Powder dispersant for hydraulic compositions
AssigneeKao Corporation
InventorsDaisuke Shibai, Kyoichi Shirota
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Abstract
The present invention provides a powdery dispersant for hydraulic compositions, which is excellent in pumping before drying and in pressure resistance and humidity resistance, which comprises one or more copolymers obtained by polymerizing a specific vinyl monomer (1) such as an ethylenically unsaturated carboxylic acid derivative having a polyoxyalkylene group with a specific vinyl monomer (b) such as (meth)acrylic acid etc., wherein the average number of C2-4 oxyalkylene groups or oxystyrene groups added is 45 to 150, (a)/[(a)+(b)]×100 ranges from 15 to 45 (mol-%), and at least a part of the copolymers are monovalent or polyvalent metal salts.
Claims14
A method of dispersing a hydraulic composition, said method comprising adding a powdery dispersant to the hydraulic composition;
- wherein said powdery dispersant comprises at least one copolymer as a powder, wherein said copolymer is made by polymerizing at least one vinyl monomer (a) represented by the formula (1):
- wherein R1 and R2 represent a hydrogen atom or a methyl group, R3 represents a hydrogen atom or —COO(AO)nX, m is a number of 0 to 2, p is a number of 0 or 1, AO represents a C2-4 oxyalkylene group or an oxystyrene group, n is the average mole number of AO groups and is a number of 2 to 300, and X represents a hydrogen atom or a C1-18 alkyl group;
- with at least one vinyl monomer (b) represented by the formula (2):
- wherein R4, R5 and R6 are the same as or different from one another and each represent a hydrogen atom, a methyl group or —(CH2)m1COOM2 wherein —(CH2)m1COOM2 is optionally combined with —COOM1 or another —(CH2)m1COOM2 to produce an anhydride so that M1 and M2 of these groups are not present, each of M1 and M2 represents a hydrogen atom or a monovalent metal, and m1 is a number of 0 to 2,
- wherein the average mole number of C2-4 oxyalkylene groups or oxystyrene groups of said copolymer is 50 to 150;
- (a)/[(a)+(b)]×100 ranges from 15 to 45 (mole %);
- at least part of the copolymer is a monovalent metal salt;
- and a degree of neutralization of 50% to 90%.
A method of mixing a powdery dispersant for a hydraulic composition, said method comprising mixing the powdery dispersant with the hydraulic composition, wherein said powdery dispersant comprises at least one copolymer, wherein said copolymer is made by polymerizing at least one vinyl monomer (a) represented by the formula (1):
- wherein R1 and R2 represent a hydrogen atom or a methyl group, R3 represents a hydrogen atom or —COO(AO)nX, m is a number of 0 to 2, p is a number of 0 or 1, AO represents a C2-4 oxyalkylene group or an oxystyrene group, n is the average mole number of AO groups and is a number of 2 to 300, and X represents a hydrogen atom or a C1-18 alkyl group;
- with at least one vinyl monomer (b) selected from the group consisting of acrylic acid, methacrylic acid, an alkaline earth metal salt of acrylic acid, an alkaline earth metal salt of methacrylic acid and maleic anhydride;
- wherein the average mole number of C2-4 oxyalkylene groups or oxystyrene groups of said copolymer is 50 to 150;
- (a)/[(a)+(b)]×100 ranges from 15 to 45 (mole %);
- and
- at least part of the copolymer is an alkali metal salt;
- and a degree of an alkali metal salt;
- and a degree of neutralization of 50% to 90%.
A method of dispersing mortar with a powdery dispersant for a hydraulic composition, said method comprising dispersing said mortar with the powdery dispersant for the hydraulic composition, said powdery dispersant comprising at least one copolymer, wherein said copolymer is made by polymerizing at least one vinyl monomer (a) represented by the formula (1):
- wherein R1 and R2 represent a hydrogen atom or a methyl group, R3 represents a hydrogen atom or —COO(AO)nX, m is a number of 0 to 2, p is a number of 0 or 1, AO represents a C2-4 oxyalkylene group or an oxystyrene group, n is the average mole number of AO groups and is a number of 2 to 300, and X represents a hydrogen atom or a C1-18 alkyl group;
- with at least one vinyl monomer (b) selected from the group consisting of acrylic acid, methacrylic acid, an alkaline earth metal salt of acrylic acid, an alkaline earth metal salt of methacrylic acid and maleic anhydride;
- wherein the average mole number of C2-4 oxyalkylene groups or oxystyrene groups of said copolymer is 50 to 150;
- (a)/[(a)+(b)]×100 ranges from 15 to 45 (mole %);
- and
- at least part of the copolymer is an alkali metal salt;
- and a degree of neutralization of 50% to 90%. metal salt.
Dependencies are inferred from the claim text.