US3956261A
Expired / Lapsed
US
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Lignin adducts
Assignee: Westvaco Corp
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Filing: 1975-10-10
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Granted: 1976-05-11
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Expires: 1995-10-10
Abstract
Abstract Disclosed herein are lignin adducts of the formula WHEREIN X is an alkali metal cation, such as sodium, potassium and lithium. These lignin adducts are made by reacting an alkali lignin or sulfonated lignin with up to 10 moles of a salt of epoxysuccinate at a temperature of from 50 DEG C. to 150 DEG C. The lignodicarboxylic acid and its salts are useful as a dispersant and metal complexing agent.
Inventors
- 👤 Stephen Y. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:34
CPC Classifications
C; C08; C08H; C08H6/00; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
30 words
Lignin dicarboxylate comprising, the reaction product of lignin and from an effective amount up to about 10 moles of an alkali metal salt of epoxy-succinate per 1,000 grams of lignin.
Claim 2
Dependent Claim
30 words
Lignin dicarboxylate comprising, the reaction product of lignin and from an effective amount up to about 10 moles of an alkali metal salt of epoxy-succinate per 1,000 grams of lignin.
Claim 3
Dependent Claim
12 words
The product of claim 1 wherein said lignin is a sulfonated lignin.
Claim 4
Dependent Claim
12 words
The product of claim 1 wherein said lignin is an alkali lignin.
Claim 5
Dependent Claim
18 words
The product of claim 3 wherein the lignin is reacted with from 2 to 5 moles of epoxysuccinate.
Claim 6
Dependent Claim
12 words
The product of claim 1 wherein said alkali metal salt is sodium.
Claim 7
Dependent Claim
9 words
The product of claim 1 in its free-acid form.
References Cited (Backward Citations)
US2758990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |