US4869953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-resistant microporous coatings
Assignee: Burlington Industries Inc
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Filing: 1988-08-30
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Granted: 1989-09-26
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Expires: 2008-08-30
Abstract
Abstract Water-vapor-permeable yet waterproof coated fabrics are prepared by applying a polyurethane resin solvent solution plus flame retardent to a base fabric then immersing the coating to coagulate the resin leaving a thin, microporous coating on the fabric. An acrylic acid thickener system may be included in the resin solvent solution. The resultant microporous coated fabric has a moisture vapor transmission rate of at least 600 g/m2/24 hours, a hydrostatic pressure resistance of at least 69 kPa and is resistant to flame.
Inventors
- 👤 Thomas F. Watson
- 👤 Donald R. Towery, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:52
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; D06N3/142; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/31504; Y10T428/31551; Y10T442/00; Y10T442/20; Y10T442/2139; Y10T442/2148; Y10T442/2221; Y10T442/2246; Y10T442/2631; Y10T442/2656
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A process of preparing a flame retardant waterproof, water-vapor-permeable, coated fabric having a microporous polyurethane layer thereon formed by the wet coagulation method, said process comprising the steps of: (a) applying to the base fabric a water-miscible, polar organic solvent coating solution of an aromatic polyurethane elastomer dissolved in the polar organic solvent, (b) immersing the thus-coated base fabric into an aqueous coagulation bath to extract the solvent from the polymer solution causing the previously dissolved polyurethane elastomer to coagulate on the base fabric leaving a porous aromatic polyurethane matrix formed directly on and adhered to the base fabric, then (c) washing and drying the coated fabric, wherein the polyurethane elastomer solution contains a flame-retarding amount of a flame retardant and the resulting microporous layer has the flame retardant imparted therein and has surface pores therein of one micron or less.
Claim 2
Dependent Claim
141 words
A process of preparing a flame retardant waterproof, water-vapor-permeable, coated fabric having a microporous polyurethane layer thereon formed by the wet coagulation method, said process comprising the steps of: (a) applying to the base fabric a water-miscible, polar organic solvent coating solution of an aromatic polyurethane elastomer dissolved in the polar organic solvent, (b) immersing the thus-coated base fabric into an aqueous coagulation bath to extract the solvent from the polymer solution causing the previously dissolved polyurethane elastomer to coagulate on the base fabric leaving a porous aromatic polyurethane matrix formed directly on and adhered to the base fabric, then (c) washing and drying the coated fabric, wherein the polyurethane elastomer solution contains a flame-retarding amount of a flame retardant and the resulting microporous layer has the flame retardant imparted therein and has surface pores therein of one micron or less.
Claim 3
Dependent Claim
26 words
The process of claim 1, in which the coated fabric has a bromine content of at least 3% based upon the weight of the coated fabric.
Claim 4
Dependent Claim
23 words
The process of claim 1, in which the flame retardant is hexabromocyclododecane pentabromodiphenyl oxide bis(tribromophenoxy)ethane, or a copolymer of vinylidene difluoride and hexafluoropropylene.
Claim 5
Dependent Claim
18 words
The process of claim 3, in which the flame retardant is a mixture of antimony oxide and hexabromocyclododecane.
Claim 6
Dependent Claim
53 words
The process of claim 1, in which the resulting flame-resistant, water-roof, water-vapor-permeable, coated fabric has a moisture vapor transmission rate of at least 600 g/m 2 /24 hours, a hydrostatic pressure resistance of at least 69 kPa and a bromine content of at least 3% based upon the weight of the coated fabric.
Claim 7
Dependent Claim
164 words
A process of preparing a flame retardant, waterproof, water-vapor-permeable, coated fabric having a microporous polyurethane layer thereon formed by the wet coagulation method, said process comprising the steps of: (a) applying to a base fabric a water-miscible, polar organic solvent coating solution of an aromatic polyurethane elastomer dissolved in the polar organic solvent and a bromine-containing flame retardant, (b) immersing the thus-coated base fabric into an aqueous coagulation bath to extract the solvent from the polymer solution causing the previously dissolved polyurethane elastomer to coagulate on the base fabric leaving a porous aromatic polyurethane matrix with the bromine-containing flame retardant therein formed directly on and adhered to the base fabric, then (c) washing and drying the coated fabric, so that the resulting flame-resistant, waterproof, water-vapor-permeable, coated fabric has a moisture vapor transmission rate of least 600g/m 2 /24 hours, a hydrostatic pressure resistance of at least 69 kPa and a bromine content of at least 3% based upon the weight of the coated fabric.
Claim 8
Dependent Claim
164 words
A process of preparing a flame retardant, waterproof, water-vapor-permeable, coated fabric having a microporous polyurethane layer thereon formed by the wet coagulation method, said process comprising the steps of: (a) applying to a base fabric a water-miscible, polar organic solvent coating solution of an aromatic polyurethane elastomer dissolved in the polar organic solvent and a bromine-containing flame retardant, (b) immersing the thus-coated base fabric into an aqueous coagulation bath to extract the solvent from the polymer solution causing the previously dissolved polyurethane elastomer to coagulate on the base fabric leaving a porous aromatic polyurethane matrix with the bromine-containing flame retardant therein formed directly on and adhered to the base fabric, then (c) washing and drying the coated fabric, so that the resulting flame-resistant, waterproof, water-vapor-permeable, coated fabric has a moisture vapor transmission rate of least 600g/m 2 /24 hours, a hydrostatic pressure resistance of at least 69 kPa and a bromine content of at least 3% based upon the weight of the coated fabric.
Claim 9
Dependent Claim
25 words
The process of claim 6, in which the coated fabric has a microporous layer with surface pores therein of at most one micron in diameter.
Claim 10
Dependent Claim
65 words
A flame-resistant, waterproof, water-vapor-permeable, coated fabric having micropores therein of at most one micron in diameter, a moisture vapor transmission rate of at least 600 g/m 2 /24 hours, a hydrostatic pressure resistance of at least 69 kPa, and a bromine content of at least 3% based on the weight of the fabric, and a mixture of antimony oxide plus hexabromocyclododecane as the flame retardant.
Claim 11
Dependent Claim
65 words
A flame-resistant, waterproof, water-vapor-permeable, coated fabric having micropores therein of at most one micron in diameter, a moisture vapor transmission rate of at least 600 g/m 2 /24 hours, a hydrostatic pressure resistance of at least 69 kPa, and a bromine content of at least 3% based on the weight of the fabric, and a mixture of antimony oxide plus hexabromocyclododecane as the flame retardant.
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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) | 1992-09-25 | 1993-03-27 | 1993-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-25 | 1997-03-27 | 1997-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-25 | 2001-03-27 | 2001-09-26 | $7700.00 | Window Closed / Lapsed |