US4265945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Quaternary ureidomethyl phosphonium salts
Assignee: United States Department of Agriculture
•
Filing: 1979-11-29
•
Granted: 1981-05-05
•
Expires: 1999-11-29
Abstract
Abstract Novel quaternary ureidomethyl phosphonium salts having the general formula <IMAGE> are prepared by condensing a urea having the formula RNHC(O)NR'R'' with a quaternary hydroxymethyl phosphonium salt having the formula (HOCH2)4P+X-in a molar ratio of at least 2:1. The products, which are characterized by the absence of residual hydroxymethyl groups, are useful as finishing agents for imparting flame retardant properties to cotton fabrics.
Inventors
- 👤 Arlen W. Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:21
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/667; D06M15/673; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5407; C07F9/547; C07F9/6564; C07F9/6568; C07F9/65688; C07F9/6581; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2843
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
68 words
A process for imparting flame-retardant character to a cellulosic textile comprising: (a) impregnating the cellulosic textile with an approximately 1:1 molar mixture of octakis(ureidomethyl)diphosphonium sulfate and octakis(hydroxymethyl)diphosphonium sulfate in water; (b) squeezing the impregnated textile to about 100% wet pick-up; (c) curing the impregnated textile for about 10 minutes at about 100° C.; and (d) rinsing the cured cellulosic textile in hot water to remove the unreacted chemicals.
Claim 2
Dependent Claim
68 words
A process for imparting flame-retardant character to a cellulosic textile comprising: (a) impregnating the cellulosic textile with an approximately 1:1 molar mixture of octakis(ureidomethyl)diphosphonium sulfate and octakis(hydroxymethyl)diphosphonium sulfate in water; (b) squeezing the impregnated textile to about 100% wet pick-up; (c) curing the impregnated textile for about 10 minutes at about 100° C.; and (d) rinsing the cured cellulosic textile in hot water to remove the unreacted chemicals.
Claim 3
Dependent Claim
70 words
A process for imparting flame-retardant character to a cellulosic textile, comprising: (a) impregnating the cellulosic textile with an approximately 4:1 molar mixture of urea and octakis(hydroxymethyl)diphosphonium sulfate in water; (b) squeezing the impregnated cellulosic textile to about a 100% wet pick-up; (c) curing the impregnated cellulosic textile for about 30 minutes at about 100° C.; and (d) rinsing the cured cellulosic textile in hot water to remove the unreacted chemicals.
Claim 4
Dependent Claim
70 words
A process for imparting flame-retardant character to a cellulosic textile, comprising: (a) impregnating the cellulosic textile with an approximately 4:1 molar mixture of urea and octakis(hydroxymethyl)diphosphonium sulfate in water; (b) squeezing the impregnated cellulosic textile to about a 100% wet pick-up; (c) curing the impregnated cellulosic textile for about 30 minutes at about 100° C.; and (d) rinsing the cured cellulosic textile in hot water to remove the unreacted chemicals.
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |