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
  • C14C3/28—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
  • C14C3/00—Tanning; Compositions for 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
  • 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 present invention relates to new agents for simultaneous retanning and oiling of pre-tanned leather or furs, processes for making these agents and the Use of these agents for the production of leather or furs.
• the pre-tanned skins are usually neutralized, then retanned, greased and, if necessary, subsequently colored and even further equipped.
• the operations beginning with the neutralization are often in separate baths or carried out in succession in a bath, but can also in take a bath at the same time.
• the products used are usually individually in solid or liquid form used because it is difficult to mix homogeneous to manufacture.
• the fatliquors are almost exclusively liquid or at least wax-like and can be mixed with the solid components, e.g. the neutralizing agents and retanning agents, do not process into mixtures according to previously known methods, in which for a sufficiently long time and also at different temperatures a homogeneous distribution of the components and sufficient storage stability are guaranteed.
• New preparations have now been found which significantly simplify the process Allow wet dressing of leather, because with only one agent at the same time Retanning and greasing as well as possibly other treatments carried out can be. This is due to the fact that retanning agents and Fatting agents are present in such a form that they are added to the minimum 8 times the amount of water at 10 to 60 ° C give homogeneous mixtures.
• the agents according to the invention are used synergistic effect. You can namely the amount of retanning and Significantly reduce fatliquoring, compared to a method in which this Chemicals are used individually, although the usual retanning and greasing agents be used. In particular, the fat emulsification when using the Improved agents according to the invention and one arrives with smaller amounts Fatty substances.
• the agents according to the invention are excellent Storage stability and are frost-resistant, if it is solid agents.
• the transport and Storage effort compared to the use of special funds for each individual Treatment step can be significantly reduced and handling becomes significant simplified. They also save up to 60% water and time facilitate the reproducibility of the quality of the leather obtained. Furthermore, through the use of the agents according to the invention the penetration and distribution of the Chemicals in the leather are accelerated and / or improved. This leads e.g. to a better coloring of the leather. In addition, other important properties of the leather, such as the behavior towards water, fogging behavior, Adhesion strength of dressing films, stretch and strength properties as well as the Basis mass advantageously influenced.
• the agents according to the invention are preferably in such a form that they are usual stirring in water from 10 to 60 ° C are homogeneously distributable to form Suspensions or dispersions that are stable for the duration of the leather treatment.
• usual stirring in here is simple stirring using in To understand leather industry used stirrers.
• the agents according to the invention are preferably in such a form that they are the addition to water form micelles containing retanning agents and fatliquoring agents.
• the particles In the dispersions or suspensions, preferably 50% of the particles have one Size under 15 ⁇ m.
• Those agents according to the invention which are particularly preferred are: the addition to water form micelles in which 90% of the particles are smaller than 40 ⁇ m.
• the agents according to the invention are suitable for the treatment of for wet dressing prepared so-called semi-finished product, i.e. pre-tanned leather, e.g. Wetblue and Wetwhite.
• the retanning agents can be of natural or synthetic origin. In consideration for example, come the connections commonly used today, for example vegetable tannins, aromatic syntans, resin tannins, Reactive tanning agents, mineral and polymeric tanning agents.
• Suitable vegetable tannins are e.g. Tannins made from mimosa, quebracho, oak, Chestnut or spruce bark can be obtained. Vegetable are particularly suitable Tannins that contain pyrogallol or pyrocatechin (pyrocatechol).
• Aromatic syntane e.g. consider such connections through Condensation of sulfonated aromatic compounds alone or together with further, mostly unsulfonated aromatic compounds with formaldehyde and / or Urea are available.
• Aromatic compounds suitable for this are, for example: naphthalene, diphenyl, terphenyl, Phenols, cresols, 4,4'-dihydroxidiphenyl sulfone, ⁇ -naphthol, dihydroxy benzenes, resorcinol, 2,2'-bis (hydroxyphenyl) propane and diaryl ethers such as diphenyl ether and ditolyl ether, which optionally sulfonated in a manner known per se.
• condensation products are in the form of the free acids, preferably in the form of the Sulfonic acids, or as salts, especially ammonium, lithium, potassium or in particular Sodium salts.
• condensation products are known, for example from Ullmann's Encyclopedia of Industrial Chemistry Vol. 16, (4), 138 to 140 (1979) or can be prepared by the processes described in the references given there.
• Resin tanning agents e.g. the cationic condensation products containing nitrogen organic compounds, e.g. Urea, thiourea, dicyandiamide or melamine, with formaldehyde or other simple oxo compounds.
• nitrogen organic compounds e.g. Urea, thiourea, dicyandiamide or melamine
• Suitable resin tanning agents are the anionic compounds which are obtained when condensation products of nitrogen-containing organic compounds, e.g. Urea, thiourea, dicyandiamide or melamine, with formaldehyde or others simple oxo compounds and anionic compounds such as e.g. Phenols, Alkali salts of aromatic sulfonic acids, sulfonamides, lignin sulfonates, sulfite or Hydrogen sulfite condenses.
• nitrogen-containing organic compounds e.g. Urea, thiourea, dicyandiamide or melamine
• formaldehyde or others simple oxo compounds e.g. Phenols, Alkali salts of aromatic sulfonic acids, sulfonamides, lignin sulfonates, sulfite or Hydrogen sulfite condenses.
• Particularly preferred resin tanning agents are the condensation products of urea Formaldehyde and dicyandiamide-based resin tanning agents.
• Suitable reactive tanning agents are e.g. Mono-, di- and polyaldehydes, in particular Glutaraldehyde, multifunctional isocyanates, alkyl sulfochlorides, higher molecular weight Alkyl sulfonates as well as monomeric vinyl and acrylic derivatives and their polymers.
• chromium, aluminum, iron or come as mineral retanning agents Zirconium salts for example chromium (III) chloride or sulfate, chromium alum, optionally basic aluminum chloride or sulfate, iron (III) chloride or sulfate, Zirconium oxychloride and zirconium sulfate.
• the polymeric retanning agents are e.g. polyacrylates, copolymers, containing acrylates, polyurethanes or polybutadienes.
• Vegetable tanning agents are preferably used as tanning agents in the agents according to the invention, aromatic syntans or reactive tanning agents used.
• These fatliquoring agents are preferably by sulfation, sulfitation or formation of Modified sulfonic acids so that they are soluble or emulsifiable in water.
• These fatliquoring agents are preferably used as aqueous solutions or emulsions used.
• the agents according to the invention for producing leather can each have a single agent Contain neutralizers, a retanning agent and a fatliquor, but they can also contain mixtures of two and more of these components. This is even normally the case because these connections are rarely Pure substances, but technical mixtures of numerous, more or less similar connections.
• leather treatment agents contain further additives, e.g. Neutralizing agents, carriers, Dyes, impregnating agents, dressing agents and dressing aids.
• Suitable neutralizing agents for the inventive Agents are, for example, alkali salts of weak inorganic or organic Acids, aromatic sulfonic acids or aliphatic mono- or dicarboxylic acids. It is preferably sodium or potassium bicarbonate, formate or acetate, around oxalic acid, malonic acid, adipic acid or condensed sulfonated phenols. Sodium bicarbonate, sodium formate, acetic acid, adipic acid or are particularly suitable sulfonated diphenyl sulfones.
• Suitable carriers are e.g. Sodium chloride, Glauber's salt, sodium formate, Protein powder, starch, kaolin, polysaccharides, glucose or gelatin.
• Suitable dyes are the leather dyes usually used, for example natural dyes, also synthetic dyes, such as e.g. anionic Dyes, metal complex dyes, direct dyes, cationic dyes or Sulfur dyes. Pigments, i.e. largely in water to understand insoluble dyes.
• the impregnating agents are also those in the leather industry known means used, e.g. to means of protection against water, organic Solvents or oils or against dirt, means to improve the Resistance to abrasion, abrasion or other mechanical injuries, Means for improving the temperature resistance or light fastness and Flammability reduction or anti-static.
• Suitable dressing agents are e.g. Primers such as polyacrylates, butadiene copolymers or polyurethanes, or finishing agents, such as casein, nitrocellulose or Polyurethane preparations.
• preparation aid come the well known and used in practice in question, for example penetrators, primers and fillers, anti-adhesive agents, Thickening and stabilizing agents, plasticizers, matting agents, grip agents and Fixative.
• agents according to the invention are also possible in the form of solutions, dispersions or emulsions in a suitable solvent, preferably in water, to use.
• the percentages relate to the total weight of the funds Leather treatment.
• the agents according to the invention are produced in a manner known per se and Way, for example by adding a retanning agent, a fatliquor and if necessary, other additives are mixed undiluted.
• a retanning agent and fatliquor and any further ones that may be present Select additives so that the agents obtained when added to the at least 8 times the amount of water at 10 to 60 ° C give homogeneous mixtures.
• retanning agents are preferably used Additions as solutions or suspensions or dispersions, mixes them and then dries.
• water preferably serves as Solvents, but there are also organic solvents, for example one or polyhydric alcohols or hydrocarbons.
• Drying is done in the usual way, but should normally be done under conditions be carried out in which the homogeneous distribution of the constituents of the mixtures preserved. If all components are readily soluble in water or easily emulsifiable or are dispersible, the type of drying does not matter.
