US4418231A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibited solvent compositions
Assignee: PPG Industries Inc
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Filing: 1981-08-07
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Granted: 1983-11-29
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Expires: 2001-08-07
Abstract
Abstract 2-Alkylidene-1,3-dioxolanes and 2-(1-alkylalkylidene)-1,3-dioxolanes are employed as acid acceptors in methylchloroform, trichloroethylene or mixtures thereof. The preferred acid acceptor is 2-methylene-1,3-dioxolane. In another aspect of the invention, aliphatic aldehyde hydrazone is employed to stabilize 2-alkylidene-1,3-dioxolane and 2-(1-alkylalkylidene)-1,3-dioxolane. The preferred aliphatic aldehyde hydrazone is acetaldehyde dimethylhydrazone.
Inventors
- 👤 Steven E. Pamer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:35
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02854; C23G5/02861; C23G5/02877; C07; C07C; C07C17/00; C07C17/38; C07C17/42; C11; C11D; C11D3/00; C11D3/0005; C11D3/0073
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
67 words
Solvent composition comprising: a. a member selected from the group consisting of methylchloroform, trichloroethylene and a mixture thereof; and b. a corrosion inhibiting amount of acid acceptor represented by the structural formula ##STR7## wherein R 1 and R 2 are each independently hydrogen, methyl or ethyl and wherein R 3 and R 4 are each independently hydrogen or alkyl containing from 1 to about 6 carbon atoms.
Claim 2
Dependent Claim
67 words
Solvent composition comprising: a. a member selected from the group consisting of methylchloroform, trichloroethylene and a mixture thereof; and b. a corrosion inhibiting amount of acid acceptor represented by the structural formula ##STR7## wherein R 1 and R 2 are each independently hydrogen, methyl or ethyl and wherein R 3 and R 4 are each independently hydrogen or alkyl containing from 1 to about 6 carbon atoms.
Claim 3
Dependent Claim
44 words
The solvent composition of claim 1 wherein said member constitutes from about 85 percent to about 99.99 percent by weight of said solvent composition, and wherein said acid acceptor constitutes from about 0.01 percent to about 10 percent by weight of said solvent composition.
Claim 4
Dependent Claim
15 words
The solvent composition of claim 1 wherein R 1 and R 2 are both hydrogen.
Claim 5
Dependent Claim
27 words
The solvent composition of claim 1 wherein R 3 and R 4 are each independently hydrogen or lower alkyl containing from 1 to about 4 carbon atoms.
Claim 6
Dependent Claim
19 words
The solvent composition of claim 1 wherein R 3 and R 4 are each independently hydrogen, methyl or ethyl.
Claim 7
Dependent Claim
15 words
The solvent composition of claim 1 wherein R 3 and R 4 are both hydrogen.
Claim 8
Dependent Claim
12 words
The solvent composition of claim 1 wherein said acid acceptor is 2-methylene-1,3-dioxolane.
Claim 9
Dependent Claim
11 words
The solvent composition of claim 1 wherein said member is trichloroethylene.
Claim 10
Dependent Claim
96 words
The solvent composition of claim 8 which also contains at least one of the following: aromatic compound having a phenolic hydroxyl group and having a normal boiling temperature in the range of from about 180° C. to about 250° C., saturated aliphatic monoepoxide containing from about 3 to about 8 carbon atoms, saturated cycloaliphatic monoepoxide containing from about 6 to about 8 carbon atoms, alkanol containing from 1 to about 8 carbon atoms and aliphatic aldehyde hydrazone having from 1 to about 7 carbon atoms wherein no aliphatic group has more than about 4 carbon atoms.
Claim 11
Dependent Claim
11 words
The solvent composition of claim 1 wherein said member is methylchloroform.
Claim 12
Dependent Claim
125 words
The solvent composition of claim 10 which also contains at least one of the following: nitroalkane having from 1 to about 3 carbon atoms, saturated aliphatic monoepoxide containing from about 3 to about 8 carbon atoms, saturated cycloaliphatic monoepoxide containing from about 6 to about 8 carbon atoms, 1,4-dioxane, 1,3-dioxolane containing up to two alkyl substituents, each of the alkyl substituents having from 1 to 2 carbon atoms, acetone, methyl ethyl ketone, methyl isopropyl ketone, diethyl ketone, acetonitrile, propionitrile, acrylonitrile, an alkynol having from 3 to about 12 carbon atoms, an alkanol having from 1 to about 8 carbon atoms, dimethyoxymethane, aliphatic aldehyde hydrazone having from 1 to about 7 carbon atoms wherein no aliphatic group has more than about 4 carbon atoms, and toluene.
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |