US3755220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulosic sheet material having a thermosetting resin bonder and a surfactant debonder and method for producing same
Assignee: Kimberly Clark Tissue Co
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Filing: 1971-10-13
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Granted: 1973-08-28
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Expires: 1991-10-13
Abstract
Abstract Cellulosic sheet materials having an improved ratio of wet tensile strength to dry tensile strength comprise cellulosic fibers; at least one debonder selected from the group consisting of anionic and cationic surface active agents; and a cationic thermosetting resin such as those normally employed to increase the wet strength of paper.
Inventors
- 👤 B Freimark
- 👤 R Schaftlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:25
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/51; D21F; D21F11/00; D21F11/14; D21H17/03; D21H17/05; D21H17/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
19 words
A method, as claimed in claim 1, in which the resin in the furnish is a cationic urea-formaldehyde resin.
Claim 2
Dependent Claim
19 words
A method, as claimed in claim 1, in which the resin in the furnish is a cationic melamine-formaldehyde resin.
Claim 3
Dependent Claim
16 words
A method, as claimed in claim 1, in which the cellulosic fibers are wood pulp fibers.
Claim 4
Dependent Claim
93 words
A cellulosic sheet material having an improved ratio of wet tensile strength to dry tensile strength comprising cellulosic fibers, at least one debonder selected from the group consisting of anionic surface active agents and cationic quaternary ammonium surface active agents, and at least one cationic thermosetting resin in which the amount of the resin is equal to from about 0.1% to about 4.0% of the bone dry weight of the fibers employed, and the amount of debonder is equal to up to about 1.5% of the bone dry weight of the fibers employed.
Claim 5
Dependent Claim
28 words
A cellulosic sheet material, as claimed in claim 5, in which the debonder is a cationic quaternary ammonium surface active agent and the resin is a urea-formaldehyde resin.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |