US3860439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant process for cellulosics
Assignee: Occidental Chemical Corp
•
Filing: 1973-08-06
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Granted: 1975-01-14
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Expires: 1993-08-06
Abstract
Abstract A process for imparting durable flame retardance to cellulose containing materials have been devised whereby materials which have been impregnated with a solution having a pH of from about 7 to about 9 and a tetrakis(hydroxymethyl) phosphonium hydroxide content of from about 10 to about 40 percent by weight and dried to a moisture content of from about 0 to about 8 percent, are aerated by blowing air through the dried material prior to polymerizing the monomer on and in the cellulose materials by exposure in an enclosed chamber to a atmosphere containing gaseous ammonia and thereafter contacting the material with water, as by a fine water spray, as it leaves the ammonia chamber. The monomer is rapidly and effectively polymerized on and in the cellulose containing materials thereby imparting flame retardance having improved durability to laundering to the materials in a rapid and efficient manner which is readily adaptable to high speed commercial textile processing machinery.
Inventors
- 👤 George M Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:48
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/667; D06M13/00; D06M13/244; D06M13/282; D06M13/322; D06M13/46; D06M15/673; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
13 words
A PROCESS FOR IMPARTING FLAME RETARDANT CHARACTER TO CELLULOSE CONTAINING MATERIAL WHICH COMPRISES
Claim 2
Dependent Claim
13 words
A PROCESS FOR IMPARTING FLAME RETARDANT CHARACTER TO CELLULOSE CONTAINING MATERIAL WHICH COMPRISES
Claim 3
Dependent Claim
34 words
IMPREGNATING A CELLULOSE-CONTAINING MATERIAL WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 9 AND CONTAINING FROM ABOUT 10 TO ABOUT 40 PERCENT BY WEIGHT OF TETRAKIS(HYDROXYMETHYL) PHOSPHONIUM HYDROXIDE COMPOUND;
Claim 4
Dependent Claim
34 words
IMPREGNATING A CELLULOSE-CONTAINING MATERIAL WITH AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 7 TO ABOUT 9 AND CONTAINING FROM ABOUT 10 TO ABOUT 40 PERCENT BY WEIGHT OF TETRAKIS(HYDROXYMETHYL) PHOSPHONIUM HYDROXIDE COMPOUND;
Claim 5
Dependent Claim
14 words
DRYING THE THUS IMPREGNATED MATERIAL TO ABOUT 0 TO ABOUT 8 PERCENT MOISTURE RETENTION;
Claim 6
Dependent Claim
14 words
DRYING THE THUS IMPREGNATED MATERIAL TO ABOUT 0 TO ABOUT 8 PERCENT MOISTURE RETENTION;
Claim 7
Dependent Claim
14 words
drying the thus impregnated material to about 0 to about 8 percent moisture retention;
Claim 8
Dependent Claim
14 words
drying the thus impregnated material to about 0 to about 8 percent moisture retention;
Claim 9
Dependent Claim
23 words
The process of claim 1 wherin the impregnated material is dried to from about 0 to percent to about 3 percent moisture retention.
Claim 10
Dependent Claim
36 words
The process of claim 1 wherein the dried material is exposed to an atmosphere containing from about 70 to about 95 percent ammonia by volume in an enclosed chamber for about 15 to about 30 seconds.
Claim 11
Dependent Claim
11 words
aerating the dried impregnated material by passing air through said material;
Claim 12
Dependent Claim
11 words
aerating the dried impregnated material by passing air through said material;
Claim 13
Dependent Claim
11 words
AERATING THE DRIED IMPREGNATED MATERIAL BY PASSING AIR THROUGH SAID MATERIAL;
Claim 14
Dependent Claim
11 words
AERATING THE DRIED IMPREGNATED MATERIAL BY PASSING AIR THROUGH SAID MATERIAL;
Claim 15
Dependent Claim
47 words
EXPOSING SAID MATERIAL TO AN ATMOSPHERE CONTAINING AT LEAST ABOUT 50 PERCENT BY VOLUME OF GASEOUS AMMONIA IN AN ENCLOSED CHAMBER FOR A PERIOD OF FROM ABOUT 5 TO LESS THAN ABOUT 45 SECONDS TO POLYMERIZE THE PHOSPHONIUM COMPOUND IN AND ON THE CELLULOSE CONTAINING MATERIAL, AND
Claim 16
Dependent Claim
47 words
EXPOSING SAID MATERIAL TO AN ATMOSPHERE CONTAINING AT LEAST ABOUT 50 PERCENT BY VOLUME OF GASEOUS AMMONIA IN AN ENCLOSED CHAMBER FOR A PERIOD OF FROM ABOUT 5 TO LESS THAN ABOUT 45 SECONDS TO POLYMERIZE THE PHOSPHONIUM COMPOUND IN AND ON THE CELLULOSE CONTAINING MATERIAL, AND
Claim 17
Dependent Claim
48 words
exposing said aerated material to an atmosphere containing at least about 50 percent by volume of gaseous ammonia in an enclosed chamber for a period of from about 5 to less than about 45 seconds to polymerize the phosphonium compound in and on the cellulose containing material, and
Claim 18
Dependent Claim
48 words
exposing said aerated material to an atmosphere containing at least about 50 percent by volume of gaseous ammonia in an enclosed chamber for a period of from about 5 to less than about 45 seconds to polymerize the phosphonium compound in and on the cellulose containing material, and
Claim 19
Dependent Claim
21 words
The process of claim 1 wherein the air stream used in said aeration step is moved by suction through the material.
Claim 20
Dependent Claim
23 words
The process of claim 1 wherein the air stream used in said aeration step is moved by blowing the air through said material.
Claim 21
Dependent Claim
33 words
contacting the material exiting from said enclosed chamber with water in an amount sufficient to provide a pick-up of water by the material of from about 10 to about 40 percent by weight.
Claim 22
Dependent Claim
33 words
contacting the material exiting from said enclosed chamber with water in an amount sufficient to provide a pick-up of water by the material of from about 10 to about 40 percent by weight.
Claim 23
Dependent Claim
33 words
CONTACTING THE MATERIAL EXITING FROM SAID ENCLOSED CHAMBER WITH WATER IN AN AMOUNT SUFFICIENT TO PROVIDE A PICKUP OF WATER BY THE MATERIAL OF FROM ABOUT 10 TO ABOUT 40 PERCENT BY WEIGHT.
Claim 24
Dependent Claim
33 words
CONTACTING THE MATERIAL EXITING FROM SAID ENCLOSED CHAMBER WITH WATER IN AN AMOUNT SUFFICIENT TO PROVIDE A PICKUP OF WATER BY THE MATERIAL OF FROM ABOUT 10 TO ABOUT 40 PERCENT BY WEIGHT.
Claim 25
Dependent Claim
24 words
The process of claim 1 wherein the water used to contact the material after exiting from said enclosed chamber is a fine water spray.
Claim 26
Dependent Claim
25 words
The process of claim 6 wherein the water used to contact the material after exiting from said enclosed chamber is an air atomized water spray.
Claim 27
Dependent Claim
30 words
The process of claim 7 wherein the material is contacted with suffcient water to result in a pick-up of from about 20 to about 30 percent by weight of water.
Claim 28
Dependent Claim
15 words
The process of claim 1 wherein the cellulose containing material is a cotton textile material.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |