US4281098A
Expired / Lapsed
US
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Control of phenol/aldehyde condensation reactions
Assignee: BP Chemicals Ltd
•
Filing: 1979-10-24
•
Granted: 1981-07-28
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Expires: 1999-10-24
Abstract
Abstract Phenol/aldehyde condensation reactions are short-stopped by the addition of an aqueous solution of a salt of a weak acid and a metal of Groups III to VIII of the Periodic Table.
Inventors
- 👤 Bryan H. McCormick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:13
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
The process for retarding or stopping the condensation reaction between a phenol and an aldehyde in the presence of a catalyst which is a Group I or Group II metal hydroxide or a strong acid which comprises adding to the reaction at an elevated temperature an aqueous solution containing at least 10% by weight based on the weight of water, of a salt of a weak acid having a pK a in aqueous solution at 25° C. of more than 2.8 and a metal which is copper or a metal of Groups III to VIII of the Periodic Table.
Claim 2
Dependent Claim
99 words
The process for retarding or stopping the condensation reaction between a phenol and an aldehyde in the presence of a catalyst which is a Group I or Group II metal hydroxide or a strong acid which comprises adding to the reaction at an elevated temperature an aqueous solution containing at least 10% by weight based on the weight of water, of a salt of a weak acid having a pK a in aqueous solution at 25° C. of more than 2.8 and a metal which is copper or a metal of Groups III to VIII of the Periodic Table.
Claim 3
Dependent Claim
18 words
The process according to claim 1 wherein the phenol is phenol, an alkyl or alkenyl phenol, or cresol.
Claim 4
Dependent Claim
11 words
The process according to claim 1 wherein the aldehyde is formaldehyde.
Claim 5
Dependent Claim
25 words
The process according to any one of claims 1, 2 or 3 wherein the molar ratio of phenol to aldehyde is from 0.5:1 to 3:1.
Claim 6
Dependent Claim
21 words
The process according to any one of claims 1, 2 or 3 wherein the catalyst is sodium hydroxide or potassium hydroxide.
Claim 7
Dependent Claim
18 words
The process according to claims 1, 2 or 3 wherein the catalyst is sulphuric acid or oxalic acid.
Claim 8
Dependent Claim
25 words
The process according to claims 1, 2 or 3 wherein the salt of a weak acid is a salt of lactic acid or salicylic acid.
Claim 9
Dependent Claim
17 words
The process according to claims 1, 2 or 3 wherein said metal is aluminium, copper and iron.
Claim 10
Dependent Claim
31 words
The process according to claims 1, 2 or 3 wherein the salt of a weak acid and a metal has a solubility in water at 25° C. of at least 25%.
Claim 11
Dependent Claim
31 words
The process according to claims 1, 2 or 3 wherein the salt of a weak acid and a metal of Group III to VIII of the Periodic Table is aluminium lactate.
Claim 12
Dependent Claim
53 words
The process according to claims 1, 2 or 3 wherein the quantity of salt of a weak acid and a metal which is added is sufficient to give at least one equivalent of cation for each equivalent of hydroxide catalyst used or one equivalent of anion for each equivalent of acid catalyst used.
Claim 13
Dependent Claim
14 words
The process of claim 1 wherein the metal is a metal other than chromium.
References Cited (Backward Citations)
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US1799816A
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DE701679C
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US2579610A
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US2736701A
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DE1003956B
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GB880776A
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DE1720445A1
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |