Cement admixture and cement composition

A cement composition, comprising cement, a cement admixture, and water, wherein the cement admixture includes either or both of copolymer (A) and copolymer (B):

• copolymer (A) which includes constitutional unit (I) of general formula (1) below and constitutional unit (II) of general formula (2) below as essential constitutional units and may further include constitutional unit (III) of general formula (3) below, wherein the content of constitutional unit (III) is 45 weight % or less of copolymer (A), and wherein copolymer (A) may further include a further constitutional unit that is a monomer unit of a further monomer, wherein said further monomer is copolymerizable with monomers (a), (b) and (c), wherein constitutional unit (I) is a monomer unit of monomer (a), wherein constitutional unit (II) is a monomer unit of monomer (b) and wherein constitutional unit (III) is a monomer unit of monomer (c);
• and
• copolymer salt (B) which is obtained by further neutralizing copolymer (A) with an alkaline substance;
• wherein general formula (1) is
• and general formula (2) is
• wherein:
• each of R1O and R3O denotes an oxyalkylene group with 2 to 18 carbon atoms or a mixture of two or more thereof, wherein the mixture may be formed by either block addition or random addition;
• each of m and n is an average molar number of addition of the oxyalkylene groups;
• m is 10-300 and n is 110-300, or m is 110-300 and n is 10-300;
• and each of R2 and R4 denotes an aliphatic or alicyclic hydrocarbon group with 1 to 30 carbon atoms, and
• wherein general formula (3) is
• wherein:
• R5, R6 and R7, independently of each other, denote a hydrogen atom, a methyl group or a (CH2)pCOOX group;
• X denotes a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group or an organic amine group;
• and p denotes an integer of 0 to 2;
• wherein two COOX groups, if present, may form an anhydride.

A cement composition, comprising cement, a cement admixture, and water, wherein the cement admixture includes either or both of copolymer (A) and copolymer (B):

• copolymer (A) which includes constitutional unit (I) of general formula (1) below and constitutional unit (II) of general formula (2) below as essential constitutional units and further includes constitutional unit (III) of general formula (3) below, wherein copolymer (A) may further include a further constitutional unit that is a monomer unit of a further monomer, wherein said further monomer is copolymerizable with monomers (a), (b) and (c), wherein constitutional unit (I) is a monomer unit of monomer (a), wherein constitutional unit (II) is a monomer unit of monomer (b) and wherein constitutional unit (III) is a monomer unit of monomer (c);
• and
• copolymer salt (B) which is obtained by further neutralizing copolymer (A) with an alkaline substance;
• wherein general formula (1) is
• and general formula (2) is
• wherein:
• each of R1O and R3O denotes an oxyalkylene group with 2 to 18 carbon atoms or a mixture of two or more thereof, wherein the mixture may be formed by either block addition or random addition;
• each of m and n is an average molar number of addition of the oxyalkylene groups and denotes a positive number of 10 or more;
• and each of R2 and R4 denotes an aliphatic or alicyclic hydrocarbon group with 1 to 30 carbon atoms,
• wherein general formula (3) is
• wherein:
• R5, R6 and R7, independently of each other, denote a hydrogen atom, a methyl group or a (CH2)pCOOX group;
• X denotes a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group or an organic amine group;
• and p denotes an integer of 0 to 2;
• wherein two
• wherein the ratio of constitutional unit (I)/constitutional unit (II)/constitutional unit (III)/said further constitutional unit is 5-93/5-93/2-40/0-50 weight %.

A cement composition, comprising cement, a cement admixture, and water, wherein the cement admixture includes either or both of copolymer (C) and copolymer (D):

• copolymer (C) which is obtained by copolymerizing comonomers, with said comonomers including monomer (a) of general formula (4) below and monomer (b) of general formula (5) below, wherein said comonomers may further include unsaturated carboxylic monomer (c) in a ratio of 45 weight % or less of said comonomers, and wherein said comonomers may further include a further monomer which is copolymerizable with monomers (a), (b) and (c);
• and
• copolymer salt (D) which is obtained by further neutralizing copolymer (C) with an alkaline substance;
• wherein general formula (4) is
• and general formula (5) is
• wherein:
• each of R1O and R3O denotes an oxyalkylene group with 2 to 18 carbon atoms or a mixture of two or more thereof, wherein the mixture may be formed by either block addition or random addition;
• each of m and n is an average molar number of addition of the oxyalkylene groups;
• both m and n are 10 or more and m and n are the same number;
• and each of R2 and R4 denotes an aliphatic or alicyclic hydrocarbon group with 1 to 30 carbon atoms.

A cement composition, comprising cement, a cement admixture, and water, wherein the cement admixture includes either or both of copolymer (C) and copolymer (D):

• copolymer (C) which is obtained by copolymerizing comonomers, with said comonomers including monomer (a) of general formula (4) below and monomer (b) of general formula (5) below, wherein said comonomers may further include unsaturated carboxylic monomer (c) in a ratio of 45 weight % or less of said comonomers, and wherein said comonomers may further include a further monomer which is copolymerizable with monomers (a), (b) and (c);
• and
• copolymer salt (D) which is obtained by further neutralizing copolymer (C) with an alkaline substance;
• wherein general formula (4) is
• and general formula (5) is
• wherein:
• each of R1O and R3O denotes an oxyalkylene group with 2 to 18 carbon atoms or a mixture of two or more thereof, wherein the mixture may be formed by either block addition or random addition;
• each of m and n is an average molar number of addition of the oxyalkylene groups;
• m is 10-300 and n is 110-300, or m is 110-300 and n is 10-300;
• and each of R2 and R4 denotes an aliphatic or alicyclic hydrocarbon group with 1 to 30 carbon atoms.

A cement composition, comprising cement, a cement admixture, and water, wherein the cement admixture includes either or both of copolymer (C) and copolymer (D):

• copolymer (C) which is obtained by copolymerizing comonomers, with said comonomers including monomer (a) of general formula (4) below and monomer (b) of general formula (5) below, wherein said comonomers further include unsaturated carboxylic monomer (c), and wherein said comonomers may further include a further monomer which is copolymerizable with monomers (a), (b) and (c);
• and
• copolymer salt (D) which is obtained by further neutralizing copolymer (C) with an alkaline substance;
• wherein general formula (4) is
• and general formula (5) is
• wherein:
• each of R1O and R3O denotes an oxyalkylene group with 2 to 18 carbon atoms or a mixture of two or more thereof, wherein the mixture may be formed by either block addition or random addition;
• each of m and n is an average molar number of addition of the oxyalkylene groups and denotes a positive number of 10 or more;
• and each of R2 and R4 denotes an aliphatic or alicyclic hydrocarbon group with 1 to 30 carbon atoms;
• and
• wherein the ratio of monomer (a)/monomer (b)/monomer (c)/said further monomer is 5-93/5-93/2-40/0-50 weight %.