US4276345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing a surface exit of fibers from an unwoven fabric, through a very thin layer of emulsified latex, and product thereby obtained
Assignee: Prato Commerz SpA
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Filing: 1979-07-09
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Granted: 1981-06-30
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Expires: 1999-07-09
Abstract
Abstract A method for preventing surface exit of piles from a fabric through a very thin layer of spreading and product thereby obtained, wherein the base or support intended to be spread with acryl resins or butadiene-acrylonitrile in emulsion is previously imbued with emulsion destabilizers building up the coagulation of the emulsion as the resin contacts the fabric.
Inventors
- 👤 Marco Maranghi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:49
CPC Classifications
D; D06; D06M; D06M23/00; D06M23/16; D06M23/18; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/587; D04H1/64; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T442/00; Y10T442/20; Y10T442/2369
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
In a process for preventing surface-hairiness and surface exit of fibers from a non-woven fabric which comprises the step of applying to the surface of the fabric an emulsion latex of an acrylic or butadieneacrylonitrile resin the improvement which comprises the steps of (a) impregnating the non-woven fabric with a solution of an emulsion-destabilizing electrolyte salt, (b) spreading onto the surface of the impregnated fabric a layer of an emulsion latex of the resin, which layer is of sufficiently low thickness not to cause hardening or stiffening of the fabric.
Claim 2
Dependent Claim
90 words
In a process for preventing surface-hairiness and surface exit of fibers from a non-woven fabric which comprises the step of applying to the surface of the fabric an emulsion latex of an acrylic or butadieneacrylonitrile resin the improvement which comprises the steps of (a) impregnating the non-woven fabric with a solution of an emulsion-destabilizing electrolyte salt, (b) spreading onto the surface of the impregnated fabric a layer of an emulsion latex of the resin, which layer is of sufficiently low thickness not to cause hardening or stiffening of the fabric.
Claim 3
Dependent Claim
25 words
The process as defined in claim 1 wherein the electrolyte salt is selected from the group consisting of sodium chloride, calcium chloride and aluminum sulphate.
Claim 4
Dependent Claim
58 words
The process as defined in claim 1 wherein step (a) further comprises reducing the moisture content of the impregnated fabric to such a residual moisture content that a residual amount of electrolyte salt is retained in the impregnated fabric which is sufficient to induce coagulation of the resin and partially prevent penetration of the resin into the fabric.
Claim 5
Dependent Claim
33 words
The process as defined in claim 1 which further comprises the step of sufficiently drying the impregnated fabric to obtain covering of the surface of the fabric with crystals of the electrolyte salt.
Claim 6
Dependent Claim
20 words
The process as defined in claim 1 wherein the layer of emulsion latex has a thickness of about 0.5 mm.
Claim 7
Dependent Claim
28 words
A soft non-woven fabric comprising a hair-free surface coated with a film of an acryl resin or butadieneacrylonitrile resin prepared by the method as defined in claim 4.
References Cited (Backward Citations)
US2027322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |