US4615689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing paperlike products from fibers threaded with polymer
Assignee: Mobil Oil AS
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Filing: 1984-12-31
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Granted: 1986-10-07
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Expires: 2004-12-31
Abstract
Abstract Fibers, such as wood fibers, are treated with a solvent solution of a thermoplastic polymer, e.g., polypropylene; the solvent is removed; and the treated fibers are fused into an article such as a fiber-polymer sheet or a board.
Inventors
- 👤 James G. Murray
- 👤 Harold G. Tinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:41
CPC Classifications
D; D21; D21H; D21H11/00; D21H11/16; D21H11/20; D21H5/00; D21H5/12; D21H5/1272
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
83 words
A method for preparing a film-polymer product comprising the sequential steps of: (a) treating separated fibers with a heated solvent solution of a polyolefin polymer to coat the fibers; (b) precipitating the polymer on the fibers by cooling the coated fibers to a temperature at which the polyolefin is not soluble; (c) removing at least the major portion of the solvent as a liquid; (d) heat treating the coated fibers at a temperature sufficient to fuse the polymer and to form an article.
Claim 2
Independent Claim
83 words
A method for preparing a film-polymer product comprising the sequential steps of: (a) treating separated fibers with a heated solvent solution of a polyolefin polymer to coat the fibers; (b) precipitating the polymer on the fibers by cooling the coated fibers to a temperature at which the polyolefin is not soluble; (c) removing at least the major portion of the solvent as a liquid; (d) heat treating the coated fibers at a temperature sufficient to fuse the polymer and to form an article.
Claim 3
Dependent Claim
12 words
The method of claim 1 in which said fibers are cellulose fibers.
Claim 4
Dependent Claim
12 words
The method of claim 1 in which said article is a sheet.
Claim 5
Dependent Claim
12 words
The method of claim 1 in which said article is a container.
Claim 6
Dependent Claim
12 words
The method of claim 1 in which said polymer is a polyolefin.
Claim 7
Dependent Claim
17 words
The method of claim 1 in which said polymer is a polymer of ethylene or of propylene.
Claim 8
Dependent Claim
41 words
The method of claim 1 in which said fibers are in the form of an air-laid mat, the mat is treated with the polyolefin solution, the solvent is removed and the mat is formed into a sheet under heat and pressure.
Claim 9
Dependent Claim
32 words
The method of claim 1 in which said polyolefin treated fibers are dispersed in an aqueous medium, formed into a sheet on papermaking equipment, and the sheet treated under heat and pressure.
Claim 10
Dependent Claim
22 words
The method of claim 1 in which the fibers are cellulosic fibers, the polyolefin polymer is polypropylene, and said solvent is xylene.
Claim 11
Dependent Claim
13 words
The method of claim 1 in which said fibers are wood fiber fluff.
Claim 12
Dependent Claim
14 words
The method of claim 9 in which said cellulosic fibers are wood fiber fluff.
Claim 13
Dependent Claim
21 words
The method of claim 1 in which said polymer treated fibers are deposited with additional fibers which are not polymer treated.
Claim 14
Dependent Claim
13 words
The method of claim 12 in which said additional fibers are cellulosic fibers.
Claim 15
Dependent Claim
13 words
The method of claim 12 in which said additional fibers are glass fibers.
Claim 16
Dependent Claim
21 words
The method of claim 1 in which the ratio of said polyolefin polymer to said fibers is from 0.1:1 to 2:1.
Claim 17
Dependent Claim
17 words
The method of claim 1 in which said step (d) is conducted with the application of pressure.
References Cited (Backward Citations)
US2739058A
Cited
US3173829A
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US3644251A
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US3804706A
Cited
US4081318A
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US4286977A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |