Patent US4066494A successfully refreshed from Google Patents.
US4066494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nitrogenous condensation products used as retention aids in papermaking
Assignee: BASF SE
•
Filing: 1975-07-10
•
Granted: 1978-01-03
•
Expires: 1995-07-10
Abstract
Abstract Production of water-soluble crosslinked auxiliaries for the papermaking industry by reacting A. one equivalent of NH groups of a polyalkylene polyamine having from 15 to 500 alkyleneimine units with B. from 0.001 to 0.08 mole of a reaction product obtained from a polyalkylene oxide having from 8 to 100 alkylene oxide units with epichlorohydrin, In aqueous solution at a temperature of from 20° to 100° C. The viscosity of an aqueous solution containing 20% by weight of the crosslinked auxiliaries is from 300 to 1,500 centipoises (20° C).
Inventors
- 👤 Emil Scharf
- 👤 Rolf Fikentscher
- 👤 Werner Auhorn
- 👤 Werner Streit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:04
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; C; C02; C02F; C02F1/00; C02F1/52; C02F1/54; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2603; C08G65/2606; C08G65/2609; C08G73/00; C08G73/02; C08G73/0206; C08G73/0213; C08G73/022; D21H17/46; D21H17/54; D21H21/00; D21H21/06; D21H21/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A process for the production of paper which comprises adding as drainage and retention aids to an aqueous suspension of cellulosic fibers for making paper sheet, from about 0.01 to 0.3% by weight, based on the dry weight of cellulosic fiber in the pulp, of a water-soluble crosslinked reaction product obtained by reacting a. one equivalent of NH groups of a polyalkylene polyamine having from 15 to 500 alkyleneimine units wherein said polyalkylene polyamine is an imine homopolymer with b. from 0.001 to 0.08 mole of a product obtained by reacting a polyalkylene oxide having from 8 to 100 alkylene oxide units with epichlorohydrin such that from 1.0 to 1.5 moles of epichlorohydrin are present per equivalent of the hydroxyl groups in the polyalkylene oxide, at a temperature of from 20° to 100° C in aqueous solution having a solids content of from 5 to 50% by weight, the reaction being carried to a point at which the viscosity of an aqueous solution containing 20% by weight of the auxiliary is from 300 to 1,500 centipoises (20° C).
Claim 2
Dependent Claim
178 words
A process for the production of paper which comprises adding as drainage and retention aids to an aqueous suspension of cellulosic fibers for making paper sheet, from about 0.01 to 0.3% by weight, based on the dry weight of cellulosic fiber in the pulp, of a water-soluble crosslinked reaction product obtained by reacting a. one equivalent of NH groups of a polyalkylene polyamine having from 15 to 500 alkyleneimine units wherein said polyalkylene polyamine is an imine homopolymer with b. from 0.001 to 0.08 mole of a product obtained by reacting a polyalkylene oxide having from 8 to 100 alkylene oxide units with epichlorohydrin such that from 1.0 to 1.5 moles of epichlorohydrin are present per equivalent of the hydroxyl groups in the polyalkylene oxide, at a temperature of from 20° to 100° C in aqueous solution having a solids content of from 5 to 50% by weight, the reaction being carried to a point at which the viscosity of an aqueous solution containing 20% by weight of the auxiliary is from 300 to 1,500 centipoises (20° C).
Claim 3
Dependent Claim
111 words
A process as set forth in claim 1, wherein component (a) of the crosslinked reaction product is polyethyleneimine and component (b) of said reaction product is a block copolymer having the formula A [(OR.sup.1 ).sub.m (OR.sup.2 ).sub.n (OR.sup.1 ).sub.p OH].sub.x in which R 1 is --CH 2 --CH 2 --; R 2 is ##STR1## m and p both denote values from 4 to 50; n is a valuefrom 0 to 5; x is a value from 2 to 6; and A is a radical of a polyhydric alcohol having from 2 to 6 carbon atoms, a propylene oxide radical or a polypropylene oxide chain having up to 50 propylene oxide units.
Claim 4
Dependent Claim
19 words
A process set forth in claim 1, wherein the amount of component b is from 0.002 to 0.06 mole.
References Cited (Backward Citations)
CA686202A
Cited
US2913356A
Cited
US3129133A
Cited
FR1374669A
Cited
GB1156516A
Cited
GB1179493A
Cited
US3635842A
Cited
US3746678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |