Patent US3671428A successfully refreshed from Google Patents.
US3671428A
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Lignin derivative
Assignee: Georgia-Pacific LLC
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Filing: 1970-02-20
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Granted: 1972-06-20
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Expires: 1990-02-20
Abstract
Abstract Lignin derivatives, particularly for use in oil base drilling muds, are obtained by reacting an oxidized lignin with an amine to form a salt and heating the resulting salt to elevated temperatures until a substantial portion of the product is converted to a nitrogen containing product wherein the nitrogen is stable in an aqueous alkaline medium at room temperature.
Inventors
- 👤 Chung Sur Youn Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:27
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/36; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03; Y10S516/04; Y10S516/05; Y10S516/06; Y10S516/07
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
40 words
A composition according to claim 1 wherein said oxidized lignin product contains from 10 to 35 weight percent of carboxyl radicals, expressed as acid radicals, and the resulting reaction product is heated at a temperature of 120* to 200* C.
Claim 2
Dependent Claim
22 words
A composition according to claim 2 wherein the oxidized lignin product is a residual pulping liquor obtained from a kraft pulping process.
Claim 3
Dependent Claim
17 words
A composition according to claim 2 wherein the oxidized lignin product is an oxidized spent sulfite liquor.
Claim 4
Dependent Claim
161 words
An oil base drilling fluid composition which comprises a continuous oil phase fluid containing in effective amounts as an emulsifier a lignin derivative prepared by intermixing polymeric constituents of an oxidized lignin product with a primary or secondary amine having substituents selected from the group consisting of alkyl radicals having from six to 30 carbon atoms and phenyl radicals to form a salt, and heating at a pH of at least 4.5 the resulting salt of the amine and polymeric constituents at a temperature of from 120* C to the thermal decomposition temperature of the reaction product until a substantial portion of the resulting product is converted to a nitrogen-containing product wherein the nitrogen is substantially stable in an aqueous alkaline medium at room temperature, said polymeric constituents being water-soluble constituents having a diffusion coefficient in the range of 8 to 20 mm2/day, and said oxidized lignin product containing at least 8 weight percent of carboxyl radicals, expressed as acid radicals.
Claim 5
Dependent Claim
17 words
A composition according to claim 5 wherein the oxidized lignin product is an oxidized spent sulfite liquor.
Claim 6
Dependent Claim
21 words
A composition according to claim 5 wherein the oxidized lignin product is a residual pulping liquor from the kraft pulping process.
Claim 7
Dependent Claim
19 words
A composition according to claim 6 wherein the amine is an alkylamine having from 10 to 20 carbon atoms.
Claim 8
Dependent Claim
19 words
A composition according to claim 7 wherein the amine is an alkylamine having from 10 to 20 carbon atoms.
Claim 9
Dependent Claim
41 words
A composition according to claim 8 wherein the resulting salt of the polymeric constituents and the amine is heated under drying conditions at a temperature of from 120* to 200* C at a pH in the range of 6 to 9.
Claim 10
Dependent Claim
38 words
A composition according to claim 8 wherein the resulting salt of the polymeric constituents and amine is heated under drying conditions at a temperature in the range of 145* to 185* C for from one-half to 16 hours.
Claim 11
Dependent Claim
41 words
A composition according to claim 9 wherein the resulting salt of the polymeric constituents and the amine is heated under drying conditions at a temperature of from 120* to 200* C at a pH in the range of 6 to 9.
Claim 12
Dependent Claim
46 words
A composition according to claim 9 wherein the resulting salt of the polymeric constituents and the amine is heated under drying conditions in the range of 145* to 185* C for from one-half to 16 hours at a pH in the range of 6 to 9.
Claim 13
Dependent Claim
22 words
In a process of drilling a well the improvement which comprises circulating in the well a drilling fluid composition of claim 4.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |