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US 2011/0086947 A1Published application
Admixture for a hydraulic binder
AssigneeLafarge Gypsum International
InventorsLaurent Meunier, David Rinaldi, Hakimi Yahiaoui, Jean-Michel Faure
Life of this patent
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Abstract
A method of using an admixture in hydraulic binders, in particular in plaster-based or anhydrous calcium sulphate-based compounds, the admixture being an acrylic polymer with controlled end chains.
Claims19
A method of using at least one polymer or a salt thereof as an admixture for hydraulic binders, said polymer being of formula (I)
- Z—P—Z′ (I)
- in which
- Z is an end chain and represents a hydrogen atom, a hypophosphite group or a phosphonate group;
- Z′ is an end chain and represents a hypophosphite group or a phosphonate group;
- P represents a component comprising at least one moiety of formula (II)
- in which
- R1, R2 and R3 independently represent a hydrogen atom, a linear or branched C1 to C20 alkyl radical, or a —(CH2)p—COOR radical or an ionized form thereof where p is equal to 0 or 1, and R is a hydrogen atom or R is a C1 to C6 alkyl radical;
- R4 represents a hydrogen atom, a monovalent, divalent or trivalent ion, or a quaternary ammonium radical;
- and optionally comprising at least one moiety of formula (III)
- R5, R6 and R7 independently represent a hydrogen atom, a linear or branched C1 to C20 alkyl radical, or a —(CH2)n—(C═O)m—W—(R8-O)q—R9 radical;
- R8 represents a linear or branched C2 to C20 alkyl radical;
- R9 represents a hydrogen atom, or a linear or branched C1 to C20 alkyl radical;
- W represents an oxygen or nitrogen atom;
- n is an integer comprised from 0 to 2;
- m is an integer equal to 0 or 1;
- q is an integer comprised from 0 to 200;
- and in which the degree of polymerisation is comprised from 5 to 200.
14 more elements
A method comprising adding at least one polymer or a salt thereof to an hydraulic binder, said polymer being of formula (I)
- Z—P—Z′ (I)
- in which
- Z is an end chain and represents a hydrogen atom, a hypophosphite group or a phosphonate group;
- Z′ is an end chain and represents a hypophosphite group or a phosphonate group;
- P represents a component comprising at least one moiety of formula (II)
- in which
- R1, R2 and R3 independently represent a hydrogen atom, a linear or branched C1 to C20 alkyl radical, or a —(CH2)p—COOR radical or an ionized form thereof where p is equal to 0 or 1, and R is a hydrogen atom or R is a C1 to C6 alkyl radical;
- R4 represents a hydrogen atom, a monovalent, divalent or trivalent ion, or a quaternary ammonium radical;
- and optionally comprising at least one moiety of formula (III)
- R5, R6 and R7 independently represent a hydrogen atom, a linear or branched C1 to C20 alkyl radical, or a —(CH2)n-(C═O)m—W—(R8-O)q—R9 radical;
- R8 represents a linear or branched C2 to C20 alkyl radical;
- R9 represents a hydrogen atom, or a linear or branched C1 to C20 alkyl radical;
- W represents an oxygen or nitrogen atom;
- n is an integer comprised from 0 to 2;
- m is an integer equal to 0 or 1;
- q is an integer comprised from 0 to 200;
- and in which the degree of polymerisation is comprised from 5 to 200.
14 more elements
A hydraulic binder comprising at least one polymer or a salt thereof, said polymer being of formula (I)
- Z—P—Z′ (I)
- in which
- Z is an end chain and represents a hydrogen atom, a hypophosphite group or a phosphonate group;
- Z′ is an end chain and represents a hypophosphite group or a phosphonate group;
- P represents a component comprising at least one moiety of formula (II)
- in which
- R1, R2 and R3 independently represent a hydrogen atom, a linear or branched C1 to C20 alkyl radical, or a —(CH2)p—COOR radical or an ionized form thereof where p is equal to 0 or 1, and R is a hydrogen atom or R is a C1 to C6 alkyl radical;
- R4 represents a hydrogen atom, a monovalent, divalent or trivalent ion, or a quaternary ammonium radical;
- and optionally comprising at least one moiety of formula (III)
- R5, R6 and R7 independently represent a hydrogen atom, a linear or branched C1 to C20 alkyl radical, or a —(CH2)n—(C═O)m—W—(R8-O)q—R9 radical;
- R8 represents a linear or branched C2 to C20 alkyl radical;
- R9 represents a hydrogen atom, or a linear or branched C1 to C20 alkyl radical;
- W represents an oxygen or nitrogen atom;
- n is an integer comprised from 0 to 2;
- m is an integer equal to 0 or 1;
- q is an integer comprised from 0 to 200;
- and in which the degree of polymerisation is comprised from 5 to 200.
14 more elements
Dependencies are inferred from the claim text.