US4026956A
Expired / Lapsed
US
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Storage stabilized methylchloroform formulations
Assignee: PPG Industries Inc
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Filing: 1975-06-11
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Granted: 1977-05-31
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Expires: 1995-06-11
Abstract
Abstract Methylchloroform formulations containing 1,3-dioxolanes and/or 1,4-dioxane are storage-stabilized by the addition of aliphatic aldehyde hydrazone.
Inventors
- 👤 James A. Manner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:53
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
89 words
In a methylchloroform formulation comprising a metal-induced decomposition stabilizing concentration of an additive selected from the group of 1,3-dioxolanes; 1,4-dioxane or mixtures thereof; wherein the improvement comprises a formulation containing a stabilizing concentration of aliphatic aldehyde hydrazone of up to 7 carbon atoms having the formula: ##STR4## wherein R 1 , R 2 , and R 3 each are either hydrogen or an alkyl group containing 1 to 4 carbon atoms, to storage-stabilize and substantially minimize the formation of peroxides or acids developed by the presence of said additive.
Claim 2
Dependent Claim
89 words
In a methylchloroform formulation comprising a metal-induced decomposition stabilizing concentration of an additive selected from the group of 1,3-dioxolanes; 1,4-dioxane or mixtures thereof; wherein the improvement comprises a formulation containing a stabilizing concentration of aliphatic aldehyde hydrazone of up to 7 carbon atoms having the formula: ##STR4## wherein R 1 , R 2 , and R 3 each are either hydrogen or an alkyl group containing 1 to 4 carbon atoms, to storage-stabilize and substantially minimize the formation of peroxides or acids developed by the presence of said additive.
Claim 3
Dependent Claim
10 words
The formulation of claim 1 wherein the additive is 1,4-dioxane.
Claim 4
Dependent Claim
20 words
The formulation of claim 1 wherein the aliphatic aldehyde hydrazone has a total of between 1 and 7 carbon atoms.
Claim 5
Dependent Claim
42 words
The formulation of claim 1 wherein the aliphatic aldehyde hydrazone is formaldehyde hydrazone, formaldehyde diethyl hydrazone, formaldehyde dimethyl hydrazone, formaldehyde methyl ethyl hydrazone, acetaldehyde dimethyl hydrazone, acetaldehyde methyl ethyl hydrazone, formaldehyde propyl hydrazone, formaldehyde isopropyl hydrazone, n-butylraldehyde dimethyl hydrazone or propionaldehyde hydrazone.
Claim 6
Dependent Claim
21 words
The formulation of claim 1 wherein the 1,3-dioxolanes are from the group of 4-methyl-1,3-dioxolane; 2-ethyl-1,3-dioxolane; 2,2-dimethyl-1,3-dioxolane; 4,4-diethyl-1,3-dioxolane; 2,5-dimethyl-1,3-dioxolane; 2-methyl-4-ethyl-1,3-dioxolane or 2-methyl-1,3-dioxolane.
Claim 7
Dependent Claim
22 words
The formulation of claim 1 which contains a nitroaliphatic in addition to the 1,3-dioxolanes; 1,4-dioxane or mixture thereof and aliphatic aldehyde hydrazone.
Claim 8
Dependent Claim
14 words
The formulation of claim 6 wherein the nitroaliphatic in nitromethane, nitroethane, 1-nitropropane or 2-nitropropane.
Claim 9
Dependent Claim
22 words
The formulation of claim 1 which contains an epoxide in addition to the 1,3-dioxolanes; 1,4-dioxane or mixture thereof and aliphatic aldehyde hydrazone.
Claim 10
Dependent Claim
27 words
The formulation of claim 8 wherein the epoxide is epichlorohydrin; glycidol; propylene oxide; cis-2,3-pentene oxide; 2-methyl-2,3-epoxybutane; 1,2-epoxy-cyclopentene; 2,3-dimethyl-2,3-epoxybutane; 2-chloro-3,4-epoxybutane; 1-chloro-2,3-epoxybutane; styrene oxide, butadiene diepoxide or butylene oxide.
Claim 11
Dependent Claim
19 words
The formulation of claim 8 wherein the epoxide is a saturated monoepoxide containing from 3 to 8 carbon atoms.
Claim 12
Dependent Claim
15 words
The formulation of claim 10 wherein the epoxide contains from 4 to 6 carbon atoms.
Claim 13
Dependent Claim
29 words
The formulation of claim 1 which contains an alkynol or short chain aliphatic monohydric saturated alcohol in addition to the 1,3-dioxolanes; 1,4-dioxane or mixture thereof and aliphatic aldehyde hydrazone.
Claim 14
Dependent Claim
20 words
The formulation of claim 12 wherein the alkynol contains from 3 to 12 carbon atoms and a single triple bond.
Claim 15
Dependent Claim
16 words
The formulation of claim 13 wherein the saturated alcohol contains from 1 to 8 carbon atoms.
Claim 16
Dependent Claim
15 words
The formulation of claim 1 wherein the additive is a mixture of 1,3-dioxolanes and 1,4-dioxane.
Claim 17
Dependent Claim
26 words
The formulation of claim 1 wherein the stabilizing concentration of aliphatic aldehyde hydrazone is a concentration from 0.001 to about 5 weight percent of the methylchloroform.
Claim 18
Dependent Claim
26 words
The formulation of claim 1 wherein the stabilizing concentration of aliphatic aldehyde hydrazone is a concentration from 0.005 to 0.1 percent by weight of the methylchloroform.
Claim 19
Dependent Claim
28 words
The formulation of claim 1 wherein the weight proportion of 1,3-dioxolanes; 1,4-dioxane or mixtures thereof to aliphatic aldehyde hydrazone is from 10 to 1 to 500 to 1.
Claim 20
Dependent Claim
27 words
The formulation of claim 1 wherein the concentration of 1,3-dioxolanes, 1,4-dioxane or mixtures thereof is a concentration from 0.5 to 10 percent by weight of the methylchloroform.
Claim 21
Dependent Claim
27 words
The formulation of claim 1 wherein the concentration of 1,3-dioxolanes; 1,4-dioxane or mixtures thereof is a concentration from 1 to 5 percent by weight of the methylchloroform.
Claim 22
Dependent Claim
77 words
In a methylchloroform formulation comprising a metal-induced decomposition stabilizing concentration of 1,3-dioxolane; wherein the improvement comprises a formulation containing a stabilizing concentration of aliphatic aldehyde hydrazone of up to 7 carbon atoms having the formula: ##STR5## wherein R 1 , R 2 and R 3 each are either hydrogen or an alkyl group containing 1 to 4 carbon atoms, to storage-stabilize and substantially minimize the formation of peroxides or acids developed by the presence of said 1,3-dioxolanes.
Claim 23
Dependent Claim
77 words
In a methylchloroform formulation comprising a metal-induced decomposition stabilizing concentration of 1,3-dioxolane; wherein the improvement comprises a formulation containing a stabilizing concentration of aliphatic aldehyde hydrazone of up to 7 carbon atoms having the formula: ##STR5## wherein R 1 , R 2 and R 3 each are either hydrogen or an alkyl group containing 1 to 4 carbon atoms, to storage-stabilize and substantially minimize the formation of peroxides or acids developed by the presence of said 1,3-dioxolanes.
Claim 24
Dependent Claim
11 words
The formulation of claim 1 containing 1,3-dioxolane and acetaldehyde dimethyl hydrazone.
Claim 25
Dependent Claim
41 words
The formulation of claim 22 wherein the concentration of 1,3-dioxolane is a concentration from 0.5 to 10 percent by weight of the methylchloroform and the acetaldehyde dimethyl hydrazone is a concentration from 0.005 to 0.1 percent by weight of the methylchloroform.
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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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |