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US3607356A
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Imparting flame resistance to fibrous textiles from an alkaline medium
Assignee: United States Department of Agriculture
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Filing: 1968-10-04
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Granted: 1971-09-21
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Expires: 1988-10-04
Abstract
Abstract Flame resistance has been imparted to fibrous textiles by application of an aqueous alkaline solution containing tris (hydroxymethyl) phosphine (heretofore referred to as THP) and tetrakis (hydroxymethyl) phosphonium hydroxide (heretofore referred to as THPOH) followed by heat drying to 10-20 percent moisture content, and finally polymerizing the phosphorous material in the fabric with ammonia vapor. The invention provides an improved process for flameproofing textiles, particularly lightweight apparel fabrics whereby the resulting treated textile materials are rendered flame resistant with little or no loss in tearing strength and tensile strength or undesirable change in hand. Cellulosic textiles treated by this process retain their flame resistant properties after repeated laundering.
Inventors
- 👤 John V Beninate
- 👤 Eileen K Boylston
- 👤 George L Drake Jr
- 👤 Wilson A Reeves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:44
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/285; D06M15/00; D06M15/19; D06M15/37; D06M15/667; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T442/00; Y10T442/20; Y10T442/2041; Y10T442/2098; Y10T442/2631; Y10T442/2672; Y10T442/268; Y10T442/2689; Y10T442/2762; Y10T442/277
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
133 words
A process for imparting flame resistance to a lightweight, fibrous, cellulose-containing or wool textile material, said process consisting of: a. impregnating the textile material with a solution having a pH of about from 7.5 to 7.9 and a total monomeric tris(hydroxymethyl)phosphine content of about from 10 percent to 40 percent, to a wet pickup of about from 70 percent to 100 percent; b. drying the thus-impregnated textile material to a moisture content of about from 10 percent to 20 percent; c. treating the thus-dried textile material with a high concentration of ammonia gas for about from 2 to 6 minutes at room temperature to deposit within and on the fibrous structure of the textile material a polymerized phosphorus-containing material; and d. washing and drying the resulting polymer-containing textile material to remove unreacted substances.
Claim 2
Dependent Claim
133 words
A process for imparting flame resistance to a lightweight, fibrous, cellulose-containing or wool textile material, said process consisting of: a. impregnating the textile material with a solution having a pH of about from 7.5 to 7.9 and a total monomeric tris(hydroxymethyl)phosphine content of about from 10 percent to 40 percent, to a wet pickup of about from 70 percent to 100 percent; b. drying the thus-impregnated textile material to a moisture content of about from 10 percent to 20 percent; c. treating the thus-dried textile material with a high concentration of ammonia gas for about from 2 to 6 minutes at room temperature to deposit within and on the fibrous structure of the textile material a polymerized phosphorus-containing material; and d. washing and drying the resulting polymer-containing textile material to remove unreacted substances.
Claim 3
Dependent Claim
13 words
The process of claim 1 whereiN the textile material is a cellulose-containing material.
Claim 4
Dependent Claim
18 words
The process of claim 2 wherein the cellulose-containing material is cotton, paper, jute, rayon-cotton blend, or polyester-cotton blend.
Claim 5
Dependent Claim
11 words
The process of claim 3 wherein the textile material is wool.
Claim 6
Dependent Claim
11 words
The process of claim 3 wherein the cellulose-containing material is cotton.
Claim 7
Dependent Claim
11 words
The process of claim 3 wherein the cellulose-containing material is paper.
Claim 8
Dependent Claim
11 words
The process of claim 3 wherein the cellulose-containing material is jute.
Claim 9
Dependent Claim
12 words
The process of claim 3 wherein the cellulose-containing material is rayon-cotton blend.
Claim 10
Dependent Claim
12 words
The process of claim 3 wherein the cellulose-containing material is polyester-cotton blend.
Claim 11
Dependent Claim
9 words
The product produced by the process of claim 2.
Claim 12
Dependent Claim
9 words
The product produced by the process of claim 4.
Claim 13
Dependent Claim
9 words
The product produced by the process of claim 5.
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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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |