US4007004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dyestuff filler derived from kraft black liquor
Assignee: Westvaco Corp
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Filing: 1974-07-05
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Granted: 1977-02-08
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Expires: 1994-07-05
Abstract
Abstract A dyestuff filler material with humectant properties derived from kraft black liquor is disclosed. The process for obtaining the dyestuff filler material involves the acidification of kraft black liquor followed by separation of the precipitated portion, such as by filtration. The filtrate from this separation is then treated to solubilize the remaining portion of lignin, which primarily is low molecular weight lignin. This step is followed by a stabilization step, for example, with air to oxidize the filler material to minimize azo dye reduction.
Inventors
- 👤 Carl W. Bailey, III
- 👤 Peter Dilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:24
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0071; Y; Y10; Y10S; Y10S516/00; Y10S516/01; Y10S516/03
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A material made from the process comprising; a. acidifying kraft black liquor to pH between 9 and 10 to form a precipitate and a filtrate, b. separating said filtrate from said precipitate, c. treating said filtrate with a lignin solubilizing agent to solubilize the remaining lignin, d. stabilizing said filtrate with a member selected from the group consisting of oxidizing agents and blocking agents, and e. evaporating water to obtain a filtrate having a solids content of 40 to 65%.
Claim 2
Dependent Claim
80 words
A material made from the process comprising; a. acidifying kraft black liquor to pH between 9 and 10 to form a precipitate and a filtrate, b. separating said filtrate from said precipitate, c. treating said filtrate with a lignin solubilizing agent to solubilize the remaining lignin, d. stabilizing said filtrate with a member selected from the group consisting of oxidizing agents and blocking agents, and e. evaporating water to obtain a filtrate having a solids content of 40 to 65%.
Claim 3
Dependent Claim
35 words
The filler material of claim 1 wherein in step (c) the filtrate is treated with a lignin solubilizing agent selected from the group consisting of chlorohydroxy propyl sulfonic acid, chloromethane sulfonic acid, and sulfonating agents.
Claim 4
Dependent Claim
28 words
The filler material of claim 1 wherein the process further comprises, acidifying said kraft black liquor with sulfur dioxide, and treating in step (c) said filtrate with formaldehyde.
Claim 5
Dependent Claim
58 words
The filler material of claim 2 wherein in step (c) the filtrate is treated with a sulfonating agent selected from the group consisting of sodium sulfite and sodium bisulfite, and formaldehyde in an amount of 5 to 100 grams per 1,000 grams of filtrate solids at a temperature between 60° and 200° C. for 0.5 to 6 hours.
Claim 6
Dependent Claim
32 words
The filler material of claim 1 wherein in step (d) the process further comprises stabilizing with a member selected from the group consisting of oxygen, air, hydrogen peroxide, epichlorohydrin and cyanuric chloride.
Claim 7
Dependent Claim
31 words
The filler material of claim 1 wherein in step (d) said stabilizing is accomplished by oxidizing with air at a temperature between 50° and 100° C. for 1 to 48 hours.
Claim 8
Dependent Claim
26 words
The filler material of claim 1 wherein the process further comprises, washing the precipitated lignin and combining the washed filtrate with the filtrate of step (b).
Claim 9
Dependent Claim
16 words
The filler material of claim 1 wherein the process further comprises, solubilizing lignin and stabilizing simultaneously.
Claim 10
Dependent Claim
18 words
A dyestuff composition comprising, a water-dispersible solid dyestuff, a dyestuff dispersant, and the filler material of claim 1.
References Cited (Backward Citations)
US2729534A
Cited
US3156520A
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US3726850A
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US3763139A
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US3769272A
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US3864276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-08 | 1980-08-09 | 1981-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-08 | 1984-08-09 | 1985-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-08 | 1988-08-09 | 1989-02-08 | $7700.00 | Window Closed / Lapsed |