CH463685A - Process for impregnating natural and artificial leathers - Google Patents
Process for impregnating natural and artificial leathersInfo
- Publication number
- CH463685A CH463685A CH399364A CH399364A CH463685A CH 463685 A CH463685 A CH 463685A CH 399364 A CH399364 A CH 399364A CH 399364 A CH399364 A CH 399364A CH 463685 A CH463685 A CH 463685A
- Authority
- CH
- Switzerland
- Prior art keywords
- fatty acid
- blown
- parts
- aqueous preparation
- salt
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/651—Compounds without nitrogen
- D06P1/65106—Oxygen-containing compounds
- D06P1/65125—Compounds containing ester groups
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0061—Organic fillers or organic fibrous fillers, e.g. ground leather waste, wood bark, cork powder, vegetable flour; Other organic compounding ingredients; Post-treatment with organic compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
- D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
- D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
- D06N3/0065—Organic pigments, e.g. dyes, brighteners
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/653—Nitrogen-free carboxylic acids or their salts
- D06P1/6533—Aliphatic, araliphatic or cycloaliphatic
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/90—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof
- D06P1/92—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof in organic solvents
- D06P1/922—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using dyes dissolved in organic solvents or aqueous emulsions thereof in organic solvents hydrocarbons
- D06P1/926—Non-halogenated hydrocarbons
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/24—Polyamides; Polyurethanes
- D06P3/241—Polyamides; Polyurethanes using acid dyes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
- D06P3/324—Material containing basic nitrogen containing amide groups leather skins using basic dyes
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
- D06P3/3286—Material containing basic nitrogen containing amide groups leather skins using reactive dyes
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Coloring (AREA)
Description
Verfahren zum Imprägnieren natürlicher und künstlicher Leder Beim Imprägnieren, z.B. Färben oder Bedrucken, von Leder verwendet man häufig wässrige Farbstoffzuberei- tungen, die oberflächenaktive Mittel, organische Lö sungsmittel oder andere Hilfsstoffe enthalten. Es besteht der Wunsch, diese Farbstoffzubereitungen durch Bürsten, Spritzen oder Giessen aufzutragen, doch dringt der Farbstoff dabei nicht genügend tief in das Leder ein und man erhält ungleichmässige und nicht genügend echte Färbungen.
Es wurde gefunden, dass diese Nachteile vermieden werden, wenn man Leder mit einer wässrigen Zuberei tung, vorzugsweise Farbstoffzubereitung, imprägniert, die ein wasserlösliches Salz einer geblasenen Fettsäure ent hält. Mit diesem Verfahren lassen sich alle natürlichen Leder imprägnieren, z.B. Narbenleder, geschliffenes oder gespaltenes Leder oder Velourleder und die Fleischseite von gegerbten Fellen, sowie künstliche Leder, z.B. solche aus Polyestermaterial, wie Corfam (eingetragene Schutzmarke), vgl. deutsche Auslegeschrift Nr.<B>1109</B> 640. Es ist nicht an die Verwendung bestimmter Farbstoffe oder Chemikalien gebunden.
Vielmehr lassen sich alle bekannten, in der Lederbehandlung üblichen Farbstoffe, Chemikalien, Weichmacher usw. verwenden. Als Farb stoffe kommen insbesondere Dis- oder Trisazofarbstoffe oder Metallkomplexfarbstoffe in Betracht, wobei verhält- nismässig gut wasserlösliche Vertreter dieser Gruppen, z.B. solche, von denen mindestens 15 g in einem Liter Wasser löslich sind, bevorzugt sind.
Geblasene Fettsäuren sind bekanntlich bei erhöhter Temperatur mit Luftsauerstoff behandelte natürliche, ungesättigte Fettsäuren, das sind höhermolekulare ali- phatische Carbonsäuren mit mindestens einer olefini- schen Doppelbindung, die etwa 12 bis 28 und insbesonde re 14 bis 18 Kohlenstoffatome enthalten. Mit besonderem Vorteil werden Salze aus geblasenen Ricinusölfettsäuren und Ammoniak oder organischen Aminen eingesetzt.
Diese Salze wendet man vorzugsweise in Mengen zwi schen ungefähr 10 und 800 g und insbesondere zwischen 40 und 400 g je 1 Liter Zubereitung an.
Die verwendeten Zubereitungen können zusätzliche Hilfsmittel enthalten. Mit besonders gutem Erfolg ver wendet man ein oder mehrere organische Lösungsmittel und/oder kleine Mengen anionaktiver oder nicht ionoge- ner Netz- und/oder Dispergiermittel, sowie Fettstoffe, Gerbstoffe, wie natürliche und synthetische Fettstoffe oder Gerbstoffe, ferner Kunstharzdispersionen, Verdik- kungsmittel. Als organische Lösungsmittel kommen vor allem flüssige, gesättigte Kohlenwasserstoffe,
z.B. flüssige Erdölfraktionen, in Betracht. Ferner sind Glykole geeig net, z.B. Äthylenglykol oder Hexylenglykol oder deren Äther, z.B. der Äthylenglykolmonomethyläther oder der Äthylenglykolmonoäthyläther, andere Glykolderivate oder drei- und mehrwertige Alkohole,
z.B. Sorbit. Als zusätzliche Netz- oder Dispergiermittel dienen mit beson derem Vorteil sulfoniertes Ricinusöl oder polyoxäthylier- te Phenole und Alkylphenole oder höhermolekulare Alkohole. 20 g/1 übersteigende Mengen flüssiger Erdöl fraktionen ergeben im allgemeinen keine zusätzlichen Vorteile. Von Glykolen kann man z.B. 10 bis 200 g und vorzugsweise 30 bis 150 g je Liter Zubereitung verwen den.
Ferner lassen sich z.B. Kunstharzbindemittel, Auf hellungsmittel, Verdickungsmittel, Fette oder Gerbstoffe mitverwenden. Der pH-Wert dieser Flotten oder Pasten beträgt im allgemeinen 6 bis 12 und vorzugsweise 7 bis 11. Ihre Temperatur kann normal oder erhöht sein. Das Auftragen kann z.B. durch Bürsten (Plüschen), Rollen, Spritzen oder Giessen, z.B. mit Hilfe einer üblicherweise für das Imprägnieren oder Beschichten von Leder und Kunststoffolien verwendeten Giessmaschine, erfolgen.
Das imprägnierte Leder wird in bekannter Weise bei Raumtemperatur oder bei erhöhter Temperatur getrock net und fertiggestellt.
Die in den Beispielen genannten Teile sind Gewichts teile und die Prozente Gewichtsprozente. Die Temperatu ren sind in Celsiusgraden angegeben.
<I>Beispiel 1</I> Man stellt ein Gemisch aus 62,5 Teilen geblasener Ricinusölfettsäure mit der Säurezahl 100, 12,5 Teilen Morpholin, 5 Teilen des Hilfsmittels aus dem Beispiel 25 der französischen Patentschrift Nr.<B>1312787,</B> 60 Teilen Hexylenglykol, 40 Teilen Äthylenglykol, 10 Teilen Pe- trol , einer geruchlosen Erdölfraktion, 5 Teilen 25%iger wässriger Ammoniaklösung und 10 Teilen einer 70%igen wässrigen Sorbitlösung her.
Von dieser Mischung, die den pH-Wert 8,8 hat, werden<B>150</B> Teile mit 38 Teilen des Farbstoffs des Beispiels 1 der französischen Patentschrift Nr.<B>1073</B> 728 und 812 Teilen Wasser vermischt.
Mit dieser Flotte vom pH-Wert 9,4 wird gegerbtes und getrocknetes, vollnarbiges Leder imprägniert. Hier auf wird 24 Stunden bei Raumtemperatur gelagert, getrocknet und wie üblich zugerichtet, z.B. mit Hilfe einer Bügel- oder Glanzstossmaschine.
Der Farbstoff ist tief in das Leder eingedrungen. Die erhaltene Färbung ist sehr egal, kratz- und scheuerfest, lichtecht, reibecht, schleifecht und formaldehyd- und säurebeständig. Das gefärbte Leder kann ohne weiteres mit Pigmentdispersionen behandelt werden.
<I>Beispiel 2</I> Man stellt ein Gemisch aus 62,5 Teilen geblasener Ricinusölfettsäure mit der Säurezahl 100, 12,5 Teilen Morpholin, 5 Teilen des Hilfsmittels aus dem Beispiel 25 der französischen Patentschrift Nr.<B>1312787,</B> 60 Teilen Hexylenglykol, 40 Teilen Äthylenglykol, 10 Teilen < cPe- trol , einer geruchlosen Erdölfraktion, 5 Teilen 25a/oiger wässriger Ammoniaklösung und 10 Teilen einer 70%igen wässrigen Sorbitlösung.
Von dieser Mischung, die den pH-Wert 8,8 hat, werden 125 Teile mit 20 Teilen des Farbstoffes des Beispiels 1 der französischen Patentschrift Nr.<B>1073</B> 728 und 855 Teilen Wasser vermischt. Mit dieser Flotte vom pH-Wert 9,2, wird im Formkörper, wie er im Beispiel 1 der deutschen Auslegeschrift Nr. 1 109 640 beschrieben wird, imprägniert.
Der Formkörper wird hierauf bei Raumtemperatur während 5 Stunden gelagert, getrocknet und wie bei Leder üblichen Massnahmen zugerichtet. Eine Trock nung bei 95 während mehreren Minuten verbessert die Fixierung des Farbstoffes.
Der Farbstoff ist tief und gleichmässig in den Form körper eingedrungen; er ist vollständig durchfärbt. Man erhält eine egale und satte Braunfärbung. Die Wasser dampfdurchlässigkeit, die Flexibilität, die Formbestän- digkeit und Zurichtbarkeit mit Pigmentdispersionen des Formkörpers wird nicht beeinträchtigt.
Process for the impregnation of natural and artificial leathers When impregnating, e.g. Dyeing or printing, leather is often used in aqueous dye preparations containing surface-active agents, organic solvents or other auxiliaries. There is a desire to apply these dyestuff preparations by brushing, spraying or pouring, but the dyestuff does not penetrate deep enough into the leather and uneven and not sufficiently true dyeings are obtained.
It has been found that these disadvantages are avoided if leather is impregnated with an aqueous preparation, preferably a dye preparation, which contains a water-soluble salt of a blown fatty acid. With this method all natural leathers can be impregnated, e.g. Grain leather, sanded or split leather or suede and the flesh side of tanned hides, as well as artificial leather, e.g. those made of polyester material, such as Corfam (registered trademark), cf. German Auslegeschrift no. <B> 1109 </B> 640. It is not tied to the use of specific dyes or chemicals.
Rather, all known dyes, chemicals, plasticizers, etc. that are common in leather treatment can be used. Particularly suitable dyes are disazo or trisazo dyes or metal complex dyes, with representatives of these groups being relatively well soluble in water, e.g. those of which at least 15 g are soluble in one liter of water are preferred.
As is known, blown fatty acids are natural, unsaturated fatty acids treated with atmospheric oxygen at elevated temperature, that is, higher molecular weight aliphatic carboxylic acids with at least one olefinic double bond which contain about 12 to 28 and in particular 14 to 18 carbon atoms. Salts of blown castor oil fatty acids and ammonia or organic amines are used with particular advantage.
These salts are preferably used in amounts between approximately 10 and 800 g and in particular between 40 and 400 g per 1 liter of preparation.
The preparations used can contain additional auxiliaries. One or more organic solvents and / or small amounts of anionic or nonionic wetting agents and / or dispersants, as well as fatty substances, tanning agents such as natural and synthetic fatty substances or tanning agents, and also synthetic resin dispersions, thickeners are used with particularly good success. The main organic solvents are liquid, saturated hydrocarbons,
e.g. liquid petroleum fractions. Glycols are also suitable, e.g. Ethylene glycol or hexylene glycol or their ethers, e.g. ethylene glycol monomethyl ether or ethylene glycol monoethyl ether, other glycol derivatives or tri- and polyhydric alcohols,
e.g. Sorbitol. Sulfonated castor oil or polyoxyethylated phenols and alkylphenols or higher molecular weight alcohols serve with particular advantage as additional wetting or dispersing agents. Quantities of liquid petroleum fractions exceeding 20 g / 1 generally do not provide any additional advantages. Glycols can e.g. 10 to 200 g and preferably 30 to 150 g per liter of preparation use the.
Furthermore, e.g. Use synthetic resin binders, brighteners, thickeners, fats or tannins. The pH of these liquors or pastes is generally 6 to 12 and preferably 7 to 11. Their temperature can be normal or elevated. The application can e.g. by brushing (plush), rolling, spraying or pouring, e.g. with the aid of a casting machine usually used for the impregnation or coating of leather and plastic films.
The impregnated leather is net getrock and finished in a known manner at room temperature or at an elevated temperature.
The parts mentioned in the examples are parts by weight and the percentages are percentages by weight. The temperatures are given in degrees Celsius.
<I> Example 1 </I> A mixture of 62.5 parts of blown castor oil fatty acid with an acid number of 100, 12.5 parts of morpholine and 5 parts of the auxiliary from example 25 of French patent specification no. 1312787, <is prepared / B> 60 parts of hexylene glycol, 40 parts of ethylene glycol, 10 parts of petrol, an odorless petroleum fraction, 5 parts of 25% strength aqueous ammonia solution and 10 parts of a 70% strength aqueous sorbitol solution.
From this mixture, which has a pH value of 8.8, <B> 150 </B> parts with 38 parts of the dye of Example 1 of French Patent Specification No. 1073 </B> are 728 and 812 parts of water mixed.
This liquor with a pH of 9.4 is used to impregnate tanned and dried, full-grain leather. Here it is stored for 24 hours at room temperature, dried and trimmed as usual, e.g. with the help of an ironing or polishing machine.
The dye has penetrated deep into the leather. The coloring obtained is very unimportant, scratch and scuff resistant, lightfast, rubfast, abrasive resistant and formaldehyde and acid resistant. The dyed leather can easily be treated with pigment dispersions.
<I> Example 2 </I> A mixture of 62.5 parts of blown castor oil fatty acid with an acid number of 100, 12.5 parts of morpholine and 5 parts of the auxiliary from example 25 of French patent specification no. 1312787, <is prepared / B> 60 parts of hexylene glycol, 40 parts of ethylene glycol, 10 parts of <cPetrol, an odorless petroleum fraction, 5 parts of 25% aqueous ammonia solution and 10 parts of a 70% strength aqueous sorbitol solution.
From this mixture, which has a pH of 8.8, 125 parts are mixed with 20 parts of the dye of Example 1 of French Patent Specification No. 1073 728 and 855 parts of water. This liquor with a pH of 9.2 is used to impregnate the molding as described in Example 1 of German Auslegeschrift No. 1 109 640.
The shaped body is then stored at room temperature for 5 hours, dried and finished as usual with leather. Drying at 95 for several minutes improves the fixation of the dye.
The dye has penetrated deeply and evenly into the mold; it is completely colored. A level and deep brown color is obtained. The water vapor permeability, flexibility, dimensional stability and adjustability with pigment dispersions of the molding are not impaired.
Claims (1)
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL129551D NL129551C (en) | 1964-04-06 | ||
CH399364A CH463685A (en) | 1964-04-06 | 1964-04-06 | Process for impregnating natural and artificial leathers |
CH432864A CH479764A (en) | 1964-04-06 | 1964-04-06 | Process for dyeing non-textile moldings |
DE19641519493 DE1519493A1 (en) | 1963-08-02 | 1964-07-31 | Process for dyeing or printing leather |
CH241265A CH476155A (en) | 1964-04-06 | 1965-02-23 | Process for dyeing or printing plastic films |
DE19651519495 DE1519495A1 (en) | 1964-04-06 | 1965-03-02 | Process for coloring or printing plastic films |
GB10585/65A GB1100371A (en) | 1964-04-06 | 1965-03-12 | Process for dyeing or printing sheets or films formed form plastics materials in themass and composite materials obtained from such sheets or films |
BE661407D BE661407A (en) | 1964-04-06 | 1965-03-19 | |
NL6503750A NL6503750A (en) | 1964-04-06 | 1965-03-24 | |
ES0310921A ES310921A1 (en) | 1964-04-06 | 1965-03-24 | Procedure for dyeing or printing of synthetic material sheets. (Machine-translation by Google Translate, not legally binding) |
FR10750A FR1431316A (en) | 1964-04-06 | 1965-03-25 | Process for dyeing or printing plastic films |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH399364A CH463685A (en) | 1964-04-06 | 1964-04-06 | Process for impregnating natural and artificial leathers |
Publications (1)
Publication Number | Publication Date |
---|---|
CH463685A true CH463685A (en) | 1968-10-15 |
Family
ID=4267800
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH399364A CH463685A (en) | 1963-08-02 | 1964-04-06 | Process for impregnating natural and artificial leathers |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH463685A (en) |
-
1964
- 1964-04-06 CH CH399364A patent/CH463685A/en unknown
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