US4362573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized chlorinated solvents
Assignee: Imperial Chemical Industries Ltd
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Filing: 1980-07-28
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Granted: 1982-12-07
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Expires: 2000-07-28
Abstract
Abstract A solvent composition comprising 1,1,1-trichloroethane and a stabilizing amount of an epoxide of formula ##STR1## wherein R 1 and R 2 are hydrogen, alkyl of 1 to 4 carbon atoms, phenyl or benzyl, R 3 is hydrogen or alkyl of 1 to 4 carbon atoms, R 4 is alkyl of 1 to 4 carbon atoms and n is 0 or 1. Preferably the or each alkyl group contains 1 or 2 carbon atoms; examples of useful epoxides are ethyl trans-2,3-epoxybutyrate, ethyl 3,4-epoxy-3-methylvalerate and ethyl beta-methyl-beta-phenylglycidate.
Inventors
- 👤 William C. Mackrodt
- 👤 Richard B. Jones
- 👤 Neil Winterton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:19
CPC Classifications
C; C23; C23G; C23G5/00; C23G5/02; C23G5/028; C23G5/02854; C23G5/02861; C23G5/0288; C07; C07C; C07C17/00; C07C17/38; C07C17/42
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
105 words
A solvent composition comprising 1,1,1-trichloroethane and a stabilising amount ranging from 0.05% to 5% by weight based on the weight of 1,1,1-trichloroethane of a stabilising agent, characterized in that the stabilising agent is an epoxide of the formula. ##STR3## wherein R 1 , R 2 and R 3 , which may be the same or different, represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and wherein R 1 or R 2 may also be a phenyl group or a benzyl group, n is 0 or 1, and R 4 is an alkyl group having 1 to 2 carbon atoms.
Claim 2
Dependent Claim
105 words
A solvent composition comprising 1,1,1-trichloroethane and a stabilising amount ranging from 0.05% to 5% by weight based on the weight of 1,1,1-trichloroethane of a stabilising agent, characterized in that the stabilising agent is an epoxide of the formula. ##STR3## wherein R 1 , R 2 and R 3 , which may be the same or different, represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and wherein R 1 or R 2 may also be a phenyl group or a benzyl group, n is 0 or 1, and R 4 is an alkyl group having 1 to 2 carbon atoms.
Claim 3
Dependent Claim
35 words
A solvent composition as claimed in claim 1 wherein in the stabilising agent the alkyl group represented by and any of R 1 , R 2 and R 3 contains 1 or 2 carbon atoms.
Claim 4
Dependent Claim
33 words
A solvent composition as claimed in claim 1 or claim 2 wherein in the stabilising agent, R 1 and R 4 are alkyl groups and R 2 and R 3 are hydrogen atoms.
Claim 5
Dependent Claim
34 words
A solvent composition as claimed in claim 1 or claim 2 wherein in the stabilising agent, R 1 , R 3 and R 4 are alkyl groups and R 2 is a hydrogen atom.
Claim 6
Dependent Claim
37 words
A solvent composition as claimed in claim 1 or claim 2 wherein in the stabilising agent, R 1 and R 4 are alkyl groups, R 3 is a hydrogen atom and R 2 is a phenyl group.
Claim 7
Dependent Claim
15 words
A solvent composition as claimed in claim 3 wherein the stabilising agent is ethyl trans-2,3-epoxybutyrate.
Claim 8
Dependent Claim
15 words
A solvent composition as claimed in claim 4 wherein the stabilising agent is ethyl 3,4-epoxy-3-methylvalerate.
Claim 9
Dependent Claim
15 words
A solvent composition as claimed in claim 5 wherein the stabilising agent is ethyl beta-methyl-beta-phenylglycidate.
Claim 10
Dependent Claim
22 words
A solvent composition as claimed in any one of the preceding claims which contains one or more additional stabilising agents for 1,1,1-trichloroethane.
Claim 11
Dependent Claim
32 words
A solvent composition as claimed in claim 9 wherein the amount of the or each additional stabilising agent is not greater than 3% by weight based on the weight of the 1,1,1-trichloroethane.
Claim 12
Independent Claim
35 words
A method of inhibiting decomposition of 1,1,1-trichloroethane in the presence of metals, which comprises incorporating in the 1,1,1-trichloroethane a stabilising amount of an organic epoxide as defined in any one of claims 1 to 8.
Claim 13
Independent Claim
30 words
A method of degreasing articles which comprises bringing the articles into contact with a solvent composition as claimed in any one of claims 1 to 10, or the vapour thereof.
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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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |