US4217425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper fiber additive containing polyacrylamide blended with glyoxal and polymeric diallyldimethyl ammonium chloride as a cationic regulator
Assignee: ChampionX LLC
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Filing: 1978-11-06
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Granted: 1980-08-12
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Expires: 1998-11-06
Abstract
Abstract A blend which contains homopolymers useful for imparting wet and dry strength to pulp and paper fibers which comprises a major amount of non-ionic polyacrylamide, together with glyoxal to impart crosslinking and polymeric diallyldimethyl ammonium chloride (DADMAC) as a cationic modifier. A buffer such as tetrasodium pyrophosphate may be used. A dosage of 0.2-5% by weight (preferred 0.5-2% by weight) based on the dry weight of fiber is utilized.
Inventors
- 👤 Edward G. Ballweber
- 👤 Roger H. Jansma
- 👤 Kenneth G. Phillips
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:22
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/38; D21H17/39; D21H17/37; D21H17/41; D21H17/44; D21H17/45; D21H17/455; D21H21/00; D21H21/14; D21H21/18; D21H21/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
69 words
A non-ionic water-soluble acrylamide homopolymer blend with glyoxal and containing polymeric diallyldimethyl ammonium chloride as a cationic regulator wherein the blend is utilized as a paper fiber additive and further wherein said blend is comprised of (1) polyacrylamide 40-95% by weight; (2) polydiallyldimethyl ammonium chloride 4-14% by weight; and (3) glyoxal 2-50% by weight, and which is utilized in a dosage of 0.2-5% based on dry weight of fiber.
Claim 2
Dependent Claim
69 words
A non-ionic water-soluble acrylamide homopolymer blend with glyoxal and containing polymeric diallyldimethyl ammonium chloride as a cationic regulator wherein the blend is utilized as a paper fiber additive and further wherein said blend is comprised of (1) polyacrylamide 40-95% by weight; (2) polydiallyldimethyl ammonium chloride 4-14% by weight; and (3) glyoxal 2-50% by weight, and which is utilized in a dosage of 0.2-5% based on dry weight of fiber.
Claim 3
Dependent Claim
14 words
The blend according to claim 1 which additionally contains tetrasodium pyrophosphate as a buffer.
Claim 4
Dependent Claim
30 words
The blend according to claims 1 or 2 which is utilized as a paper fiber additive in a dosage of 0.2-5% by weight based on the dry weight of fiber.
Claim 5
Dependent Claim
24 words
The composition of claim 1 wherein the polyacrylamide is 64-82%; the polydiallyldimethyl ammonium chloride is 4-14%; and glyoxal is 9-24%, all in weight percent.
Claim 6
Dependent Claim
38 words
A blend composition for imparting wet and dry strength to paper fibers which composition contains about 90 parts by weight of polyacrylamide; 5-20 parts by weight of polydiallyldimethyl ammonium chloride; 10-30 parts glyoxal; and 20 parts tetrasodium pyrophosphate.
Claim 7
Dependent Claim
38 words
A blend composition for imparting wet and dry strength to paper fibers which composition contains about 90 parts by weight of polyacrylamide; 5-20 parts by weight of polydiallyldimethyl ammonium chloride; 10-30 parts glyoxal; and 20 parts tetrasodium pyrophosphate.
References Cited (Backward Citations)
US3556932A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-12 | 1984-02-11 | 1984-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-12 | 1988-02-11 | 1988-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-12 | 1992-02-11 | 1992-08-12 | $7700.00 | Window Closed / Lapsed |