US 5,854,318 AGranted

Cement additive, method for producing the same, and cement composition

AssigneeNippon Shokubai Kagaku Kogyo Co., Ltd.

InventorsHideyuki Tahara, Hiroshi Ito, Yasuhiro Mori, Makoto Mizushima

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Abstract

A cement additive is added to increase flowability of a cement composition and to prevent a slump loss, but those characters are insufficient, or the cement additive becomes ununiform in the cement composition and causes a trouble of the hardening inferiority. Thus, to solve the subjects, the present invention provides a cement additive composed of a crosslinked polymer in which, between main chains having a water-soluble polymer structure of a molecular weight from 500 to 100,000, a bond having as a structural unit at least one group selected from divalent groups as shown in the following formula (I) is formed. ##STR1## In the formula (I), R.sup.1 and R.sup.2 independently denote any one of the following. ##STR2## However, R.sup.1 may not be required in a case of that R.sup.2 is the following. ##STR3## Moreover, R and R' independently denote an alkyl group of carbon number of 1 to 5.!

Claims38

Dependent claims

A hydraulic composition comprising a hydraulic material, water and a cement additive comprising a crosslinked polymer in which, between main chains having a water-soluble polymer structure of a weight average molecular weight from 500 to 100,000, a bond having as a structural unit at least one divalent group having the following formula (I) is formed ##STR28## wherein R.sup.1 and R.sup.2 independently are selected from the group consisting of:

##STR29## with the proviso that R.sup.1 is not required if R.sup.2 is ##STR30## and wherein R and R' independently denote an alkyl group of carbon number of 1 to 5,
wherein said main chains comprise at least one member selected from the group consisting of ##STR31## wherein m is 0 or an integral number of 1 to 50;
n is 0 or 1;
M is at least one member selected from the group consisting of a hydrogen atom, a monovalent, divalent or trivalent metal group, an ammonium group and an organic amine group;
R.sup.1 and R.sup.6 independently denote an alkylene group of carbon number 2 to 4;
R.sup.7 denotes an alkylene group of carbon number 1 to 5;
with the proviso that when m is at least 2, a plurality of R.sup.5 O may be the same or different and, when a plurality of R.sup.5 O are different from one another, their arrangement may be regular or irregular;
and wherein said crosslinked polymer is capable of forming a water-soluble polymer by cleavage of the divalent group in an alkaline medium.

5 more elements

A hydraulic composition comprising a hydraulic material, water and a cement additive obtained from a method for producing a cement additive which comprises obtaining a crosslinked polymer by combining water-soluble polymers having a weight average molecular weight of 500 to 100,000 to one another by using a crosslinking agent which has a structural unit or is capable of forming at least one divalent group having the following formula (I):

##STR37## wherein R.sup.1 and R.sup.2 independently are selected from the group consisting of:
##STR38## with the proviso that R.sup.1 is not required if R.sup.2 is ##STR39## and wherein R and R' independently denote an alkyl group of carbon number of 1 to 5,
wherein the water-soluble polymer comprises at least one member selected from the group consisting of ##STR40## wherein m is 0 or an integral number of 1 to 50;
n is 0 or 1;
M is at least one member selected from the group consisting of a hydrogen atom, a monovalent, divalent or trivalent metal group, an ammonium group and an organic amine group;
R.sup.5 and R.sup.6 independently denote an alkylene group of carbon number 2 to 4;
R.sup.7 denotes an alkylene group of carbon number 1 to 5;
with the proviso that when m is at least 2, a plurality of R.sup.5 O may be the same or different and when a plurality of R.sup.5 O are different from one another, their arrangement may be regular or irregular;
and wherein said crosslinked polymer is capable of forming a water-soluble polymer by cleavage of the divalent group in an alkaline medium.

6 more elements

A hydraulic composition comprising a hydraulic material, water and a cement additive obtained from a method for producing a cement additive which comprises obtaining a crosslinked polymer by a polymerization reaction of a monomer (e), which has at least two polymerizable double bonds and has as a structural unit at least one divalent group having the below- described formula (I) between the double bonds, with a monomer (f), which has one polymerizable double bond capable of copolymerizing with the double bond in (e) and is able to form a main chain structure capable of leading to a water-soluble polymer of a weight average molecular weight of 500 to 100,000 ##STR51## wherein R.sup.1 and R.sup.2 independently are selected from the group consisting of:

##STR52## with the proviso that R.sup.1 is not required if ##STR53## and wherein R and R' independently denote an alkyl group of carbon number of 1 to 5,
wherein the water-soluble polymer comprises at least one member selected from the group consisting of ##STR54## wherein m is 0 or an integral number of 1 to 50;
n is 0 or 1;
M is at least one member selected from the group consisting of a hydrogen atom, a monovalent, divalent or trivalent metal group, an ammonium group and an organic amine group;
R.sup.5 and R.sup.6 independently denote an alkylene group of carbon number 2 to 4;
R.sup.7 denotes an alkylene group of carbon number 1 to 5;
with the proviso that when m is at least 2, a plurality of R.sup.5 O may be the same or different and, when a plurality of R.sup.5 O are different from one another, their arrangement may be regular or irregular;
and wherein said crosslinked polymer is capable of forming a water-soluble polymer by cleavage of the divalent group in an alkaline medium.

5 more elements

A method of dispersing a hydraulic material, comprising mixing a cement additive, water and a hydraulic material, wherein said cement additive comprises a crosslinked polymer in which, between main chains having a water-soluble polymer structure of a weight average molecular weight from 500 to 100,000, a bond having as a structural unit at least one divalent group having the following formula (I) is formed ##STR64## wherein R.sup.1 and R.sup.2 independently are selected from the group consisting of:

##STR65## with the proviso that R' is not required if ##STR66## and wherein R and R.sup.1 independently denote an alkyl group of carbon number of 1 to 5,
wherein said main chains comprise at least one member selected from the group consisting of ##STR67## wherein m is 0 or an integral number of 1 to 50;
n is 0 or 1;
M is at least one member selected from the group consisting of a hydrogen atom, a monovalent, divalent or trivalent metal group, an ammonium group and an organic amine group;
R.sup.5 and R.sup.6 independently denote an alkylene group of carbon number 2 to 4;
R.sup.7 denotes an alkylene group of carbon number 1 to 5;
with the proviso that when m is at least 2, a plurality of R.sup.5 O may be the same or different and, when a plurality of R.sup.5 O are different from one another, their arrangement may be regular or irregular;
and said crosslinked polymer forming said water-soluble polymer by cleavage of the divalent group of said crosslinked polymer, in an alkaline medium to maintain dispersion of said hydraulic material to water.

5 more elements

A method of dispersing a hydraulic material comprising mixing a cement additive, water and a hydraulic material, wherein said cement additive is obtained from a method for producing a cement additive which comprises obtaining a crosslinked polymer by combining water-soluble polymers having a weight average molecular weight of 500 to 100,000 to one another by using a crosslinking agent which has a structural unit or is capable of forming at least one divalent group having the following formula (I):

##STR73## wherein R.sup.1 and R.sup.2 independently are selected from the group consisting of:
##STR74## with the proviso that R.sup.1 is not required if R.sup.2 is ##STR75## and wherein R and R' independently denote an alkyl group of carbon number of 1 to 5,
wherein the water-soluble polymer comprises at least one member selected from the group consisting of ##STR76## wherein m is 0 or an integral number of 1 to 50;
n is 0 or 1;
M is at least one member selected from the group consisting of a hydrogen atom, a monovalent, divalent or trivalent metal group, an ammonium group and an organic amine group;
R.sup.5 and R.sup.6 independently denote an alkylene group of carbon number 2 to 4;
R.sup.7 denotes an alkylene group of carbon number 1 to 5;
with the proviso that when m is at least 2, a plurality of R.sup.5 O may be the same or different and when a plurality of R.sup.5 O are different from one another, their arrangement may be regular or irregular;
and said crosslinked polymer forming a water-soluble polymer by cleavage of the divalent group of said crosslinked polymer in an alkaline medium.

6 more elements

A method of dispersing a hydraulic material, comprising mixing a cement additive, water and a hydraulic material, wherein said cement additive is obtained from a method for producing a cement additive which comprises obtaining a crosslinked polymer by a polymerization reaction of a monomer (e), which has at least two polymerizable double bonds and has as a structural unit at least one divalent group having the below-described formula (I) between the double bonds, with a monomer (f), which has one polymerizable double bond capable of copolymerizing with the double bond in (e) and is able to form a main chain structure capable of leading to a water-soluble polymer of a weight average molecular weight of 500 to 100,000 ##STR87## wherein R.sup.1 and R.sup.2 independently are selected from the group consisting of:

##STR88## with the proviso that R.sup.1 is not required if ##STR89## and wherein R and R' independently denote an alkyl group of carbon number of 1 to 5,
wherein the water-soluble polymer comprises at least one member selected from the group consisting of ##STR90## wherein m is 0 or an integral number of 1 to 50;
n is 0 or 1;
M is at least one member selected from the group consisting of a hydrogen atom, a monovalent, divalent or trivalent metal group, an ammonium group and an organic amine group;
R.sup.5 and R.sup.6 independently denote an alkylene group of carbon number 2 to 4;
R.sup.7 denotes an alkylene group of carbon number 1 to 5;
with the proviso that when m is at least 2, a plurality of R.sup.5 O may be the same or different and, when a plurality of R.sup.5 O are different from one another, their arrangement may be regular or irregular;
and wherein said crosslinked polymer is capable of forming a water-soluble polymer by cleavage of the divalent group in an alkaline medium.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/759,435Filed 5 Dec 1996 · continuation
Priority: JP 1-19065625 Jul 1989
Granted: 29 Dec 1998
Term ends: Not estimatedThe source records don’t support an estimate.

Classification18 codes

C04B 24/32
Obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds: polyethers, e.g. alkylphenol polyglycolether
C04B 24/16
Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers: sulfur-containing compounds
C04B 24/161
Sulfur-containing compounds: macromolecular compounds comprising sulfonate or sulfate groups
C04B 24/26
Macromolecular compounds: obtained by reactions only involving carbon-to-carbon unsaturated bonds