US4721647A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Absorbent article
Assignee: Kao Corp
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Filing: 1986-05-29
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Granted: 1988-01-26
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Expires: 2006-05-29
Abstract
Abstract An absorbent article comprises a base material of fibers a part or all of which fibers are hydrophobic and a water-absorbent polymer a part or all of which is in the form of substantially spherical particles and has been bonded to said fibers to surround them. Fixation of the polymer is secured. Softness of the base material is maintained.
Inventors
- 👤 Minoru Nakanishi
- 👤 Akira Sakurai
- 👤 Takatoshi Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:16
CPC Classifications
B; B32; B32B; B32B5/00; A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61L; A61L15/00; A61L15/16; A61L15/22; A61L15/24; A61L15/26; A61L15/42; A61L15/60; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; A61F2013/530131; A61F2013/530182; A61F2013/530481; A61F2013/530489; A61F2013/530496; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T442/00; Y10T442/60; Y10T442/637; Y10T442/642
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
50 words
An absorbent article comprising a base material of fibers wherein an effective amount of said fibers are hydrophobic, and a water-absorbent polymer, wherein an effective amount of said water absorbent polymer is in the form of substantially spherical particles wherein said spherical particles wrap around and bond to said fibers.
Claim 2
Dependent Claim
50 words
An absorbent article comprising a base material of fibers wherein an effective amount of said fibers are hydrophobic, and a water-absorbent polymer, wherein an effective amount of said water absorbent polymer is in the form of substantially spherical particles wherein said spherical particles wrap around and bond to said fibers.
Claim 3
Dependent Claim
22 words
An absorbent article as claimed in claim 1 wherein said fibers comprise 5 or more percent by weight of the hydrophobic fibers.
Claim 4
Dependent Claim
21 words
An absorbent article as claimed in claim 1, wherein said fiberss comprise 50 or more percent by weight of hydrophobic fibers.
Claim 5
Dependent Claim
30 words
An absorbent article as claimed in claim 1, in which said hydrophobic fibers consist of filaments having an advancing contact angle of 50° to 100° against 1 cc of water.
Claim 6
Dependent Claim
27 words
An absorbent article as claimed in claim 1, in which said hydrophobic fibers are selected from polyester fibers, polypropylene fibers and conjugated fibers of polyethylene and polypropylene.
Claim 7
Dependent Claim
27 words
An absorbent article as claimed in claim 1, in which said hydrophobic fibers consist of hydrohilic fibers which have been treated on the surface to become hydrophobic.
Claim 8
Dependent Claim
39 words
An absorbent article as claimed in claim 1, in which said water-absorbent polymer has been bonded to said fibers in the form of spherical or ellipsoidal beads having been tied one to another in a row like a rosary.
Claim 9
Dependent Claim
25 words
An absorbent article as claimed in claim 1, in which said base material comprises a layer of hydrophilic fibers and a layer of hydrophobic fibers.
Claim 10
Dependent Claim
66 words
An absorbent article as claimed in claim 1, which is obtained by a process comprising the steps of applying in the form of drops an aqueous solution of a water-soluble, ethylenically unsaturated monomer to a base material so that an effective amount of the solution drops may wrap and bond to the fibers, polymerizing said monomer to produce the water-absorbent polymer, and drying the resultant article.
Claim 11
Dependent Claim
26 words
A process as claimed in claim 9, in which said monomer is selected from acrylic acid, methacrylic acid, vinylsulfonic acid, vinylphosphonic acid and a salt thereof.
References Cited (Backward Citations)
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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) | 1991-01-25 | 1991-07-27 | 1992-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-25 | 1995-07-27 | 1996-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-25 | 1999-07-27 | 2000-01-26 | $7700.00 | Window Closed / Lapsed |