US3984448A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of dialkylthiophosphates
Assignee: Hoechst AG
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Filing: 1974-12-13
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Granted: 1976-10-05
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Expires: 1994-12-13
Abstract
Abstract Production of dialkylthiophosphates of the general formula: ##EQU1## IN WHICH R 1 and R 2 stand for identical or different linear and/or branched alkyl radicals having from 1 to 6 carbon atoms, M stands for a metal cation and n stands for the valence of the metal cation concerned, wherein O,O-dialkylphosphites of the general formula: ##EQU2## in which R 1 and R 2 have the meanings given above, are reacted with a compound yielding the metal cation M, in the presence of pulverulent sulfur and organic solvents at elevated temperature, More particularly, high-grade and very pure dialkylthiophosphates are produced by using, as the compound yielding the metal cation M, the oxide of the corresponding mono- to tetravalent metal.
Inventors
- 👤 Bernhard Lippsmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:44
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/16; C07F9/165; C07F9/17; C10; C10M; C10M2223/00; C10M2223/02; C10M2223/04; C10M2223/045; C10N; C10N2010/00; C10N2010/02; C10N2010/04; C10N2010/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
146 words
In the process for making dialkylthiophosphates of the general formula: ##EQU3## in which R 1 and R 2 stand for identical or different linear and/or branched alkyl radicals having from 1 to 6 carbon atoms, M stands for a metal cation and n stands for the valence of the metal cation concerned, wherein O,O-dialkylphosphites of the general formula: ##EQU4## in which R 1 and R 2 have the meanings given above, are reacted with a compound yielding the metal cation M, in the presence of pulverulent sulfur and organic solvents at elevated temperature, the improvement which comprises reacting an oxide of zinc, cadmium or lead or either in admixture with at most 50 weight % of the corresponding metal carbonates or basic metal oxides as the compound yielding the metal cation M, with the remaining reaction compounds, whereby high grade and very pure dialkylthiophosphates are obtained.
Claim 2
Dependent Claim
146 words
In the process for making dialkylthiophosphates of the general formula: ##EQU3## in which R 1 and R 2 stand for identical or different linear and/or branched alkyl radicals having from 1 to 6 carbon atoms, M stands for a metal cation and n stands for the valence of the metal cation concerned, wherein O,O-dialkylphosphites of the general formula: ##EQU4## in which R 1 and R 2 have the meanings given above, are reacted with a compound yielding the metal cation M, in the presence of pulverulent sulfur and organic solvents at elevated temperature, the improvement which comprises reacting an oxide of zinc, cadmium or lead or either in admixture with at most 50 weight % of the corresponding metal carbonates or basic metal oxides as the compound yielding the metal cation M, with the remaining reaction compounds, whereby high grade and very pure dialkylthiophosphates are obtained.
Claim 3
Dependent Claim
26 words
The process as claimed in claim 1, wherein the reaction mixture is used in admixture with a water-binding agent or a solvent being a water entrainer.
Claim 4
Dependent Claim
26 words
The process as claimed in claim 2, wherein the water-binding agent is used in proportions approximately equivalent to the quantity of water formed during the reaction.
Claim 5
Dependent Claim
18 words
The process as claimed in claim 1, wherein the sulfur has a particle size smaller than 1 mm.
Claim 6
Dependent Claim
18 words
The process as claimed in claim 4, wherein the sulfur has a particle size smaller than 0.01 mm.
Claim 7
Dependent Claim
20 words
The process as claimed in claim 1, wherein the reaction is effected at temperatures within the range 25° and 150°C.
Claim 8
Dependent Claim
25 words
The process as claimed in claim 1, wherein the organic solvents are selected from alcohols, ethers, aliphatic or aromatic hydrocarbons, chlorinated, satured or unsaturated hydrocarbons.
References Cited (Backward Citations)
US2344394A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |