US3888922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilizing acrylic acid with alkylated phenols
Assignee: Celanese Corp
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Filing: 1973-04-30
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Granted: 1975-06-10
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Expires: 1993-04-30
Abstract
Abstract Acrylic acid is stabilized against vinyl-type polymerization with alkylated phenols such as butylated hydroxytoluene or butylated hydroxyanisole, both of which, at suitable levels, are acceptable for incorporation into foods, drugs and cosmetics.
Inventors
- 👤 Leon B Levy
- 👤 Gene J Fisher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:39
CPC Classifications
C; C07; C07C; C07C51/00; C07C51/42; C07C51/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
A COMPOSITION CONSISTING ESSENTIALLY OF ACRYLIC ACID STABILIZED WITH AT LEAST ABOUT 0.001% ITS WEIGHT OF AT LEAST ONE STABILIZING BRANCHED LOWER ALKYL-SUBSTITUTED PHENOL WHICH IS A MEMBER OF THE GROUP CONSISTING OF TRI-LOWER ALKYL PHENOLS AND LOWER ALKYL-LOWER ALKOXY PHENOLS.
Claim 2
Dependent Claim
41 words
A COMPOSITION CONSISTING ESSENTIALLY OF ACRYLIC ACID STABILIZED WITH AT LEAST ABOUT 0.001% ITS WEIGHT OF AT LEAST ONE STABILIZING BRANCHED LOWER ALKYL-SUBSTITUTED PHENOL WHICH IS A MEMBER OF THE GROUP CONSISTING OF TRI-LOWER ALKYL PHENOLS AND LOWER ALKYL-LOWER ALKOXY PHENOLS.
Claim 3
Dependent Claim
17 words
The composition according to claim 1 wherein the phenol is a branched lower alkyl-substituted methyl- or methoxy-phenol.
Claim 4
Dependent Claim
24 words
The composition of claim 1 wherein the stabilizer is present in an amount of about 0.001 to 0.5% by weight of the acrylic acid.
Claim 5
Dependent Claim
23 words
The composition of claim 2 wherein the stabilizer is a member of thE group consisting of butylated hydroxytoluene, butylated hydroxyanisole, and mixtures thereof.
Claim 6
Dependent Claim
26 words
The composition of claim 4 wherein the stabilizer is butylated hydroxytoluene present in an amount of about 0.001 to 0.5% by weight of the acrylic acid.
Claim 7
Dependent Claim
26 words
The composition of claim 4 wherein the stabilizer is butylated hydroxyanisole present in an amount of about 0.001 to 0.5% by weight of the acrylic acid.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-09 | 1978-12-09 | 1979-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-09 | 1982-12-09 | 1983-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-09 | 1986-12-09 | 1987-06-10 | $7700.00 | Window Closed / Lapsed |