US3923960A
Expired / Lapsed
US
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Compositions containing dithionites
Assignee: Individual
•
Filing: 1973-09-10
•
Granted: 1975-12-02
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Expires: 1993-09-10
Abstract
Abstract An anhydrous dithionite composition is rendered resistant to ignition by including in it as a stabiliser a carboxylic acid salt of a primary, secondary or tertiary amine having at least one hydrocarbon group of at least five carbon atoms.
Inventors
- 👤 Roland Albert Leigh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:14
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/64; C01B17/66; C01B17/665
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
43 words
A STABILIZED SUBSTANTIALLY ANHYDROUS DITHIONITE COMPOSITION COMPRISING A MAJOR PROPORTION OF A METALLIC DITHIONITE AND AS A STABILISER A CARBOXYLIC ACID SALT OF A PRIMARY, SECONDARY OR TERTIARY AMINE, WHICH AMINE HAS AT LEAST ONE HYDROCARBOND GROUP OF AT LEAST 5 CARBON ATOMS.
Claim 2
Dependent Claim
43 words
A STABILIZED SUBSTANTIALLY ANHYDROUS DITHIONITE COMPOSITION COMPRISING A MAJOR PROPORTION OF A METALLIC DITHIONITE AND AS A STABILISER A CARBOXYLIC ACID SALT OF A PRIMARY, SECONDARY OR TERTIARY AMINE, WHICH AMINE HAS AT LEAST ONE HYDROCARBOND GROUP OF AT LEAST 5 CARBON ATOMS.
Claim 3
Dependent Claim
20 words
A composition as claimed in claim 1, wherein the dithionite is sodium dithionite, potassium dithionite, calcium dithionite or zinc dithionite.
Claim 4
Dependent Claim
20 words
A composition as claimed in claim 1 wherein the amine is an alkyl amine, an aryl-, alkyaryl- or aralkyl amine.
Claim 5
Dependent Claim
17 words
A composition as claimed in claim 1 wherein the amine is an aryl-, alkyaryl- or aralkyl amine.
Claim 6
Dependent Claim
18 words
A composition as claimed in claim 1 wherein the amine includes mixed alkyl, aryl, aralkyl and/or aralkyl groups.
Claim 7
Dependent Claim
143 words
A composition as claimed in claim 1 wherein the amine is an amyl amine, cyclohexylamine, 1,3-dimethylbutylamine, hexylamine, 2-aminoheptane, 2-amino-4-methylhexane, 1,4-dimethylpentylamine, heptylamine, 2-ethylhexylamine, octylamine, 1-cyclopentyl - 2 -aminopropane, 1,1, 3,3 - tetramethyl-butylamine, decylamine, dodecylamine, tetradecylamine coco, tallow, hydrogenated tallow amine, cetylamine, stearylamine, docosylamine, cottonseed amine, oleylamine, linoleylamine, laurylamine, pamitoleylamine, margarylamine, a diamylamine, didodecylamine, ditetradecylamine, dihexadecylamine, dioctadecylamine, dicoco amine, di-hydrogenated tallow amine, di (octadecenyloctadecadienyl) amine, di (eicosyl-docosy) amine, dicyclohexylamine, bis (1,3 - dimethylbutyl) amine, bis (2 - ethyl-hexyl) amine, bis (1 - ethyl - 3-methylpentyl) amine, propylaurylamine, methyloleylamine, methyloctylamine, dioctylamine, distearylamine, a triamylamine, dimethyloctylamine, dimethylaurylamine, dimethylstearylamine, dimethyldocosylamine, trioctylamine, tridodecylamine, tricoco amine, isooctyldicoco amine, trihydrogenated tallow amine, N -metyl - di-hydrogenated tallow amine, N,N,-dimethylhexadecylamine, N,N,-dimethyloctadecylamine, N,N,-dimethylcoco amine, N,N,-dimethyl (octadecenyl - octadecadienyl) amine, N,N - dimethyl hydrogenated tallow amine, N-octyl ethylenediamine, N-stearylpropylene diamine, N-octadecenyl trimethylenediamine, N-coco-trimethylenediamine, N-tallow-trimethylenediamine, N- (octadecenyl - octadecadienyl) trimethylenediamine, or an alkyl propylene diamine.
