US3342749A - Corrosion inhibited phosphate solutions - Google Patents

Corrosion inhibited phosphate solutions Download PDF

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Publication number
US3342749A
US3342749A US372102A US37210264A US3342749A US 3342749 A US3342749 A US 3342749A US 372102 A US372102 A US 372102A US 37210264 A US37210264 A US 37210264A US 3342749 A US3342749 A US 3342749A
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United States
Prior art keywords
thiosulfate
corrosion
mercaptobenzothiazole
copper
weight percent
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US372102A
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English (en)
Inventor
Avrom R Handleman
Robert P Langguth
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Monsanto Co
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Monsanto Co
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Publication date
Application filed by Monsanto Co filed Critical Monsanto Co
Priority to US372102A priority Critical patent/US3342749A/en
Priority to ES0313530A priority patent/ES313530A1/es
Priority to NO158296A priority patent/NO117957B/no
Priority to FR19298A priority patent/FR1444322A/fr
Application granted granted Critical
Publication of US3342749A publication Critical patent/US3342749A/en
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D1/00—Fire-extinguishing compositions; Use of chemical substances in extinguishing fires
    • A62D1/0028—Liquid extinguishing substances
    • A62D1/0035—Aqueous solutions
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/28—Ammonium phosphates
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B25/00—Phosphorus; Compounds thereof
    • C01B25/16—Oxyacids of phosphorus; Salts thereof
    • C01B25/26—Phosphates
    • C01B25/38—Condensed phosphates
    • C01B25/40—Polyphosphates
    • C01B25/405—Polyphosphates of ammonium

Definitions

  • This invention relates to improved aqueous solutions of phosphate salts, which solutions are characterized by having a significantly reduced tendency to corrode copper metal and copper containing alloys. More specifically, the present invention relates to corrosion-inhibited ammonium phosphate solutions suitable for prolonged use in handling and storage equipment made of copper and/ or copper alloys and to the compositions useful for manufacturing them.
  • Aqueous ammonium phosphate solutions have many uses: One of the most valuable recent developments in the field of fire fighting, and more particularly, forest, brush, and grass fire fighting, was that relating to the use of aqueous solutions of ammonium phosphate salts. Since the present invention is particularly valuable when practiced in connection with forest and brush fire fighting, the present discussion will be directed toward this particular end use. However, it should be kept in mind that the invention is generally useful for inhibiting corrosion of copper by ammonium phosphate solutions.
  • the solutions are dropped by airplane such as air-tankers onto brush, trees and dry grass in the path of a fire in order to slow or stop the progress of the fire.
  • airplane such as air-tankers onto brush, trees and dry grass in the path of a fire in order to slow or stop the progress of the fire.
  • ammonium phosphate solutions for forest fire control has been slowed because of the concern by those in the field over the natural corrosivity of such aqueous ammonium phosphate solutions toward some of the vital parts of airtankers and storage equipment.
  • Aqueous solutions containing several weight percent of dissolved ammonium phosphate are considered to be corrosive toward copper metal or copper alloys such as brass and bronze and the like, and are corrosive to an extent suificient to cause great concern when the aqueous solutions are to come into physical contact with vital aircraft parts, since failure of the aircraft parts due even to slow corrosion (i.e., more than about 10 mils per year) occurring over a prolonged period of time could result in the loss of the aircraft and crew.
  • inorganic water-soluble thiosulfate is intended to include all of those inorganic thiosulfate materials or compounds that are soluble in distilled water at a temperature of 25 C. to the extent of at least about 0.005 weight percent. It includes, for example, the alkali metal and alkaline earth metal iodides such as sodium, potassium, lithium, rubidium, cesium, calcium, magnesium, barium, barylliurn, and strontium, thiosulfates as well as ammonium thiosulfate. Of these, generally sodium, potassium and/or ammonium thiosulfates are preferred.
  • the protection from corrosion that can be afforded copper equipment by practicing the present invention apparently results from the thiosulfate (anion) portion of the inorganic thiosulfate compound, the particular source from which the thiosulfate anions are derived in manufacturing the aqueous ammonium phosphate solutions is not at all critical, provided a sufficient amount of thiosulfate anions are provided in the phosphate solutions to effectively decrease the normal corrosivity of the phosphate solutions toward copper and copper-containing alloys.
  • this term encompasses alkali metal (such as Na, K, Rb, Cs, Li), alkaline earth metal (such as Mg, Ca, Be, Sr), soluble amine salts (such as methylamine, ethylamine and t-butylamine), and many other salts.
  • Z-mercaptobenzothiazole is ordinarily considered to be insoluble in most aqueous systems having pHs below about 10, apparently enough of the Z-mercaptobenzothiazoles is soluble in the preferred aqueous ammonium orthophosphate solutions of the present invention to perform well as a copper corrosion inhibitor when used in combination with one or more of the abovedescribed soluble inorganic thiosulfate compounds.
  • the inhibitor combinations of the present invention perform well even in very dilute ammonium phosphate solutions, since corrosion is often induced or caused by such solutions by a concentration effect resulting from splashing upon copper surfaces and subsequent evaporation of the water from the aqueous solution.
  • the ammonium phosphate solutions in which the inhibitor combinations of the present invention perform particularly effectively are those that contain at least about 0.5 weight percent, and up to the level at about which the solutions are saturated therewith, or even more (such as in the form of an aqueous slurry) of dissolved ammonium phosphate salts, including monoammonium dibydrogen orthophosphate and/ or diammonium monohydrogen orthophosphate salts, and mixtures thereof, and also including the diammonium and monoammonium mixed orthophosphate salts that also contain an alkali metal cation, such as monoammonium disodium orthophosphate, monoammonium dipotassium orthophosphate and the like, no matter from What source these materials were derived, or in what form the mate
  • the inhibited aqueous phosphate solutions of this invention have a pH above about 7, and preferably between about 7.2 and about 11, but can be even higher without detrimentally effecting the desired corrosion protection afforded by the present invention.
  • the preferred pH is from about 7.2 to about 10.
  • pHs within these preferred ranges are generally more desirable.
  • compositions having pHs somewhat higher or lower than these preferred ranges can also be utilized to advantage in the practice of the present invention.
  • aqueous ammonium phosphate compositions containing at least about 0.0075 and preferably from about 0.01 to about 5 weight percent of one or more of the thiosulfate compounds in the dissolved state should be utilized.
  • aqueous ammonium phosphate compositions containing at least about 0.0075 and preferably from about 0.01 to about 5 weight percent of one or more of the thiosulfate compounds in the dissolved state should be utilized.
  • Generally optimum corrosion-inhibiting effects can be attained by utilizing at least about 0.02 weight percent of the thiosulfate compound in combination with at least about 001 Weight percent of one of the aforementioned Z-mercaptobenzothiazole materials.
  • the weight ratio of ammonium orthophosphate salt(s) to inorganic thiosulfate salt(s) in the compoistions of the present invention ordinarily falls within the range of from about 350021 to about 01:1, and is preferably within the range of from about 250021 to about 1:1.
  • the weight ratio of ammonium orthophosphate salt(s) to 2- mercaptobenzothiazole in the compositions of this invention ordinarily falls Within the range of from about 250021 to about 2.5:1.
  • the weight ratio of total ammonium orthophosphate salt(s) to thiosulfate ions in the composition and the weight ratio of thiosulfate ions to 2-mercaptobenzothiazole can readily be determined.
  • the weight ratio of ammonium orthophosphate to thiosulfate ions is between about 3500:1 and about 1.5: 1, while the weight ratio of thiosulfate ions to Z-mercaptobenzothiazole in the aqueous compositions of this invention is preferably between about 300:1 and about 0.0035: 1.
  • a surprising feature of the present invention is that the corrosion inhibitor combination (soluble thiosulfate plus Z-mercaptobenzothiazole) acts synergistically in the protection of the copper from corrosion by the ammonium orthophosphate solutions.
  • soluble thiosulfate compounds when soluble thiosulfate compounds are utilized alone (as the only inhibitor for copper) in a 10 Weight percent aqueous solution of diammonium orthophosphate, for example, the best protection that can be afforded the copper even when very large amounts of thiosulfate is used, is down to about 15 mils per year (as compared with a no inhibitor control corrosion rate of about 1000 mils per year).
  • the corrosion-inhibited ammonium phosphate solutions of the present invention can also contain materials other than the phosphate salts and the thiosulfate and 2-mercaptobenzothiazole compounds without detracting substantially from the benefits that can be obtained by practicing this invention.
  • the solutions can contain minor amounts of water-soluble surfactants; inorganic and organic complexing agents such as the alkali metal tripolyphosphate, pyrophosphates and trimetaphosphates, as well as the higher polyphosphates such as the hexametaphosphates, and also can contain ethylenediamine tetraacetic acid and various alkali metal and ammonium salts thereof and the alkali metal and ammonium nitrilotriacetates; any of the various sticking agents such as carboxymethylcellulose or thickening agents such as algin, citrus pectates, clays such as bentonites and attapulgites, and the like, guar gum and carboxyethylcellulose; other corrosion-inhibiting ingredients such as the water-soluble fiuosilicates for protecting aluminum in accordance with the disclosure in US. Patent Re. 25,394; and inorganic and organic pigments and dyes; as well as many other materials.
  • inorganic and organic complexing agents such as the al
  • the corrosion-inhibited phosphate compositions of this invention can be manufactured via any of a number of methods without any noticeably detrimental effects upon the ultimate performance of the compositions.
  • the thiosulfate and Z-mercaptobenzothiazole compounds can simply be dissolved by intermixing them into or with the otherwise completely formulated aqueous compositions, or at any other stage during the preparation of the fire-control compositions.
  • the thiosulfate and/ or the 2-mercaptobenzothiazole compound can first be dissolved in water, and the resulting solution then intermixed subsequently with the ammonium phosphate materials.
  • Still another process for manufacturing the aqueous corrosion inhibited phosphate compositions described heretofore involves one of the preferred embodiments of the present invention.
  • This preferred embodiment comprises a concentrate mixture of one or more of the ammonium phosphate salts described heretofore with one ents, including a thickenerif one is desired in--the final firecontrol compositions, as well as dyes, pigments, watersoftening agents, and the like, all of which should preferably be present in the concentrate compositions in minor amounts, as compared to the ammonium phosphate salt(s) contained therein.
  • Preferred concentrate compositions contain at least about 30 weight percent, and still more preferably, at least about 50 weight percent, of ammonium orthophosphate material, and minor amounts (less than 50 Weight percent), based on the weight of the concentrate composition, of the combination corrosion inhibitor described hereinbefore, thickener, other corrosion inhibitions, and other desired additives.
  • Typical examples of the preferred concentrate compositions of this invention include: (percentages are in terms of weight percent) Wt. percent Diammonium phosphate 90.0 Guar gum 9.0 Sodium thiosulfate .75 Z-mercaptobenzothiazole .25
  • Diammonium phosphate 95 Monoammonium phosphate 4 Sodium thiosulfate 0.5 Z-mercaptobenzothiazole 0.5
  • Diammonium phosphate 80 Sodium tripolyphosphate 10 Sodium alginate 9 Ammonium thiosulfate 0.8 Z-mercaptobenzothiazole sodium salt 0.2
  • Diammonium phosphate 92 Carboxymethyl cellulose 5 Sodium tripolyphosphate 4 Potassium thiosulfate 0.9 Z-mercaptobenzothiazole 0.1
  • Diammonium phosphate Monoammonium phosphate 3 Sodium alginate 10 Sodium thiosulfate 1.7 Z-mercaptobenzothiazole 0.3
  • Diammonium phosphate 45 Triammonium acid pyrophosphate 45 Sodium carboxymethylcellulose 9 Sodium thiosulfate 0.8 Z-mercaptobenzothiazole 0.2
  • concentrate compositions are also useful as corrosion-inhibited de-icer compounds, wherein, either alone or in combination with additional corrosion inhibiting materials, they can be utilized in a manner similar to that in which more corrosive, less desirable, sodium chloride, is presently conventionally utilized.
  • these particulated, solid ammonium phosphate-thiosulfate compounds can effectively de-i'ce aircraft runways, sidewalks, roadways and the like when they are simply spread over ice and/ or snow.
  • the concentrate compositions of this invention can be prepared via any of a number of convenient procedures, including simply blending or mixing together the appropriate amounts of the various dry ingredients.
  • the size of the individual particles in these preferred concentrate compositions is not critical in so far as the practice of the present invention is concerned, it is generally preferred that they be of sufficiently small size to pass through a US. Standard 12 mesh screen. For optimum results, at least about 80 weight percent of these particles should be small enough to pass through a US. Standard 20 mesh screen.
  • commercial grades of phosphate and thiosulfate salts do not necessarily meet these optimum standards of particle size, they can readily be utilized in the preparation of the compositions of this invention.
  • the corrosion rate or rate of attack on copper by the composition of Example I is thus found to be about 0.8 mils per year.
  • Control 940 8.34 parts of water plus 1.2 parts of a pro-pared blend. Numbers correspond to specific preferred concentnate compositions given above.
  • compositions tested are excellent forest and brush-fire retardants.
  • the corrosion inhibited ammonium phosphate compositions of this invention can be dropped on, around or in front of fires burning in practically any cellulosic fuel.
  • they can be dropped or sprayed on wooden or frame structures, or structures that contain cellulosic components close by an actively burning fire in order to protect the coated structure from burning embers, as well as from spontaneous ignition due to excessive heat from the nearby fire.
  • An aqueous copper corrosion inhibited ammonium orthophosphate composition having a pH above about 7 and consisting essentially of, in addition to an ammonium orthophosphate dissolved therein in an amount of at least 0.5 weight percent, (a) a water soluble inorganic thiosulfate in an amount of at least about 00075 weight percent and (b) a 2-mercaptobenzothiazole inhibitor in an amount of at least about 0.0005 weight percent.
  • a copper corrosion-inhibited aqueous ammonium orthophosphate composition having a pH above about 7 and consisting essentially of at least about 0.5 weight percent of an ammonium orthophosphate salt selected from 'the group consisting. of monoammonium dihydrogen orthophosphate, diammonium monohydrogen orthophosphate, and mixtures thereof, from about 0.0075 to about 5 weight percent of a water soluble inorganic thiosulfate, and from about 0.0005 to about 2 weight percent of a 2-mercaptobenzothiazole.
  • composition as in claim 4 wherein the weight ratio of said thiosulfate to said Z-mercaptobenzothiazole in said composition is from about 300:1 to about .0035: 1.
  • a process for decreasing the corrosivity of copper and copper alloys caused by a normally corrosive aqueous solution containing at least one inorganic ammonium 0rthophosphate salt in an amount of at least about 0.5 weight percent comprises effecting the contact of said copper and copper alloys with said solution having dissolved therein (a) a water soluble inorganic thiosulfate salt in an amount of at least about 0.0075 weight percent and (b) a 2-mercaptobenzothiazole in an amount of at least about 0.0005 weight percent.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
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  • Business, Economics & Management (AREA)
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  • Preventing Corrosion Or Incrustation Of Metals (AREA)
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US372102A 1964-06-02 1964-06-02 Corrosion inhibited phosphate solutions Expired - Lifetime US3342749A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US372102A US3342749A (en) 1964-06-02 1964-06-02 Corrosion inhibited phosphate solutions
ES0313530A ES313530A1 (es) 1964-06-02 1965-05-29 Un metodo de hacer una composicion de ortofosfato amonico.
NO158296A NO117957B (enrdf_load_stackoverflow) 1964-06-02 1965-05-31
FR19298A FR1444322A (fr) 1964-06-02 1965-06-02 Composition pour la lutte contre l'incendie, inhibée à la corrosion

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US372102A US3342749A (en) 1964-06-02 1964-06-02 Corrosion inhibited phosphate solutions

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ES (1) ES313530A1 (enrdf_load_stackoverflow)
FR (1) FR1444322A (enrdf_load_stackoverflow)
NO (1) NO117957B (enrdf_load_stackoverflow)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890165A (en) * 1970-04-09 1975-06-17 Fmc Corp Passivation of materials which come into contact with peroxygen compounds
US3959166A (en) * 1974-12-16 1976-05-25 Nalco Chemical Company Cleaner for automotive engine cooling system
EP0277932A1 (en) * 1987-01-30 1988-08-10 Monsanto Company Fire retardant concentrates and methods for preparation thereof
US5156769A (en) * 1990-06-20 1992-10-20 Calgon Corporation Phenyl mercaptotetrazole/tolyltriazole corrosion inhibiting compositions
US5746947A (en) * 1990-06-20 1998-05-05 Calgon Corporation Alkylbenzotriazole compositions and the use thereof as copper and copper alloy corrosion inhibitors
US20020096668A1 (en) * 2000-11-28 2002-07-25 Vandersall Howard L. Fire retardant compositions with reduced aluminum corrosivity
US6447697B1 (en) 1999-03-03 2002-09-10 Astaris, Llc Colorant liquid, method of use, and wildland fire retardant liquids containing same
US20030066990A1 (en) * 2000-11-28 2003-04-10 Vandersall Howard L. Ammonium polyphosphate solutions containing multi-functional phosphonate corrosion inhibitors
US20030204004A1 (en) * 2000-11-28 2003-10-30 Vandersall Howard L. Methods for preparation of biopolymer thickened fire retardant compositions
US6676858B2 (en) 1999-03-03 2004-01-13 Astaris Llc Colorant liquid, method of use, and wildland fire retardant liquids containing same
US6802994B1 (en) 2000-11-28 2004-10-12 Astaris Llc Fire retardant compositions containing ammonium polyphosphate and iron additives for corrosion inhibition
US20110079578A1 (en) * 2009-10-05 2011-04-07 Kesheng Feng Nickel-Chromium Alloy Stripper for Flexible Wiring Boards
WO2022079101A1 (en) * 2020-10-14 2022-04-21 Vt Production Dooel Skopje Fire extinguishing compositions and method of prepration thereof
WO2022132962A1 (en) * 2020-12-15 2022-06-23 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
US11534643B2 (en) 2019-06-07 2022-12-27 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
US11975231B2 (en) 2022-03-31 2024-05-07 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2567157A1 (fr) * 1984-07-05 1986-01-10 Monsanto Co Solutions de sulfate de diammonium a action corrosive inhibee

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US1997669A (en) * 1934-02-23 1935-04-16 Arcieri Antonio Aeroplane attachment for extinguishing fires
US2303399A (en) * 1939-05-01 1942-12-01 Hall Lab Inc Alkaline detergent
US2617713A (en) * 1948-04-15 1952-11-11 Pure Oil Co Method of inhibiting corrosion of steel by alkali solutions
US2901428A (en) * 1953-05-22 1959-08-25 Chem Fab Grunan Ag Fire extinguishing method
US2972581A (en) * 1955-09-21 1961-02-21 Nalco Chemical Co Corrosion inhibitor composition and cooling solution
USRE25394E (en) * 1963-06-11 Corrosion-inhibited liquid fertilizer
US3238136A (en) * 1963-07-01 1966-03-01 Jefferson Chem Co Inc Antifreeze composition

Patent Citations (7)

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USRE25394E (en) * 1963-06-11 Corrosion-inhibited liquid fertilizer
US1997669A (en) * 1934-02-23 1935-04-16 Arcieri Antonio Aeroplane attachment for extinguishing fires
US2303399A (en) * 1939-05-01 1942-12-01 Hall Lab Inc Alkaline detergent
US2617713A (en) * 1948-04-15 1952-11-11 Pure Oil Co Method of inhibiting corrosion of steel by alkali solutions
US2901428A (en) * 1953-05-22 1959-08-25 Chem Fab Grunan Ag Fire extinguishing method
US2972581A (en) * 1955-09-21 1961-02-21 Nalco Chemical Co Corrosion inhibitor composition and cooling solution
US3238136A (en) * 1963-07-01 1966-03-01 Jefferson Chem Co Inc Antifreeze composition

Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890165A (en) * 1970-04-09 1975-06-17 Fmc Corp Passivation of materials which come into contact with peroxygen compounds
US3959166A (en) * 1974-12-16 1976-05-25 Nalco Chemical Company Cleaner for automotive engine cooling system
EP0277932A1 (en) * 1987-01-30 1988-08-10 Monsanto Company Fire retardant concentrates and methods for preparation thereof
US5156769A (en) * 1990-06-20 1992-10-20 Calgon Corporation Phenyl mercaptotetrazole/tolyltriazole corrosion inhibiting compositions
US5746947A (en) * 1990-06-20 1998-05-05 Calgon Corporation Alkylbenzotriazole compositions and the use thereof as copper and copper alloy corrosion inhibitors
US6676858B2 (en) 1999-03-03 2004-01-13 Astaris Llc Colorant liquid, method of use, and wildland fire retardant liquids containing same
US6447697B1 (en) 1999-03-03 2002-09-10 Astaris, Llc Colorant liquid, method of use, and wildland fire retardant liquids containing same
US6517747B2 (en) 1999-03-03 2003-02-11 Astaris, Llc Colorant liquid, method of use, and wildland fire retardant liquids containing same
US20030066990A1 (en) * 2000-11-28 2003-04-10 Vandersall Howard L. Ammonium polyphosphate solutions containing multi-functional phosphonate corrosion inhibitors
US20030204004A1 (en) * 2000-11-28 2003-10-30 Vandersall Howard L. Methods for preparation of biopolymer thickened fire retardant compositions
US20030212177A1 (en) * 2000-11-28 2003-11-13 Vandersall Howard L. Use of biopolymer thickened fire retardant compositions to suppress fires
US20020096668A1 (en) * 2000-11-28 2002-07-25 Vandersall Howard L. Fire retardant compositions with reduced aluminum corrosivity
US6802994B1 (en) 2000-11-28 2004-10-12 Astaris Llc Fire retardant compositions containing ammonium polyphosphate and iron additives for corrosion inhibition
US6828437B2 (en) 2000-11-28 2004-12-07 Astaris, Llc Use of biopolymer thickened fire retardant composition to suppress fires
US6846437B2 (en) 2000-11-28 2005-01-25 Astaris, Llc Ammonium polyphosphate solutions containing multi-functional phosphonate corrosion inhibitors
US6852853B2 (en) 2000-11-28 2005-02-08 Astaris Llc Methods for preparation of biopolymer thickened fire retardant compositions
US6905639B2 (en) 2000-11-28 2005-06-14 Astaris Llc Fire retardant compositions with reduced aluminum corrosivity
TWI460311B (zh) * 2009-10-05 2014-11-11 Macdermid Inc 用於撓性配線基板之鎳－鉻合金剝離劑
US8486281B2 (en) * 2009-10-05 2013-07-16 Kesheng Feng Nickel-chromium alloy stripper for flexible wiring boards
US20110079578A1 (en) * 2009-10-05 2011-04-07 Kesheng Feng Nickel-Chromium Alloy Stripper for Flexible Wiring Boards
CN102666927A (zh) * 2009-10-05 2012-09-12 麦克德米德尖端有限公司 用于挠性配线板的镍-铬合金剥离剂
US11607570B2 (en) 2019-06-07 2023-03-21 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
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US11554280B2 (en) 2019-06-07 2023-01-17 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
WO2022079101A1 (en) * 2020-10-14 2022-04-21 Vt Production Dooel Skopje Fire extinguishing compositions and method of prepration thereof
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US12214236B2 (en) 2020-12-15 2025-02-04 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
US12214237B2 (en) 2020-12-15 2025-02-04 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
EP4263690A4 (en) * 2020-12-15 2024-11-20 FRS Group, LLC Long-term fire retardant with corrosion inhibitors and methods for making and using same
US12109446B2 (en) 2022-03-31 2024-10-08 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
US12053658B2 (en) 2022-03-31 2024-08-06 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same
US11975231B2 (en) 2022-03-31 2024-05-07 Frs Group, Llc Long-term fire retardant with corrosion inhibitors and methods for making and using same

Also Published As

Publication number Publication date
FR1444322A (fr) 1966-07-01
ES313530A1 (es) 1966-02-16
NO117957B (enrdf_load_stackoverflow) 1969-10-13

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