EP1297188A1 - Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder - Google Patents
Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem lederInfo
- Publication number
- EP1297188A1 EP1297188A1 EP01964997A EP01964997A EP1297188A1 EP 1297188 A1 EP1297188 A1 EP 1297188A1 EP 01964997 A EP01964997 A EP 01964997A EP 01964997 A EP01964997 A EP 01964997A EP 1297188 A1 EP1297188 A1 EP 1297188A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chrome
- leather
- gallic acid
- chromium
- tanned leather
- 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.)
- Granted
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
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium compounds
-
- 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
- C14C3/28—Multi-step processes
Definitions
- the present invention relates to the use of gallic acid for stabilizing chromium III against undesired oxidation in chrome-tanned leather.
- tanning is understood to be a multi-stage process which serves to permanently preserve the unstable, perishable collagen of the animal skin freed from skin and hair, which is subjected to putrefaction and decomposition.
- the tannins used for tanning bring about a cross-linking of the skin's collagen molecules and thus the stabilization of the chain-like structures of the skin protein.
- Each tanning process runs in several phases, some of which are clearly separated from one another, but some of which merge.
- the preparation phase the skin substance is brought into the condition required for the process by soaking, pickling, liming, decalcifying, washing, pickling, pretanning or conditioning.
- the transport phase the tanning agent migrates to the binding sites by diffusion.
- the transport medium is always water, whereby additions of diffusion accelerating chemicals are possible.
- the binding phase usually begins before the transport phase is completed.
- Transport phase and binding phase can be understood in a certain way as "actual" tanning.
- chrome tanning is mainly carried out as so-called chrome tanning, in which salts of trivalent chromium (chromium III), for example chromium sulfate, are used.
- chrome tanning is still the most important tanning agent with a share of 80% and due to its technical advantages and versatility of chrome tanned leather, there is a unanimous opinion among experts that nothing will change in the foreseeable future of the dominant role of chrome tanning.
- Chromium-VI is toxic and therefore an undesirable pollutant
- experts pay special attention to methods for stabilizing Chromium-III against undesired oxidation.
- the object of the present invention was to provide a method for stabilizing chromium-III in chrome-tanned leather. Another object has been to provide substances or compositions which are introduced into the leather during the course of the leather production and which act as stabilizing additives for chromium III.
- gallic acid does an excellent job. It effectively stabilizes Chromium III without negatively affecting the application properties of the leather.
- the present invention firstly relates to the use of gallic acid for stabilizing chromium III against undesired oxidation in chrome-tanned leather.
- Gallic acid has the following chemical structure:
- the gallic acid can be used anywhere in the course of leather production. However, it is preferred to introduce gallic acid into chrome-tanned leather in the course of retanning.
- the amount of gallic acid depends essentially on the amount of chromium present in the leather.
- Gallic acid is preferably used in an amount which is 40 to 50% by weight - total amount of gallic acid based on the trivalent chromium introduced into the leather during tanning, this chromium being calculated as Cr 2 O 3 .
- gallic acid is used in combination with reducing agents.
- Reducing agents are substances that are able to reduce hexavalent chromium to trivalent chromium.
- suitable reducing agents are Na 2 S 2 0 5 , Na 2 S 2 0 3 , layered silicates, Na 2 S0 3 and iron (II) salts.
- the gallic acid is used in combination with radical scavengers.
- Free radical scavengers are substances that are able to bind free radicals. Examples of suitable radical scavengers are vitamin C, vitamin amine E, sterically hindered phenols and the HALS compounds known to the person skilled in the art ("hindered amine light stabilizer).
- Another object of the invention is a method for treating leather, whereby wet blue is treated with gallic acid at any point in the course of further processing to the finished leather - preferably in the course of retanning.
- wet blue familiar to the person skilled in the art is used in the context of the invention for chrome-tanned hides, irrespective of whether one processes these hides directly into ready-to-use leather after their manufacture or whether one obtains commercially available chrome-tanned hides, ie wet blue in the narrower sense processed into ready-to-use leather at a later date.
- the leather thus produced was tested for softness and fullness. The result can be seen in Table 1.
- the leather was aged for 24 hours at 80 ° C and then examined for its chromium VI content.
- the result can also be found in Table 1.
- Example 1 was repeated, but the addition of the gallic acid according to Example 1 was omitted (blank sample). The result can be seen in Table 1.
- Example 1 was repeated, with the following vegetable ones instead of gallic acid
- Tanning agents were used:
- Example 1 according to the invention is - in part very clearly - superior to the comparative examples with regard to the content of chromium VI. Another positive effect is that, with respect to the fullness and softness of the leather, Example 1 according to the invention deviates only insignificantly from Comparison 1, the blank sample.
- the use of vegetable tanning agents (comparisons 2 to 6), on the other hand, shows poorer quality results with the fullness and softness of the leather.
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)
- Fats And Perfumes (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10031548A DE10031548A1 (de) | 2000-06-28 | 2000-06-28 | Verwendung von Gallussäure zur Stabilisierung von Chrom-III gegen Oxidation in chromgegerbtem Leder |
| DE10031548 | 2000-06-28 | ||
| PCT/EP2001/006863 WO2002000941A1 (de) | 2000-06-28 | 2001-06-19 | Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1297188A1 true EP1297188A1 (de) | 2003-04-02 |
| EP1297188B1 EP1297188B1 (de) | 2004-09-15 |
Family
ID=7647123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01964997A Expired - Lifetime EP1297188B1 (de) | 2000-06-28 | 2001-06-19 | Verwendung von gallussäure zur stabilisierung von chrom-iii gegen oxidation in chromgegerbtem leder |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1297188B1 (de) |
| AT (1) | ATE276376T1 (de) |
| BR (1) | BR0111931A (de) |
| DE (2) | DE10031548A1 (de) |
| WO (1) | WO2002000941A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2386702C1 (ru) * | 2009-06-29 | 2010-04-20 | Государственное образовательное учреждение высшего профессионального образования "Санкт-Петербургский государственный университет технологии и дизайна" | Способ дубления шкур |
| US10358686B2 (en) | 2014-08-04 | 2019-07-23 | Citizen Watch Co., Ltd. | Leather or leather article and method for producing same, hexavalent chromium treatment agent, method for treating hexavalent chromium in crude leather or crude leather article |
| EP3594304B1 (de) * | 2017-03-10 | 2021-08-18 | Citizen Watch Co., Ltd. | Pulverförmige zusammensetzung zur sechswertigen chrombehandlung, tablette und verfahren zur herstellung von leder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3935035A (en) * | 1973-06-05 | 1976-01-27 | Nippon Steel Corporation | Aqueous solution and method for surface treatment of metals |
| DE19860610B4 (de) * | 1998-12-29 | 2010-02-18 | Schill + Seilacher Ag | Verfahren zur Inhibierung der Cr(VI)-Bildung in chromgegerbtem Leder und Verwendung von Antioxidantien hierfür |
-
2000
- 2000-06-28 DE DE10031548A patent/DE10031548A1/de not_active Withdrawn
-
2001
- 2001-06-19 BR BR0111931-1A patent/BR0111931A/pt not_active IP Right Cessation
- 2001-06-19 WO PCT/EP2001/006863 patent/WO2002000941A1/de not_active Ceased
- 2001-06-19 EP EP01964997A patent/EP1297188B1/de not_active Expired - Lifetime
- 2001-06-19 DE DE50103652T patent/DE50103652D1/de not_active Expired - Lifetime
- 2001-06-19 AT AT01964997T patent/ATE276376T1/de not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0200941A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE276376T1 (de) | 2004-10-15 |
| EP1297188B1 (de) | 2004-09-15 |
| DE50103652D1 (de) | 2004-10-21 |
| BR0111931A (pt) | 2003-06-17 |
| WO2002000941A1 (de) | 2002-01-03 |
| DE10031548A1 (de) | 2002-01-10 |
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