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Patent US4354487A successfully refreshed from Google Patents.
US4354487A
Expired / Lapsed
US
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Fiber/absorbent polymer composites and method of forming same
Assignee: Chicopee LLC
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Filing: 1980-05-12
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Granted: 1982-10-19
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Expires: 2000-05-12
Abstract
Abstract There is disclosed a process which comprises: (a) applying an aqueous solution comprising a salt of acrylic or methacrylic acid to an aggregation of fibers; (b) irradiating said aggregation containing said aqueous solution with electromagnetic or corpuscular ionizing radiation to convert said salt of acrylic or methacrylic acid to a water-swellable polymer; (c) individualizing the fibers to disperse the fibers and the said water-swellable polymer; (d) collecting the individualized fibers and water-swellable polymer in the form of a fluffy batt of fibers having distributed therethrough isolated portions of water-swellable polymer affixed to individual fibers or to small groups of fibers.
Inventors
- 👤 Boguslaw Oczkowski
- 👤 Norman Schiff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:44
CPC Classifications
A; A61; A61F; A61F13/00; A61F13/15; A61F13/15577; A61F13/15617; A61F13/15658; A61L; A61L15/00; A61L15/16; A61L15/42; A61L15/60; D; D21; D21H; D21H23/00; D21H23/02; D21H23/22; D21H25/00; D21H25/04; D21H25/06; D21H5/00; D21H5/26; D21H5/2607; D21H5/2628; A61F13/53; A61F2013/530481; A61F2013/530583; A61F2013/530613; A61F2013/530635; A61F2013/530642; Y; Y10; Y10S; Y10S602/00; Y10S602/90; Y10T; Y10T442/00; Y10T442/20; Y10T442/2762; Y10T442/277; Y10T442/2861; Y10T442/2869
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
155 words
Process for producing absorbent, fluffy batts of fibers, which comprises the steps of: (a) applying an aqueous solution comprising a salt of acrylic or methacrylic acid to a surface of an aggregation of fibers, the amount of said solution being sufficient to penetrate said aggregation to a predetermined depth so as contact some but not all of the fibers in said aggregation, said amount being sufficient to provide not more than about 50 weight percent salt, based on weight of fibers; (b) irradiating said aggregation containing aqueous solution with electromagnetic or corpuscular ionizing radiation to convert said salt of acrylic or methacrylic acid to a water-swellable polymer; (c) individualizing the fibers to disperse the water-swellable polymer in the fibers; and (d) collecting the individualized fibers and water-swellable polymer in the form of a fluffy batt of fibers having distributed therethrough isolated portions of water-swellable polymer affixed to individual fibers or to small groups of fibers.
Claim 2
Dependent Claim
155 words
Process for producing absorbent, fluffy batts of fibers, which comprises the steps of: (a) applying an aqueous solution comprising a salt of acrylic or methacrylic acid to a surface of an aggregation of fibers, the amount of said solution being sufficient to penetrate said aggregation to a predetermined depth so as contact some but not all of the fibers in said aggregation, said amount being sufficient to provide not more than about 50 weight percent salt, based on weight of fibers; (b) irradiating said aggregation containing aqueous solution with electromagnetic or corpuscular ionizing radiation to convert said salt of acrylic or methacrylic acid to a water-swellable polymer; (c) individualizing the fibers to disperse the water-swellable polymer in the fibers; and (d) collecting the individualized fibers and water-swellable polymer in the form of a fluffy batt of fibers having distributed therethrough isolated portions of water-swellable polymer affixed to individual fibers or to small groups of fibers.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein said salt is an alkali metal salt.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the alkali metal is sodium.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the acid is acrylic acid.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the aqueous solution contains a small amount of water-soluble, polyfunctional, ethylenically unsaturated compound.
Claim 7
Dependent Claim
17 words
The process of claim 5 wherein said compound is methylene-bis-acrylamide or a polyethylene glycol diacrylate or dimethacrylate.
Claim 8
Dependent Claim
17 words
The process of claim 1 wherein the aqueous solution contains a small amount of a water-soluble polymer.
Claim 9
Dependent Claim
19 words
The process of any of claims 1 through 7 wherein the electromagnetic or corpuscular ionizing radiation is accelerated electrons.
Claim 10
Dependent Claim
10 words
The process of claim 8 wherein the fibers are cellulosic.
Claim 11
Dependent Claim
14 words
The process of claim 8 wherein the aggregation of fibers is wood pulp sheet.
Claim 12
Dependent Claim
24 words
Process of any of claims 1 through 7 which includes the additional step of drying the product of step (b), prior to step (c).
Claim 13
Dependent Claim
10 words
The process of claim 9 wherein the fibers are cellulosic.
Claim 14
Dependent Claim
14 words
The process of claim 9 wherein the aggregation of fibers is wood pulp sheet.
Claim 15
Dependent Claim
14 words
The process of any of claims 1 through 7 wherein the fibers are cellulosic.
Claim 16
Dependent Claim
18 words
The process of any of claims 1 through 7 wherein the aggregation of fibers is wood pulp sheet.
Claim 17
Dependent Claim
16 words
The process of any of claim 1 through 7 wherein the fibers are fusible, thermoplastic fibers.
Claim 18
Dependent Claim
9 words
The product produced by the process of claim 1.
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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) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |