US3816159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for applying an aqueous dispersion of short, binder coated fibers to a drylaid nonwoven fabric
Assignee: Fiber Technology Corp
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Filing: 1971-12-09
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Granted: 1974-06-11
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Expires: 1991-12-09
Abstract
Abstract Nonwoven fabrics of improved abrasion resistance are produced by applying to a dry-laid fibrous web an aqueous dispersion of ultra-short fibers of 50 to 300 microns in length, said ultrashort fibers being coated with a polymeric binder and being suspended in an aqueous phase which is substantially free of binder. The dry-laid fibrous web may be bonded in a separate operation, optionally with a different polymeric binder and in a discontinuous pattern.
Inventors
- 👤 N Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:20
CPC Classifications
D; D04; D04H; D04H1/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
The process according to claim 1 in which the aqueous dispersion of binder-coated, substantially unhydrated and unbeaten ultrashort fibers is formed by concentrating in aqueous phase a polyelectrolyte onto the fibers, adding a polymeric binder to the aqueous phase, and agitating the mixture until the clarity of the water phase indicates that substantially all of the binder is attached to the solid ultrashort fibers.
Claim 2
Dependent Claim
23 words
The process according to claim 1 in which the dry-laid fleece comprises textile-length fibers of between one-quarter inch and six inches in length.
Claim 3
Dependent Claim
21 words
The process according to claim 1 in which the dry-laid fleece comprises continuous filaments with an overlay of textile-length rayon fibers.
Claim 4
Dependent Claim
25 words
The process according to claim 4 in which the continuous filaments are bonded to each other at at least two of their points of intersection.
Claim 5
Dependent Claim
37 words
The process according to claim 1 in which the dry-laid fleece comprises a mixture of textile-length fibers of between one-quarter and six inches in length and unbeaten, non-fibrillated fibers of between 1,000 and 5,000 microns in length.
Claim 6
Dependent Claim
24 words
The process according to claim 1 in which the dry-laid fleece comprises air-laid unbeaten and non-fibrillated fibers of 1,000 to 5,000 microns in length.
Claim 7
Dependent Claim
24 words
The process according to claim 1 in which the aqueous dispersion of ultrashort fibers is of between 1 percent and 4 percent fiber concentration.
Claim 8
Dependent Claim
28 words
The process according to claim 1 in which the binder coating on the ultrashort fibers is between 5 percent and 100 percent of the weight of said fibers.
Claim 9
Dependent Claim
21 words
The process according to claim 3 in which the dry-laid fibrous fleece of textile-length fibers is bonded in a secondary operation.
Claim 10
Dependent Claim
41 words
The process according to claim 10 in which the dry-laid textile-length fibers are bonded at at least two of their points of intersection in a discontinuous bonding operation leaving substantial portions of the lengths of said fibers free of bonding material.
Claim 11
Dependent Claim
63 words
The process according to claim 4 in which the dry-laid fleece of continuous filaments with an overlay of textile-length rayon fibers is bonded in a secondary bonding operation wherein a binding agent is applied to said fleece in a pattern of discrete and spaced-apart areas, the binder in said areas extending through the continuous filaments and into the overlying layer of rayon fibers.
Claim 12
Dependent Claim
113 words
The process for providing a nonwoven fabric of improved abrasion resistance which comprises: assembling an unspun and unwoven dry-laid fibrous fleece; forming a dispersion of binder-coated fibers by suspending substantially unhydrated and unbeaten ultrashort fibers of between 50 and 300 microns in length in water containing a polymeric binder, and precipitating anD coating the binder onto said ultrashort fibers until the water phase is clear and substantially free of binder; applying to said fleece on one face thereof said aqueous dispersion of binder-coated fibers; applying to said fleece a secondary bonding agent; applying a second deposit of said binder-coated fibers to the other face of said fleece; and drying the fabric thus formed.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |