GB426006A - Improvements in the manufacture and production of synthetic tanning agents - Google Patents
Improvements in the manufacture and production of synthetic tanning agentsInfo
- Publication number
- GB426006A GB426006A GB2766333A GB2766333A GB426006A GB 426006 A GB426006 A GB 426006A GB 2766333 A GB2766333 A GB 2766333A GB 2766333 A GB2766333 A GB 2766333A GB 426006 A GB426006 A GB 426006A
- Authority
- GB
- United Kingdom
- Prior art keywords
- formaldehyde
- manufacture
- dioxydiphenylsulphones
- dioxydiphenylsulphone
- tanning agents
- 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)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
Products useful as tanning - agents are obtained by treating dioxydiphenylsulphones with water-soluble salts of sulphurous acid and with formaldehyde or reagents yielding formaldehyde. The reaction may be effected in an aqueous medium at a temperature above 100 DEG C. under pressure. Examples are given describing the manufacture of tanning agents by heating 4 : 4<1>-dioxydiphenylsulphone with various proportions of aqueous formaldehyde and sodium sulphite. Other specified starting materials are 4 : 4<1> - dioxy - 3 : 3<1> - dimethyldiphenylsulphone, 2 : 2<1> - dioxydiphenylsulphone, and halogenated dioxydiphenylsulphones. Trioxymethylene is mentioned as a substitute for formaldehyde. Potassium or ammonium sulphite may be used instead of sodium sulphite. Specification 425,037 is referred to.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2766333A GB426006A (en) | 1933-10-07 | 1933-10-07 | Improvements in the manufacture and production of synthetic tanning agents |
GB3172536A GB481308A (en) | 1933-10-07 | 1936-11-19 | Improvements in the manufacture and production of tanning agents |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2766333A GB426006A (en) | 1933-10-07 | 1933-10-07 | Improvements in the manufacture and production of synthetic tanning agents |
Publications (1)
Publication Number | Publication Date |
---|---|
GB426006A true GB426006A (en) | 1935-03-26 |
Family
ID=10263236
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2766333A Expired GB426006A (en) | 1933-10-07 | 1933-10-07 | Improvements in the manufacture and production of synthetic tanning agents |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB426006A (en) |
-
1933
- 1933-10-07 GB GB2766333A patent/GB426006A/en not_active Expired
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