CH252304A - Process for the production of a tanning condensation product. - Google Patents
Process for the production of a tanning condensation product.Info
- Publication number
- CH252304A CH252304A CH252304DA CH252304A CH 252304 A CH252304 A CH 252304A CH 252304D A CH252304D A CH 252304DA CH 252304 A CH252304 A CH 252304A
- Authority
- CH
- Switzerland
- Prior art keywords
- oxy
- production
- condensation product
- tanning
- condensation
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C317/00—Sulfones; Sulfoxides
-
- 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)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Description
Verfahren zur Herstellung eines gerbend wirkenden Kondensationsproduktes. Gegenstand vorliegenden Patentes ist ein Verfahren zur Herstellung eines gerbend wir kenden Kondensationsproduktes. D'as- Verfah ren ist dadurch gekennzeichnet, dass man 2 Oxy-diphenyl,sulfonsäure-(5), 4-Oxy-phenyl- 2'-oxy-diphenylyl-sulfon-(5') und Formalde hyd miteinander kondensiert. Der erhaltene neue Gerbstoff liefert sehr volle, weiche und weisse Leder von guter Lichtechtheit.
Beispiel <I>1:</I> 100 Gewichtsteile 2-Oxy-diphenyl wer den mit 60 Gewichtsteilen Schwefelsäure monohydrat 2 Stunden bei 110 bis 115 sul foniert. Anschliessend destilliert man das ge- bildete Reaktionswasser im Vakuum ab,
fügt hierauf 20 Gewichtsteile Phenol zu und er wärmt weitere 2 Stunden auf 125 bis 130 . Zuletzt werden zur Vervollständigung der Sulfonbildung bei der gleichen Temperatur Wasser und überschüssiges Phenol unter vermindertem Druck abdestilliert. Man ver dünnt nun die Schmelze, welche aus 2-Oxy- diphenyl-sulfonsäure-(5) und 4-Oxy-phenyl- 2'-oxy-diphenylyl-sulfon-(5') besteht, mit Wasser, setzt 25 Gewichtsteile Formaldehyd <B>30%</B> zu und kondensiert 25 Minuten bei 95 bis 100 ,
worauf eine Probe klar löslich ist. Das Produkt wird neutralisiert und mit Ameisensäure angesäuert. Es liefert sehr volle, weiche und weisse Leder von guter Lichtechtheit. <I>Beispiel 2:
</I> Eine nach Beispiel 1 hergestellte Mi schung von 2-Oxy-diphenyl-sulfonsäure-(5) und 4-Oxy-phenyl-2'-oxy-diphenylyl-sulfon- (5') wird nach dem Verdünnen mit Wasser mit Natronlauge deutlich lackmusalkalisch ge stellt und durch vierstündiges Kochen mit 30 Gewichtsteilen Formaldehyd 30#% kon- deneiert. Das mit Schwefelsäure neutrali- sierte und mit Ameisensäure angesäuerte Re aktionsprodukt gerbt ebensogut wie das in
Beispiel 1 beschriebene, ergibt aber noch we sentlich lichtechteres Leder.
Process for the production of a tanning condensation product. The present patent is a process for the preparation of a tanning we acting condensation product. The process is characterized in that 2 oxy-diphenyl, sulfonic acid (5), 4-oxy-phenyl-2'-oxy-diphenylyl-sulfone (5 ') and formaldehyde are condensed with one another. The new tanning agent obtained gives very full, soft and white leather of good lightfastness.
Example <I> 1 </I> 100 parts by weight of 2-oxydiphenyl who foniert with 60 parts by weight of sulfuric acid monohydrate at 110 to 115 for 2 hours. The water of reaction formed is then distilled off in vacuo,
then adds 20 parts by weight of phenol and it warms for another 2 hours to 125 to 130. Finally, to complete the sulfone formation, water and excess phenol are distilled off under reduced pressure at the same temperature. The melt, which consists of 2-oxy-diphenyl-sulfonic acid (5) and 4-oxy-phenyl-2'-oxy-diphenylyl-sulfone (5 '), is now thinned with water and 25 parts by weight of formaldehyde are used B> 30% </B> and condenses for 25 minutes at 95 to 100,
whereupon a sample is clearly soluble. The product is neutralized and acidified with formic acid. It provides very full, soft and white leather with good lightfastness. <I> Example 2:
</I> A mixture of 2-oxy-diphenyl-sulfonic acid (5) and 4-oxy-phenyl-2'-oxy-diphenylyl-sulfone (5 ') prepared according to Example 1 is diluted with water with Sodium hydroxide solution is clearly litmus-alkaline and condenses by boiling for four hours with 30 parts by weight of 30 #% formaldehyde. The reaction product neutralized with sulfuric acid and acidified with formic acid tans just as well as that in
Example 1 described, but we still give significantly more lightfast leather.
Claims (1)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH252304T | 1945-08-03 | ||
CH246989T | 1945-08-03 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH252304A true CH252304A (en) | 1947-12-15 |
Family
ID=25729177
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH252304D CH252304A (en) | 1945-08-03 | 1945-08-03 | Process for the production of a tanning condensation product. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH252304A (en) |
-
1945
- 1945-08-03 CH CH252304D patent/CH252304A/en unknown
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