US4100155A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of condensing and/or polymerizing sulfonated lignin containing materials
Assignee: GA Serlachius Oy
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Filing: 1977-01-05
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Granted: 1978-07-11
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Expires: 1997-01-05
Abstract
Abstract A method for polymerizing sulfonated lignin containing materials by adjusting the pH of the materials to a pH below 7, adjusting the moisture content of the materials to a value sufficient to allow the conversion to proceed, but less than 15 percent, and then subjecting the thus treated materials to heating at a temperature from 80° to 225° C in a manner to maintain the moisture content of the material at a value sufficient to allow the conversion to proceed, but less than 15 percent, and for a time period sufficient to form products having a viscosity of at least 25 percent higher than the viscosity of the starting material. The products obtained are useful as dispersants and extenders.
Inventors
- 👤 Theodore Heinrich Gustave Ashorn
- 👤 Paul Elis Laine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:18
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
134 words
Method for converting sulfonated lignin containing materials to substantially water soluble products comprising (a) adjusting the pH of the material such that a 3 percent aqueous solution of the material has a pH below 7; (b) adjusting the moisture content of the pH adjusted material to a value from 1 to 15 percent; and (c) subjecting the material from step (b) to heating at a temperature range from 80° to 225° C in a manner to maintain the moisture content of the material at a value sufficient to allow the conversion to proceed, but less than 15 percent, and for a time period sufficient to form products having viscosity at least 25 percent higher than the viscosity of the starting material, said viscosities being measured in a 50 percent aqueous solution at room temperature.
Claim 2
Dependent Claim
134 words
Method for converting sulfonated lignin containing materials to substantially water soluble products comprising (a) adjusting the pH of the material such that a 3 percent aqueous solution of the material has a pH below 7; (b) adjusting the moisture content of the pH adjusted material to a value from 1 to 15 percent; and (c) subjecting the material from step (b) to heating at a temperature range from 80° to 225° C in a manner to maintain the moisture content of the material at a value sufficient to allow the conversion to proceed, but less than 15 percent, and for a time period sufficient to form products having viscosity at least 25 percent higher than the viscosity of the starting material, said viscosities being measured in a 50 percent aqueous solution at room temperature.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the material is adjusted to a moisture content between 1 to 7 percent.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the pH is adjusted to not less than 1.
Claim 5
Dependent Claim
14 words
The method of claim 3 wherein the pH is adjusted between 2 and 4.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the heating temperature is between 120° C to 150° C.
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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |