US4355996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azo dye reduction improvement of lignin
Assignee: Westvaco Corp
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Filing: 1981-03-04
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Granted: 1982-10-26
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Expires: 2001-03-04
Abstract
Abstract Improved sulfonated lignin surfactants are provided for use as dispersants in dyestuffs. The process for providing the improved surfactants relates to using metals and borate salts to react with the azo dye reducing dihydroxy functions of the lignin molecule through chelation and ester formation mechanisms thereby inhibiting the lignin's azo dye reducing characteristics.
Inventors
- 👤 Peter Dilling
- 👤 Gerald Prazak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:14
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
In a process for making a dyestuff composition with improved fiber staining including the combining of a disperse or vat dye cake and a sulfonated lignin dispersant, the improvement comprising first modifying the sulfonated lignin dispersant by reacting an aqueous solution of a sulfonated lignin at a solids concentration of from 5% to 35% with from 0.01 to 0.5 mole, per 1,000 grams of lignin, of a compound selected from the group consisting of water soluble salts of the divalent metals Mg 2+ , Ca 2+ , Zn 2+ , Cd 2+ , Sr 2+ , Ba 2+ , Ni 2+ , Cr 2+ and Mn 2+ and water soluble borate salts.
Claim 2
Dependent Claim
112 words
In a process for making a dyestuff composition with improved fiber staining including the combining of a disperse or vat dye cake and a sulfonated lignin dispersant, the improvement comprising first modifying the sulfonated lignin dispersant by reacting an aqueous solution of a sulfonated lignin at a solids concentration of from 5% to 35% with from 0.01 to 0.5 mole, per 1,000 grams of lignin, of a compound selected from the group consisting of water soluble salts of the divalent metals Mg 2+ , Ca 2+ , Zn 2+ , Cd 2+ , Sr 2+ , Ba 2+ , Ni 2+ , Cr 2+ and Mn 2+ and water soluble borate salts.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the sulfonated lignin is sulfonated alkali lignin.
Claim 4
Dependent Claim
13 words
The process of claim 1 wherein the sulfonated lignin is sulfite liquor lignin.
Claim 5
Dependent Claim
21 words
The process of claim 1, 2, or 3 wherein the lignin modifying reaction is conducted at room temperature and atmospheric pressure.
Claim 6
Dependent Claim
30 words
The process of claim 1, 2 or 3 wherein the borate salts are selected from the group consisting of any of the soluble metal borates, metal perborates and boric acid.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the boric acid is selected from the group consisting of meta-boric acid, ortho-boric acid and tetra-boric acid.
Claim 8
Dependent Claim
13 words
The process of claim 5 wherein the metal borate is sodium tetraborate decahydrate.
Claim 9
Dependent Claim
12 words
The process of claim 5 wherein the metal perborate is sodium perborate.
Claim 10
Dependent Claim
41 words
The process of claim 1 wherein the sulfonated lignin solution is reacted with a compound selected from the group consisting of calcium chloride, magnesium sulfate, manganese (II) sulfate monohydrate, strontium (II) nitrate, zinc sulfate, barium chloride dihydrate and chromium (II) chloride.
Claim 11
Dependent Claim
8 words
The product of the process of claim 1.
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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) | 1985-10-25 | 1986-04-26 | 1986-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-25 | 1990-04-26 | 1990-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-25 | 1994-04-26 | 1994-10-26 | $7700.00 | Window Closed / Lapsed |