US4455257A
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Cationic reaction product of kraft lignin with aldehyde and polyamine
Assignee: Reed Lignin Inc
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Filing: 1982-10-12
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Granted: 1984-06-19
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Expires: 2002-10-12
Abstract
Abstract Cationic reaction products having improved flocculating performance for suspended solids are obtained by the reaction of kraft lignin with aldehydes and polyamines.
Inventors
- 👤 Henry W. Hoftiezer
- 👤 Daniel J. Watts
- 👤 Akio Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:52
CPC Classifications
C; C08; C08H; C08H6/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
30 words
Cationic lignin derivative consisting essentially of the reaction product of kraft lignin which is substantially free from sulfonic acid groups with an aldehyde or an aldehyde-producing substance, and a polyamine.
Claim 2
Dependent Claim
30 words
Cationic lignin derivative consisting essentially of the reaction product of kraft lignin which is substantially free from sulfonic acid groups with an aldehyde or an aldehyde-producing substance, and a polyamine.
Claim 3
Dependent Claim
27 words
Cationic lignin derivative as in claim 1 wherein said polyamine contains at least two amino groups, at least one of which is primary or secondary amino group.
Claim 4
Dependent Claim
12 words
Cationic lignin derivative as in claim 1 wherein said polyamine is polyalkyleneamine.
Claim 5
Dependent Claim
14 words
Cationic lignin derivative as in claim 1 wherein said polyamine is a cyclic polyamine.
Claim 6
Dependent Claim
39 words
Cationic lignin derivative as in claim 3 wherein said polyalkyleneamine is selected from the group consisting of ethylenediamine and linear and branched homologues of ethylenediamine, wherein said homologues contain at least one additional CH 2 CH 2 N moiety.
Claim 7
Dependent Claim
12 words
Cationic lignin derivative as in claim 1, wherein said aldehyde is formaldehyde.
Claim 8
Dependent Claim
12 words
Cationic lignin derivative as in claim 2 wherein said aldehyde is formaldehyde.
Claim 9
Dependent Claim
12 words
Cationic lignin derivative as in claim 3 wherein said aldehyde is formaldehyde.
Claim 10
Dependent Claim
12 words
Cationic lignin derivative as in claim 4 wherein said aldehyde is formaldehyde.
Claim 11
Dependent Claim
12 words
Cationic lignin derivative as in claim 5 wherein said aldehyde is formaldehyde.
Claim 12
Dependent Claim
33 words
Cationic lignin derivative as in claims 1, 2, 3, 4, 5, 6, 7, 8, 9 or 10 wherein the ratio to said lignin to said polyamine is from about 1:2 to about 1:0.1.
Claim 13
Dependent Claim
31 words
A process for making a cationic lignin derivative which comprises reaction kraft lignin which is substantially free from sulfonic acid groups with an aldehyde or an aldehyde-producing substance, and a polyamine.
Claim 14
Dependent Claim
31 words
A process for making a cationic lignin derivative which comprises reaction kraft lignin which is substantially free from sulfonic acid groups with an aldehyde or an aldehyde-producing substance, and a polyamine.
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) | 1987-06-19 | 1987-12-19 | 1988-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-19 | 1991-12-19 | 1992-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-19 | 1995-12-19 | 1996-06-19 | $7700.00 | Window Closed / Lapsed |