Patent US3896162A successfully refreshed from Google Patents.
US3896162A
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Stable compositions and methods of inhibiting polymerization of unsaturated carboxylic acid esters
Assignee: Monsanto Co
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Filing: 1974-01-23
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Granted: 1975-07-22
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Expires: 1994-01-23
Abstract
Abstract A method of inhibiting polymerization of unsaturated carboxylic acid esters and improved unsaturated carboxylic acid ester compositions are described. The method comprises, and the compositions are prepared by, incorporating into the ester composition a N-(nitroalkyl)phenylenediamine of the formula IN WHICH R is lower alkyl, R'' is hydrogen, nitro or lower alkyl and X is hydrogen, lower alkyl or lower alkoxy.
Inventors
- 👤 Darrell Dexter Mullins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:07
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/62
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A MONOMER COMPOSITION CONSISTING ESSENTIALLY OF UNSATURATED CARBOXYLIC ACID ESTER AND, IN AMOUNT EFFECTIVE TO INHIBIT POLYMERIZATION OF THE ESTER, AN INHIBITOR OF THE FORMULA
Claim 2
Dependent Claim
25 words
A MONOMER COMPOSITION CONSISTING ESSENTIALLY OF UNSATURATED CARBOXYLIC ACID ESTER AND, IN AMOUNT EFFECTIVE TO INHIBIT POLYMERIZATION OF THE ESTER, AN INHIBITOR OF THE FORMULA
Claim 3
Dependent Claim
20 words
The composition of claim 1 in which the ester is a lower alkyl ester of an ethylenically unsaturated monocarboxylic acid.
Claim 4
Dependent Claim
21 words
The composition of claim 2 in which the amount of inhibitor is at least 5 parts per million parts of ester.
Claim 5
Dependent Claim
17 words
The composition of claim 3 in which R and R'' are lower alkyl and X is hydrogen.
Claim 6
Dependent Claim
12 words
The composition of claim 4 in which R and R'' are methyl.
Claim 7
Dependent Claim
12 words
The composition of claim 3 in which the ester is an acrylate.
References Cited (Backward Citations)
US2619479A
Cited
US2681918A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |