US4126480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous suspensions
Assignee: Dow Chemical Co
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Filing: 1978-02-27
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Granted: 1978-11-21
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Expires: 1998-02-27
Abstract
Abstract Water-soluble copolymers prepared from styrene and maleic anhydride and the water-soluble salts and partial esters thereof function synergistically with inorganic salts to obtain superior reduction of water demand of dispersed inorganic solids. The disclosed invention is particularly adapted for use in the wet-grinding process for preparing portland cement.
Inventors
- 👤 Dalton C. MacWilliams
- 👤 James R. Wirt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:20
CPC Classifications
C; C04; C04B; C04B7/00; C04B7/36; C04B7/38; C04B7/42
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
149 words
In the wet process for the production of cement solids wherein limestone and clay are ground in the presence of water to form a pumpable kiln feed slurry, the improvement which comprises adding to said slurry an amount of a water-demand reducing system sufficient to synergistically reduce the water demand of said slurry, said system comprising (1) a water soluble salt of a styrene-maleic anhydride copolymer having a molecular weight of from about 1000 to about 5000 and being characterized by a ratio of from about 50 to about 67 mole percent of styrene and from about 50 to about 33 mole percent of maleic anhydride and (2) a compound selected from the group consisting of alkali metal carbonates, bicarbonates, oxalates, silicates, aluminates and borates and ammonium carbonates, bicarbonates, oxalates and borates, (1) and (2) being employed in a ratio of from about 1:1 to about 1:10 by weight.
Claim 2
Dependent Claim
149 words
In the wet process for the production of cement solids wherein limestone and clay are ground in the presence of water to form a pumpable kiln feed slurry, the improvement which comprises adding to said slurry an amount of a water-demand reducing system sufficient to synergistically reduce the water demand of said slurry, said system comprising (1) a water soluble salt of a styrene-maleic anhydride copolymer having a molecular weight of from about 1000 to about 5000 and being characterized by a ratio of from about 50 to about 67 mole percent of styrene and from about 50 to about 33 mole percent of maleic anhydride and (2) a compound selected from the group consisting of alkali metal carbonates, bicarbonates, oxalates, silicates, aluminates and borates and ammonium carbonates, bicarbonates, oxalates and borates, (1) and (2) being employed in a ratio of from about 1:1 to about 1:10 by weight.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein the copolymer has a molecular weight of from about 1200 to about 3200 with a mole ratio of styrene to maleic anhydride of 1:1.
Claim 4
Dependent Claim
26 words
The process of claim 1 wherein the compound is selected from the group consisting of alkali metal carbonate, bicarbonate and silicate and ammonium carbonate and bicarbonate.
Claim 5
Dependent Claim
26 words
The process of claim 2 wherein the compound is selected from the group consisting of alkali metal carbonate, bicarbonate and silicate and ammonium carbonate and bicarbonate.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein the compound is an alkali metal or ammonium carbonate.
Claim 7
Dependent Claim
15 words
The process of claim 2 wherein the compound is an alkali metal or ammonium carbonate.
Claim 8
Dependent Claim
13 words
The process of claim 1 wherein the compound is an alkali metal silicate.
Claim 9
Dependent Claim
13 words
The process of claim 2 wherein the compound is an alkali metal silicate.
Claim 10
Dependent Claim
21 words
The process of claim 1 wherein the copolymer and compound are employed in a ratio of from 1:1 to about 1:6.
Claim 11
Dependent Claim
21 words
The process of claim 1 wherein the copolymer and compound are employed in a ratio of from 1:1 to about 1:4.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein the copolymer and compound are employed in a ratio of 1:3.
Claim 13
Dependent Claim
21 words
The process of claim 2 wherein the copolymer and compound are employed in a ratio of from 1:1 to about 1:10.
Claim 14
Dependent Claim
124 words
A pumpable kiln feed slurry useful in a wet process portland cement, said slurry containing sufficient amounts of a water-demand reducing system to synergistically reduce the water demand thereof, said system comprising (1) a water-soluble salt of a styrene-maleic anhydride copolymer having a molecular weight of from about 1000 to about 5000 and being characterized by a ratio of from about 50 to about 67 mole percent of styrene and from about 50 to about 33 mole percent of maleic anhydride and (2) a compound selected from the group consisting of alkali metal carbonates, bicarbonates, oxalates, borates, aluminates, and silicates and ammonium carbonates, bicarbonates, oxalates and borates, (1) and (2) being employed in a ratio of from about 1:1 to about 1:10 by weight.
Claim 15
Dependent Claim
124 words
A pumpable kiln feed slurry useful in a wet process portland cement, said slurry containing sufficient amounts of a water-demand reducing system to synergistically reduce the water demand thereof, said system comprising (1) a water-soluble salt of a styrene-maleic anhydride copolymer having a molecular weight of from about 1000 to about 5000 and being characterized by a ratio of from about 50 to about 67 mole percent of styrene and from about 50 to about 33 mole percent of maleic anhydride and (2) a compound selected from the group consisting of alkali metal carbonates, bicarbonates, oxalates, borates, aluminates, and silicates and ammonium carbonates, bicarbonates, oxalates and borates, (1) and (2) being employed in a ratio of from about 1:1 to about 1:10 by weight.
Claim 16
Dependent Claim
26 words
The slurry of claim 13 wherein the compound is selected from the group consisting of alkali metal carbonate, bicarbonate and silicate and ammonium carbonate and bicarbonate.
Claim 17
Dependent Claim
15 words
The slurry of claim 14 wherein the compound is an alkali metal or ammonium carbonate.
Claim 18
Dependent Claim
13 words
The slurry of claim 14 wherein the compound is an alkali metal silicate.
Claim 19
Dependent Claim
21 words
The slurry of claim 13 wherein the copolymer and compound are employed in a ratio of from 1:1 to about 1:10.
Claim 20
Dependent Claim
21 words
The slurry of claim 13 wherein the copolymer and compound are employed in a ratio of from 1:1 to about 1:6.
Claim 21
Dependent Claim
21 words
The slurry of claim 13 wherein the copolymer and compound are employed in a ratio of from 1:1 to about 1:4.
Claim 22
Dependent Claim
17 words
The slurry of claim 13 wherein the copolymer and compound are employed in a ratio of 1:3.
Claim 23
Dependent Claim
17 words
The slurry of claim 15 wherein the copolymer and compound are employed in a ratio of 1:3.
Claim 24
Dependent Claim
17 words
The slurry of claim 16 wherein the copolymer and compound are employed in a ratio of 1:3.
Claim 25
Dependent Claim
97 words
An aqueous concentrate water-demand reducing system comprising a water soluble salt of a styrene-maleic anhydride copolymer having a molecular weight of from about 1000 to about 5000 and being characterized by a ratio of from about 50 to about 67 mole percent of styrene and from about 50 to about 33 mole percent of maleic anhydride and a compound selected from the group consisting of alkali metal bicarbonates, carbonates, oxalates, borates, aluminates and silicates and ammonium carbonates, bicarbonates, oxalates and borates in a ratio of copolymer to inorganic compound of from 1:1 to about 1:10 by weight.
Claim 26
Dependent Claim
97 words
An aqueous concentrate water-demand reducing system comprising a water soluble salt of a styrene-maleic anhydride copolymer having a molecular weight of from about 1000 to about 5000 and being characterized by a ratio of from about 50 to about 67 mole percent of styrene and from about 50 to about 33 mole percent of maleic anhydride and a compound selected from the group consisting of alkali metal bicarbonates, carbonates, oxalates, borates, aluminates and silicates and ammonium carbonates, bicarbonates, oxalates and borates in a ratio of copolymer to inorganic compound of from 1:1 to about 1:10 by weight.
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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |