GB760699A - Preparation of novolak resins - Google Patents
Preparation of novolak resinsInfo
- Publication number
- GB760699A GB760699A GB2652453A GB2652453A GB760699A GB 760699 A GB760699 A GB 760699A GB 2652453 A GB2652453 A GB 2652453A GB 2652453 A GB2652453 A GB 2652453A GB 760699 A GB760699 A GB 760699A
- Authority
- GB
- United Kingdom
- Prior art keywords
- formaldehyde
- phenols
- phenol
- reaction
- cresol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G8/00—Condensation polymers of aldehydes or ketones with phenols only
- C08G8/04—Condensation polymers of aldehydes or ketones with phenols only of aldehydes
- C08G8/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes of formaldehyde, e.g. of formaldehyde formed in situ
Abstract
In making a novolak resin by condensing a molar excess of phenolic compounds containing phenol, meta-cresol or meta-ethyl phenol with formaldehyde, the reaction is effected at a pH of 4 to 7 in the presence of the oxide or hydroxide of divalent cadmium as condensation catalyst. Other phenols may be used in conjunction with at least one of the aforementioned phenols, e.g. commercial xylenols. The preferred starting material is pure phenol or an isomeric mixture of cresols containing m-cresol. The molar ratio of phenols to formaldehyde is preferably from 1.8:1 to 2.5:1. The reaction is effected by mixing the phenol(s) and formaldehyde (as formalin or paraformaldehyde), adding the catalyst thereto and heating gently until reaction occurs, volatile compounds being allowed to distif off until the temperature reaches 150 DEG to 160 DEG C. When the desired degree of condensation has been reached, residual volatile compounds, e.g. unreacted phenols, may then be removed either by vacuum distillation or by addition of further formaldehyde with further heating. Examples are given.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2652453A GB760699A (en) | 1953-09-26 | 1953-09-26 | Preparation of novolak resins |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2652453A GB760699A (en) | 1953-09-26 | 1953-09-26 | Preparation of novolak resins |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB760699A true GB760699A (en) | 1956-11-07 |
Family
ID=10244983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2652453A Expired GB760699A (en) | 1953-09-26 | 1953-09-26 | Preparation of novolak resins |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB760699A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4839445A (en) * | 1985-09-17 | 1989-06-13 | Unitika, Ltd. | Spherical particles of thermosetting phenolic resin and process for producing the same |
| WO2012112043A1 (en) * | 2011-02-16 | 2012-08-23 | Trespa International B.V. | A method for reducing the formaldehyde content of a resinous starting material |
-
1953
- 1953-09-26 GB GB2652453A patent/GB760699A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4839445A (en) * | 1985-09-17 | 1989-06-13 | Unitika, Ltd. | Spherical particles of thermosetting phenolic resin and process for producing the same |
| WO2012112043A1 (en) * | 2011-02-16 | 2012-08-23 | Trespa International B.V. | A method for reducing the formaldehyde content of a resinous starting material |
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