GB721836A - Improvements in or relating to process of preparing novolak resin derivatives - Google Patents
Improvements in or relating to process of preparing novolak resin derivativesInfo
- Publication number
- GB721836A GB721836A GB29462/51A GB2946251A GB721836A GB 721836 A GB721836 A GB 721836A GB 29462/51 A GB29462/51 A GB 29462/51A GB 2946251 A GB2946251 A GB 2946251A GB 721836 A GB721836 A GB 721836A
- Authority
- GB
- United Kingdom
- Prior art keywords
- formaldehyde
- novolak
- phenol
- heated
- acid
- 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
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
- C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
- C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
A synthetic tannin is made by condensing in aqueous alkaline medium (1) a novolak resin of molecular weight between 600 and 1800 obtained from phenol, cresol or xylenol and formaldehyde or a formaldehyde yielding compound; (2) an alkali metal salt of sulphurous acid (e.g. sodium or potassium sulphite, bisulphite or metabisulphite) in an amount to provide from 0.1 to 0.5 molecular proportions of combined sulphur dioxide for each aromatic ring in the novolak; and (3) formaldehyde or paraformaldehyde in an amount to provide 1-6 molecular proportions of formaldehyde for each molecular proportion of combined sulphur dioxide in said salt. Preferably the reaction mixture is heated at 30-130 DEG C. (preferably 70-100 DEG C.) for 75-360 minutes, after which it is cooled and acidified to pH 3.0-4.7 with glycollic plus sulphuric or phosphoric acid. The novolaks are obtained by refluxing 2 mols. of phenol with 1.0-1.2 mols. of formaldehyde at 90-96 DEG C. for 2-6 hours in presence of an acid catalyst, e.g. sulphuric acid. In examples: (1), (3) and (4) a phenol-formaldehyde novolak was heated with formaldehyde and sodium sulphite; (2) a xylenol-formaldehyde novolak was heated with formaldehyde and sodium sulphite.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US721836XA | 1950-12-23 | 1950-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB721836A true GB721836A (en) | 1955-01-12 |
Family
ID=22106093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29462/51A Expired GB721836A (en) | 1950-12-23 | 1951-12-17 | Improvements in or relating to process of preparing novolak resin derivatives |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB721836A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE30650E (en) | 1979-12-14 | 1981-06-16 | Hoechst Aktiengesellschaft | Dispersing and stabilizing agents for dyestuffs |
-
1951
- 1951-12-17 GB GB29462/51A patent/GB721836A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE30650E (en) | 1979-12-14 | 1981-06-16 | Hoechst Aktiengesellschaft | Dispersing and stabilizing agents for dyestuffs |
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