CH158723A - Process for the preparation of a tanning substance. - Google Patents
Process for the preparation of a tanning substance.Info
- Publication number
- CH158723A CH158723A CH158723DA CH158723A CH 158723 A CH158723 A CH 158723A CH 158723D A CH158723D A CH 158723DA CH 158723 A CH158723 A CH 158723A
- Authority
- CH
- Switzerland
- Prior art keywords
- tanning
- preparation
- parts
- tanning substance
- formaldehyde
- Prior art date
Links
Landscapes
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
Verfahren zur Darstellung eines gerbenden Stoffes. Es wurde gefunden, dass man ein in Wasser in jedem Verhältnis klar lösliche und zum Gerben wertvolles Produkt erhält, wenn man p-Dioxydiphenylsulfon in konzen trierter Lösung bei Gegenwart von. Naph- thalinmonosulfo.säure mit Formaldehyd er hitzt. Die Konstitution des Endstoffes ist unbekannt und die Wirkungsweise der Naph- thalinmonosulfosäure nicht mit Sicherheit an zugeben.
Das neue Produkt wird in Lösung durch Kochsalz gefällt, und durch Ferrichlo- rid wird ein blauvioletter Niederschlag er zeugt. Der neue Gerbstoff liefert bei der Ger bung ein Leder, das .sowohl hinsichtlich der Lichtechtheit, als auch der Fülle demjenigen überlegen ist, das mit den künstlichen Gerb stoffen erhalten wird, die aus Phenolen nach bekannten Verfahren hergestellt sind.
Beispiel: 200 Teile Naphthalinmonosulfosäure, <B>100</B> Teile p-Dioxydiphenylsulfon und 20 Teile Wasser werden nur eine Stunde lang hei 115 mit 60 Teilen Formaldehyd 30 % er hitzt; das in Wasser schwer lösliche Reak- tionsgemisch wird mit Lauge neutralisiert, mit Essigsäure schwach angesäuert, so dass beim Gerben keine Schwellung der Blösse eintritt, und mit Wasser auf 800 Teile ein gestellt. Zur Ausführung der Gerbung ge nügen 60 bis 80 Teile des neuen Produkte auf<B>100</B> Teile Blössengewicht, je nach Art der verwendeten Blösse; es wird gegerbt.
wie bei vegetabilischen Gerbstoffen üblich ist.
Process for the preparation of a tanning substance. It has been found that a product which is clearly soluble in water in any ratio and is valuable for tanning is obtained if p-dioxydiphenyl sulfone is obtained in concentrated solution in the presence of. Naphthalene monosulfonic acid is heated with formaldehyde. The constitution of the end product is unknown and the mode of action of the naphthalene monosulfonic acid cannot be stated with certainty.
The new product is precipitated in solution using common salt, and ferric chloride produces a blue-violet precipitate. When tanning, the new tanning agent supplies a leather that is superior to that obtained with artificial tanning materials made from phenols by known processes in terms of both lightfastness and fullness.
Example: 200 parts of naphthalene monosulphonic acid, 100 parts of p-dioxydiphenylsulphone and 20 parts of water are heated to 115 with 60 parts of 30% formaldehyde for only one hour; the reaction mixture, which is sparingly soluble in water, is neutralized with lye, weakly acidified with acetic acid so that the pelt does not swell during tanning, and adjusted to 800 parts with water. To carry out the tanning, 60 to 80 parts of the new product per <B> 100 </B> parts pelt weight are sufficient, depending on the type of pelt used; it is tanned.
as is common with vegetable tanning agents.
Claims (1)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1930G0025630 DE611671C (en) | 1930-11-11 | 1930-11-11 | Process for the preparation of tanning condensation products from dioxydiphenyl sulfones |
CH156126T | 1931-11-01 | ||
DEG86445D DE617469C (en) | 1930-11-11 | 1933-09-17 | Process for the preparation of tanning condensation products from dioxydiphenyl sulfones |
Publications (1)
Publication Number | Publication Date |
---|---|
CH158723A true CH158723A (en) | 1932-11-30 |
Family
ID=34108243
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH156126D CH156126A (en) | 1930-11-11 | 1931-11-01 | Process for the preparation of a tanning substance. |
CH158724D CH158724A (en) | 1930-11-11 | 1931-11-01 | Process for the preparation of a tanning substance. |
CH158723D CH158723A (en) | 1930-11-11 | 1931-11-01 | Process for the preparation of a tanning substance. |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH156126D CH156126A (en) | 1930-11-11 | 1931-11-01 | Process for the preparation of a tanning substance. |
CH158724D CH158724A (en) | 1930-11-11 | 1931-11-01 | Process for the preparation of a tanning substance. |
Country Status (1)
Country | Link |
---|---|
CH (3) | CH156126A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2834121C2 (en) * | 1978-08-03 | 1980-08-21 | Bayer Ag, 5090 Leverkusen | Condensation products from terphenyl sulfonic acids, naphthalene sulfonic acids, bis (4-hydroxyphenyl) sulfone and formaldehyde |
-
1931
- 1931-11-01 CH CH156126D patent/CH156126A/en unknown
- 1931-11-01 CH CH158724D patent/CH158724A/en unknown
- 1931-11-01 CH CH158723D patent/CH158723A/en unknown
Also Published As
Publication number | Publication date |
---|---|
CH158724A (en) | 1932-11-30 |
CH156126A (en) | 1932-07-31 |
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