US 7,253,220 B2Granted

Cement admixture and cement composition

AssigneeNippon Shokubai Co., Ltd.

InventorsAkihiko Yamashita, Hiromichi Tanaka, Toru Uno, Yoshiyuki Onda, Tsuyoshi Hirata

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Abstract

The cement admixture of the present invention can improve the workability by displaying sufficient viscosity decreasing ability and initial dispersing ability even under a low temperature environment as well as high dispersing ability and dispersion retaining ability even in a high water reducing ratio range. The above-mentioned cement admixture comprises four components of a copolymer (A) containing a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from a maleic acid monomer (b), a specific unsaturated (poly)alkylene glycol ether monomer (a), a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group, and a polymer (C) having an oxyalkylene group or a polyoxyalkylene group and a carboxyl group, which is different from the copolymer (A).

Claims22

Dependent claims

An admixture for cement comprising four components of a copolymer (A), an unsaturated (poly)alkylene glycol ether monomer (a), a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group, and a polymer (C) having an oxyalkylene group or a polyoxyalkylene group and a carboxyl group, which is different from the copolymer (A), at ratios of the unsaturated (poly)alkylene glycol ether monomer (a) to the copolymer (A) in a range of 1 to 100% by mass, the non-polymerizable (poly)alkylene glycol (B) having no alkenyl group to the copolymer (A) in a range of 1 to 50% by mass, and the polymer (C), which is different from the copolymer (A), having an oxyalkylene group or a polyoxyalkylene group and a carboxyl group to the copolymer (A) in a range of 1 to 10000% by mass,

wherein the copolymer (A) contains a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from a maleic acid monomer (b) at ratios of the constituent unit (I) and the constituent unit (II) in a range of 1% by mass or more, respectively, in the entire constituent units,
and the unsaturated (poly)alkylene glycol ether monomer (a) is represented by the general formula (1):
Y1O(R1O)nR (1)
wherein Y1 represents an alkenyl group containing 2 to 4 carbon atoms, R2 represents a hydrogen atom or a hydrocarbon group containing 1 to 30 carbon atoms, R1O represents one or more species of oxyalkylene groups containing 2 to 18 carbon atoms, and n represents the average molar number of addition of the oxyalkylene groups and is a number of 1 to 500.

1 more element

An admixture for cement comprising five components of a copolymer (A1), a copolymer (A2), an unsaturated (poly)alkylene glycol ether monomer (a1), an unsaturated polyalkylene glycol ether monomer (a2), and a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group at ratios of the total amount of the unsaturated (poly)alkylene glycol ether monomer (a1) and the unsaturated polyalkylene glycol ether monomer (a2) to the total amount of the copolymers (A1) and (A2) in a range of 1 to 100% by mass, the non-polymerizable (poly)alkylene glycol (B) having no alkenyl group to the total amount of the copolymers (A1) and (A2) in a range of it 1 to 50% by mass, and the polymer (A2) to the copolymer (A1) in a range of 1 to 10000% by mass,

wherein the copolymer (A1) contains a constituent unit (I′) derived from the unsaturated (poly)alkylene glycol ether monomer (a1) and a constituent unit (II) derived from a maleic acid monomer (b) at ratios of the constituent unit (I′) and the constituent unit (II) in a range of 1% by mass or more, respectively, in the entire constituent units,
the unsaturated (poly)alkylene glycol ether monomer (a1) is represented by the general formula (2):
Y2O(R3O)m1R4 (2)
wherein Y2 represents an alkenyl group containing 2 to 4 carbon atoms, R4 represents a hydrogen atom or a hydrocarbon group containing 1 to 30 carbon atoms, R3O represents one or more species of oxyalkylene groups containing 2 to 18 carbon atoms, and m1 represents the average molar number of addition of the oxyalkylene groups and is a number of 1 to 100,
the copolymer (A2) contains a constituent unit (I″) derived from the unsaturated polyalkylene glycol ether monomer (a2) and a constituent unit (II) derived from a maleic acid monomer (b) at ratios of the constituent unit (I″) and the constituent unit (II) in a range of 1% by mass or more, respectively, in the entire constituent units, and
the unsaturated polyalkylene glycol ether monomer (a2) is represented by the general formula (3):
Y3O(R5O)m2R6 (3)
wherein Y3 represents an alkenyl group containing 2 to 4 carbon atoms, R6 represents a hydrogen atom or a hydrocarbon group containing 1 to 30 carbon atoms, R5O represents one or more species of oxyalkylene groups containing 2 to 18 carbon atoms, and m2 represents the average molar number of addition of the oxyalkylene groups and is a number of 6 to 500, in which m2−m1≧5.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/791,730Filed 4 Mar 2004
Priority: JP 2003-1044198 Apr 2003
Published: US 2004/0204517 A114 Oct 2004
Granted: 7 Aug 2007
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

C08G 65/3322
Containing carboxyl groups, or halides, or esters thereof: acyclic
C04B 28/02
Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic…
C04B 40/0039
Aspects relating to the mixing step of the mortar preparation: premixtures of ingredients
C08L 71/02
Compositions of polyethers obtained by reactions forming an ether link in the main chain ; Compositions of derivatives of such polymers:…