US4038451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compositions comprising polyalkylenepolyamines and a mixture of mono- and diammonium phosphates as fire retardants for cellulosic substrates
Assignee: Dow Chemical Co
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Filing: 1975-09-29
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Granted: 1977-07-26
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Expires: 1995-09-29
Abstract
Abstract Cellulosic substrates, e.g. wood, textiles or paper, have increased fire resistance when treated with an aqueous solution of a polyalkylenepolyamine (e.g. polyethylenimine) and a mixture of mono- and diammonium phosphate.
Inventors
- 👤 Frederick L. Brown
- 👤 James L. Potter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:59
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; C; C08; C08L; C08L97/00; C08L97/02; C09; C09K; C09K21/00; C09K21/14; D06; D06M; D06M11/00; D06M11/68; D06M11/70; D06M11/71; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/54; D21H17/56; D21H5/00; D21H5/0002; B; B27; B27K; B27K2240/00; B27K2240/30; B27K3/00; B27K3/02; B27K3/0278; B27K3/15; B27K3/153; B27K3/34; B27K3/52; B27K5/00; B27K5/04; C08L79/00; C08L79/02; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/4935; Y10T428/662; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2672; Y10T442/268
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
26 words
A composition comprising a polyalkylenepolyamine having a number average molecular weight between about 1,000 and about 100,000 and a mixture of monoammonium phosphate and diammonium phosphate.
Claim 2
Dependent Claim
26 words
A composition comprising a polyalkylenepolyamine having a number average molecular weight between about 1,000 and about 100,000 and a mixture of monoammonium phosphate and diammonium phosphate.
Claim 3
Dependent Claim
13 words
The composition defined by claim 1 wherein the polyalkylenepolyamine is polyethylenepolyamine or polyethylenimine.
Claim 4
Dependent Claim
31 words
The composition defined by claim 1 in which the mixture of monoammonium phosphate and diammonium phosphate consist of from 20 to 80 percent monoammonium phosphate with the remainder being diammonium phosphate.
Claim 5
Dependent Claim
35 words
The composition defined by claim 3 wherein the mixture of mono- to diammonium phosphate consists of from about 35 to about 45 weight percent of the monoammonium phosphate with the remainder being the diammonium phosphate.
Claim 6
Dependent Claim
39 words
The composition defined by claim 4 wherein said mixture consists of 40 percent monoammonium phosphate and 60 percent diammonium phosphate and wherein said polyalkylenepolyamine is a polyethylenimine having an average molecular weight of from about 40,000 to about 60,000.
Claim 7
Dependent Claim
8 words
Wood containing the composition described by claim 1.
Claim 8
Dependent Claim
10 words
A cellulosic textile containing the composition described by claim 1.
Claim 9
Dependent Claim
9 words
A paper containing the composition described by claim 1.
Claim 10
Dependent Claim
11 words
Wood or paper pulp containing the composition defined by claim 1.
Claim 11
Dependent Claim
41 words
A method of imparting fire retardancy to a cellulosic article comprising contacting said cellulosic article with an aqueous solution of the composition defined by claim 1 and thereafter drying the cellulosic article at an elevated temperature to remove the aqueous solvent.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |