US3787256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven sheet structures from modified polyolefin fibers
Assignee: Fort James Corp
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Filing: 1971-09-13
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Granted: 1974-01-22
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Expires: 1991-09-13
Abstract
Abstract A sheet structure prepared from modified polyolefin fibers and a method of preparation of the structure. The fibers are modified by introducing thereinto halide groups and acid groups with disassociatable hydrogen ions, and from this a stabilized water dispersion is prepared. A mat is prepared from the dispersion of fibers.
Inventors
- 👤 K Nowotny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:03
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D21H17/00; D21H17/03; D21H17/05; D21H17/11; D21H5/00; D21H5/12; D21H5/1254
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
The method of claim 1 which further comprises immersing the modified fibers in an aqueous latex composition to produce retention on the modified fibers of the resin latex.
Claim 2
Dependent Claim
41 words
The method of claim 1 which further comprises the step of applying heat to the formed mat to produce softening of the fibers, and then cooling the mat to produce interadhesion through fusion bonding of the modified fibers in the mat.
Claim 3
Dependent Claim
26 words
The method of claim 3, wherein such heating is insufficient to integrate completely the fibers in the mat as evidenced by retained opacity in the mat.
Claim 4
Dependent Claim
35 words
The method of claim 1, wherein after processing of the fibers to modify them the fibers are separated from each other with a compressed stream of gas to promote dispersion of the fibers in water.
Claim 5
Dependent Claim
23 words
The method of claim 1, which further comprises mixing with the modified polyolefin fibers wood fibers to form a dispersion of mixed fibers.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein the polyolefin fibers have a surface area greater than 1.0 m2/gm.
Claim 7
Dependent Claim
53 words
The method of claim 1 which further comprises preparing a laminate from the mat formed by placing a sheet of material against the mat, and applying heat to the laminate to produce softening and interadhesion of the modified fibers in the mat and adhesion of the fibers to the sheet in the laminate.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |