US3864290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cement set accelerator
Assignee: Sandoz AG
•
Filing: 1973-03-23
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Granted: 1975-02-04
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Expires: 1993-03-23
Abstract
Abstract The rate of hardening of a portland cement mix is accelerated by the addition of a low molecular weight, water-soluble hydroxylated adduct formed by reacting melamine and an aldehyde. The adduct is employed in an amount within the range of from about 0.01% to about 1.00%, preferably from about 0.2% to about 0.8% by weight of cement. The water content of the cement mix for a given consistency tends to be lowered by the incorporation of the adduct, providing an additional advantage from the practice of the invention. The adduct may be employed as a concentrated solution in water and may be used in combination with known set accelerating agents and with set retarding agents where reduction in water content is desired without appreciable change in the rate of set of the cement mix.
Inventors
- 👤 Richard B Peppler
- 👤 Philip A Rosskopf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:12
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/24; C04B24/28; C04B24/30; C04B24/305
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
118 words
A HYDRAULIC CEMENT MIX-ADDITIVE COMPRISING A MIXTURE OF (A) A WATER SOLUBLE ADDUCT PRODUCT RESULTING FROM THE CONDENSATION REACTION OF 2,4,6-TRIAMINO-SYN HYDE UNDER ALKALINE CONDITIOS AND (B) AN AGENT ADAPTED TO EFFECT THE RATE OF SETTING OF CONCRETE WHICH AGENT IS A LIGNOSULFONATE OF CALCIUM, SODIUM OR AMMONIUM OR A WATER SOLUBLE FORMATE SALT, WHEREBY UPON INCORPORATING SAID ADDITIVE IN THE HYDRAULIC CEMENT MIX OF PORTLAND CEMENT, AGGREGATE AND SUFFICIENT WATER TO EFFECT HYDRAULIC SETTING OF THE CEMENT, THE RATE OF HARDENING OF SAID CEMENT MIX IS ADVANTAGEOUSLY CONTROLLED WHILE THE AMOUNT OF WATER REQUIRED IN THE MIX FOR A GIVEN CONSISTENCY IS CONSIDERABLY REDUCED AS COMPARED WITH A PLAIN MIX, AND WITHOUT UNDESIRED TOXIC OR CORROSIVE EFFETS.
Claim 2
Dependent Claim
118 words
A HYDRAULIC CEMENT MIX-ADDITIVE COMPRISING A MIXTURE OF (A) A WATER SOLUBLE ADDUCT PRODUCT RESULTING FROM THE CONDENSATION REACTION OF 2,4,6-TRIAMINO-SYN HYDE UNDER ALKALINE CONDITIOS AND (B) AN AGENT ADAPTED TO EFFECT THE RATE OF SETTING OF CONCRETE WHICH AGENT IS A LIGNOSULFONATE OF CALCIUM, SODIUM OR AMMONIUM OR A WATER SOLUBLE FORMATE SALT, WHEREBY UPON INCORPORATING SAID ADDITIVE IN THE HYDRAULIC CEMENT MIX OF PORTLAND CEMENT, AGGREGATE AND SUFFICIENT WATER TO EFFECT HYDRAULIC SETTING OF THE CEMENT, THE RATE OF HARDENING OF SAID CEMENT MIX IS ADVANTAGEOUSLY CONTROLLED WHILE THE AMOUNT OF WATER REQUIRED IN THE MIX FOR A GIVEN CONSISTENCY IS CONSIDERABLY REDUCED AS COMPARED WITH A PLAIN MIX, AND WITHOUT UNDESIRED TOXIC OR CORROSIVE EFFETS.
Claim 3
Dependent Claim
13 words
The cement mix additive of claim 1 in which said aldehyde comprises formaldehyde.
Claim 4
Dependent Claim
52 words
The cement mix additive of claim 1 in which said agent adapted to affect the rate of setting is a lignosulfonate of calcium, sodium or ammonium, whereby the rate of hardening of cement mixes containing said additive is less than that resulting from the use of the adduct alone as an additive.
Claim 5
Dependent Claim
14 words
The cement mix additive of claim 3 in which said agent is calcium lignosulfonate.
Claim 6
Dependent Claim
50 words
The cement mix additive of claim 1 in which said agent adapted to affect the rate of setting is a water soluble formate salt, whereby the rate of hardening of cement mixes containing said additive is advantageously accelerated in excess of the acceleration obtainable by means of the adduct alone.
Claim 7
Dependent Claim
17 words
The cement mix additive of claim 5 in which said water soluble formate salt is sodium formate.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |