US3903337A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for processing cellulose containing material to impart flame resistance
Assignee: Mitsui Toatsu Chemicals Inc
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Filing: 1974-04-04
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Granted: 1975-09-02
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Expires: 1994-04-04
Abstract
Abstract This invention relates to a new method for imparting flame resistance coupled with excellent resistance to washing to cellulose containing fibrous materials by treatment with a methylene ether bond bearing phosphorus compound.
Inventors
- 👤 Kosuke Yamamoto
- 👤 Masahiro Kono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:13
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/288; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
51 words
A METHOD FOR FLAMEPROOFING CELLULOSE CONTAINING MATERIAL COMPRISING: PROVIDING A SOLUTION CONTAINING A PHOSPHORUS COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA: R1-O-P(=O)(-O-R2)-CH2-CH2-CO-NH-CH2-O-CH2-NH-COCH2-CH2-P(=O)(-O-R3)-O-R4 WHEREIN R1 TO R4 ARE THE SAME OR DIFFERENT ALKYL, ALEKNYL, HALOGENALKYL OR ALKOXYALKYL GROUPS, APPLYING SAID SOLUTION TO THE CELLULOSIC CONTAINING MATERIAL, AND DRYING THE CELLULOSIC CONTAINING MATERIAL.
Claim 2
Independent Claim
51 words
A METHOD FOR FLAMEPROOFING CELLULOSE CONTAINING MATERIAL COMPRISING: PROVIDING A SOLUTION CONTAINING A PHOSPHORUS COMPOUND REPRESENTED BY THE FOLLOWING GENERAL FORMULA: R1-O-P(=O)(-O-R2)-CH2-CH2-CO-NH-CH2-O-CH2-NH-COCH2-CH2-P(=O)(-O-R3)-O-R4 WHEREIN R1 TO R4 ARE THE SAME OR DIFFERENT ALKYL, ALEKNYL, HALOGENALKYL OR ALKOXYALKYL GROUPS, APPLYING SAID SOLUTION TO THE CELLULOSIC CONTAINING MATERIAL, AND DRYING THE CELLULOSIC CONTAINING MATERIAL.
Claim 3
Dependent Claim
23 words
The method of claim 1 wherein R1, R2, R3 and R4 are alkyl or halogenalkyl groups having not more than 4 carbon atoms.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein the phosphorus compound is prepared by condensing a phosphonopropionamide with paraformaldehyde in the presence of an acid catalyst.
Claim 5
Dependent Claim
15 words
The method of claim 2 wherein R1, R2, R3 and R4 are all methyl groups.
Claim 6
Dependent Claim
15 words
The method of claim 2 wherein R1, R2, R3 and R4 are all isopropyl groups.
Claim 7
Dependent Claim
15 words
The method of claim 2 wherein R1, R2, R3 and R4 are all chloroethyl groups.
Claim 8
Dependent Claim
48 words
The method of claim 1 wherein the material is applied in the form of an aqueous solution containing 5-80 percent by weight of said compounds to wet the material and wherein the wetted material is dried and cured at a temperature within the range of 120* to 200*C.
References Cited (Backward Citations)
US3374292A
Cited
US3381063A
Cited
US3381062A
Cited
US3577270A
Cited
US3700403A
Cited
US3679778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |