US3956403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brominated biphenols
Assignee: General Electric Co
•
Filing: 1975-08-18
•
Granted: 1976-05-11
•
Expires: 1995-08-18
Abstract
Abstract Bromobiphenols containing at least two bromine atoms meta to the phenolic hydroxyl groups can be produced from 3,3',5,5'-tetra-substituted diphenoquinones by reacting the latter with bromine. The reaction can be controlled to produce little, if any, by-product. The products obtained are dependent to some extent on the substituents in the four positions ortho to the hydroxyl groups. The biphenols can be used as antioxidants or as starting materials for preparation of flame-retardent polymeric compositions useful in the molding, coating and insulating arts.
Inventors
- 👤 Charles M. Orlando
- 👤 Francois A. Lavallee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:22
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/62; C08; C08G; C08G59/00; C08G59/18; C08G59/20; C08G59/22; C08G59/30; C08G63/00; C08G63/68; C08G63/682; C08K; C08K5/00; C08K5/04; C08K5/13; C08K5/136; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/20; C10L1/203; C08L; C08L2201/00; C08L2201/02; C08L69/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
A bromination process which comprises contacting liquid bromine with a diphenoquinone of the formula ##SPC3## where independently each R 1 , R 2 , R 3 and R 4 is a normal methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl or octyl radical or is a cyclohexyl radical, and recovering a biphenol of the formula ##SPC4## where each R 1 , R 2 , R 3 and R 4 is as previously defined.
Claim 2
Dependent Claim
72 words
A bromination process which comprises contacting liquid bromine with a diphenoquinone of the formula ##SPC3## where independently each R 1 , R 2 , R 3 and R 4 is a normal methyl, ethyl, propyl, butyl, pentyl, hexyl, heptyl or octyl radical or is a cyclohexyl radical, and recovering a biphenol of the formula ##SPC4## where each R 1 , R 2 , R 3 and R 4 is as previously defined.
Claim 3
Dependent Claim
20 words
The process of claim 1, wherein the mole ratio of bromine to diphenoquinone is at least greater than about 1.5:1.
Claim 4
Dependent Claim
19 words
The process of claim 2, wherein the diphenoquinone is added to the liquid bromine at about ambient room temperature.
Claim 5
Dependent Claim
20 words
The process of claim 3, wherein the resulting reaction mixture is heated at elevated temperatures to complete the bromination reaction.
Claim 6
Dependent Claim
23 words
The process of claim 1, wherein independently each R 1 , R 2 , R 3 and R 4 is a methyl radical.
Claim 7
Dependent Claim
22 words
The process of claim 4, wherein each R 1 , R 2 , R 3 and R 4 is a methyl radical.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |