US3993551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for cocrosslinking water soluble polymers and products thereof
Assignee: Union Carbide Corp
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Filing: 1975-06-30
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Granted: 1976-11-23
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Expires: 1995-06-30
Abstract
Abstract Poly(ethylene oxide) and at least one other water soluble polymer are conveniently cocrosslinked by exposing aqueous systems of the polymers to high energy irradiation. The resulting products are insoluble hydrophilic gels which can contain or when dried absorb large quantities of aqueous fluids and hence are useful as absorbing media for disposable absorbent articles, agricultural applications and the like.
Inventors
- 👤 Per G. Assarsson
- 👤 Paul A. King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; A; A01; A01N; A01N25/00; A01N25/08; A01N25/10; A61; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/225; A61L15/42; A61L15/60; C08B; C08B11/00; C08B11/20; C08B15/00; C08B15/10; C08B31/00; C08B31/003; C08L; C08L71/00; C08L71/02; Y; Y10; Y10S; Y10S604/00; Y10S604/904
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
125 words
A process for cocrosslinking at least two water soluble polymers one of which is poly(ethylene oxide) and the other is a second polymer selected from the group consisting of polyacrylic acid, ammonium polyacrylate, vinylmethyl ether-maleic anhydride copolymer and ethylene-maleic anhydride copolymer said process comprising the steps of: a. forming an aqueous solution comprising up to 50 per cent by weight of poly(ethylene oxide) and said second polymer, b. adjusting the pH of said solution to within the range of from about 2 to about 11, c. intimately mixing said solution to form a homogeneous or heterogeneous micro-phase system, and d. before any substantial phase separation, exposing said solution to ionizing radiation of a sufficient dosage and for a period of time to form a gel.
Claim 2
Dependent Claim
125 words
A process for cocrosslinking at least two water soluble polymers one of which is poly(ethylene oxide) and the other is a second polymer selected from the group consisting of polyacrylic acid, ammonium polyacrylate, vinylmethyl ether-maleic anhydride copolymer and ethylene-maleic anhydride copolymer said process comprising the steps of: a. forming an aqueous solution comprising up to 50 per cent by weight of poly(ethylene oxide) and said second polymer, b. adjusting the pH of said solution to within the range of from about 2 to about 11, c. intimately mixing said solution to form a homogeneous or heterogeneous micro-phase system, and d. before any substantial phase separation, exposing said solution to ionizing radiation of a sufficient dosage and for a period of time to form a gel.
Claim 3
Dependent Claim
6 words
The cocrosslinked product of claim 1.
Claim 4
Dependent Claim
20 words
An absorbent product prepared by drying the cocrosslinked product of claim 2 to remove at least some of the water.
Claim 5
Dependent Claim
18 words
A disposable absorbent article containing at least one of said gels prepared by the process of claim 1.
Claim 6
Dependent Claim
12 words
The disposable absorbent article of claim 4 which is a catamenial device.
Claim 7
Dependent Claim
12 words
The disposable absorbent article of claim 4 which is a sanitary napkin.
Claim 8
Dependent Claim
11 words
The disposable absorbent article of claim 4 which is a tampon.
Claim 9
Dependent Claim
11 words
The disposable absorbent article of claim 4 which is a diaper.
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |