Patent US4169121A successfully refreshed from Google Patents.
US4169121A
Expired / Lapsed
US
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Absorbent material for aqueous physiological fluids and process for its production
Assignee: Individual
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Filing: 1977-09-09
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Granted: 1979-09-25
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Expires: 1997-09-09
Abstract
Abstract An absorbent material is provided having exceptional fluid suction and holding power for aqueous physiological fluids, and which is thus especially adaptable for use as tampons, sanitary napkins, baby diapers, hospital pads and the like. The material consists essentially of cellulose fibers containing from 5 to 20% by weight of sodium carboxymethyl cellulose. The material is formed by a process in which a viscose spinning solution is produced from cellulose xantogenate by dissolving in aqueous caustic soda solution and permitting the solution to ripen, spinning the latter in an acid spinning bath, and then cleaning and drying the resultant threads, the spinning solution containing 5 to 20% by weight of sodium carboxymethyl cellulose.
Inventors
- 👤 Helmut Pietsch
- 👤 Walter Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:50
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/02; C08L1/06; A; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/28; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
In a process for the production of a tampon or like hygienic article having high fluid suction and holding power for aqueous physiological fluids, in which a viscose spinning solution is produced from cellulose xantogenate by dissolving in aqueous caustic soda, aging said spinning solution, spinning aged solution in an acid spinning bath, and cleaning and drying the resultant fibers the improvement consisting of, adding to the spinning solution about 5 to 20% by weight, of sodium carboxymethyl cellulose, based on the cellulose contained in the solution, cleaning partly reticulated fibers obtained, in an acid solution, formalizing the fibers, regenerating the sodium salt and washing the fibers until neutral.
Claim 2
Dependent Claim
109 words
In a process for the production of a tampon or like hygienic article having high fluid suction and holding power for aqueous physiological fluids, in which a viscose spinning solution is produced from cellulose xantogenate by dissolving in aqueous caustic soda, aging said spinning solution, spinning aged solution in an acid spinning bath, and cleaning and drying the resultant fibers the improvement consisting of, adding to the spinning solution about 5 to 20% by weight, of sodium carboxymethyl cellulose, based on the cellulose contained in the solution, cleaning partly reticulated fibers obtained, in an acid solution, formalizing the fibers, regenerating the sodium salt and washing the fibers until neutral.
Claim 3
Independent Claim
78 words
A method which comprises formalizing 100 parts of a mixed fiber of about 90% cellulose and 10% sodium carboxymethyl cellulose, in a bath consisting of 50% by weight of 37% concentrated hydrochloric acid and about 20% by weight formaldehyde solution, washing the fiber neutral with water, then placing the fiber into a 10% solution of sodium hydrogen carbonate, regenerating the sodium salt of the carboxymethyl cellulose, then washing the fibers neutral again, in water containing 0.5% polyethylene glycol.
Claim 4
Independent Claim
78 words
A method which comprises formalizing 100 parts of a mixed fiber of about 90% cellulose and 10% sodium carboxymethyl cellulose, in a bath consisting of 50% by weight of 37% concentrated hydrochloric acid and about 20% by weight formaldehyde solution, washing the fiber neutral with water, then placing the fiber into a 10% solution of sodium hydrogen carbonate, regenerating the sodium salt of the carboxymethyl cellulose, then washing the fibers neutral again, in water containing 0.5% polyethylene glycol.
Claim 5
Dependent Claim
31 words
The method which comprises carding the fiber prepared according to claim 2, forming the carded fibers to form strips 50 mm. wide, and winding and pressing the strips to form tampons.
References Cited (Backward Citations)
US3423167A
Cited
US3843378A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |