Dispersant for a hydraulic composition
AssigneeKao Corporation
InventorsKeiichiro Sagawa, Masaaki Shimoda, Koji Nagasawa
Life of this patent
Estimating the term…
Abstract
The present invention provides a dispersant for a hydraulic composition containing N-methyldiethanolamine and a specific (meth)acrylic acid copolymer as a polycarboxylic acid copolymer dispersing agent to increase the fluidity of a hydraulic composition.
Claims18
1-17. (canceled)
A dispersant for a hydraulic composition, comprising N-methyldiethanolamine and a copolymer having a constituent unit represented by the formula (1) and a constituent unit represented by the formula (2):
- wherein, R1 represents a hydrogen atom or a methyl group;
- and M1 represents a hydrogen atom or a counter ion to form a salt;
- and
- wherein, R2 represents a hydrogen atom or a methyl group;
- AO represents an alkyleneoxy group having 2 to 4 carbon atoms;
- l is a number of 0 to 2;
- m is a number of 0 or 1;
- n is an average added mole number of AO and is a number of 2 to 300;
- and R3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
A hydraulic composition, comprising N-methyldiethanolamine, a copolymer having a constituent unit represented by the formula (1) and a constituent unit represented by the formula (2), a hydraulic powder, an aggregate, and water, wherein a weight ratio of the water to the hydraulic powder, water/hydraulic powder, is 0.20 to 0.50:
- wherein, R1 represents a hydrogen atom or a methyl group;
- and M1 represents a hydrogen atom or a counter ion to form a salt;
- and
- wherein, R2 represents a hydrogen atom or a methyl group;
- AO represents an alkyleneoxy group having 2 to 4 carbon atoms;
- l is a number of 0 to 2;
- m is a number of 0 or 1;
- n is an average added mole number of AO and is a number of 2 to 300;
- and R3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
A method of increasing fluidity of a hydraulic composition, which comprises adding a dispersant to a hydraulic composition, wherein the dispersant comprises N-methyldiethanolamine and a copolymer having a constituent unit represented by the formula (1) and a constituent unit represented by the formula (2):
- wherein, R1 represents a hydrogen atom or a methyl group;
- and M1 represents a hydrogen atom or a counter ion to form a salt;
- and
- wherein, R2 represents a hydrogen atom or a methyl group;
- AO represents an alkyleneoxy group having 2 to 4 carbon atoms;
- l is a number of 0 to 2;
- m is a number of 0 or 1;
- n is an average added mole number of AO and is a number of 2 to 300;
- and R3 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
Dependencies are inferred from the claim text.