US4421602A
Expired / Lapsed
US
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Linear basic polymers, their preparation and their use
Assignee: BASF SE
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Filing: 1982-07-12
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Granted: 1983-12-20
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Expires: 2002-07-12
Abstract
Abstract Linear basic polymers containing, as characteristic components, from 90 to 10 mole % of copolymerized units of the formula ##STR1## and from 10 to 90 mole % of copolymerized units of the formula ##STR2## are obtained by polymerizing the compound of the formula CH 2 ═CH--NH--CHO (N-vinylformamide) to a polyvinylformamide in the presence of a free radical polymerization initiator and splitting off the formyl group from the resulting polymer at from 20° to 200° in the presence of an acid or base. The reaction products are used as retention agents, drainage assistants and flocculants in papermaking.
Inventors
- 👤 Fritz Brunnmueller
- 👤 Rolf Schneider
- 👤 Michael Kroener
- 👤 Hans Mueller
- 👤 Friedrich Linhart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:25
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/44; D21H17/45; D21H17/455; C; C08; C08F; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A linear basic polymer containing from 90 to 10 mole % of units of the formula ##STR9## and from 10 to 90 mole % of units of the formula ##STR10## and having a Fikentscher K value of from 10 to 200 (measured in 0.5% strength aqueous sodium chloride solution at 25° C.).
Claim 2
Dependent Claim
52 words
A linear basic polymer containing from 90 to 10 mole % of units of the formula ##STR9## and from 10 to 90 mole % of units of the formula ##STR10## and having a Fikentscher K value of from 10 to 200 (measured in 0.5% strength aqueous sodium chloride solution at 25° C.).
Claim 3
Dependent Claim
74 words
A process for the preparation of a linear basic polymer as claimed in claim 1, wherein the compound of the formula CH 2 ═CH--NH--CHO (N-vinylformamide) is polymerized to a polyvinylformamide in the presence of a free radical polymerization initiator, and the resulting polymer is solvolyzed at from 20° to 200° C. in the presence of an acid or base, from 10 to 90% of the formyl groups being split off from the N-vinylformamide homopolymer.
Claim 4
Dependent Claim
33 words
A process as claimed in claim 2, wherein vinylformamide is polymerized in aqueous solution using a polymerization initiator based on a water-soluble azo compound, and the polymer thus prepared is solvolyzed in water.
Claim 5
Dependent Claim
33 words
A process as claimed in claim 2, wherein from 0.05 to 1.5 equivalents of a mineral acid or of a base are used per formyl group equivalent of the polyvinylformamide obtained during polymerization.
Claim 6
Dependent Claim
25 words
A process as claimed in claim 2, wherein from 0.4 to 1 equivalent of a base is used per formyl group equivalent of the polyvinylformamide.
Claim 7
Dependent Claim
40 words
In a papermaking process comprising the deposition of a pulp stock to form a non-woven sheet, the improvement comprising: adding to the pulp stock a linear basic polymer as claimed in claim 1, to increase retention, drainage rate and flocculation.
Claim 8
Dependent Claim
77 words
In a process for papermaking, the improvement comprising adding from 0.005 to 0.5% by weight, based on the dry fiber, of a linear basic polymer containing 90 to 10 mole % of units of the formula ##STR11## and from 10 to 90 mole % of units of the formula ##STR12## and having a Fikentscher K value of from 10 to 200 (measured in 0.5% strength aqueous sodium chloride solution at 25° C.) to stock before sheet formation.
Claim 9
Dependent Claim
77 words
In a process for papermaking, the improvement comprising adding from 0.005 to 0.5% by weight, based on the dry fiber, of a linear basic polymer containing 90 to 10 mole % of units of the formula ##STR11## and from 10 to 90 mole % of units of the formula ##STR12## and having a Fikentscher K value of from 10 to 200 (measured in 0.5% strength aqueous sodium chloride solution at 25° C.) to stock before sheet formation.
Claim 10
Dependent Claim
31 words
The linear basic polymer of claim 1 containing 90 to 10 mole % of units of the formula ##STR13## and 20 to 80 mole % of units of the formula ##STR14##
References Cited (Backward Citations)
DE1817309U
Cited
DE1495692A1
Cited
US3597314A
Cited
US3609132A
Cited
US3702800A
Cited
US4070530A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |