WO2024038105A1 - Vegetabile extrakte zum gerben - Google Patents
Vegetabile extrakte zum gerben Download PDFInfo
- Publication number
- WO2024038105A1 WO2024038105A1 PCT/EP2023/072603 EP2023072603W WO2024038105A1 WO 2024038105 A1 WO2024038105 A1 WO 2024038105A1 EP 2023072603 W EP2023072603 W EP 2023072603W WO 2024038105 A1 WO2024038105 A1 WO 2024038105A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- tanning
- green tea
- water
- retanning
- extract
- 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.)
- Ceased
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
- C14C3/10—Vegetable tanning
-
- 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
- C14C3/10—Vegetable tanning
- C14C3/12—Vegetable tanning using purified or modified vegetable tanning agents
-
- 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
-
- 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
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
- C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
Definitions
- the invention relates to the use of a tannin-containing product which is obtained by extracting a vegetable tannin-containing material using (i) an aqueous solution or dispersion containing one or more polar organic solvents or (ii) using a supercritical solvent or (iii ) pure water or (iv) a mixture of a supercritical and a polar solvent can be produced or is produced, as described below and in the claims, for tanning and / or retanning hides or skins or their intermediate products resulting from leather production, and /or related subject matter of the invention as set out below and in particular in the examples.
- collagen fibers from animal skin are cross-linked to prevent bacterial or fungal degradation.
- Common tannins are chromium sulfate, glutardialdehyde, vegetable tannins or synthetic tannins.
- the synthetic tanning agents often referred to as synthanes or synonymously as syntans, are usually aldehyde condensation products of aromatic base substances, in particular phenol, cresol, naphthalene and naphthol, which are made solubilized by sulfonation or sulfomethylation.
- Condensates of naphthalenesulfonic acids, phenolsulfonic acid, diphenylsulfones or sulfonated diaryl ethers with formaldehyde and/or urea are particularly preferred.
- Such condensates are known, for example, from Herfeld's (editor) "Library of Leather", Vol. 3, pages 53 to 59, Umschau-Verlag 1984 or Reich, G. Theory and practice of organic tannins, Part 2: Synthetic organic tannins, The Leather , 1996, 157-171, and can be produced using the methods described in the references given there.
- Vegetable tannins are very diverse and usually complicated compounds, which are also referred to as tannins or polyphenols. She occur in almost all plants. There they serve to protect against rot, browsing by game and fungal or mold infestation and can be found in bark (e.g. oak, spruce, mimosa or willow bark), wood (e.g. oak, quebracho or chestnut wood), roots (e.g. badan , Canaigre), leaves (e.g.
- Sumac or Gambir fruits (e.g. Valonea, Trillo, Myobalanen or Tara) and outgrowths (e.g. galls or knobs).
- fruits e.g. Valonea, Trillo, Myobalanen or Tara
- outgrowths e.g. galls or knobs.
- the substances are leached with water to form a tanning broth and have an astringent effect.
- the former contain sugar substances, which can lead to acid formation in the broths due to fermentation, the latter contain poorly soluble large tannin particles (so-called phlobaphenes), which settle as sludge and can then no longer be effective as a tanner.
- the tanner must know very precisely the properties of the tanning agents he is using - each tanning agent behaves differently in terms of solubility, particle size, diffusion, binding, color, fullness, strength, smell, etc.
- a supercritical solvent such as supercritical carbon dioxide, or a mixture of a supercritical and a polar solvent, or in particular an extract of a plant material containing tannins, for example of green tea
- a tanning agent for the liquor a surprisingly very good tanning and/or retanning effect is achieved, which enables the production of leather/tanned skins with very good properties, described in more detail below, and in some cases advantageous results in tanning and retanning compared to known vegetable tanning agents shows and/or requires or has lower concentrations of residue or extract and/or other positive properties.
- the properties may not only be due to the content of polyphenols and/or proanthocyanidins.
- good or improved shrinkage temperature compared to known vegetable tanning agents, better or good penetration (and thus more uniform tanning), better or good levelness (evenness of coloring) and / or a better or good dyeability, a better or good fullness, a better or good softness, a better or good tightness, a better or good grain break, a better or good color intensity or two or more of these properties of the resulting leather or tanned Fells are obtained, compared to leather or skins made with known vegetable tannins such as tara or mimosa.
- a comparable or better classification can be found overall with comparable amounts or concentrations of tannins.
- TS shrinkage temperature
- the shrinkage temperature of an untanned skin is advantageously below 60 °C.
- An increase beyond this e.g. to 65 °C or higher
- the shrinkage temperature is more than 60 °C, for example 65 - 85 °C, depending on the type.
- the other properties mentioned are determined through assessment by specialists and classified qualitatively based on the following values, where "+" means a positive expression and a negative expression of the respective property tested:
- extraction using a mixture of water and one or more polar solvents can even be achieved with the same amount of extract and in particular polyphenol concentration compared to a known vegetable tanning agent (e.g. from Mimosa or especially Tara).
- a known vegetable tanning agent e.g. from Mimosa or especially Tara
- Green tea Green tea
- the tannin-containing products to be used according to the invention advantageously have an enriched proportion of tannins, such as polyphenols, compared to the original vegetable tannin-containing material.
- polyphenols can be determined using a Folin/Ciocalteu assay, the sugar content using a phenol-sulfuric assay and the proanthocyanidin content using an acid-butanol assay according to SOPs from the Bern University of Applied Sciences in Bern (Biel, Switzerland) with the aid of UV/VIS spectroscopy .
- the invention relates to the use of a tannin-containing product, which is obtained by extracting a plant-based tannin-containing product
- a mixture of a supercritical and a polar solvent can be produced or is produced in the form of a residue from the extraction, for tanning and/or retanning of hides or skins or their intermediate products resulting from leather production.
- the tannin-containing product to be used is one according to variant (i) Available or obtained extract in liquid or dried form of the aqueous dispersion or in particular solution containing one or more polar organic solvents.
- the tannin-containing product to be used is a solid or dispersed residue, in particular “pomace”, obtainable or obtained according to one of variants (ii) or (iii), from an extraction with pure Water or especially with a supercritical solvent.
- phenolic compounds in particular polyphenols and/or proanthocyanidins, are present as tannins in the tannin-containing product to be used.
- the tannin-containing product to be used is an extract of green tea in liquid or dried form, which is the product of an extraction using an aqueous containing one or more polar organic solvents Dispersion or in particular solution, includes or is in particular.
- the green tea extract is preferably used for retanning intermediate products resulting from hides or skins in leather production, characterized in that the intermediate product or products is a material resulting from the pick, in particular nakedness, and this intermediate product is a Tanning or tanning with subsequent retanning using green tea extract.
- the intermediate product or products is, for example, a material obtainable after a first tanning step, in particular Wet White, Wet Brown or Wet Blue, with this material being retanned using green tea extract.
- one or the extract of green tea can be added to the respective liquor in solid, for example granular or in particular powdered form, to a liquor for tanning or retanning.
- a further embodiment of the invention provides that a green tea extract is added to one or the respective liquor in liquid form, in particular as an aqueous-ethanolic solution.
- a polar solvent is to be understood as meaning one which is miscible with water and which consists of alcohol, in particular methanol, ethanol, propanol or Isopropanol, a diol, in particular ethylene glycol, diethylene glycol or triethylene glycol, a ketone, in particular acetone or methyl ethyl ketone, a di-lower alkyl sulfoxide, in particular dimethyl sulfoxide or diethyl sulfoxide, a nitrile, such as acetonitrile, a water-soluble ether, such as dioxane or tetrahydrofuran, an amide, such as formamide, N-methylformamide, dimethylformamide or diethylf ormamide, and a heterocyclic solvent such as piperidine or N-methyl-2-pyrrolidone, or a mixture of two or more thereof.
- alcohol in particular methanol, ethanol, propanol or Isoprop
- the invention relates in a further embodiment to one which is selected from nitrous oxide, sulfur dioxide, a fluorocarbon or, in particular, carbon dioxide; a mixture of polar organic solvent and supercritical solvent is also possible.
- the invention relates to a use in which the extract of green tea is one in which 100 to 300 parts of green tea are mixed with 300 to 900 parts of water and 200 to 600 parts (each based on weight) of the polar solvent, in particular ethanol, were used to prepare the extract.
- the polar solvent in particular ethanol
- the ratio of the weights of green tea to water to polar solvent, in particular ethanol is advantageously (10-30): (40-60): (25-40), preferably such that the sum the ratios are one hundred.
- a special embodiment of the invention also relates to a tanning agent and/or material for retanning, comprising a tanning agent-containing product that can be produced or produced as defined in the above embodiments, in particular for tanning and/or retanning hides or skins or their intermediate products resulting from leather production.
- the tanning agent and/or retanning material i.e. the corresponding material
- a further embodiment of the invention relates to a method for vegetable tanning and/or retanning, characterized in that a tanning agent-containing product produced according to one of the above embodiments, or a tanning agent and/or material for retanning according to the last paragraph, a skin, a nakedness or, in the case of retanning, a material that has already been tanned from the materials mentioned is added in an aqueous solution or dispersion with or without further additives and the approach is for a longer period of time, for example 0.1 to 5 days, for example 0.5 to 3 days , preferably while moving, is incubated.
- the extraction with water and one or more polar (organic) solvents preferably takes place by using a tannin-containing plant material, for example bark (e.g. oak, spruce, mimosa or willow bark), woods (e.g. oak, quebracho or chestnut wood ), roots (e.g. Badan, Canaigre) , stems, leaves or petals (e.g Sumac or Gambir or in particular green tea from Camellia sinensis or also assamica), fruits (e.g. Valonea, Trillo, Myobalanen or Tara) or growths (e.g. Gallen or Knoppern) or seeds, which are in unaltered or in dried, not crushed or crushed ( e.g. chopped or ground) form can be extracted.
- a tannin-containing plant material for example bark (e.g. oak, spruce, mimosa or willow bark), woods (e.g. oak, quebracho or chestnut wood ), roots (e.g. Badan, Canai
- the extractant mixture of water and one or more polar solvents
- the extracts obtainable or obtained in this way can, if necessary after filtering off solid components, after further dilution or as such or in concentrated liquid form by partial extraction of the extractant (for example by distillation or evaporation, in each case with or without suppression), or after complete drying (for example by Evaporation of the extractant, spray drying, fluidized bed process, freeze drying or the like) in dried form, for example as solid masses, granules or (in particular after grinding) as powder, obtained and stored (e.g. with cooling) and later added to the respective liquor during tanning or retanning .
- the residues after an extraction with water or with a supercritical solvent as an extractant are obtained analogously by converting the soluble components of the tannin (e.g. tannin)-containing plant material into solution with the extractant and then discarding the remaining Residue is used as a base for a tanning agent.
- Tanning with an extract (or a residue) to be used according to the invention is carried out according to customary processes, for example in a process for tanning and/or retanning of hides and/or skins, in particular of pelts, or in the case of retanning of pre-tanned hides and/or Skins, in a fleet, comprising the steps:
- Usual post-treatment steps can follow, such as: Loosening, turning, jacking up, aligning, drying (e.g. in a vacuum), lining or fulling.
- CORIPOL® SLG - Anionic greasing agent for all soft and tight-grain leather items, based on a combination of natural and synthetic fats
- Example 1 Green tea extract production with water or water/ethanol mixtures a) Extract with water:
- Example 2 Importance of ethanol in the extraction of green tea for the effectiveness as a tanning agent using the example of a liquid
- the extract produced according to the invention with ethanol/water showed surprisingly clear advantages in terms of the tanning effect (high TS) and high levelness. Extraction with ethanol/water improved tanning performance. Adding ethanol to aqueous green tea extract did not show any improvements, so the higher tanning effect depends on the extraction with ethanolic water, not just the ethanol content in the liquor.
- Example 3 Tanning in comparison with Mimosa extract as a powder
- Example 4 Retanning of a leather tanned with glutaraldehyde with green tea extract powder (extracted with ethanol/water)
- NEUTRALI- 150 water 30 °C
- Example 6 Tanning to produce a vegetable leather
- Tara is a plant tannin that comes from the small tara tree
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
Description
Claims
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202380060704.5A CN120129758A (zh) | 2022-08-19 | 2023-08-16 | 用于鞣制的植物提取物 |
| EP23758296.0A EP4573220A1 (de) | 2022-08-19 | 2023-08-16 | Vegetabile extrakte zum gerben |
| KR1020257004896A KR20250086589A (ko) | 2022-08-19 | 2023-08-16 | 태닝용 식물성 추출물 |
| MX2025001513A MX2025001513A (es) | 2022-08-19 | 2025-02-06 | Extractos vegetales para curtir |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022121017.0 | 2022-08-19 | ||
| DE102022121017.0A DE102022121017A1 (de) | 2022-08-19 | 2022-08-19 | Vegetabile Extrakte zum Gerben |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024038105A1 true WO2024038105A1 (de) | 2024-02-22 |
Family
ID=87762737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2023/072603 Ceased WO2024038105A1 (de) | 2022-08-19 | 2023-08-16 | Vegetabile extrakte zum gerben |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP4573220A1 (de) |
| KR (1) | KR20250086589A (de) |
| CN (1) | CN120129758A (de) |
| DE (1) | DE102022121017A1 (de) |
| MX (1) | MX2025001513A (de) |
| WO (1) | WO2024038105A1 (de) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19615436A1 (de) * | 1996-04-19 | 1997-12-11 | Nig Nahrungs Ingenieurtechnik | Verfahren zur Gewinnung von Gerbstoffen aus Polygonaceae als nachwachsende Rohstoffe sowie die Verwendung dieser Gerbstoffe als Ledergerbstoffe |
| EP2110446A1 (de) * | 2008-04-18 | 2009-10-21 | C & J Clark International Limited | Gerbung von Fellen und Häuten |
| CN110819745A (zh) * | 2019-11-29 | 2020-02-21 | 明新旭腾新材料股份有限公司 | 一种利用天然茶叶改善真皮制品气味的方法 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2659791B1 (de) | 2002-10-28 | 2017-08-02 | Kao Corporation | Koffeinhaltige Catechinverbindungszusammensetzung |
| MX2008012065A (es) | 2006-03-23 | 2008-10-07 | Herbalscience Singapore Pte Ltd | Extractos y metodos que comprenden especies de te verde. |
| GB201306607D0 (en) | 2013-04-11 | 2013-05-29 | Xeros Ltd | Method for treating an animal substrate |
-
2022
- 2022-08-19 DE DE102022121017.0A patent/DE102022121017A1/de active Pending
-
2023
- 2023-08-16 WO PCT/EP2023/072603 patent/WO2024038105A1/de not_active Ceased
- 2023-08-16 EP EP23758296.0A patent/EP4573220A1/de active Pending
- 2023-08-16 CN CN202380060704.5A patent/CN120129758A/zh active Pending
- 2023-08-16 KR KR1020257004896A patent/KR20250086589A/ko active Pending
-
2025
- 2025-02-06 MX MX2025001513A patent/MX2025001513A/es unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19615436A1 (de) * | 1996-04-19 | 1997-12-11 | Nig Nahrungs Ingenieurtechnik | Verfahren zur Gewinnung von Gerbstoffen aus Polygonaceae als nachwachsende Rohstoffe sowie die Verwendung dieser Gerbstoffe als Ledergerbstoffe |
| EP2110446A1 (de) * | 2008-04-18 | 2009-10-21 | C & J Clark International Limited | Gerbung von Fellen und Häuten |
| CN110819745A (zh) * | 2019-11-29 | 2020-02-21 | 明新旭腾新材料股份有限公司 | 一种利用天然茶叶改善真皮制品气味的方法 |
Non-Patent Citations (3)
| Title |
|---|
| PRAXIS DER ORGANISCHEN GERBSTOFFE: "Synthetische organische Gerbstoffe", DAS LEDER, vol. 2, 1996, pages 157 - 171 |
| REICH, G. THEORIE: "Bibliothek des Leders", vol. 3, 1984, UMSCHAU-VERLAG, pages: 53 - 59 |
| SIEHE Z.B. G. MOOGDER GERBER, PROFESSIONELLE LEDERHERSTELLUNG, 2016 |
Also Published As
| Publication number | Publication date |
|---|---|
| MX2025001513A (es) | 2025-07-01 |
| DE102022121017A1 (de) | 2024-02-22 |
| KR20250086589A (ko) | 2025-06-13 |
| EP4573220A1 (de) | 2025-06-25 |
| CN120129758A (zh) | 2025-06-10 |
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