US4966809A
Expired / Lapsed
US
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Water-absorbing composite body
Assignee: Resonac Holdings Corp
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Filing: 1987-04-02
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Granted: 1990-10-30
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Expires: 2007-04-02
Abstract
Abstract Disclosed is a water-absorbing composite body comprising a tape-shaped laminate having at least one layer of a high-melting-point synthetic resin and at least one layer of a low-melting-point synthetic resin, in which at least a part of the low-melting-point synthetic resin layer is exposed to the surface, a split fiber obtained by splitting this tape-shaped laminate or a composite fibrous body having a laminate structure as described above, and a powdery polymeric water absorber fusion-bonded to the outer surface of the low-melting-point synthetic resin layer exposed to the surface. This water-absorbing composite body has a high water-absorbing capacity and retains a good mechanical strength.
Inventors
- 👤 Toyoaki Tanaka
- 👤 Katuzi Ohira
- 👤 Akira Nakamura
- 👤 Ryosuke Kamei
- 👤 Akihiro Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:50
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B7/00; B32B7/02; B32B7/027; A; A61; A61F; A61F13/00; A61F13/15; A61F13/53; A61F13/534; A61F13/539; B32B27/30; B32B27/304; G; G02; G02B; G02B6/00; G02B6/44; G02B6/4401; G02B6/4429; G02B6/44384; A61F2013/530481; A61F2013/53051; A61F2013/53445; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1084; Y10T156/1087; Y10T428/00; Y10T428/25; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2929; Y10T428/2931; Y10T428/2933; Y10T428/2936; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2973; Y10T428/2978; Y10T428/298
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
71 words
A water-absorbing composite body comprising (A) a split yarn obtained by splitting a tape-shaped three-layer laminate composed of a low-melting point synthetic resin layer, a high-melting point synthetic resin layer, and a low-melting point synthetic resin layer, wherein the two low-melting point synthetic resin layers are exposed on the surface of the laminate, and B) a powdery polymeric water-absorber fusion-bonded to the exposed surface of each low-melting point synthetic resin layer.
Claim 2
Dependent Claim
71 words
A water-absorbing composite body comprising (A) a split yarn obtained by splitting a tape-shaped three-layer laminate composed of a low-melting point synthetic resin layer, a high-melting point synthetic resin layer, and a low-melting point synthetic resin layer, wherein the two low-melting point synthetic resin layers are exposed on the surface of the laminate, and B) a powdery polymeric water-absorber fusion-bonded to the exposed surface of each low-melting point synthetic resin layer.
Claim 3
Dependent Claim
33 words
A water-absorbing composite body as set forth in claim 1, wherein the high-melting-point synthetic resin is selected from the group consisting of isotactic polypropylene, high-density polyethylene, a polyester, nylon 6, and nylon 66.
Claim 4
Dependent Claim
62 words
A water-absorbing composite body as set forth in claim 1, wherein the low-melting-point synthetic resin is selected from the group consisting of low-density polyethylene, linear low-density polyethylene, high-density polyethylene, an ethylene/vinyl acetate copolymer, a polyolefin graft-modified with an unsaturated carboxylic acid or an anhydride thereof, an ethylene/maleic anhydride/methyl methacrylate terpolymer, an ethylene/acrylic acid copolymer, an ethylene/ethyl acrylate copolymer and an ionomer resin.
Claim 5
Dependent Claim
32 words
.A water-absorbing composite body as set forth in claim 1, wherein the difference of the melting point between the high-melting-point synthetic resin and the low-melting-point synthetic resin is at least 10° C.
Claim 6
Dependent Claim
22 words
A water-absorbing composite body as set forth in claim 1, wherein the split yarn has a thickness of 500 to 10,000 denier.
Claim 7
Dependent Claim
23 words
A water-absorbing composite body as set forth in claim 1, wherein the split yarn has a split width of 0.03 to 0.2 mm.
Claim 8
Dependent Claim
25 words
A water-absorbing composite body as set forth in claim 1, wherein the powdery polymeric water absorber has a water absorption ratio of 500 to 1,000.
Claim 9
Dependent Claim
42 words
A water-absorbing composite body as set forth in claim 1, wherein the powdery polymeric water absorber is selected from the group consisting of crosslinked poly(sodium acrylate), a saponified acrylic acid/vinyl acetate copolymer, a starch/acrylic acid graft copolymer and an isobutylene/maleic anhydride copolymer.
Claim 10
Dependent Claim
26 words
A water-absorbing composite body as set forth in claim 1, wherein the average particle size of the powdery polymeric water absorber is 10 to 500 μm.
Claim 11
Dependent Claim
26 words
A water-absorbing composite body as set forth in claim 1, wherein the average particle size of the powdery polymeric water absorber is 10 to 300 μm.
Claim 12
Dependent Claim
26 words
A water-absorbing composite body as set forth in claim 1, wherein the average particle size of the powdery polymeric water absorber is 10 to 50 μm.
Claim 13
Dependent Claim
26 words
A water-absorbing composite body as set forth in claim 1, wherein the average particle size of the powdery polymeric water absorber is 10 to 30 μm.
Claim 14
Dependent Claim
35 words
A water-absorbing composite body as set foerth in claim 1, wherein the amount of the fusion-bonded powdery polymeric water absorber is 10 to 60% by weight based on the split yarn before the fusion bonding.
Claim 15
Dependent Claim
34 words
A water-absorbing composite body as set forth in claim 1, wherein the split yarn, to which the powdery polymeric water absorber is fusion-bonded, is wound and enclosed with a tape of a water-soluble resin.
Claim 16
Dependent Claim
17 words
A water-absorbing composite body as set forth in claim 14, wherein the water-soluble resin is polyvinyl alcohol.
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) | 1993-10-29 | 1994-04-30 | 1994-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-29 | 1998-04-30 | 1998-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-29 | 2002-04-30 | 2002-10-30 | $7700.00 | Window Closed / Lapsed |