US4381320A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-ionic absorbent polymers
Assignee: Chicopee LLC
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Filing: 1981-06-03
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Granted: 1983-04-26
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Expires: 2001-06-03
Abstract
Abstract An absorbent material is produced by exposing an aqueous solution of polyvinyl alcohol and a low molecular weight, water soluble copolymer containing polymerized oxyethylene and oxypropylene units, to sufficient electromagetic or corpuscular ionizing radiation to form a gel.
Inventors
- 👤 Hien V. Nguyen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:34
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; C08J3/02; C08J3/03; C08J3/075; D; D06; D06M; D06M10/00; D06M10/04; D06M10/08; D06M10/10; D06M15/00; D06M15/19; D06M15/21; D06M15/327; D06M15/333; D06M15/37; D06M15/53; C08J2300/00; C08J2300/14; Y; Y10; Y10S; Y10S428/00; Y10S428/913
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
47 words
Process which comprises exposing an aqueous solution of polyvinyl alcohol and a low molecular weight, water-soluble copolymer containing polymerized oxyethylene and oxypropylene units to electromagnetic or corpuscular ionizing radiation of sufficient dosage to form a gel, wherein the molecular weight of said copolymer is below about 12,000.
Claim 2
Dependent Claim
47 words
Process which comprises exposing an aqueous solution of polyvinyl alcohol and a low molecular weight, water-soluble copolymer containing polymerized oxyethylene and oxypropylene units to electromagnetic or corpuscular ionizing radiation of sufficient dosage to form a gel, wherein the molecular weight of said copolymer is below about 12,000.
Claim 3
Dependent Claim
15 words
Process of claim 1 wherein said gel is dried to form a water-swellable, water-insoluble product.
Claim 4
Dependent Claim
17 words
Process of claim 1 wherein said aqueous solution is applied to a fibrous substrate prior to irradiation.
Claim 5
Dependent Claim
17 words
Process of claim 3 wherein the solution is applied to the fibrous substrate in an intermittent pattern.
Claim 6
Dependent Claim
30 words
Process of claim 1, 2, 3, or 4 wherein from about 1/2 to about 10 parts, by weight, of said copolymer are employed per part, by weight, of polyvinyl alcohol.
Claim 7
Dependent Claim
31 words
Process of claim 5 wherein the concentration of said copolymer plus polyvinyl alcohol in said aqueous solution is from about 0.5 to about 4 weight percent, based on total solution weight.
Claim 8
Dependent Claim
15 words
The process of claim 1, 2, 3 or 4 wherein said radiation is accelerated electrons.
Claim 9
Dependent Claim
11 words
The process of claim 5 wherein said radiation is accelerated electrons.
Claim 10
Dependent Claim
9 words
The product produced by the process of claim 1.
Claim 11
Dependent Claim
9 words
The product produced by the process of claim 2.
Claim 12
Dependent Claim
9 words
The product produced by the process of claim 3.
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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |