US4586960A
Expired / Lapsed
US
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Cement admixture
Assignee: Kao Corp
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Filing: 1984-06-26
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Granted: 1986-05-06
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Expires: 2004-06-26
Abstract
Abstract This invention provides a cement admixture comprising a copolymer of an olefin having 2 to 8 carbon atoms with an ethylenically unsaturated dicarboxylic acid anhydride and a cement admixture comprising the copolymer and a water-reducing agent. The cement admixture of this invention can prevent the lowering of the fluidity, or slump loss of a hydraulic cement mix such as concrete, mortar, or paste with the lapse of time and provide improved applicability and workability.
Inventors
- 👤 Masanori Iizuka
- 👤 Hideki Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:27
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/26; C04B24/2664; C04B28/00; C04B28/02
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
86 words
A composition consisting essentially of hydraulic cement mixed with 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of from 500 to 20000, and an aggregate.
Claim 2
Dependent Claim
86 words
A composition consisting essentially of hydraulic cement mixed with 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of from 500 to 20000, and an aggregate.
Claim 3
Dependent Claim
25 words
A composition as claimed in claim 1, in which the molar ratio of said first monomer to said second monomer is from 4/6 to 6/4.
Claim 4
Dependent Claim
20 words
A composition as claimed in claim 2, in which said copolymer consists of a copolymer of maleic anhydride and isobutylene.
Claim 5
Dependent Claim
37 words
A composition as claimed in claim 1 in which said water-insoluble copolymer has recurring units of the formula ##STR2## wherein A is a unit of said second monomer and B is a unit of said first monomer.
Claim 6
Dependent Claim
26 words
A composition as claimed in claim 1, in which said first monomer is selected from the group consisting of maleic anhydride, itaconic anhydride and citraconic anhydride.
Claim 7
Dependent Claim
95 words
A composition consisting essentially of hydraulic cement mixed with (a) 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of 500 to 20000, (b) a water-reducing agent for hydraulic cement compositions and (c) an aggregate.
Claim 8
Dependent Claim
95 words
A composition consisting essentially of hydraulic cement mixed with (a) 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of 500 to 20000, (b) a water-reducing agent for hydraulic cement compositions and (c) an aggregate.
Claim 9
Dependent Claim
25 words
A composition as claimed in claim 6, in which the molar ratio of said first monomer to said second monomer is from 4/6 to 6/4.
Claim 10
Dependent Claim
20 words
A composition as claimed in claim 7, in which said copolymer consists of a copolymer of maleic anhydride and isobutylene.
Claim 11
Dependent Claim
40 words
A composition as defined in claim 6, wherein said water-reducing agent comprises at least one member selected from the group consisting of a naphthalenesulfonic acid/formaldehyde polycondensate water-reducing agent, a sulfonated melamine resin water-reducing agent, and a lignosulfonic acid water-reducing agent.
Claim 12
Dependent Claim
34 words
A cement admixture as defined in claim 6, wherein the water-reducing agent is a water-soluble salt of a copolymer of an olefin having 2 to 8 carbon atoms with an ethylenically unsaturated dicarboxylic acid.
Claim 13
Dependent Claim
19 words
A cement admixture as defined in claim 6, wherein the weight ratio of the copolymer to the water-reducing agent
Claim 14
Dependent Claim
37 words
A composition as claimed in claim 6, in which said water-insoluble copolymer has recurring units of the formula ##STR3## wherein A is a unit of said second monomer and B is a unit of said first monomer.
Claim 15
Dependent Claim
26 words
A composition as claimed in claim 6, in which said first monomer is selected from the group consisting of maleic anhydride, itaconic anhydride and citraconic anhydride.
Claim 16
Dependent Claim
93 words
A process for preparing a hydraulic cement composition having improved workability and stable fluidity, which comprises: mixing with hydraulic cement, 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of 500 to 20000.
Claim 17
Dependent Claim
93 words
A process for preparing a hydraulic cement composition having improved workability and stable fluidity, which comprises: mixing with hydraulic cement, 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of 500 to 20000.
Claim 18
Dependent Claim
25 words
A process as claimed in claim 14, in which the molar ratio of said first monomer to said second monomer is from 4/6 to 6/4.
Claim 19
Dependent Claim
20 words
A process as claimed in claim 15, in which said copolymer consists of a copolymer of maleic anhydride and isobutylene.
Claim 20
Dependent Claim
37 words
A process as claimed in claim 14, in which said water-insoluble copolymer has recurring units of the formula ##STR4## wherein A is a unit of said second monomer and B is a unit of said first monomer.
Claim 21
Dependent Claim
26 words
A process as claimed in claim 14, in which said first monomer is selected from the group consisting of maleic anhydride, itaconic anhydride and citraconic anhydride.
Claim 22
Dependent Claim
111 words
A process for preparing a hydraulic cement composition that requires a reduced amount of water and has improved workability and stable fluidity, which comprises: mixing with hydraulic cement, (a) 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of 500 to 20000, and (b) a water-reducing agent for hydraulic cement composition.
Claim 23
Dependent Claim
111 words
A process for preparing a hydraulic cement composition that requires a reduced amount of water and has improved workability and stable fluidity, which comprises: mixing with hydraulic cement, (a) 0.03 to 2% by weight of said cement of particles of a water-insoluble copolymer obtained by copolymerizing a first, ethylenically unsaturated, dicarboxylic acid anhydride monomer, with a second monomer selected from the group consisting of ethylene, propylene, n-butene, isobutylene, n-pentene, cyclopentene and 2-methyl-1-butene, said water-insoluble copolymer having a particle size in the range of from 0.1 to 1000 micrometers, said water-insoluble copolymer having a molecular weight in the range of 500 to 20000, and (b) a water-reducing agent for hydraulic cement composition.
Claim 24
Dependent Claim
25 words
A composition as claimed in claim 19, in which the molar ratio of said first monomer to said second monomer is from 4/6 to 6/4.
Claim 25
Dependent Claim
20 words
A composition as claimed in claim 20, in which said copolymer consists of a copolymer of maleic anhydride and isobutylene.
Claim 26
Dependent Claim
37 words
A composition as claimed in claim 19, in which said water-insoluble copolymer has recurring units of the formula ##STR5## wherein A is a unit of said second monomer and B is a unit of said first monomer.
Claim 27
Dependent Claim
26 words
A composition as claimed in claim 19, in which said first monomer is selected from the group consisting of maleic anhydride, itaconic anhydride and citraconic anhydride.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-05 | 1989-11-04 | 1990-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-05 | 1993-11-04 | 1994-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-05 | 1997-11-04 | 1998-05-06 | $7700.00 | Window Closed / Lapsed |