Claim 8
Dependent Claim
18 words
A composition as claimed in claim 1, wherein the amine gives rise to solid, water soluble carboxylate salts.
Claim 9
Dependent Claim
18 words
A composition as claimed in claim 7, wherein the amine is coco, an alkyl palmitoleyl or tallow amine.
Claim 10
Dependent Claim
15 words
A composition as claimed in claim 1, wherein the carboxylic acid is an aliphatic acid.
Claim 11
Dependent Claim
20 words
A composition as claimed in claim 1, wherein the carboxylic acid is phthalic, may be naphthenic, naphthic or acenaphtic acid.
Claim 12
Dependent Claim
22 words
A composition as claimed in claim 1, wherein the carboxylic acid is acetic, propionic, butyric, pentanoic, succinic, glutaric, adipic or oleic acid.
Claim 13
Dependent Claim
21 words
A composition as claimed in claim 1, wherein the quantity of stabiliser is within the range 0.02 to 10% by weight.
Claim 14
Dependent Claim
19 words
A composition as claimed in claim 1 wherein the quantity of stabiliser is in the range 0.5, to 3%.
Claim 15
Dependent Claim
18 words
A composition claimed in claim 12 wherein the quantity of stabiliser is in the range 1 to 2%.
Claim 16
Dependent Claim
21 words
A composition as claimed in claim 1 wherein the quantity of dithionite is at least 90% of the composition by weight.
Claim 17
Dependent Claim
12 words
A composition as claimed in claim 1, including a free flowing agent.
Claim 18
Independent Claim
41 words
A method of forming a stabilised substantially anhydrous metallic dithionite composition which comprises intimately mixing the dithionite with a carboxylic acid salt of a primary, secondary or tertiary amine having at least one hydrocarbon group of at least 5 carbon atoms.
Claim 19
Independent Claim
41 words
A method of forming a stabilised substantially anhydrous metallic dithionite composition which comprises intimately mixing the dithionite with a carboxylic acid salt of a primary, secondary or tertiary amine having at least one hydrocarbon group of at least 5 carbon atoms.
Claim 20
Dependent Claim
23 words
A method as claimed in claim 17 wherein the salt to be mixed with the dithionite is in the form of a melt.
Claim 21
Dependent Claim
25 words
A method as claimed in claim 17 whereiN the dithionite is in solution in an organic solvent which is removed when the mixing is complete.
Claim 22
Independent Claim
55 words
A method of forming a stabilised substantially anhydrous dithionite composition which comprises adding to the reaction mixture for forming the dithionite a carboxylic acid salt of a primary, secondary or tertiary amine having at least one hydrocarbon group of at least 5 carbon atoms, the salt being added during the last stages of dithionite manufacture.
Claim 23
Independent Claim
55 words
A method of forming a stabilised substantially anhydrous dithionite composition which comprises adding to the reaction mixture for forming the dithionite a carboxylic acid salt of a primary, secondary or tertiary amine having at least one hydrocarbon group of at least 5 carbon atoms, the salt being added during the last stages of dithionite manufacture.
Claim 24
Dependent Claim
31 words
A method as claimed in claim 20, wherein an alcoholic filter cake of the dithionite is mixed with an alcoholic solution of the salt prior to drying of the filter cake.
Claim 25
Dependent Claim
27 words
A method as claimed in claim 20, wherein the salt is dissolved or dispersed in a solution or slurry of the dithionite prior to evaporation to dryness.
References Cited (Backward Citations)
US2525770A
Cited
US3666409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |