Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
  • C08G83/002—Dendritic macromolecules
  • C08G83/003—Dendrimers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/16—Sulfur-containing compounds
  • C04B24/161—Macromolecular compounds comprising sulfonate or sulfate groups
  • C04B24/163—Macromolecular compounds comprising sulfonate or sulfate groups obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/243—Phosphorus-containing polymers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2664—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers
  • C04B24/267—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers containing polyether side chains
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
  • C04B24/24—Macromolecular compounds
  • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/2688—Copolymers containing at least three different monomers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
  • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
  • C08F220/10—Esters
  • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
  • C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
  • C08F220/285—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety
  • C08F220/286—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety and containing polyethylene oxide in the alcohol moiety, e.g. methoxy polyethylene glycol (meth)acrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F228/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur
  • C08F228/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur by a bond to sulfur
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F230/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
  • C08F230/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing phosphorus
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
  • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
  • C08F290/06—Polymers provided for in subclass C08G
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
  • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
  • C08F290/06—Polymers provided for in subclass C08G
  • C08F290/061—Polyesters; Polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
  • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
  • C08F290/06—Polymers provided for in subclass C08G
  • C08F290/062—Polyethers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/0045—Polymers chosen for their physico-chemical characteristics
  • C04B2103/0063—Polymers chosen for their physico-chemical characteristics obtained by an unusual polymerisation process, e.g. by changing the molar ratio of the different monomers during the polymerisation process
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
  • C04B2103/302—Water reducers
• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
  • C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
  • C04B2103/32—Superplasticisers

Definitions

• the present invention relates to a novel water soluble copolymer and in particular to a novel copolymer for use in a mineral based composition, such as a cement composition.
• Said copolymer comprises structural units derived from at least one compound having at least two unsaturated groups, such as allyl and/or acryl groups, at least one alkoxypolyalkylene glycol or an ester thereof, at least one 2-propenesulphonate or phosphate and at least one unsaturated carboxylic acid or a corresponding anhydride.
• the present invention refers to a composition comprising cement and said copolymer, to a method for dispersing, by incorporation of said copolymer, a composition comprising cement and to the use of said copolymer as additive in a composition comprising cement.
• Additives have for a long time been used to control and/or adjust the properties of compositions comprising cement. These additives include porosity adjusting additives, flowability adjusting additives, curing accelerators, curing retardants, water reducing additives, plasticisers and the like. These additives can work surface chemically as well as chemically and the various mechanisms involved are not fully characterised.
• Frequently used additives include for instance formaldehyde resins, such as sulphonated naphthlene-formaldehyde resins and sulphonated amino-formaldehyde resins, salts of alkali metals and alkaline earth metals, lignosulphonic acids, water dilutable polymers and copolymers, such as water dilutable vinyl copolymers, polyalcohols, gypsum, silica and similar additives.
• formaldehyde resins such as sulphonated naphthlene-formaldehyde resins and sulphonated amino-formaldehyde resins
• salts of alkali metals and alkaline earth metals lignosulphonic acids
• water dilutable polymers and copolymers such as water dilutable vinyl copolymers, polyalcohols, gypsum, silica and similar additives.
• naphthalene and melamine resins are, for example, excellent in hardening characteristics, but exhibit, due to a tendency to cause slump loss, drawbacks in regard of fluidity retention.
• Polycarboxylic acid derivatives are disadvantaged due to retarding effects on the hardening properties of the cement composition.
• Water dilutable polymers and copolymers exhibit excellent dispersing and retardation properties even at low addition amounts. Prior art copolymers does, however, not have a satisfactorily long term effect on retention of fluidity.
• Cement compositions comprising polycarboxylic acid derivatives imparting excellent fluidity have recently been developed making it possible to obtain excellent dispersion with a reduced amount of additive, such as copolymers of polyalkylene glycol monoesters having a vinyl unsaturation derived from for instance acrylic acids and/or unsaturated dicarboxylic acids.
• additives comprising water dilutable vinyl copolymers of conventional types, such as those disclosed in US patents 4,962,173, 5,087,648, 5,290,869 and 5,362,829, have reduced slump loss, but exhibit problems in that setting times are longer and hence sufficient early strength cannot be obtained during the initial period of hardening.
• the present invention provides a novel copolymer useful as additive in compositions comprising cement.
• Said copolymer is typically a water soluble and water diluted product and can be used as such.
• Said copolymer also be produced, by for instance spray drying, as a dry substance and accordingly used as such.
• the copolymer of the present invention provides, as additive in cement containing compositions, improved water reducing ability, high early strength development, reduced shrinkage and decreased or even non-existing setting retardation, that is setting time can be kept constant and independent of dosage.
• the addition amount can, giving the same or similar flow properties, be reduced by up to 50% compared to for instance commercially available products.
• the copolymer of the present invention is a very- effective cement dispersing agent and/or fluidizer and exhibit very high water reducing potential without retardation of setting and/or water separation at higher dosages.
• Said copolymer can, furthermore, be designed to meet specific requirements and mixing proportions.
• the copolymer of the present invention comprises structural units derived from at least one compound (A), at least one compound (B), at least one compound (C) and at least one compound (D) and optionally at least one compound (E), whereby said at least one compound (A) is at least one compound having at least two groups of formula
• H l C C-R2 — I H wherein R 1 is -H or -CH 3 and wherein R 2 is a group of formula H O I II — C— O — or — c— O — I H
• compound (B) is at least one alkoxypolyalkylene glycol, alkoxypolyalkylene glycol acrylate, alkoxypolyalkylene glycol methacrylate, alkoxypolyalkylene glycol maleate or alkoxypolyalkylene glycol fumarate, compound (C) is at least one 2-propenesulphonate, 2-alkyl-2-propenesulphonate, 2-propenearenesulphonate, 2-alkyl-2-propenephosphate, 2-propenearenephosphate or 2-alkyl-2-propenearenephosphate, and compound (D) is at least one unsaturated carboxylic acid or a corresponding anhydride, and - optional compound (E) is at least one alkyl acrylate
• Said at least one compound (A) is in preferred embodiments of the copolymer of the present invention a di, tri or polyallyl and/or methallyl ether or a di, tri or polyacrylic and/or methacrylic ester of at least one 2,2-dialkyl-l,3-propanediol, 2-alkyl-2-hydroxyalkyl- -1,3-propanediol, 2,2-dihydroxyalkyl-l,3-propanediol or a said ether or a said ester of at least one dimer, trimer or polymer of at least one said 1,3-propanediol.
• said compound (A) include especially preferred compounds, such as at least one di, tri or polyallyl and/or methallyl ether or di, tri or polyacrylic and/or methacrylic ester of at least one alkoxylated 2,2-dialkyl-l,3-propanediol, 2-alkyl-2-hydroxyalkyl- -1,3-propanediol, 2,2-dihydroxyalkyl-l,3-propanediol or a said ether or ester of at least one alkoxylated dimer, trimer or polymer of at least one said 1,3-propanediol.
• Alkyl in above disclosure is preferably and independently a C 1 -C 12 , such as a C 2 ⁇ Cg, alkanyl and/or alkenyl.
• At least one compound (A) can be disclosed by di, tri or polyallyl and/or methallyl ethers and di, tri or polyacrylic and/or methacrylic esters of dendritic polymers, such as dendritic polyethers and polyesters.
• a said dendritic polyether is most preferably built up from a central nucleus derived from a di, tri or polyhydric alcohol and at least one dendritic branching generation built up from at least one oxetane of a tri or polyhydric alcohol and a said dendritic polyester is likewise most preferably built up from a central nucleus derived from a di, tri or polyhydric alcohol and at least one dendritic branching generation built up from at least one hydroxyfunctional carboxylic acid having at least two hydroxyl groups and one carboxyl group.
• a further suitable class of dendritic polyesters are represented by dendritic polyesters built up from a polyhydric nucleus and dendritic branching derived from anhydrides of polycarboxylic acid and for instance glycidyl compounds.
• Said dendritic polymers can optionally and advantageously be further chain extended by reaction with for instance at least one alkylene oxide, such as ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,3-butylene oxide, 2,4-butylene oxide, cyclohexene oxide, butadiene monoxide, and/or a corresponding glycol.
• dendritic polymers are disclosed in the published International ' Patent Applications WO 93/17060, WO 93/18075, WO 96/07688, WO 96/12754, WO 00/56802 and WO 01/16213 and WO 02/040572, which all are included herein as disclosure of preferred dendritic polymers.
• At least one compound (A) include allyl and/or methallyl ethers and acrylic and/or methacrylic esters of alkoxylated bisphenols, such as ethoxylated bisphenol A.
• Said at least one compound (A) is in especially preferred embodiments trimethylolethane di or triallyl and or methallyl ether, trimethylolpropane di or triallyl and/or methallyl ether, pentaerythritol di, tri or tetraallyl and/or methallyl ether, ditrimethylolethane di, tri or tetraallyl and/or methallyl ether, ditrimethylolpropane di, tri or tetraallyl and/or methallyl ether or dipentaerythritol di, tri, tetra, penta and/or hexaallyl and/or methallyl ether or is a di, tri or polyallyl and/or methacrylic
• the most preferred of these embodiments include di and triallyl and/or methallyl ethers of ethoxylated trimethylolpropane, di, tri or tetraallyl and/or methallyl ethers of ethoxylated pentaerythritol and di, tri, tetra, penta or hexaallyl and/or methallyl ethers of ethoxylated dipentaerythritol.
• An alkoxylated di, tri or polyhydric alcohol, an alkoxylated dendritic polymer and/or an alkoxylated bisphenol as disclosed above has preferably an alkoxylation degree of 0.5-50, such as 1-20 or 3-15, moles of at least one alkylene oxide or a corresponding glycol on 1 mole of said alcohol, polymer and/or bisphenol.
• Said alkylene oxide is preferably ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,3-butylene oxide, 2,4-butylene oxide, cyclohexene oxide, butadiene monoxide and/or phenylethylene oxide.
• Said at least one compound (B), alkoxypolyalkylene compound has preferably 10-4000, such as 20-1000, 20-600, 20-400, 20-100, 40-600, 40-200, 40-100 or most preferably 20-80, C 2 -C 4 oxyalkylene groups, which oxyalkylene groups are derived from for instance ethylene oxide, propylene oxide, 1,2-butylene oxide, 1,3-butylene oxide, 2,4-butylene oxide or a corresponding glycol.
• Alkoxy is here preferably methoxy, propoxy, ethoxy, butoxy, phenoxy and/or ethylphenoxy.
• Said at least one compound (B) can suitably be exemplified by methoxypoly ethylene glycol, methoxypolyethylene glycol acrylate, methoxypolyethylene glycol methacrylate, methoxypolyethylene glycol maleate and methoxypolyethylene glycol fumarate having for instance said 20-4000 oxyethylene groups.
• Said at least one compound (C) is in various embodiments of the present invention preferably an alkali metal 2-propenesulphonate or arenesulphonate, 2-methyl-2-propenesulphonate or arenesulphonate and or 2-ethyl-2-propenesulphonate or arenesulphonate.
• Said alkali metal is preferably sodium and/or potassium.
• Said at least one compound (D) is preferred embodiments, of the copolymer of the present invention, acrylic acid, methacrylic acid, crotonic acid, w ⁇ -crotonic acid, fumaric acid and/or maleic acid or anhydride.
• Said at least one optional compound (E) is suitably and preferably at least one Ci-Cg alkyl acrylate, alkyl methacrylate, glycidyl acrylate, glycidyl methacrylate, alkyl glycidyl acrylate, alkyl glycidyl methacrylate, alkyl or dialkyl maleate and/or alkyl or dialkyl fumarate, such as methyl acrylate, ethyl acrylate, butyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and/or dibutyl maleate.
• At least one optional compound (E) include acrylates, methacrylates, maleates and fumarates of cyclic formals of trimethylolethane, trimethylolpropane and pentaerythritol, such as an acrylate, methacrylate, maleate or fumarate of 5-methyl-5-hydroxyalkyl-l,3-dioxane, 5-ethyl-5-hydroxymethyl- -1,3-dioxane or 5,5-dihydroxymethyl-l,3-dioxane.
• the present invention refers to an additive intended to be used in a composition comprising cement.
• Said additive comprises at least one copolymer according to the present invention, such as a said water diluted or dry copolymer, and optionally in addition thereto at least one cyclic formal of for instance at least one 2-alkyl-2-hydroxyalkyl- 1,3-propanediol or 2,2,-dihydroxyalkyl-l,3-propanediol.
• Said at least one cyclic formal can be exemplified by cyclic formals of trimethylolethane, trimethylolpropane or pentaerythritol, such as 5-methyl- -5-hyc oxyalkyl-l,3-dioxane, 5-ethyl-5-hydroxymethyl-l,3-dioxane and 5,5-dihydroxy- methyl- 1,3-dioxane.
• the copolymer of the present invention is suitably built up in a single reaction step or in two or more subsequent and/or repeated reaction steps, said step or steps being performed to yield a copolymer having a molecular weight of preferably 10000-100000, such as 10000-50000, 15000-30000, 17000-23000, 15000-65000, 18000-35000 or most preferably 20000-25000.
• Said copolymer can suitably be produced by free radical polymerisation in a redox process, such as a batch process using for instance water as solvent, a batch process without solvent or a continuos monomer feeding process.
• a redox process as above includes preferably a reductant, such as sodium pyrosulphite and/or sodium hypophosphite together with a radical oxidant, such as potassium persulphate and/or sodium persulphate.
• the reductant decreases activation temperature of the radical oxidant used in the redox system.
• Other redox systems are of course also possible to use.
• Preferred radical initiators are, however, water soluble, and examples of such water soluble radical initiators include potassium persulphate, ammonium persulphate, hydrogen peroxide and 2,2'-azo-bis(2-amidinopropane) dihydrochloride. They can also be used as a redox initiator by combining them with a reducing agent such as sulphites and L-ascorbic acid or an amine. A chain transfer agent, end molecule, such as mercaptopropionic acid, thiomalic acid and the like may also advantageously be used. Further suitable processes for production of said copolymer include living radical polymerisation, and non-redox systems using for instance ammonium persulphate.
• the structural design of the present copolymer can readily be varied, to meet specific and/or desired properties, by the use of the various embodiment monomers, different reaction conditions and/or the like.
• the present invention refers to a composition comprising cement and as additive at least one copolymer as disclosed above in an amount of for instance between 0.01 and 1%, such as 0.2-0.6% or 0.3-0.5%, by weight based on the cement included in said composition, to a method for dispersion, by incorporation of at least one copolymer as disclosed above, of a composition comprising cement and to the use of a copolymer as disclosed above as additive in a composition comprising cement.
• the copolymer of the present invention is suitably used as for instance as a high range water reducing additive and/or as a superplasticiser.
• Water reducing agents can typically be divided into two classes, namely water reducing agents (WR) and high range water reducing agents (HRWR).
• Copolymers of the present invention can serve as a cement dispersing agents and can be applicable to many kinds of hydraulic cement compositions, such as concrete comprising cement, coarse and fine aggregates and water, cement pastes comprising only cement and water, and mortars.
• hydraulic cement compositions such as concrete comprising cement, coarse and fine aggregates and water, cement pastes comprising only cement and water, and mortars.
• the types of cement which can be used in such hydraulic cement compositions include all kinds of Portland cement, fly ash cement, Portland blast-furnace slag cement, Portland pozzolan cement and most kinds of blended cements.
• reaction product was finally cooled to 25 °C and pH was adjusted 5.8 with potassium hydroxide.
• the polymerisation yielded a 30% water solution of a copolymer according to an embodiment of the present invention.
• the polymerisation yielded a 30% water solution of a copolymer according to an embodiment of the present invention.
• reaction product was finally cooled to 25°C and pH was adjusted to 5.8 with potassium hydroxide.
• the polymerisation yielded a 30% water solution of a copolymer according to an embodiment of the present invention.
• the polymerisation yielded a 30%) water solution of a copolymer according to an embodiment of the present invention.
• the polymerisation yielded a 30% water solution of a copolymer according to an embodiment of the present invention.
• the polymerisation yielded a 30%> water solution of a copolymer according to an embodiment of the present invention.
• the polymerisation yielded a 30%> water solution of a copolymer according to an embodiment of the present invention.
• the polymerisation yielded a 30% water solution of a copolymer according to an embodiment of the present invention.
• Cement pastes were prepared in accordance with Example 9 at three different dosages of said dispersing agent.
• the setting time of said cement pastes were determined according to EN 12390-4 at 20°C and 50% relative humidity.
• compositions were prepared from Embra cement CEM I, Limus 15 (CaCU 3 ), fine aggregates and coarse aggregates and a cement dispersing agent mixed with an antifoaming agent and water. Said components were in order charged in a pan-type mixer having a capacity of 50 litres.
• the copolymers synthesised in Examples 1, 2, 3 and 6 were used as cement dispersing agents and two commercially available cement dispersing agents were used as references (MightyTM 21ES, Kao Corp., Japan and SokolanTM HP80, BASF AG, Germany).
• the antifoaming agent were of the fatty acid polyglycol ester type. Mixing was carried at 20°C for
• compositions are given i Table 3 below.
• the slump flow was measured immediately, 30 and 60 minutes after mixing using a slump cone conforming to EN 12350.
• the compressive strength after 24 hours was determined according to EN 480-2.

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• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Health & Medical Sciences (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Macromonomer-Based Addition Polymer (AREA)
• Curing Cements, Concrete, And Artificial Stone (AREA)

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Cited By (14)

Citations (8)

• 2003
  • 2003-09-18 SE SE0302485A patent/SE526347C2/sv not_active IP Right Cessation
• 2004
  • 2004-09-15 WO PCT/SE2004/001329 patent/WO2005026223A1/en active Application Filing

Patent Citations (8)

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