US4256524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for solvent bonding blended nonwoven fabrics and fabric produced therefrom
Assignee: Fitesa Simpsonville Inc
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Filing: 1976-11-26
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Granted: 1981-03-17
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Expires: 1996-11-26
Abstract
Abstract A process for solvent bonding blended nonwoven fabrics is disclosed. The fabric is obtained by forming a web from a blend of fibers selected from the group consisting of acrylic fibers, modacrylic fibers and mixtures thereof and polyester fibers, applying a controlled amount of solvent to the web, and then bonding contiguous fibers at their cross-over points by the application of heat and pressure so as to activate the solvent. The fabric thereby obtained is characterized by improved elongation and tear strength.
Inventors
- 👤 Jerry B. Hare
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:13
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; C; C08; C08J; C08J5/00; C08J5/12; C08J5/122; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1039; Y10T156/1041; Y10T428/00; Y10T428/24; Y10T428/24479; Y10T428/24595; Y10T428/24603; Y10T428/29; Y10T428/2904; Y10T428/2905; Y10T442/00; Y10T442/60; Y10T442/601; Y10T442/69; Y10T442/692
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
A process for manufacturing nonwoven fabrics having improved elongation and tear strength, comprising the steps: forming a web from a blend of fibers selected from the group consisting of acrylic fibers, modacrylic fibers and mixtures thereof, and polyester fibers; applying a controlled amount of a fiber solvent, said solvent being selected from the group consisting of ethylene carbonate, propylene carbonate and mixtures thereof, to the web, wherein said amount is up to about 10% of the weight of said web; and bonding contiguous fibers at their cross-over points by the application of heat and pressure so as to activate the solvent.
Claim 2
Dependent Claim
101 words
A process for manufacturing nonwoven fabrics having improved elongation and tear strength, comprising the steps: forming a web from a blend of fibers selected from the group consisting of acrylic fibers, modacrylic fibers and mixtures thereof, and polyester fibers; applying a controlled amount of a fiber solvent, said solvent being selected from the group consisting of ethylene carbonate, propylene carbonate and mixtures thereof, to the web, wherein said amount is up to about 10% of the weight of said web; and bonding contiguous fibers at their cross-over points by the application of heat and pressure so as to activate the solvent.
Claim 3
Dependent Claim
27 words
The process defined in claim 1 wherein said blend contains from about 5% to about 50% by weight of polyester fibers and the balance essentially acrylic fibers.
Claim 4
Dependent Claim
21 words
The process defined in claim 2 wherein said blend contains from about 10% to about 30% by weight of polyester fibers.
Claim 5
Dependent Claim
27 words
The process defined in claim 1 wherein said blend contains from about 5% to about 30% by weight of polyester fibers and the balance essentially modacrylic fibers.
Claim 6
Dependent Claim
16 words
The process defined in claim 1 wherein said polyester fibers are made of polyethylene terephthalate polymer.
Claim 7
Dependent Claim
29 words
The process defined in claim 1 wherein the solvent is simultaneously applied to both sides of said web in the form of a mist prepared from an aqueous solution.
Claim 8
Dependent Claim
21 words
The process defined in claim 1 wherein the web is bonded by applying pressure from a pair of opposed smooth surfaces.
Claim 9
Dependent Claim
23 words
The process defined in claim 1 wherein the web is bonded by applying pressure from a smooth surface and an opposed embossed surface.
References Cited (Backward Citations)
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US3236587A
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US3117055A
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US3574523A
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US3291677A
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |