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
• • 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
  • D06P1/60—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 polyethers
  • D06P1/613—Polyethers without nitrogen
  • D06P1/6131—Addition products of hydroxyl groups-containing compounds with oxiranes
  • D06P1/6135—Addition products of hydroxyl groups-containing compounds with oxiranes from aromatic alcohols or from phenols, naphthols
• • 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

Definitions

• the invention relates to a pigment dyeing process which can be applied to chrome-moist leather (wet blue) or intermediate-dried (crusted) leather and to leather of all animal species.
• Pigment dyeings of leather have been known for a long time. The first such dyeings were obtained by rubbing insoluble colored pigment particles (marble dust, soot, clay) into the leather. Pigment dyeings are still of interest today, e.g. Titanium dioxide is used to enhance the tanning of white after retanning or after the leather has dried. Soot is also occasionally used to deepen the shade.
• insoluble colored pigment particles marble dust, soot, clay
• the deficient bond of the pigment to the leather has a disadvantageous effect in the pigment dyeings common today. This results in insufficient fixation and poor wet and dry abrasion values.
• a leather treated with pigments is usually not completely colored.
• the dyeing of leather with soluble dyes also has some disadvantages. Depending on the dye, lower light, sweat or migration fastness values are obtained. Problems with insufficient fastness to wet and / or dry rubbing are also known here.
• the leather can be dyed through, the lightfastness values of the leather are better than those of the leather dyed with dyes.
• the fastness to wet and dry rubbing is established, the fastness to migration is good (no migration), the fastness to sweat is excellent, minor grain defects of the leather can be covered, the leather is colored regardless and does not change its grip.
• the working methods correspond to the usual dyeing methods, so that no major changes in the operational sequence are necessary for the implementation of this method.
• R1 is hydrogen
• R2 and R3 are hydrogen or alkyl having 1 to 12 carbon atoms, advantageously 1 to 9 carbon atoms
• R hydrogen and / or alkyl having 1 to 4 carbon atoms advantageously hydrogen
• n is a number from 2 to 20, suitably 8 to
• m is a number from 4 to 10, suitably 4 to 8
• M is hydrogen, an alkali metal, suitably sodium, an equivalent of alkaline earth metal and / or an ammonium group which can be substituted by lower alkyl and / or lower hydroxyalkyl can be substituted, as well as an ammonium group obtained from ammonia or lower alkylamines by addition of up to 150, advantageously from 5 to 30, ethylene oxide and / or propylene oxide units.
• These compounds are prepared by using novolak oxalkylates of the formula I, in which A is hydrogen and Ar, X, R 1, R 2, R 3, R, n and m have the meaning given above, with 1 to m mol of a benzoyl and / or O-acylating compound introducing naphthoyl and treated with 1 to m mol of maleic anhydride and optionally 1 to m mol of sulfite or hydrogen sulfite or 0.5 to 0.5 m mol of disulfite and, if appropriate, neutralizing free acid groups with a base introducing the rest of M.
• the pigment dispersions can also contain lecithin as a further dispersant.
• aqueous pigment dispersions can be prepared in a known manner by the pigments, e.g. Azo pigments, lacquered azo pigments, triphenylmethane pigments, thioindigo pigments, perylene tetracarboxylic acid pigments, dioxazine pigments, quinacridone pigments, phthalocyanine pigments or inorganic pigments with these dispersants with the addition of ethylene glycol, water and, if appropriate, small quantities of other dispersing agents, a dispersing agent, a dispersing agent, for example, a dispersing agent, such as a dispersing agent .
• a dispersing agent e.g. Azo pigments, lacquered azo pigments, triphenylmethane pigments, thioindigo pigments, perylene tetracarboxylic acid pigments, dioxazine pigments, quinacridone pigments, phthalocyanine pigments or inorganic pigments
• the ratio of distribution agents to pigment powder can vary within wide limits and is generally 0.1 to 0.2 parts by weight of dispersant to one part of dry pigment powder.
• the compounds of the formula (I) mentioned can also be used as coupling aids.
• the amount of lecithin is 0.05 to 0.25% by weight, based on the pigment powder.
• the dispersions of pigment powder and compounds of the formula 1 were prepared in the presence of water and are obtained in the form of doughs which can be used in this form in the process according to the invention. However, these water-containing dispersions can also be dried. The powder thus obtained is also suitable for dyeing leather in the process according to the invention.
• the term dispersion here and below includes both the water-based dispersions and the water-free powders.
• the leather is first broached by conventional methods, for example with about 2% conc. Ammonia solution and 0.1 to 2, preferably 0.2 to 0.5% of a wetting agent, based on the dry weight of the leather.
• Suitable wetting agents for this stage are, for example, polyethylene glycols with a molecular weight of 100 to 2000, preferably from 200 to 1000, esters of the formula R1-COO- (CH2) n -SO3Na, where R1 is C8-C25-, preferably C12-C18-alkyl and n are numbers from 1 to 12, preferably 2 to 5, or ethoxylated fatty alcohols, fatty acids, fatty acid amides, sec. Alkanesulfonates, phenol, naphthol and alkylphenols containing 1 to 100, preferably 3 to 20, oxyethylene units.
• the leather is rinsed and placed in a fresh ammoniacal liquor. This is followed by a treatment that serves to introduce substances into the leather that fix the subsequent pigmentation. This treatment is called "pre-fixation” below.
• Water-soluble polyurethanes and condensation products of formaldehyde with melamine (molar ratio 3: 1 to 12: 1, preferably 4: 1 to 6: 1), dicyandiamide (molar ratio 1: 1 to 3: 1), urea (molar ratio 1: 1) are suitable for pre-fixing to 3: 1, preferably 1.5: 1 to 2.8: 1), phenol (molar ratio 0.5: 1 to 2: 1), naphthol (molar ratio 0.5: 1 to 2: 1) and aromatic sulfonic acids, preferably naphthalenesulfonic acid (molar ratio 3: 1 to 12: 1, preferably 5: 1 to 8: 1).
• condensation products in their sulfonated form are suitable for pre-fixing.
• the amount of such condensation products is about 0.2 to 4, preferably 1.5 to 2.5%, based on the shaved weight of the leather and about 0.3 to 5, preferably 1 to 3%, based on the dry weight of the leather .
• the actual pigment coloring takes place in the same liquor. This step requires the use of substances that allow the pigments to be evenly applied to the leather (leveling agent).
• Possible wetting agents are the wetting agents previously described for the brochure and also lecithin and condensation products from protein hydrolyzates with a molecular weight of approximately 100 to 10,000, preferably 300 to 3000 and C6-C30-, preferably C8-C18 fatty acids. These leveling agents are used in amounts of 0.1 to 3%, preferably 0.8 to 1.2%, based on the shaved weight of the leather and 0.5 to 2, preferably 0.8 to 1.5, based on the dry weight of the leather used.
• the liquor also contains the pigment which has been treated with the dispersants described at the outset and in which the pigment is present in an average particle size of 50 to 500, preferably 80 to 300 nm.
• the amount of pigment dispersion is 0.5 to 3, preferably 1 to 2%, based on both the shaved weight and the dry weight of the leather.
• a short liquor approximately 30 to 300% and temperatures of 20 to 40 ° C are used.
• the leather thus dyed can then be greased using known methods. After the oiling or immediately after pigment coloring, the pigments are fixed and refixed. Both fixation as Post-fixation is also carried out by treating the leather by known methods with an organic acid, for example with formic acid or acetic acid or glycol formate. The amount of these acids is approximately 2 to 5%, preferably 2 to 4%, based on the shaved weight of the leather or 5 to 8%, preferably 4 to 6%, based on the dry weight of the leather.
• the molecular weights of these polymers are in the range from 100 to 10,000, preferably from 150 to 3000.
• the amount of these auxiliaries is 1 to 4, preferably 1.5 to 2.5%, based on the shaved weight of the leather or 1 to 6, preferably 2 to 3%, based on the dry weight of the leather.
• the actual post-pigmentation is carried out in the same way as the first pigmentation described above with 0.5 to 4, preferably 1.5 to 3% pigment, based on the shaved weight of the leather, or with 1 to 4, preferably 1.5 to 3% on the dry weight of the leather.
• the same leveling agents are also used in this postpigmentation in the same amount as before in the first pigmentation. After post-pigmentation is fixed and post-fixed, as described above.
• the previously described workflow relates to intermediate-dried leather.
• the brochure is not required for the bath pigmentation of folded leather. Instead, the leather is rinsed, neutralized and rinsed again before the bath pigmentation. After the bath pigmentation, but before any greasing, the leather is retanned. In all processes, it is also possible to additionally dye the leather with soluble dyes by known methods. This can be done before the bath pigmentation, after the bath pigmentation or after the fixation.
• the leathers are finished in the normal way.
• the leathers are finished in the normal way.
• the leathers are finished in the normal way.
• the leathers are finished in the normal way.
• the leathers are finished in the normal way

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• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Coloring (AREA)
• Treatment And Processing Of Natural Fur Or Leather (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=6358630

Family Applications (1)

Country Status (11)

Cited By (1)

Families Citing this family (10)

Family Cites Families (3)

• 1988
  • 1988-07-14 DE DE3823826A patent/DE3823826A1/de not_active Withdrawn
• 1989
  • 1989-07-07 DE DE58907676T patent/DE58907676D1/de not_active Expired - Fee Related
  • 1989-07-07 EP EP89112426A patent/EP0350803B1/de not_active Expired - Lifetime
  • 1989-07-07 ES ES89112426T patent/ES2055760T3/es not_active Expired - Lifetime
  • 1989-07-12 PT PT91142A patent/PT91142B/pt not_active IP Right Cessation
  • 1989-07-12 AR AR89314382A patent/AR246770A1/es active
  • 1989-07-12 US US07/379,574 patent/US4914764A/en not_active Expired - Fee Related
  • 1989-07-13 CA CA000605573A patent/CA1334045C/en not_active Expired - Fee Related
  • 1989-07-13 BR BR898903452A patent/BR8903452A/pt not_active IP Right Cessation
  • 1989-07-13 IE IE227789A patent/IE64114B1/en not_active IP Right Cessation
  • 1989-07-13 KR KR1019890009944A patent/KR0126470B1/ko not_active IP Right Cessation
  • 1989-07-13 JP JP1179199A patent/JPH0274681A/ja active Pending

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