US3855281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stable compositions for of inhibiting polymerization of unsaturated carboxylic acid esters
Assignee: Monsanto Co
•
Filing: 1973-09-21
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Granted: 1974-12-17
•
Expires: 1993-09-21
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 phenylenediamine of the formula IN WHICH X is hydrogen, chloro, trichloromethyl, trifluoromethyl, nitro, lower alkyl, lower alkoxy or phenoxy and R and R1 are alkyl or when X is hydrogen, R may be hydrogen when R1 is tertiary alkyl or R and R1 together with the nitrogen atom is a heterocycle selected from the group consisting of pyrrolidinyl, 2,5-dimethyl pyrrolidinyl, piperidino and hexahydro-1H-azepin-1-yl.
Inventors
- 👤 A Sullivan
- 👤 G Wilder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:58
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/62
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
25 words
A MONOMER COMPOSITION CONSISTING ESSENTIALLY OF UNSATURATED CARBOYXLIC 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 CARBOYXLIC 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
33 words
The composition of claim 2 in which the sum of the carbon atoms of R and R1 is 2-10 and the amount of inhibitor is about 5-50 parts per million parts of ester.
Claim 5
Dependent Claim
16 words
The composition of claim 3 in which the inhibitor is a p-phenylenediamine and X is hydrogen.
Claim 6
Dependent Claim
13 words
The composition of claim 4 in which R and R1 are lower alkyl.
Claim 7
Dependent Claim
12 words
The composition of claim 5 in which R and R1 are methyl.
Claim 8
Dependent Claim
14 words
The composition of claim 4 in which R is hydrogen and R1 is tert-alkyl.
Claim 9
Dependent Claim
10 words
The composition of claim 7 in which R1 is tert-butyl.
Claim 10
Dependent Claim
10 words
The composition of claim 7 in which R1 is tert-amyl.
Claim 11
Dependent Claim
7 words
The composition of claim 4 in which
Claim 12
Dependent Claim
7 words
The composition of claim 4 in which
Claim 13
Dependent Claim
12 words
The composition of claim 4 in which the ester is an acrylate.
References Cited (Backward Citations)
US2822348A
Cited
US3580947A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |