Patent US4447294A successfully refreshed from Google Patents.
US4447294A
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US
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Process for making absorbent tissue paper with high wet strength and low dry strength
Assignee: Procter and Gamble Co
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Filing: 1981-12-30
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Granted: 1984-05-08
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Expires: 2001-12-30
Abstract
Abstract A process for making soft, absorbent tissue paper webs and the webs made by that process. In the first step, a furnish of papermaking fibers and a wet strength resin is provided. A wet fibrous web is made from the furnish and the wet web is dried. Next, the wet strength resin in the web is at least partially cured. A nitrogenous cationic debonding agent is then incorporated into the dried web.
Inventors
- 👤 Thomas W. Osborn, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:51
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/03; D21H17/05; D21H17/07; D21H17/20; D21H21/00; D21H21/14; D21H21/18; D21H21/20; D21H25/00; D21H25/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
103 words
A process for making soft, absorbent tissue paper webs comprising the steps of: (a) providing a papermaking furnish comprising papermaking fibers and from about 0.25% to about 3% by weight of said fibers of at least one wet strength resin; (b) forming a wet fibrous web from said papermaking furnish; (c) drying said web until said web contains not more than about 20% by weight moisture; (d) at least partially curing said wet strength resin in said web; and (e) incorporating into said web from about 0.1% to about 2.5% by weight of said fibers of at least one cationic, nitrogenous debonding agent.
Claim 2
Dependent Claim
103 words
A process for making soft, absorbent tissue paper webs comprising the steps of: (a) providing a papermaking furnish comprising papermaking fibers and from about 0.25% to about 3% by weight of said fibers of at least one wet strength resin; (b) forming a wet fibrous web from said papermaking furnish; (c) drying said web until said web contains not more than about 20% by weight moisture; (d) at least partially curing said wet strength resin in said web; and (e) incorporating into said web from about 0.1% to about 2.5% by weight of said fibers of at least one cationic, nitrogenous debonding agent.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said wet strength resin is a water-soluble, cationic resin.
Claim 4
Dependent Claim
108 words
The process of claims 1 or 2 wherein said debonding agent is a quaternary ammonium compound selected from the group consisting of (a) quaternary ammonium compounds having the structure ##STR4## and (b) quaternary ammonium compounds having the structure ##STR5## wherein R is an aliphatic hydrocarbon radical selected from the group consisting of alkyl radicals having from about 12 to about 18 carbon atoms, alkylene radicals having from about 12 to about 18 carbon atoms, coconut, and tallow, X is halogen, m and n are both integers each having a value of at least 1, and the sum of m and n is from about 2 to about 15.
Claim 5
Dependent Claim
101 words
The process of claims 1 or 2 wherein said debonding agent is a bis(alkoxy-2-(hydroxy)propylene quaternary ammonium compound having the structure ##STR6## wherein R 1 and R 2 are each selected from the group consisting of saturated aliphatic groups having from about eight to about twenty-two carbon atoms and unsaturated aliphatic groups having from about eight to about twenty-two carbon atoms; R 3 and R 4 are each selected from the group consisting of methyl, ethyl, and hydroxyethyl; p and q are integers each having a value of from about 2 to about 10; and Y - is a salt forming anion.
Claim 6
Dependent Claim
13 words
The soft, absorbent tissue paper web made by the process of claim 1.
Claim 7
Dependent Claim
13 words
The soft, absorbent tissue paper web made by the process of claim 2.
Claim 8
Dependent Claim
13 words
The soft, absorbent tissue paper web made by the process of claim 3.
Claim 9
Dependent Claim
13 words
The soft, absorbent tissue paper web made by the process of claim 4.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |