US4131564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignin-containing dye dispersing composition
Assignee: Westvaco Corp
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Filing: 1978-05-24
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Granted: 1978-12-26
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Expires: 1998-05-24
Abstract
Abstract A dye dispersing composition having improved fiber staining characteristics, lower viscosity and improved heat stability is disclosed which comprises, a mixture of from 97% to 10% by weight of a sulfonated lignin and from 3% to 90% by weight of an aromatic sulfonic acid or a soluble compound obtained by condensing formaldehyde or its equivalent with an aromatic sulfonic acid.
Inventors
- 👤 Peter Dilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:02
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/46; D06P1/48; D06P1/50; C; C09; C09B; C09B67/00; C09B67/0071; C09B67/0084; C09B67/0085; C09B67/0086
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
48 words
A low viscosity, heat stable dye dispersant composition having reduced tendency to stain fibers consisting of, (a) from 97% to 10% by weight of said composition of a sulfonated kraft lignin, and (b) from 3% to 90% by weight of said composition of a formaldehyde condensed naphthalene sulfonate.
Claim 2
Dependent Claim
48 words
A low viscosity, heat stable dye dispersant composition having reduced tendency to stain fibers consisting of, (a) from 97% to 10% by weight of said composition of a sulfonated kraft lignin, and (b) from 3% to 90% by weight of said composition of a formaldehyde condensed naphthalene sulfonate.
Claim 3
Dependent Claim
23 words
The dispersant composition of claim 1 wherein said sulfonated kraft lignin is present in an amount of 80% to 95% of said composition.
References Cited (Backward Citations)
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US3864276A
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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) | 1981-12-25 | 1982-06-26 | 1982-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-25 | 1986-06-26 | 1986-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-25 | 1990-06-26 | 1990-12-26 | $7700.00 | Window Closed / Lapsed |