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
  • 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 a composition for treating leather Process for their preparation and their use for hydrophobing and / or Softening leather.
• Water-soluble hydrophobic fatliquoring formulations contain the hydrophobierenden components emulsified or dispersed in a water phase. Many of the Emulsifiers used for this purpose have an effect due to their hydrophilic moieties Water repellency, which leads to insufficient water repellency of the leather.
• silicone oils without or with functional groups, such as OH, carboxy and Amino groups as well as halogen substituted polymers, e.g. Fluorocarbon compounds used. These have the disadvantage that they are often solvent-containing or even in Solvents must be applied. Also, the required waterproofness is sufficient Of the leather produced with it often not enough.
• fatty polyacrylates are used today. These cause a hydrophobing and at the same time softening effect. Their effect is enhanced by additional Use of silicone oils or functional silicone oils in the leather treatment agent (EP 1 087 021 A1). Disadvantage of these fatliquors is that the leather produced with it too much are soft, the typical "rubbery" handle acrylate-based fatliquor effect and thus for certain applications, e.g. for permanent shoe upper leather, not or only can be used proportionally.
• the present invention is therefore based on the object, an aqueous liquor to provide usable leather treatment agent for hydrophobing and / or Softening leather without the disadvantages of the prior art can be used can.
• the reaction product from the reaction of phosphating agent with the abovementioned OH components siloxane and furthermore alcohol and / or alcohol polyglycol ether is used, ie there is a phosphoric acid ester mixture in the composition according to the invention.
• a phosphating agent is understood to mean any agent that is capable of forming phosphoric acid esters with the OH components.
• the phosphating agent is P 2 O 5 , with which the phosphating reaction can be carried out in a particularly favorable, simple and rapid manner.
• the phosphoric acid esters are
• the ortho-phosphoric acid in particular derived from the ortho-phosphoric acid. It can be mono-, di- and triester act.
• the OH components used for the reaction with the phosphating agent are it is a mixture containing the above-described siloxanes and further either a C10-C40 alcohol or a C10-C40 alcohol polyglycol ether or both a C10-C40 alcohol as well as a C10-C40 alcohol polyglycol ether.
• the phosphoric acid ester mixture of the composition according to the invention can, as described above, by phosphating a mixture of the aforementioned OH components getting produced. But it is also possible in the inventive Composition each prepared separately with the respective OH components Use phosphoric acid ester.
• composition of the invention is the ⁇ , ⁇ -dihydroxypoly-C1-C4-alkylsiloxane the compound ⁇ , ⁇ -dihydroxypolydimethylsiloxane, with the in terms of their properties, in particular with regard to the hydrophobing and the Plasticizing, particularly advantageous composition of the invention is obtained.
• the viscosity of the siloxane is about 500 mPas. Siloxanes with this viscosity give, in particular with regard to the hydrophobic effect and the plasticizing Properties, particularly advantageous compositions according to the invention.
• Phosphoric acid ester mixtures can in the Phospatleitersrefractress several, from each other various C10-C40 alcohols are used.
• it may be primary Alcohols act.
• the alcohols are (i) unsaturated, especially simple unsaturated C12-C20 fatty alcohols, in particular cetyl alcohol and oleyl alcohol, or Mixtures of 2 or more of these, for example a mixture of cetyl alcohol and Oleyl alcohol in the ratio 1: 1, (ii) branched or unbranched saturated C20-C40 alcohols, for example, C30-C38 Guerbet alcohol, and (iii) saturated C10-C18 alcohols or mixtures from 2 or 3 of the alcohols (i) to (iii).
• the C10-C40 alcohol polyglycol ethers are preferably those derived from the C10-C40 alcohols described in more detail above, in particular the alcohols (i), (ii) and (iii) are derived.
• Alcohol polyglycol ethers have units derived from alkylene oxide of 0.5 to 10 moles. When Alkylene oxides can be used ethylene oxide, propylene oxide and mixtures thereof.
• the preparation of the phosphoric acid ester mixture used in the composition according to the invention can be carried out by initially charging the abovementioned OH components in a reaction vessel. If one of the OH components is solid, it may be necessary to melt it. Optionally, the mixture of the submitted OH components can be heated to about 40 ° C.
• the phosphating agent for example P 2 O 5 , is introduced into this mixture.
• the phosphating reaction is exothermic, the reaction temperature can rise to 80 ° C to 85 ° C. If it rises to over 85 ° C, it is favorable to carry out a cooling.
• the phosphating reaction can be carried out under a protective gas atmosphere, such as N 2 .
• the reaction temperature for the phosphating may be 70 ° C to 80 ° C.
• the reaction can be carried out with stirring. Conveniently, the reaction is stopped after completion of the phosphoric acid ester formation. This can be the case after about 5 to 6 hours.
• the phosphating agent P 2 O 5 is favorably used based on the OH groups of the OH components in a molar ratio of 1: 2 to 1: 3 (n P 2 O 5 : n OH groups). As a result, as complete as possible conversion of the phosphating agent is achieved.
• the amount of the siloxane is desirably 50% by weight to 60% by weight, based on the the phosphating reaction used mixture of OH components.
• the rest on 100% by weight, based on the mixture of the OH components used in the phosphating reaction, may then be the C10-C40 alcohol and / or C10-C40 alcohol polyglycol ether form.
• the above mixture of the OH components A, B, C and D may be 30 wt .-% to 40 wt .-% A, 5 wt .-% to 10 wt .-% B, 2 wt .-% to 4 wt .-% C and 50 wt .-% to 60 wt .-% D, wherein the amounts are based on the mixture of OH components are related.
• mineral oil preferably mineral oil is used.
• mineral oil the common mineral oils used for the leather grease can be used. These are mineral oils with predominantly paraffinic content (paraffinic mineral oils) with a viscosity of 15 mm 2 / s to 20 mm 2 / s at 40 ° C.
• mineral oils with predominantly paraffinic content (paraffinic mineral oils) with a viscosity of 15 mm 2 / s to 20 mm 2 / s at 40 ° C.
• other, for example naphthenic, mineral oils with other viscosities for example naphthenic, mineral oils with other viscosities.
• synthetic oils or waxes such as paraffin oil, alkylbenzenes, paraffin waxes, polyethylene waxes but also native oils or waxes, such as wool fat, beeswax, fish oil, rapeseed oil and lecithin can be used for the composition according to the invention.
• An emulsifier may furthermore be present in the composition according to the invention.
• the Emulsifier serves to stabilize the composition of the invention and to improve in terms of optical and performance properties. It In particular, such emulsifiers are used, the hydrophobizing the not affect the composition of the invention.
• emulsifiers examples include the salts of an ⁇ -amino acid having 2 to 6 described in EP 0 213 480 A2 Carbon atoms and with the acyl radical of a saturated or unsaturated fatty acid with 9 to 20 carbon atoms on the amine nitrogen, which may additionally be substituted by methyl may be, wherein as salts alkali metal salts, in particular of sodium or potassium, the Ammonium salts or salts of a mono-, di- or Trialkanolamins with 2 to 4 carbon atoms in Alkanolrest, in particular of mono-, di- or triethanolamine, come into consideration.
• N-oleoyl sarcoside, N-stearyl sarcoside, N-lauryl sarcoside has proven particularly useful and their salts.
• Nonionic surfactants can be used if they are Do not adversely affect the hydrophobic effect. These are e.g. nonionic emulsifiers (e.g., fatty alcohol ethoxylates) having an HLB preferably 3-9. Continue to use may be sorbitan esters and esters of other polyols. All can be used Surfactants from the group of anionic surfactants, if they meet the required performance Perform properties and do not lead to an impairment of the hydrophobic effect. These are e.g.
• the amount of emulsifier in the composition according to the invention is 0 to 5% by weight, preferably about 2.5% by weight.
• composition according to the invention can furthermore be customary setting agents, in particular Glycols, e.g. in an amount of 1 wt .-% to 2 wt .-%, based on the inventive Composition, as well as a biocide and / or fungicide, each e.g. in a lot of about 0.1 wt .-%, based on the composition of the invention.
• customary setting agents in particular Glycols, e.g. in an amount of 1 wt .-% to 2 wt .-%, based on the inventive Composition, as well as a biocide and / or fungicide, each e.g. in a lot of about 0.1 wt .-%, based on the composition of the invention.
• composition of the invention may be water, the also acts as a means of adjustment.
• water causes the inventive Composition can be used by the user immediately.
• distilled water or deionized water may be used, thereby advantageously avoided precipitation reactions in the composition of the invention become.
• composition of the invention especially in those described in more detail above preferred embodiments, has a whole series of advantages.
• the Composition according to the invention is an emulsifiable in water Leather treatment agent characterized by an excellent hydrophobicity and a also excellent softening effect of leather distinguishes. It is about a multifunctional composition with which the hydrophobing and softening of leather can be achieved at the same time.
• the adverse properties of the too plasticizing acrylate-based hydrophobicizing fatliquoring agent has the Composition of the invention not on. It becomes a reproducible good Hydrophobization exercised on the leather produced, with no additional, in the tannery used aids, gets by.
• the composition of the invention does not adversely affect the subsequent leather treatment steps.
• the wearing hygienic Properties of the leather produced with the composition according to the invention outstanding.
• the composition according to the invention can be used without further use organic solvents are used, whereby they are toxicological and environmentally relevant aspects proves beneficial.
• the composition of the invention can be easily applied to the leather in aqueous liquor.
• the present invention further provides a process for the preparation of Composition according to the invention, wherein the phosphoric acid ester mixture a), the Mineral oil b) and, if appropriate, the further constituents, such as emulsifier, adjuster, biocide and fungicide, be mixed and water is then added to this mixture.
• the addition of water can be done with stirring.
• the pH of the invention Composition can with a base, preferably sodium or potassium hydroxide solution to a value be set between 7 and 9.
• the addition of adjusting agents, such as glycols, z. B. butyglycol, Fungicide and biocide can also be done only after the addition of water.
• the invention is suitable Composition ideal for softening and waterproofing leather. Due to the Multifunctionality of the composition of the invention can softening and Hydrophobing be achieved simultaneously.
• the composition according to the invention can be used in in principle the same way as the previously used fatliquoring agents and water repellents be used.
• the amount of the composition according to the invention can be 8% by weight. to 15 wt .-%, based on the shaved weight of the leather.
• Example 1 Preparation of a Composition According to the Invention
• Example 2 Treatment of pure chrome leather using the agent according to the invention
• Example 3 Treatment of vegetable retanned leather using a composition according to the invention
• the leathers produced according to Examples 2 and 3 were full, soft, had a pleasant Handle and had no negative rubbery handle. Furthermore, they show one excellent water repellency.

Landscapes

• Chemical & Material Sciences (AREA)
• Oil, Petroleum & Natural Gas (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Treatment And Processing Of Natural Fur Or Leather (AREA)

Priority Applications (3)

Applications Claiming Priority (1)

Publications (2)

Family

ID=34130069

Family Applications (1)

Country Status (3)

Cited By (1)

Citations (3)

• 2003
  • 2003-08-04 EP EP03017794A patent/EP1512759B1/fr not_active Expired - Lifetime
  • 2003-08-04 AT AT03017794T patent/ATE388246T1/de active
  • 2003-08-04 DE DE50309326T patent/DE50309326D1/de not_active Expired - Lifetime

Patent Citations (3)

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events