US4309301A
Expired / Lapsed
US
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Methylchloroform stabilizer composition employing an alkynyl sulfide
Assignee: Dow Chemical Co
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Filing: 1980-12-31
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Granted: 1982-01-05
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Expires: 2000-12-31
Abstract
Abstract An alkyl alkynyl sulfide can be employed to stabilizer methylchloroform against reaction with the common metals of construction. Stabilization is enhanced by combining with other known stabilizers. Nitroalkanes, alkyl nitrates or alkynols may be employed to eliminate the need of dioxane and alkylene oxides, while the use of the alkyl nitrates or alkynols eliminates the need for a nitroalkane in the stabilizer formulation.
Inventors
- 👤 Nobuyuki Ishibe
- 👤 Thomas G. Metcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:14
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02854; C23G5/02893; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
41 words
A stabilized methylchloroform composition consisting essentially of methylchloroform and an alkyl 2-propynyl sulfide, wherein the alkyl group contains from 1-3 carbon atoms and the alkyl 2-propynyl sulfide is present in a concentration of from about 2 to about 8 volume percent.
Claim 2
Dependent Claim
41 words
A stabilized methylchloroform composition consisting essentially of methylchloroform and an alkyl 2-propynyl sulfide, wherein the alkyl group contains from 1-3 carbon atoms and the alkyl 2-propynyl sulfide is present in a concentration of from about 2 to about 8 volume percent.
Claim 3
Dependent Claim
24 words
The composition of claim 1 wherein the alkyl 2-propynyl sulfide is present in a concentration of from about 3 to about 5 volume percent.
Claim 4
Dependent Claim
92 words
The composition of claim 1 wherein the composition contains a second stabilizer selected from the group consisting of a nitroalkane having from 1 to 3 carbon atoms, an alkyl nitrate having from 1 to 3 carbon atoms and an acetylenic alcohol having from 3 to 5 carbon atoms and wherein the alkyl propynyl sulfide is present in an amount of from about 1 to about 5 percent and the second stabilizer is present in an amount of from about 1 to about 5 percent based on the total volume of the composition.
Claim 5
Dependent Claim
19 words
The composition of claim 3 wherein the alkyl propynyl sulfide is methyl-2-propynyl sulfide, and the second stabilizer is 2-methyl-3-butyn-2-ol.
Claim 6
Dependent Claim
21 words
The composition of claim 3 wherein the alkyl propynyl sulfide is methyl-2-propynyl sulfide, and the second stabilizer is nitromethane or nitroethane.
Claim 7
Independent Claim
36 words
A method of stabilizing methylchloroform against attack by metals in contact therewith consisting essentially of blending with said methylchloroform as the stabilizer a lower alkyl-2-propynyl sulfide, prior to placing said metals in contact with said methylchloroform.
Claim 8
Independent Claim
36 words
A method of stabilizing methylchloroform against attack by metals in contact therewith consisting essentially of blending with said methylchloroform as the stabilizer a lower alkyl-2-propynyl sulfide, prior to placing said metals in contact with said methylchloroform.
Claim 9
Dependent Claim
20 words
The method of claim 6 wherein the lower alkyl group of the stabilizer contains from 1 to 3 carbon atoms.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein the lower alkyl-2-propynyl sulfide is methyl-2-propynyl sulfide.
Claim 11
Dependent Claim
27 words
The method of claim 8 wherein a second stabilizer selected from the group consisting of a nitroalkane, an alkyl nitrate, and an acetylenic alcohol is blended therewith.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |