US4310478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforcing fibers and method of producing same corona treatment of thermoplastic fibers
Assignee: CEMFIBER AS
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Filing: 1979-07-06
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Granted: 1982-01-12
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Expires: 1999-07-06
Abstract
Abstract Reinforcing fibers of plastic having a surface tension of from 40 dyn/cm to about the surface tension of water are disclosed. The fibers can be easily and uniformly disposed in matrices. For organic matrices, a surface tension of 40-50 dyn/cm is effective. For cement matrices, a surface tension about 70-75 dyn/cm is effective. The high surface tensions are obtained by a corona treatment and subsequent application of a hydrophilic avivage. Corona treatment may be performed on the fibers, or on films from which the fibers are made.
Inventors
- 👤 Jorgen Balslev
- 👤 Laust O. Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:14
CPC Classifications
D; D06; D06M; D06M10/00; D06M10/02; D06M10/025; B; B29; B29C; B29C59/00; B29C59/10; D01; D01D; D01D5/00; D01D5/42; D01F; D01F6/00; D01F6/02; D01F6/04; D06M13/00; D06M13/02; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2223/00; D06M2101/00; D06M2101/16; D06M2101/18; D06M2200/00; Y; Y10; Y10S; Y10S264/00; Y10S264/47
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
48 words
A method for producing reinforcing fibers of plastic having a surface tension in the range of from 40 dyn/cm to about the surface tension of water, comprising subjecting plastic reinforcing fibers to a corona treatment, and applying a wetting agent on the fibers subsequent to the corona treatment.
Claim 2
Independent Claim
48 words
A method for producing reinforcing fibers of plastic having a surface tension in the range of from 40 dyn/cm to about the surface tension of water, comprising subjecting plastic reinforcing fibers to a corona treatment, and applying a wetting agent on the fibers subsequent to the corona treatment.
Claim 3
Independent Claim
54 words
A method for producing reinforcing fibers of plastic having a surface tension in the range of from 40 dyn/cm to about the surface tension of water, comprising subjecting a plastic film to a corona treatment, fibrillating the film to form fibers and applying a wetting agent on the fibers subsequent to the corona treatment.
Claim 4
Independent Claim
54 words
A method for producing reinforcing fibers of plastic having a surface tension in the range of from 40 dyn/cm to about the surface tension of water, comprising subjecting a plastic film to a corona treatment, fibrillating the film to form fibers and applying a wetting agent on the fibers subsequent to the corona treatment.
Claim 5
Independent Claim
21 words
A method as claimed in any one of claims 1 or 2 in which the wetting agent is a hydrophilic avivage.
Claim 6
Dependent Claim
26 words
A method as claimed in claim 2 for producing reinforcing fibers of polyolefin, comprising stretching a polyolefin film, corona-treating the film, and fibrillating the corona-treated film.
Claim 7
Dependent Claim
60 words
A method as claimed in claim 4 for producing reinforcing fibers of polypropylene, comprising stretching a polypropylene film in a ratio of at least 1:15 to obtain a film thickness of 10-60μ, corona-treating the stretched film, fibrillating the corona-treated film by means of a rotating needle or cutter roller to obtain fiber filaments of from about 2 to 35 dtex.
Claim 8
Dependent Claim
27 words
A method as claimed in claim 2 for producing reinforcing fibers of polyolefin, comprising stretching a polyolefin film, fibrillating the stretched film, and corona-treating the resulting fibers.
Claim 9
Dependent Claim
61 words
A method as claimed in claim 6 for producing reinforcing fibers of polypropylene, comprising stretching a polypropylene film in a ratio of at least 1:15 to obtain a film thickness of 10-60μ, fibrillating the stretched film by means of a rotating needle or cutter roller to obtain fiber filaments of from about 2 to about 35 dtex, and corona-treating the fibers.
Claim 10
Independent Claim
76 words
A method for producing reinforcing fibers of polypropylene, comprising stretching a polypropylene film in a ratio of at least 1:15, fibrillating the stretched film by means of a needle or cutter roller, and heat stabilizing the resulting fibers, corona treating the heat stabilized fibers and applying a wetting agent on the corona treated fibers to impart to the fibers a surface tension in the range of from 40 dyn/cm to about the surface tension of water.
Claim 11
Independent Claim
76 words
A method for producing reinforcing fibers of polypropylene, comprising stretching a polypropylene film in a ratio of at least 1:15, fibrillating the stretched film by means of a needle or cutter roller, and heat stabilizing the resulting fibers, corona treating the heat stabilized fibers and applying a wetting agent on the corona treated fibers to impart to the fibers a surface tension in the range of from 40 dyn/cm to about the surface tension of water.
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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) | 1985-01-11 | 1985-07-13 | 1986-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-11 | 1989-07-13 | 1990-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-11 | 1993-07-13 | 1994-01-12 | $7700.00 | Window Closed / Lapsed |