US4990191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aminated sulfonated or sulfomethylated lignins as cement fluid loss control additives
Assignee: Westvaco Corp
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Filing: 1989-02-21
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Granted: 1991-02-05
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Expires: 2009-02-21
Abstract
Abstract A hydraulic cement slurry is disclosed which has low fluid loss properties. In addition to water and hydraulic cement, the hydraulic cement slurry contains a fluid loss control additive comprising a sulfonated or sulfomethylated kraft lignin that has been aminated by reacting it with a polyamine and an aldehyde. The slurry also contains sodium carbonate, sodium phosphate, sodium sulfite, sodium metasilicate or naphthalene sulfonate.
Inventors
- 👤 Peter Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:05
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/487; C04; C04B; C04B24/00; C04B24/16; C04B24/18; C04B28/00; C04B28/02; C04B2103/00; C04B2103/46
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
A hydraulic cement slurry composition which comprises: (a) a hydraulic cement, and the following expressed as parts by weight per 100 parts of said hydraulic cement, (b) water from about 25 to 105 parts, and (c) from about 0.5 to 2.5 parts of a compound selected from the group consisting of a sulfonated lignin and a sulfomethylated lignin, wherein said lignin has been aminated by reacting it with between about 2-5 moles of a polyamine per 1,000 g of said lignin and 2-5 moles of an aldehyde per 1,000 g of said lignin, and (d) 0.1 to 1.5 parts of a compound selected from the group consisting of sodium carbonate, sodium metasilicate, sodium phosphate, sodium sulfite, sodium naphthalene sulfonate and a combination thereof.
Claim 2
Dependent Claim
123 words
A hydraulic cement slurry composition which comprises: (a) a hydraulic cement, and the following expressed as parts by weight per 100 parts of said hydraulic cement, (b) water from about 25 to 105 parts, and (c) from about 0.5 to 2.5 parts of a compound selected from the group consisting of a sulfonated lignin and a sulfomethylated lignin, wherein said lignin has been aminated by reacting it with between about 2-5 moles of a polyamine per 1,000 g of said lignin and 2-5 moles of an aldehyde per 1,000 g of said lignin, and (d) 0.1 to 1.5 parts of a compound selected from the group consisting of sodium carbonate, sodium metasilicate, sodium phosphate, sodium sulfite, sodium naphthalene sulfonate and a combination thereof.
Claim 3
Dependent Claim
13 words
The composition of claim 1, further comprising about 0.05 parts of sodium gluconate.
Claim 4
Dependent Claim
16 words
The composition of claim 1, wherein said polyamine comprises a blend of aminoethylpiperazine and triethylene tetramine.
Claim 5
Dependent Claim
10 words
The composition of claim 1, wherein said aldehyde is formaldehyde.
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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) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |