US4066391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant finish for textiles
Assignee: Wyeth Holdings LLC
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Filing: 1976-02-09
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Granted: 1978-01-03
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Expires: 1996-02-09
Abstract
Abstract Stable, aqueous, flame retardant finishes for cellulosic textile materials employing tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate and urea or a urea-formaldehyde condensate, and, processes employing said finishes are disclosed, together with processes for the preparation of the phosphonium compounds from tris(hydroxymethyl)phosphines.
Inventors
- 👤 Robert George Weyker
- 👤 William Frederick Baitinger, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:09
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/43; D06M15/431; D06M15/667; D06M15/673
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A process for preparing an aqueous flame retardant composition comprising tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate, and a urea or a urea-formaldehyde condensate, or both comprising reacting 1 mole of tris(hydroxymethyl)phosphine, at least 1 mole of formaldehyde and 1 mole of combined orthophosphoric acid and a carboxylic acid, the phosphoric acid representing between 10 and 75 mole percent and the carboxylic acid between 90 and 25 mole percent of the combined acids to obtain a concentrated solution and diluting the concentrated solution with water and adding urea or a urea-formaldehyde condensate in sufficient amount to provide a flameproofing composition containing between 0.5 and 3.0 moles of urea and/or urea-formaldehyde condensate per mole of combined phosphonium salts.
Claim 2
Dependent Claim
114 words
A process for preparing an aqueous flame retardant composition comprising tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate, and a urea or a urea-formaldehyde condensate, or both comprising reacting 1 mole of tris(hydroxymethyl)phosphine, at least 1 mole of formaldehyde and 1 mole of combined orthophosphoric acid and a carboxylic acid, the phosphoric acid representing between 10 and 75 mole percent and the carboxylic acid between 90 and 25 mole percent of the combined acids to obtain a concentrated solution and diluting the concentrated solution with water and adding urea or a urea-formaldehyde condensate in sufficient amount to provide a flameproofing composition containing between 0.5 and 3.0 moles of urea and/or urea-formaldehyde condensate per mole of combined phosphonium salts.
Claim 3
Dependent Claim
46 words
A process for imparting flame retardant properties to cellulosic textile materials comprising (1) applying a finish of tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate, and urea or a urea-formaldehyde condensate, or both to the textile material and (2) heating the textile material to effect a cure of finish thereon.
Claim 4
Dependent Claim
46 words
A process for imparting flame retardant properties to cellulosic textile materials comprising (1) applying a finish of tetrakis(hydroxymethyl)phosphonium phosphate, tetrakis(hydroxymethyl)phosphonium carboxylate, and urea or a urea-formaldehyde condensate, or both to the textile material and (2) heating the textile material to effect a cure of finish thereon.
Claim 5
Dependent Claim
58 words
A process for imparting flame retardant properties to cellulosic textile materials according to claim 2 wherein the finish is comprised of between 10 and 75 mole percent of tetrakis(hydroxymethyl)phosphonium phosphate and between 90 and 25 mole percent of tetrakis(hydroxymethyl)phosphonium carboxylate, and between 0.5 and 3.0 moles of urea and/or urea-formaldehyde condensate per mole of the combined phosphonium salts.
Claim 6
Dependent Claim
33 words
A process for imparting flame retardant properties to cellulosic textile materials according to claim 3 wherein the finish contains between 0 and 0.5 mole of free formaldehyde per mole of combined phosphonium salt.
Claim 7
Dependent Claim
10 words
Cellulosic textile materials produced by the process of claim 2.
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) | 1981-01-02 | 1981-07-04 | 1982-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-02 | 1985-07-04 | 1986-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-02 | 1989-07-04 | 1990-01-03 | $7700.00 | Window Closed / Lapsed |