• It is preferably dried by spray drying. at about 80 to 140 ° C, especially at 100 to 120 ° C.
• a Carrier material for example sodium chloride, Glauber's salt, sodium formate, protein powder or starch to spray and dry at the same time or subsequently.
• the agents according to the invention are obtained in the form of powder or Granules in this form for the preparation of aqueous liquors for leather production can be used.
• the funds are not dusting, can be easily homogenized in Distribute water and remain free-flowing even after long storage, even with Temperatures up to approx. 40 ° C. If you don't have a carrier material or as such a non-salt one Used compound, the agents according to the invention can be salt-free or produce low in salt, which during further processing, e.g. with simultaneous or subsequent dyeing is often advantageous and relieves the environment.
• the agents according to the invention are suitable for producing various types of leather, for example for full-grain, slightly or heavily retanned leather or suede from Goat, sheep, beef or pork. With these means, leather is for everyone Usable uses, such as shoe, furniture, car, clothing and Bag leather.
• the agents according to the invention are also suitable for retanning and oiling of furs, whereby the hair is largely unaffected.
• the leather can be produced in all machines customary for wet finishing be carried out, for example barrel, Dosamat, tanning machine or mixer.
• the production takes place e.g. by pre-tanned leather, such as Wetblue or Wetwhite at 10 - 50 ° C in 50 - 300% water, based on the weight of the substrate, submitted, then added 5 - 30% of the agent according to the invention and this during 30 - Allow to act for 180 minutes at the stated temperature with circulation. Subsequently if necessary, 1 - 3% formic acid is added in two parts over 15 minutes and continue treatment for 40-60 minutes. Then let the fleet run off, rinses with 100 - 300% water for 5 - 10 minutes, drains the washing solution and completes in the usual way.
• pre-tanned leather such as Wetblue or Wetwhite at 10 - 50 ° C in 50 - 300% water, based on the weight of the substrate, submitted, then added 5 - 30% of the agent according to the invention and this during 30 - Allow to act for 180 minutes at the stated temperature with circulation. Subsequently if necessary, 1 - 3% formic acid is added in two
• This mixture is spray dried at normal pressure and 110 ° C. You get a powder which is suitable for wet dressing wetblue and wetwhite, especially for Manufacture of furniture and car upholstery leather and shoe leather.
• This mixture is spray dried at normal pressure and 110 ° C. You get a powder which is suitable for wet dressing wetblue and wetwhite, especially for Manufacture of furniture and car upholstery leather and shoe leather.
• This mixture is spray dried at normal pressure and 110 ° C. You get a powder which is suitable for wet dressing wetblue and wetwhite, especially for Manufacture of upper leather.
• the leather obtained is significantly softer than leather produced in a conventional manner, in its manufacture, the neutralization, retanning and greasing individually be carried out one after the other. It is also characterized by better tear resistance and lower fogging values at lower manufacturing costs.
• This mixture is spray dried at normal pressure and 110 ° C.
• This mixture is spray dried at normal pressure and 110 ° C. You get a powder which is suitable for the wet dressing of wetblue and wet white, especially for the Manufacture of upper leather.
• a piece of Wetblue (beef) 1.9 mm folded in a barrel in 30% water at 30 ° is added, and 15% of the agent according to Example 6 is added and treated at 30 ° for 30 minutes. Then 3% of the black powder dye C.I.Acid Black 210 is added and treated 90 minutes at 30 °.
• the leather obtained is significantly softer than leather produced in a conventional manner, in its manufacture, the neutralization, retanning and greasing individually be carried out one after the other.

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• 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)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Medicinal Preparation (AREA)

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• 1997
  • 1997-12-10 PL PL97323618A patent/PL323618A1/xx unknown
  • 1997-12-11 EP EP97810974A patent/EP0849365B1/fr not_active Expired - Lifetime
  • 1997-12-11 AT AT97810974T patent/ATE247719T1/de not_active IP Right Cessation
  • 1997-12-11 DE DE59710609T patent/DE59710609D1/de not_active Expired - Lifetime
  • 1997-12-18 BR BR9705614A patent/BR9705614A/pt unknown
  • 1997-12-18 AR ARP970106003A patent/AR010810A1/es not_active Application Discontinuation
  • 1997-12-19 TR TR97/01669A patent/TR199701669A1/xx unknown
  • 1997-12-19 AU AU48513/97A patent/AU733894B2/en not_active Ceased
  • 1997-12-19 JP JP9351218A patent/JPH10195500A/ja active Pending
  • 1997-12-19 KR KR1019970070393A patent/KR19980064329A/ko not_active Application Discontinuation
  • 1997-12-19 US US08/994,879 patent/US6033590A/en not_active Expired - Lifetime

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