or different and is represented by 1/2 or 1. ### Claim 5 (depends on 3) The composition according to claim 3, wherein cationic structural units which have a quaternized nitrogen atom and are of the general formula (II) are present in the cationic crosslinked polyelectrolytes β), optionally in an amount of 5 to 99.99 mol %, in which R1 is identical or different and is represented by hydrogen or a methyl radical, R7, R8, R9, R10 are each the same or different and are each independently represented by hydrogen, a branched or unbranched aliphatic hydrocarbyl radical having 1 to 20 carbon atoms, a cycloaliphatic hydrocarbyl radical having 5 to 8 carbon atoms or an aryl radical having 6 to 14 carbon atoms, m is the same or different and is represented by an integer from 1 to 6, X is the same or different and is represented by oxygen or N—R10, Y−a is the same or different and is represented by a halide, C1-C4-alkylsulphate, C1-C4-alkylsulphonate and/or sulphate, a is the same or different and is represented by 1/2 or 1. ### Claim 6 (depends on 3) The composition according to claim 3, wherein sulpho-containing structural units of the general formula (I) and cationic structural units which have a quaternized nitrogen atom and are of the general formula (II) are present in the γ) ampholytic crosslinked polyelectrolytes. ### Claim 7 (depends on 4) The composition according to claim 4, wherein (meth)acrylamido-containing structural units of the general formula (III) are present in the α) anionic crosslinked polyelectrolytes, in the β) cationic crosslinked polyelectrolytes or γ) in the ampholytic crosslinked polyelectrolytes, optionally in an amount of 30 to 94 mol %, in which R1 is as defined above, R5 and R6 are each the same or different and are each independently represented by hydrogen, a branched or unbranched aliphatic hydrocarbyl radical having 1 to 20 carbon atoms, a cycloaliphatic hydrocarbyl radical having 5 to 8 carbon atoms or an aryl radical having 6 to 14 carbon atoms. ### Claim 8 (depends on 3) The composition according to claim 3, wherein the δ) nonionic crosslinked polymers which can form a hydrogel contain (meth)acrylamido-containing structural units of the general formula (III). ### Claim 9 (depends on 1) The composition according to claim 1, wherein the water-swellable polymer which can form a hydrogel contains structural units which derive from monomers which have only one free-radically polymerizable, ethylenically unsaturated vinyl group, and crosslinking structural units which derive from monomers which have polyethylenically unsaturated vinyl groups. ### Claim 10 (depends on 9) The composition according to claim 9, wherein less than 40 mol % of carboxylic monomers, optionally monocarboxylic monomers, is present in the water-swellable polymers, based on the total number of moles of all monomers. ### Claim 11 (depends on 9) The composition according to claim 9, wherein the crosslinking structural units derive from monomers which are hydrolysed at a pH of 9 to 14 in an aqueous environment. ### Claim 12 (depends on 1) A process for producing optionally pulverulent compositions according to claim 1, wherein the following process steps are carried out: a) contacting an aqueous suspension, optionally suitable as a setting and hardening accelerator for cementitious binder systems, of calcium silicate hydrate with at least one water-swellable polymer which can form a hydrogel and b) drying the product from step a) at temperatures below 140° C. ### Claim 13 (depends on 12) The process according to claim 12, wherein the aqueous suspension of fine calcium silicate hydrate has been obtained by reacting a water-soluble calcium compound with a water-soluble silicate compound, the reaction of the water-soluble calcium compound with the water-soluble silicate compound being effected in the presence of an aqueous solution which optionally contains a water-soluble comb polymer which is suitable as a plasticizer for hydraulic binders. ### Claim 14 (depends on 12) The process according to claim 12, wherein there follows a process step c) which comprises the grinding of the dried products from process step b) to powders. ### Claim 15 (depends on 1) A setting accelerator comprising a composition according to claim 1, for use in building material mixtures comprising cement, slag sand, fly ash, silica dust, metakaolin, natural pozzolans, burnt oil shale and/or calcium aluminate cement, or in building material mixtures containing cement and binders based on calcium sulphate, optionally in building material mixtures which contain essentially cement as a hydraulic binder. ### Claim 16 (depends on 1) A grinding aid comprising a composition according to claim 1, for use in the preparation of cement. ### Claim 17 (depends on 1) Building material mixtures containing a composition according to claim 1 and i) cement, slag sand, fly ash, silica dust, metakaolin, natural pozzolans, burnt oil shale and/or calcium aluminate cement, or ii) cement and binders based on calcium sulphate, optionally mixtures which contain essentially cement as a hydraulic binder. ### Claim 18 (depends on 5) The composition according to claim 5, wherein (meth)acrylamido-containing structural units of the general formula (III) are present in the α) anionic crosslinked polyelectrolytes, in the β) cationic crosslinked polyelectrolytes or γ) in the ampholytic crosslinked polyelectrolytes, optionally in an amount of 30 to 94 mol %, in which R1 is as defined above, R5 and R6 are each the same or different and are each independently represented by hydrogen, a branched or unbranched aliphatic hydrocarbyl radical having 1 to 20 carbon atoms, a cycloaliphatic hydrocarbyl radical having 5 to 8 carbon atoms or an aryl radical having 6 to 14 carbon atoms. ### Claim 19 (depends on 6) The composition according to claim 6, wherein (meth)acrylamido-containing structural units of the general formula (III) are present in the α) anionic crosslinked polyelectrolytes, in the β) cationic crosslinked polyelectrolytes or γ) in the ampholytic crosslinked polyelectrolytes, optionally in an amount of 30 to 94 mol %, in which R1 is as defined above, R5 and R6 are each the same or different and are each independently represented by hydrogen, a branched or unbranched aliphatic hydrocarbyl radical having 1 to 20 carbon atoms, a cycloaliphatic hydrocarbyl radical having 5 to 8 carbon atoms or an aryl radical having 6 to 14 carbon atoms. ### Claim 20 (depends on 10) The composition according to claim 10, wherein the crosslinking structural units derive from monomers which are hydrolysed at a pH of 9 to 14 in an aqueous environment.