Patent US3544138A successfully refreshed from Google Patents.
Patent US4775744A successfully refreshed from Google Patents.
US4775744A
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Cationic and anionic lignin amines
Assignee: Westvaco Corp
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Filing: 1987-07-23
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Granted: 1988-10-04
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Expires: 2007-07-23
Abstract
Abstract Lignin amines are disclosed which are characterized by high nitrogen content and are water soluble at both alkaline and acidic pH values. The lignin amines have utility as flocculants, filtration aids, precipitants, scale inhibitors, asphalt emulsifiers, fluid loss additives, oil well cement additives, corrosion inhibitors, retention aids, cationic dispersants, and tall oil pitch emulsifiers.
Inventors
- 👤 Peter Schilling
- 👤 Patti E. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 05:00
CPC Classifications
C; C08; C08H; C08H6/00; C02; C02F; C02F1/00; C02F1/52; C02F1/5263; C02F1/54; C02F11/00; C02F11/12; C02F11/14; C02F11/147; C02F5/00; C02F5/08; C02F5/10; C02F5/12; C04; C04B; C04B24/00; C04B24/12; C04B24/121; C04B24/24; C09; C09K; C09K8/00; C09K8/42; C09K8/46; C09K8/467; C09K8/487; C09K8/52; C09K8/528; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C23; C23F; C23F11/00; C23F11/08; C23F11/10; C23F11/14; D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/23; C04B2103/00; C04B2103/46; D21H17/03; D21H17/05; D21H17/17; D21H17/63; D21H17/66
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
35 words
An improved lignin derivative consisting essentially of the reaction product of lignin with an aldehyde, or an aldehyde-producing substance, and a polyamine wherein said lignin derivative is water soluble at alkaline and acidic pH values.
Claim 2
Dependent Claim
35 words
An improved lignin derivative consisting essentially of the reaction product of lignin with an aldehyde, or an aldehyde-producing substance, and a polyamine wherein said lignin derivative is water soluble at alkaline and acidic pH values.
Claim 3
Dependent Claim
36 words
The improved lignin derivative of claim 1 wherein the starting lignin material is selected from the group consisting of lignin substantially free from sulfonic acid groups and lignin containing a significant amount of sulfonic acid groups.
Claim 4
Dependent Claim
41 words
The improved lignin derivative of claim 2 wherein the lignin substantially free from sulfonic acid groups is selected from the group consisting of kraft lignin, the low molecular weight lignin by-product of vanillin production, and desulfonated sulfite pulping process lignosulfonic acids.
Claim 5
Dependent Claim
27 words
The improved lignin derivative of claim 2 wherein the lignin containing a significant amount of sulfonic acid groups is selected from the group consisting of lignosulfonic acids.
Claim 6
Dependent Claim
30 words
The improved lignin derivative of claim 4 wherein the lignosulfonic acids are selected from the group consisting of lignosulfonic acids isolated from spent sulfite pulping liquors and sulfonated kraft lignin.
Claim 7
Dependent Claim
18 words
The improved lignin derivative of claim 5 wherein the sulfonated kraft lignin is prepared by high temperature sulfonation.
Claim 8
Dependent Claim
20 words
The improved lignin derivative of claim 5 wherein the sulfonated kraft lignin is prepared by oxidative sulfonation at ambient temperature.
Claim 9
Dependent Claim
16 words
The improved lignin derivative of claim 5 wherein the sulfonated kraft lignin is prepared by sulfomethylation.
Claim 10
Dependent Claim
24 words
The improved lignin derivative of claim 3 wherein the lignin is kraft lignin selected from the group consisting of hardwood lignin and softwood lignin.
Claim 11
Dependent Claim
15 words
The improved lignin derivative of claim 9 wherein the kraft lignin is pretreated by demethylation.
Claim 12
Dependent Claim
23 words
The improved lignin derivative of claim 1 wherein said lignin derivative is an ion selected from the group consisting of cation and anion.
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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) | 1991-10-04 | 1992-04-04 | 1992-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-04 | 1996-04-04 | 1996-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-04 | 2000-04-04 | 2000-10-04 | $7700.00 | Window Closed / Lapsed |