US4606770A
Expired / Lapsed
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Additive for hydraulic cement mixes
Assignee: Sandoz AG
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Filing: 1984-11-13
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Granted: 1986-08-19
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Expires: 2004-11-13
Abstract
Abstract A hydraulic cement mix including hydraulic cement, aggregate, sufficient water to affect hydraulic setting of the cement, and an additive comprising an N-methylol amide, specifically, tri- or tetramethylolglycoluril alone or in combination with other accelerators of set. The additive is present in an amount sufficient to decrease the time necessary for the hardening of the concrete mix. Generally, the additive is present in a total amount of up to about 4.0% by weight based upon the weight of cement in the mix, usually in an amount of between about 0.01% and about 2.50% by weight of cement. The latter concentration is present when complex combinations of accelerators of set for hydraulic cement are employed.
Inventors
- 👤 Arthur H. Gerber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:59
CPC Classifications
C; C09; C09K; C09K3/00; C04; C04B; C04B28/00; C04B28/02; C04B24/00; C04B24/12; C04B24/128
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
32 words
A hydraulic cement mix comprising portland cement, aggregate, sufficient water to effect hydraulic setting of the cement and a set accelerating effective amount of an admixture comprising a poly(N-methylol) derivative of glycoluril.
Claim 2
Dependent Claim
32 words
A hydraulic cement mix comprising portland cement, aggregate, sufficient water to effect hydraulic setting of the cement and a set accelerating effective amount of an admixture comprising a poly(N-methylol) derivative of glycoluril.
Claim 3
Dependent Claim
59 words
A hydraulic cement mix of claim 1 comprising portland cement, aggregate, sufficient water to effect hydraulic setting of the cement and a set accelerating effective amount of an admixture comprising a poly(N-methylol) derivative of glycoluril and one or more materials selected from the group consisting of alkanolamines and inorganic salts of nitrates, nitrites, thiocyanates, chlorides and water soluble formates.
Claim 4
Dependent Claim
34 words
The hydraulic cement mix of claim 2 in which said methylol derivative is trimethylolglycoluril present in an amount within the range of from about 0.01 percent to about 0.20 percent by weight of cement.
Claim 5
Dependent Claim
34 words
The hydraulic cement mix of claim 2 in which said methylol derivative is tetramethylolglycoluril present in an amount within the range of from about 0.01 percent to about 0.20 percent by weight of cement.
Claim 6
Dependent Claim
37 words
The hydraulic cement mix of claim 2 in which said admixture further comprises an alkali metal nitrate present in an amount within the range of from about 0.025 percent to about 4.0 percent by weight of cement.
Claim 7
Dependent Claim
38 words
The hydraulic cement mix of claim 2 in which said admixture further comprises an alkaline earth metal nitrate present in an amount within the range of from about 0.025 percent to about 4.0 percent by weight of cement.
Claim 8
Dependent Claim
35 words
The hydraulic cement mix of claim 2 in which said admixture further comprises alkali nitrites present in an amount within the range of from about 0.025 percent to about 4.0 pecent by weight of cement.
Claim 9
Dependent Claim
38 words
The hydraulic cement mix of claim 2 in which said admixture further comprises an alkaline earth metal nitrite present in an amount within the range of from about 0.025 percent to about 4.0 percent by weight of cement.
Claim 10
Dependent Claim
37 words
The hydraulic cement mix of claim 2 in which said admixture further comprises an alkali metal thiocyanate present in an amount within the range of from about 0.025 percent to about 4.0 percent by weight of cement.
Claim 11
Dependent Claim
38 words
The hydraulic cement mix of claim 2 in which said admixture further comprises an alkaline earth metal thiocyanate present in an amount within the range of from about 0.025 percent to about 4.0 percent by weight of cement.
Claim 12
Dependent Claim
30 words
The hydraulic cement mix of claim 2 in which triethanolamine is present in an amount within the range of from about 0.001 percent and 0.05 percent by weight of cement.
Claim 13
Dependent Claim
30 words
The hydraulic cement mix of claim 2 in which diethanolamine is present in an amount within the range of from about 0.001 percent and 0.05 percent by weight of cement.
Claim 14
Dependent Claim
33 words
The hydraulic cement mix of claim 2 in which said admixture further comprises bicine present in an amount within the range of from about 0.001 percent and 0.05 percent by weight of cement.
Claim 15
Dependent Claim
41 words
An admixture composition for accelerating the setting of hydraulic cement compositions comprising a poly(N-methylol) derivative of glycoluril and one or more materials selected from the group consisting of alkanolamines and inorganic salts of nitrates, nitrites, thiocyanates, chlorides and water soluble formates.
Claim 16
Dependent Claim
41 words
An admixture composition for accelerating the setting of hydraulic cement compositions comprising a poly(N-methylol) derivative of glycoluril and one or more materials selected from the group consisting of alkanolamines and inorganic salts of nitrates, nitrites, thiocyanates, chlorides and water soluble formates.
Claim 17
Dependent Claim
11 words
An admixture according to claim 14 wherein said methylol derivative trimethylolglycoluril.
Claim 18
Dependent Claim
10 words
An admixture according to claim 14 wherein said is tetramethylolglycoluril.
Claim 19
Dependent Claim
31 words
An admixture according to claim 14 comprising: (a) trimethyloglycoluril or tetramethylolglycoluril; (b) an alkali or alkaline earth metal nitrate; (c) an alkali or alkaline earth metal thiocyanate; and (d) an alkanolamine.
Claim 20
Dependent Claim
83 words
In the method of setting a hydraulic cement comprising the steps of: (a) bringing together in combination portland cement, aggregate, sufficient water to effect hydraulic setting of the portland cement and an admixture for accelerating the setting; (b) mixing the resulting combination to obtain a uniform, plastic mix; (c) applying the plastic mix to the desired form; and (d) allowing the plastic mix to set; the improvement comprising employing therein as such set accelerating admixture an admixture comprising a poly(N-methylol) derivative of glycoluril.
Claim 21
Dependent Claim
83 words
In the method of setting a hydraulic cement comprising the steps of: (a) bringing together in combination portland cement, aggregate, sufficient water to effect hydraulic setting of the portland cement and an admixture for accelerating the setting; (b) mixing the resulting combination to obtain a uniform, plastic mix; (c) applying the plastic mix to the desired form; and (d) allowing the plastic mix to set; the improvement comprising employing therein as such set accelerating admixture an admixture comprising a poly(N-methylol) derivative of glycoluril.
Claim 22
Dependent Claim
12 words
A method according to claim 18 wherein the methylol derivative is trimethylolglycoluril.
Claim 23
Dependent Claim
12 words
A method according to claim 18 wherein the methylol derivative is tetramethylolglycoluril.
Claim 24
Dependent Claim
34 words
A method according to claim 18 wherein the admixture further comprises one or more materials selected from the group consisting an alkanolamine and inorganic salts of nitrates, nitrites, thiocyanates, chlorides and water soluble formates.
Claim 25
Dependent Claim
20 words
A method according to claim 21 wherein the alkanolamine is selected from the group consisting of: bicine, diethanolamine and triethanolamine.
Claim 26
Dependent Claim
36 words
The hydraulic cement mix of claim 1 in which said methylol derivative is trimethylolglycoluril or tetramethylolglycoluril present in an amount within the range of from about 0.01 percent to about 0.25 percent by weight of cement.
Claim 27
Dependent Claim
35 words
The hydraulic cement mix of claim 1 in which said methylol derivative is tetramethylolglycoluril or present in an amount within the range of from about 0.01 percent to about 0.10 percent by weight of cement.
Claim 28
Dependent Claim
36 words
The hydraulic cement mix of claim 2 in which the admixture comprises: (a) trimethylolglycoluril or tetramethylolglycoluril; (b) an alkali or alkaline earth metal nitrate; (c) an alkali or alkaline earth metal thiocyanate; and (d) an alkanolamine.
Claim 29
Dependent Claim
58 words
The hydraulic cement mix of claim 25 in which the admixture comprises, based on the dry weight of cement: (a) 0.01 to 0.2% by weight of trimethylolglycoluril or tetramethylolglycoluril; (b) 0.025 to 4.0% by weight of sodium or calcium nitrate; (c) 0.025 to 4.0% by weight of sodium thiocyanate; and (d) 0.001 to 0.05% by weight of triethanolamine.
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) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |