US5143786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite fibers, water-absorbing material using the composite fibers as a base material and method for producing the same
Assignee: Resonac Holdings Corp
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Filing: 1991-05-31
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Granted: 1992-09-01
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Expires: 2011-05-31
Abstract
Abstract The present invention uses, as a base material, a multi-layer film comprising more than two layers and formed from thermoplastic resins different in melting point from one another. A sectional construction of the multi-layer film or a tape obtained from the multi-layer film is applied to a sectional construction of a fibre without modification, the multi-layer film or tape being formed into the fibre. The invention provides a composite fibre which is much more excellent as compared to a conventional heat adhesive composite fibre by melt spinning, a water-absorbing material using the composite fibre as a base material and a method for the production of the same by the stated simple means.
Inventors
- 👤 Toyoaki Tanaka
- 👤 Akira Nakamura
- 👤 Yoshisuke Kamei
- 👤 Akihiro Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:52
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; A; A61; A61L; A61L15/00; A61L15/16; A61L15/42; D01; D01D; D01D5/00; D01D5/42; D01F; D01F8/00; D01F8/04; Y; Y10; Y10S; Y10S57/00; Y10S57/907; Y10T; Y10T428/00; Y10T428/249921; Y10T428/29; Y10T428/2904; Y10T428/2909; Y10T428/2913; Y10T428/2922; Y10T428/2924; Y10T428/2929; Y10T428/2931; Y10T442/00; Y10T442/60; Y10T442/637
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
85 words
A water-absorbing material comprising: pulverized pulp, water-absorbing agent and short composite fibers having a length in the range of 70-90 mm; said composite fibers being prepared by stretching a base layer comprising a three-layer film having an intermediate layer of a thermoplastic resin and outer layers of a thermoplastic resin, the resin of the intermediate layer having a higher melting point than the resin of the outer layers, and then splitting said film, said fibers having the same sectional structure as in said base material.
Claim 2
Dependent Claim
85 words
A water-absorbing material comprising: pulverized pulp, water-absorbing agent and short composite fibers having a length in the range of 70-90 mm; said composite fibers being prepared by stretching a base layer comprising a three-layer film having an intermediate layer of a thermoplastic resin and outer layers of a thermoplastic resin, the resin of the intermediate layer having a higher melting point than the resin of the outer layers, and then splitting said film, said fibers having the same sectional structure as in said base material.
Claim 3
Dependent Claim
99 words
A water-absorbing material comprising pulverized pulp, water-absorbing agent and short composite fibers having a length in the range of 70-90 mm; said composite fibers being prepared by stretching a base material, comprising a three-layer film having an intermediate layer of a thermoplastic resin and outer layers of a thermoplastic resin, the resin of the intermediate layer having a higher melting point than the resin of the outer layers, and then discontinuously splitting said film into a net-like arrangement of fibers, said fibers having the same sectional structure as in said base material and being branched due to said splitting.
Claim 4
Dependent Claim
99 words
A water-absorbing material comprising pulverized pulp, water-absorbing agent and short composite fibers having a length in the range of 70-90 mm; said composite fibers being prepared by stretching a base material, comprising a three-layer film having an intermediate layer of a thermoplastic resin and outer layers of a thermoplastic resin, the resin of the intermediate layer having a higher melting point than the resin of the outer layers, and then discontinuously splitting said film into a net-like arrangement of fibers, said fibers having the same sectional structure as in said base material and being branched due to said splitting.
Claim 5
Dependent Claim
35 words
The water-absorbing material as claimed in claim 1, wherein the lower melting point resin comprises high density polyethylene, linear polyethylene or 6-nylon, and where said higher melting point resin comprises polypropylene or an adhesive polyolefin.
Claim 6
Dependent Claim
35 words
The water-absorbing material as claimed in claim 2, wherein the lower melting point resin comprises high density polyethylene, linear polyethylene or 6-nylon, and where said high melting point resin comprises polypropylene or an adhesive polyolefin.
Claim 7
Dependent Claim
17 words
The water-absorbing material as claimed in claim 1, wherein at least one of said layers is colored.
Claim 8
Dependent Claim
17 words
The water-absorbing material as claimed in claim 2, wherein at least one of said layers is colored.
Claim 9
Dependent Claim
16 words
The water-absorbing material as claimed in claim 1, wherein the three layer film comprises a tape.
Claim 10
Dependent Claim
16 words
The water-absorbing material as claimed in claim 2, wherein the three layer film comprises a tape.
Claim 11
Dependent Claim
21 words
The water absorbing material of claim 1 wherein the water absorbing agent is a copolymer of acrylic acid and vinyl acetate.
Claim 12
Dependent Claim
21 words
The water absorbing material of claim 2 wherein the water absorbing agent is a copolymer of acrylic acid and vinyl acetate.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |