Patent US4306094A successfully refreshed from Google Patents.
US4306094A
Expired / Lapsed
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Preparation of 4,4-dihydroxydiphenyl ethers
Assignee: EIDP Inc
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Filing: 1980-01-18
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Granted: 1981-12-15
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Expires: 2000-01-18
Abstract
Abstract Substituted and unsubstituted 1,4-dihydroxybenzenes are reacted in the presence of a cation exchange resin catalyst and an inert solvent to form the corresponding 4,4'-dihydroxydiphenyl ethers.
Inventors
- 👤 Raymond J. Shozda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:17
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/257; C07C43/295
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A process for producing 4,4'-dihydroxydiphenyl ether having the formula: ##STR7## comprising condensing 1,4-dihydroxybenzenes of the formula: ##STR8## in the presence of an inert solvent and a cation exchange catalyst having a large surface area and strong acid functionality, at a temperature between about 80° to 180° C.; wherein R represents the same or different substituents individually selected from hydrogen, alkoxy of up to 4 carbons, alkyl of up to 6 carbons, and halogen; said process characterized by a yield of diphenyl ether of 50% or more and a yield of triphenyl ether of 15% or less.
Claim 2
Dependent Claim
96 words
A process for producing 4,4'-dihydroxydiphenyl ether having the formula: ##STR7## comprising condensing 1,4-dihydroxybenzenes of the formula: ##STR8## in the presence of an inert solvent and a cation exchange catalyst having a large surface area and strong acid functionality, at a temperature between about 80° to 180° C.; wherein R represents the same or different substituents individually selected from hydrogen, alkoxy of up to 4 carbons, alkyl of up to 6 carbons, and halogen; said process characterized by a yield of diphenyl ether of 50% or more and a yield of triphenyl ether of 15% or less.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein the temperature is between 120° to 180° C.
Claim 4
Dependent Claim
15 words
A process according to claim 1 wherein all R substituents on the 1,4-dihydroxybenzene are H.
Claim 5
Dependent Claim
22 words
A process according to claim 1 wherein one R substituent on the 1,4-dihydroxybenzene is chlorine and the remaining R substituents are H.
Claim 6
Dependent Claim
22 words
A process according to claim 1 wherein one R substituent on the 1,4-dihydroxybenzene is methyl and the remaining R substituents are H.
Claim 7
Dependent Claim
22 words
A process according to claim 1 wherein 2 R substituents on the 1,4-dihydroxybenzene are methyl and the remaining R substituents are H.
Claim 8
Dependent Claim
15 words
A process according to claim 2 wherein all R substituents on the 1,4-dihydroxybenzene are H.
Claim 9
Dependent Claim
22 words
A process according to claim 2 wherein one R substituent on the 1,4-dihydroxybenzene is chlorine and the remaining R substituents are H.
Claim 10
Dependent Claim
22 words
A process according to claim 2 wherein one R substituent on the 1,4-dihydroxybenzene is methyl and the remaining R substituents are H.
Claim 11
Dependent Claim
22 words
A process according to claim 2 wherein 2 R substituents on the 1,4-dihydroxybenzene are methyl and the remaining R substituents are H.
References Cited (Backward Citations)
US4153810A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |