US3765837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant finish for polyester/cotton blends
Assignee: Burlington Industries Inc
•
Filing: 1971-09-03
•
Granted: 1973-10-16
•
Expires: 1991-09-03
Abstract
Abstract A process for decreasing the flammability of textiles comprising a cellulosic fiber component and preferably a nitrogen-free thermoplastic fiber component which comprises treating the cellulosic fiber component with a condensate or a physical admixture of an allylurea and a phosphine/formaldehyde condensate such as a tetrakis (hydroxymethyl)-phosphonium salt to introduce allyl groups into the cellulosic component, and subsequently halogenating, preferably brominating, the allyl groups thus introduced.
Inventors
- 👤 B Aycock
- 👤 G Tesoro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:52
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/43; D06M15/431; D06M13/00; D06M13/322; D06M13/402; D06M13/432; Y; Y10; Y10S; Y10S8/00; Y10S8/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
17 words
The process of claim 1 wherein the allylurea and phosphine/formaldehyde condensate are used together in physical admixture.
Claim 2
Dependent Claim
17 words
The process of claim 1 wherein the allylurea and phosphine/formaldehyde condensate are used together in precondensate form.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the allylurea is allylurea itself.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein the allylurea is N,N-diallylurea, N,N''-diallylurea, triallylurea, N-allyl-N-methylurea, N-allyl-N''-methylurea, N-allyl-N''-etHylurea or N-allylethyleneurea.
Claim 5
Dependent Claim
12 words
The process of claim 1 wherein the phosphine/formaldehyde condensate is tetrakis(hydroxymethyl)phosphonium chloride.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the textile is treated with a 1:1 precondensate of allylurea and tetrakis(hydroxymethyl)phosphonium chloride.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the textile comprises a cellulosic/polyester blend.
Claim 8
Dependent Claim
20 words
The process of claim 1 wherein the textile comprises a blend of cellulosic fiber and a different nitrogen-free thermoplastic fiber.
Claim 9
Dependent Claim
10 words
The process of claim 1 wherein the halogenating is brominating.
Claim 10
Dependent Claim
33 words
The process of claim 1 wherein the textile is treated with the allylurea and phosphine/formaldehyde condensate by padding with an aqueous solution containing the allylurea and the condensate, followed by drying and curing.
Claim 11
Dependent Claim
15 words
The process of claim 11 wherein curing is carried out in the presence of ammonia.
Claim 12
Dependent Claim
12 words
The process of claim 11 wherein the textile is washed after curing.
Claim 13
Dependent Claim
17 words
The process of claim 11 wherein the aqueous solution has a pH of at least about 5.
Claim 14
Dependent Claim
9 words
The textile obtained by the process of claim 1.
References Cited (Backward Citations)
US2983623A
Cited
US3374292A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |