US4078101A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flameproofing of textiles
Assignee: Solvay Solutions UK Ltd
•
Filing: 1975-12-11
•
Granted: 1978-03-07
•
Expires: 1995-12-11
Abstract
Abstract A process for flameproofing cellulosic textile fibres which comprises impregnating the fabric with an aqueous solution containing a pre-condensate of urea and a THP salt together with any excess of the THP salt necessary to make up a ratio of urea to THP lying between 0.05:1 and 0.25:1 molar, the solution being neutralized by the addition of an alkali or base to a pH in the range 5 to 8, and treating the impregnated fibres with ammonia to form a cross-linked polymer.
Inventors
- 👤 Robert Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:21
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/667; D06M15/673; C; C09; C09K; C09K21/00; C09K21/06; C09K21/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A process for flameproofing cellulosic textile fabric which comprises impregnating the fabric with an aqueous solution containing a pre-condensate of urea and a tetrakis hydroxymethyl phosphonium salt together with any excess of the tetrakis hydroxymethyl phosphonium salt necessary to make up a ratio of urea to tetrakis hydroxymethyl phosphonium lying between 0.05:1 and 0.25:1 molar, the solution being neutralised by the addition of an alkali or base to a pH in the range 5 to 8, and treating the impregnated fibres with ammonia to form a cross-linked polymer.
Claim 2
Dependent Claim
88 words
A process for flameproofing cellulosic textile fabric which comprises impregnating the fabric with an aqueous solution containing a pre-condensate of urea and a tetrakis hydroxymethyl phosphonium salt together with any excess of the tetrakis hydroxymethyl phosphonium salt necessary to make up a ratio of urea to tetrakis hydroxymethyl phosphonium lying between 0.05:1 and 0.25:1 molar, the solution being neutralised by the addition of an alkali or base to a pH in the range 5 to 8, and treating the impregnated fibres with ammonia to form a cross-linked polymer.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1 in which the tetrakis hydroxymethyl phosphonium salt is the chloride.
Claim 4
Dependent Claim
19 words
A process as claimed in clain 2 in which the pH of the solution lies between 5.8 and 7.
Claim 5
Dependent Claim
19 words
A process as claimed in claim 1 in which the pH of the solution lies between 5.8 and 7.
References Cited (Backward Citations)
US2983623A
Cited
GB938989A
Cited
US3236676A
Cited
US3276897A
Cited
US3775155A
Cited
US3784356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |