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EP1678332A1 - Method for coating leather with dispersed synthetic resin - Google Patents

Method for coating leather with dispersed synthetic resin

Info

Publication number
EP1678332A1
EP1678332A1 EP04790527A EP04790527A EP1678332A1 EP 1678332 A1 EP1678332 A1 EP 1678332A1 EP 04790527 A EP04790527 A EP 04790527A EP 04790527 A EP04790527 A EP 04790527A EP 1678332 A1 EP1678332 A1 EP 1678332A1
Authority
EP
European Patent Office
Prior art keywords
leather
grain
plastic
grain layer
compact particles
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.)
Granted
Application number
EP04790527A
Other languages
German (de)
French (fr)
Other versions
EP1678332B1 (en
Inventor
Philipp Schäfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP1678332A1 publication Critical patent/EP1678332A1/en
Application granted granted Critical
Publication of EP1678332B1 publication Critical patent/EP1678332B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • C14C11/00—Surface finishing of leather
    • 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
    • C14C11/00—Surface finishing of leather
    • C14C11/003—Surface finishing of leather using macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C14—SKINS; HIDES; PELTS; LEATHER
    • C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
    • C14B7/00—Special leathers and their manufacture

Definitions

  • the invention relates to a method for eliminating imperfections in the grain layer of a full-grain leather, in particular cowhide leather, a plastic compound eliminating these being applied to the imperfections.
  • the invention further relates to a full-grain leather, in particular cowhide, in which the imperfections in the grain layer are eliminated.
  • the grain layer of full-grain leather in particular cowhide leather, often has defects, caused, for example, by hedge cracks, barbed wire injuries, insect bites or the like, which are only present in individual places, at most on an area of 10%, of the leather skin, but nevertheless this leather skin make it less valuable.
  • Such leathers are therefore converted into so-called corrected grain leathers by filling in the flaws and then sanding down the grain layer, but these have a lower value and can only be marketed at a substantial discount.
  • This foamed plastic layer must have a thickness such that it fills the negative whale nappa structure on the surface of the roller or plate, so that for this reason a leather treated in this way can no longer be called genuine leather, since the whale nappa effect is achieved by embossing.
  • the object of the present invention is to create a method by means of which defects in the grain layer of a full-grain leather, in particular cowhide leather, can be eliminated, so that the existing damage to the grain layer is no longer noticeable, but without the disadvantages of known methods occur, after which very thin finishes can also be applied, so that such leather can be referred to as genuine leather.
  • the method according to the invention is intended to fill in the imperfections in the grain layer, which are generally formed by depressions, in such a way that the filling compound does not fall out even when the leather is subjected to permanent bending stress, and furthermore that the filling compound does not fall after it has solidified shrinks that it is waterproof and that it mainly only cleans up the imperfections and does not cover the entire surface of the scar layer or only with a very small thickness.
  • the invention proposes that an aqueous, optionally slightly foamed, plastic dispersion, which contains the smallest compact particles, is pressed into the defects and then the leather is dried, whereupon the grain layer is subjected to a pressure and heat treatment, which results in the compact particles are formed in the solidified plastic dispersion at least partially hollow microspheres.
  • the process according to the invention does not use a pasty filler, but rather an aqueous plastic dispersion to fill in the flaws, the adhesion to the flaws is significantly improved, the compact particles expanding to form the hollow microspheres as a result of the pressure and heat treatment, and thereby Overpressure arises, so that the plastic mass that arises after drying at the flaws firmly connects to the surface of the flaws and in particular to the borders of the depressions forming the flaws and withstands any bending stress.
  • the hollow microspheres in the len provided surface of the grain layer, formed from the solidified plastic dispersion plastic mass are at least largely destroyed by the pressure and heat treatment or can not form at all, so that a maximum of a plastic layer, the thickness of which is usually not measurable, arises at these points in any case is thinner than 60 ⁇ m.
  • the plastic dispersion is pressed into the imperfections by means of an application roller, preferably in opposite directions, optionally having a finely structured surface, so that the plastic dispersion is applied with a doctor blade in a thickness that is very low outside of the imperfections.
  • the pressure and heat treatment is effected according to the invention by a pressure roller which contacts the scar layer and is heated to a temperature of at least 100 ° C., preferably between 120 ° C. and 180 ° C., by means of which the at least partially solidified plastic dispersion is pressed firmly into the defects and the compact particles expand to form the hollow microspheres in the solidified plastic dispersion.
  • the surface of the pressure roller can be smooth.
  • the pressure roller preferably has a finely structured surface, such as can be achieved, for example, by sandblasting, as a result of which the surface of the plastic mass filling the defects also has such a structure.
  • compact particles with a size of less than 10 ⁇ m, preferably less than 7 ⁇ m, are used in an amount between 15 g and 60 g, based on 1 kg of a 40% plastic dispersion, and made of a thermoplastic Are made of plastic and contain a liquid blowing agent.
  • a complete filling of the wells forming the defects is ensured with the plastic mass formed from the plastic dispersion and an intimate connection thereof with the surface of the wells is ensured.
  • Compact particles are expediently used which expand at a temperature below 120 ° C., preferably below 80 ° C. At such temperatures, no pronounced spatial structure is formed on the undamaged surface of the grain layer by a plastic dispersion that may have been applied there after it has solidified.
  • disruptive hollow microspheres can be eliminated or their formation can be prevented at all by a mixture of water and solvent, for example 90 parts water, according to the invention on the solidified plastic dispersion and 10 parts of solvent, in particular ethyl acetate, preferably sprayed on, followed by pressure and heat treatment.
  • the hollow microspheres which are then in a moist state, then collapse in the presence of a small amount of solvent even at temperatures below 65 ° C. and at a pressure of less than 0.5 kg / cm or they are not formed at all.
  • pigmented compact particles are expediently used, the color of which corresponds to that of the grain layer and / or the plastic dispersion.
  • a full-grain leather, in particular cowhide, which has partial flaws on its grain layer, which are corrected by a plastic filling compound, is characterized in accordance with the invention in that the plastic filling compound consists of a solidified, aqueous plastic dispersion containing hollow microspheres formed by the supply of heat, which consists of Applying is pressed into the imperfections.
  • the formation of the hollow microspheres is preferably stronger in the area adjacent to the surface of the scar layer than in the area farther away from this surface, which has the advantage that, after pressure relief, the solidified plastic dispersion containing hollow microspheres does not expand over the surface of the scar layer.
  • This plastic dispersion contains compact particles made of a thermoplastic copolymer, from which hollow microspheres are formed by the application of heat
  • the aqueous plastic dispersion is applied to the surface 4 of the grain layer 2 by means of an application roller which is finely structured on its surface, with means which the aqueous plastic dispersion is brushed into the recesses like with a squeegee. Subsequently, the leather with the applied plastic dispersion is dried and it is 4 the grain layer 2 subjected to the surface by means of a heated to a temperature between 120 ° C and 180 C C pressure roller of a pressure and heat treatment. The compact particles expand, so that a small plastic hollow mass 5 containing hollow microspheres 5 is formed in the recesses, which is pressed firmly into the recesses by the pressure exerted and connects intimately to the edges of the recesses.
  • the hollow microspheres mainly form only in the area 4 adjacent to the surface 4 of the depressions forming the defects 3 , whereas there is less training in the lower areas or the compact particles do not expand at all.
  • a suitable pressure but above all by choosing a suitable temperature of the pressure roller and the dwell time thereof on the surface 4
  • hollow microspheres are formed only to a depth of 0.12 mm. Nevertheless, the depressions are completely filled by the solidified plastic dispersion.
  • the dwell time is halved, and the formation of the hollow microspheres as a result of the heat is then prevented in those areas where there are no defects 3.
  • the formation of the hollow microspheres is prevented at all by the applied pressure, or already formed hollow microspheres are pressed together in such a way that, if at all, only a non-disturbing plastic coating of barely measurable thickness is created which does not affect the grain of the leather.
  • Hollow microspheres for example, in a plastic coating in these areas can also be eliminated by spraying a mixture of about 90 parts of water and 10 parts of solvent, for example ethylene acetate, and then subjecting these areas to pressure and heat treatment. In this moist state, the hollow microspheres then collapse even at temperatures below 65 ° C. at a pressure of less than 0.5 kg / cm 2 , so that in this process the hollow microspheres collapse or are not formed at all.
  • solvent for example ethylene acetate

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The invention relates to a method for correcting flaws produced in the grain layer (2) of grain leather (1) by indentations by pressing, by means of an application roller such as a squeegee, into said indentations an aqueous, optionally slightly foamed dispersed synthetic resin which contains miniscule compact particles and then drying the leather (1). The surface (4) of the grain layer (2) is then subjected to pressure and heat at a temperature of at least 100 °C by means of a pressure roll rolling off on said surface, thereby producing in the indentations a synthetic mass in which microspheres (5) formed from the compact particles are present and which completely fills in the indentations.

Description

BESCHICHTUNG VON LEDER MITTELS EINER KUNSTSTOFFDISPERSIONCOATING LEATHER BY PLASTIC DISPERSION
Beschreibungdescription
Die Erfindung betrifft ein Verfahren zur Beseitigung von Fehlstellen in der Narbenschicht eines vollnarbigen Leders, insbesondere Rindleders, wobei an den Fehlstellen eine diese beseitigende Kunststoffmasse aufgebracht wird. Ferner betrifft die Erfindung ein vollnarbiges Leder, insbesondere Rindleder, bei welchem die Fehlstellen in der Narbenschicht beseitigt sind.The invention relates to a method for eliminating imperfections in the grain layer of a full-grain leather, in particular cowhide leather, a plastic compound eliminating these being applied to the imperfections. The invention further relates to a full-grain leather, in particular cowhide, in which the imperfections in the grain layer are eliminated.
Die Narbenschicht von vollnarbigen Ledern, insbesondere Rindsledern, weist häufig, verursacht beispielsweise durch Heckenrisse, Stacheldrahtverletzungen, Insektenstiche oder dgl., Fehlstellen auf, welche nur an einzelnen Stellen, maximal auf einer Fläche von 10 %, der Lederhaut vorhanden sind, dennoch aber diese Lederhaut gering- wertiger machen. Derartige Leder werden deshalb durch Ausspachteln der Fehlstellen und anschließendes Abschleifen der Narbenschicht zu sogenannten korrigierten Narbenledern umfunktioniert, die aber einen geringeren Wert besitzen und nur mit einem erheblichen Abschlag vermarktet werden können.The grain layer of full-grain leather, in particular cowhide leather, often has defects, caused, for example, by hedge cracks, barbed wire injuries, insect bites or the like, which are only present in individual places, at most on an area of 10%, of the leather skin, but nevertheless this leather skin make it less valuable. Such leathers are therefore converted into so-called corrected grain leathers by filling in the flaws and then sanding down the grain layer, but these have a lower value and can only be marketed at a substantial discount.
Es ist bereits bekannt, Fehler, die nicht durch die Narbenschicht hindurchgehen, mit einer Kunststoffspachtelmasse auszufüllen, diese trocknen zu lassen und anschließend die Narbenschicht abzuschleifen, wobei die gesamte oberste Narbenschicht entfernt wird. Es wurde auch bereits vorgeschlagen, zur Beseitigung von Fehlstellen in der Narbenschicht hochviskose, wässerige Kunststoffspachtelmassen, die geschäumt sind oder Mikrohohlkugeln enthalten, vollflächig auf die Oberfläche der Narbenschicht aufzutragen, diese Spachtelmassen trocknen zu lassen und anschließend abzuschleifen, wobei auch hier die oberste Narbenschicht abgetragen wird. Beide Methoden haben den Nachteil, dass die wässrigen Kunststoffspachtelmassen maximal 80 % Feststoff- anteil enthalten und daher diese Massen beim Entziehen des Wassers schrumpfen, also in den Fehlstellen einfallen und sich vom Rand derselben lösen, wobei die Gefahr besteht, dass sie bei einer Biegebeanspruchung des Leders aus den Fehlstellen herausfallen.It is already known to fill in defects which do not pass through the grain layer with a plastic filler, to let it dry and then to grind off the grain layer, the entire uppermost grain layer being removed. It has also already been proposed to apply highly viscous, aqueous plastic fillers, which are foamed or contain hollow microspheres, to the entire surface of the scar layer in order to eliminate defects in the scar layer, to allow these fillers to dry and then to be sanded off, the uppermost scar layer also being removed here , Both methods have the disadvantage that the aqueous plastic fillers contain a maximum of 80% solids and therefore these masses shrink when the water is removed, i.e. they fall into the defects and detach themselves from the edge of the same, with the risk that they will bend when the Leather falling out of the flaws.
Es ist weiters bekannt, einen sogenannten Schlagschaum mit hoher Viskosität, mittels Walzen vollflächig auf die Oberfläche der Narbenschicht aufzutragen und dabei in die schadhaften Vertiefungen zu drücken. Derartige Schlagschäume enthalten zwangsläufig ein Schäummittel sowie Schaumstabilisatoren, durch welche die Wasserbeständigkeit der verfestigten Schäume reduziert wird. Eine verfestigte Schlagschaumschicht führt ferner bei vollnarbigem Ledern zu einer niedrigeren Haftung einer auf eine solche Schicht in der Folge aufgebrachten Kunststoffzurichtung, weil sich der Schlagschaum oft spaltet oder vom Leder ablöst. Man hat auch bereits vorgeschlagen, vollnarbiges oder an der Narbenseite leicht angeschliffenes Leder mit einer Kunststoffschicht zu versehen, welche aus einer wässerigen, Kompaktteilchen enthaltenden Kunststoffdispersion gebildet ist, welche nach ihrer Verfestigung mit einer heißen Prägewalze oder Prägeplatte beaufschlagt wird. Dabei expandieren die Kompaktteilchen und die Kunststoffschicht schäumt in die negative Walknappastruktur an der Oberfläche der heißen Prägewalze oder Prägeplatte ein. Anschließend wird das Leder gemillt und mit einer Zurichtung versehen. Diese geschäumte Kunststoff schicht muss eine solche Dicke aufweisen, dass sie die negative Walknappastruktur an der Oberfläche der Walze oder Platte ausfüllt, sodass ein derart behandeltes Leder aus diesem Grunde nicht mehr als echtes Leder bezeichnet werden kann, da der Walknappaeffekt durch Prägen erzielt wird.It is also known to apply a so-called whipped foam with high viscosity to the entire surface of the scar layer by means of rollers and to press it into the damaged depressions. Blow foams of this type inevitably contain a foaming agent and foam stabilizers, by means of which the water resistance of the solidified foams is reduced. In the case of full-grain leather, a consolidated layer of whipped foam also leads to a lower adhesion of a plastic finish subsequently applied to such a layer, because the whipped foam often splits or separates from the leather. It has also been proposed to provide full-grain leather or leather slightly sanded on the grain side with a plastic layer, which is formed from an aqueous, compact particle-containing plastic dispersion, which is applied with a hot embossing roller or embossing plate after it has solidified. The compact particles expand and the plastic layer foams into the negative whale nappa structure on the surface of the hot embossing roller or embossing plate. The leather is then milled and finished. This foamed plastic layer must have a thickness such that it fills the negative whale nappa structure on the surface of the roller or plate, so that for this reason a leather treated in this way can no longer be called genuine leather, since the whale nappa effect is achieved by embossing.
Die vorliegende Erfindung hat sich zur Aufgabe gestellt, ein Verfahren zur schaffen, mittels welchem Fehlstellen in der Narbenschicht eines vollnarbigen Leders, insbeson- dere Rindleders, beseitigt werden können, sodass die vorhandenen Beschädigungen der Narbenschicht nicht mehr merkbar sind, ohne dass jedoch die Nachteile der bekannten Verfahren auftreten, wobei im Anschluss daran auch sehr dünne Zurichtungen aufgebracht werden können, so dass ein solches Leder als echtes Leder bezeichnet werden kann.The object of the present invention is to create a method by means of which defects in the grain layer of a full-grain leather, in particular cowhide leather, can be eliminated, so that the existing damage to the grain layer is no longer noticeable, but without the disadvantages of known methods occur, after which very thin finishes can also be applied, so that such leather can be referred to as genuine leather.
Insbesondere soll mit dem erfindungsgemäßen Verfahren bewirkt werden, die Fehlstellen in der Narbenschicht, welche in der Regel von Vertiefungen gebildet sind, so auszufüllen, dass die Füllmasse auch bei einer bei Verwendung des Leders auftretenden Dauerbiegebeanspruchung nicht herausfällt, dass ferner die Füllmasse nicht nach ihrer Verfestigung schrumpft, dass sie wasserfest ist und dass sie in der Hauptsache lediglich die Fehlstellen saniert und nicht oder nur mit einer sehr geringen Stärke die gesamte Oberfläche der Narbenschicht bedeckt.In particular, the method according to the invention is intended to fill in the imperfections in the grain layer, which are generally formed by depressions, in such a way that the filling compound does not fall out even when the leather is subjected to permanent bending stress, and furthermore that the filling compound does not fall after it has solidified shrinks that it is waterproof and that it mainly only cleans up the imperfections and does not cover the entire surface of the scar layer or only with a very small thickness.
Zur Lösung dieser Aufgabe schlägt die Erfindung vor, dass eine wässerige, gegebe- nenfalls leicht geschäumte, Kunststoffdispersion, welche kleinste Kompaktteilchen enthält, in die Fehlstellen gedrückt und anschließend das Leder getrocknet wird, worauf die Narbenschicht einer Druck- und Wärmebehandlung unterzogen wird, wodurch aus den Kompaktteilchen in der verfestigten Kunststoffdispersion zumindest teilweise Mikrohohlkugeln gebildet werden. Dadurch, dass beim erfindungsgemäßen Verfahren kei- ne pastöse Spachtelmasse, sondern vielmehr eine wässerige Kunststoffdispersion zum Ausfüllen der Fehlstellen verwendet wird, wird die Haftung an den Fehlstellen wesentlich verbessert, wobei durch die Druck- und Wärmebehandlung die Kompaktteilchen zur Bildung der Mikrohohlkugeln expandieren und dadurch ein Überdruck entsteht, so dass durch diesen an den Fehlstellen die nach der Trocknung entstehende Kunst- stoffmasse sich fest mit der Oberfläche der Fehlstellen und insbesondere mit den Umrandungen der die Fehlstellen bildenden Vertiefungen verbindet und jeder Biegebeanspruchung standhält. Die Mikrohohlkugeln in gegebenenfalls an der nicht mit Fehlstel- len versehenen Oberfläche der Narbenschicht vorhandenen, aus der verfestigten Kunststoffdispersion gebildeten Kunststoffmasse werden durch die Druck- und Wärmebehandlung zumindest zum Großteil zerstört bzw. können sich gar nicht ausbilden, sodass an diesen Stellen maximal eine Kunststoffschicht entsteht, deren Dicke in der Regel nicht messbar, auf jeden Fall aber dünner als 60 μm ist.To achieve this object, the invention proposes that an aqueous, optionally slightly foamed, plastic dispersion, which contains the smallest compact particles, is pressed into the defects and then the leather is dried, whereupon the grain layer is subjected to a pressure and heat treatment, which results in the compact particles are formed in the solidified plastic dispersion at least partially hollow microspheres. Because the process according to the invention does not use a pasty filler, but rather an aqueous plastic dispersion to fill in the flaws, the adhesion to the flaws is significantly improved, the compact particles expanding to form the hollow microspheres as a result of the pressure and heat treatment, and thereby Overpressure arises, so that the plastic mass that arises after drying at the flaws firmly connects to the surface of the flaws and in particular to the borders of the depressions forming the flaws and withstands any bending stress. The hollow microspheres in the len provided surface of the grain layer, formed from the solidified plastic dispersion plastic mass are at least largely destroyed by the pressure and heat treatment or can not form at all, so that a maximum of a plastic layer, the thickness of which is usually not measurable, arises at these points in any case is thinner than 60 μm.
Gemäß einer bevorzugten Ausführungsform der Erfindung wird die Kunststoffdispersion mittels einer, vorzugsweise gegenläufigen, gegebenenfalls eine feinstrukturierte Oberfläche aufweisenden Auftragswalze in die Fehlstellen gedrückt, so dass ein rakel- artiger Auftrag der Kunststoffdispersion in einer außerhalb der Fehlstellen sehr geringen Stärke erfolgt.According to a preferred embodiment of the invention, the plastic dispersion is pressed into the imperfections by means of an application roller, preferably in opposite directions, optionally having a finely structured surface, so that the plastic dispersion is applied with a doctor blade in a thickness that is very low outside of the imperfections.
Die Druck- und Wärmebehandlung wird erfindungsgemäß durch eine auf eine Temperatur von mindestens 100°C, vorzugsweise zwischen 120°C und 180°C , aufgeheizte, die Narbenschicht kontaktierende Druckwalze bewirkt, durch welche die zumindest teilweise verfestigte Kunststoffdispersion fest in die Fehlstellen gedrückt wird und dabei die Kompaktteilchen zur Bildung der Mikrohohlkugeln in der verfestigten Kunststoffdispersion expandieren.The pressure and heat treatment is effected according to the invention by a pressure roller which contacts the scar layer and is heated to a temperature of at least 100 ° C., preferably between 120 ° C. and 180 ° C., by means of which the at least partially solidified plastic dispersion is pressed firmly into the defects and the compact particles expand to form the hollow microspheres in the solidified plastic dispersion.
Die Oberfläche der Druckwalze kann glatt ausgebildet sein. Vorzugsweise weist die Druckwalze aber eine feinstrukturierte Oberfläche auf, wie sie beispielsweise durch Sandstrahlung erzielt werden kann, wodurch auch die Oberfläche der die Fehlstellen ausfüllenden Kunststoffmasse eine derartige Struktur erhält.The surface of the pressure roller can be smooth. However, the pressure roller preferably has a finely structured surface, such as can be achieved, for example, by sandblasting, as a result of which the surface of the plastic mass filling the defects also has such a structure.
Besonders vorteilhaft ist es, wenn Kompaktteilchen mit einer Größe von weniger als 10 μm, vorzugsweise von weniger als 7 μm, in einer Menge zwischen 15 g und 60 g, bezogen auf 1 kg einer 40%igen Kunststoffdispersion, verwendet werden, und aus einem thermoplastischen Kunststoff bestehen, sowie ein flüssiges Treibmittel enthalten. In diesem Fall ist ein vollständiges Ausfüllen der die Fehlstellen bildenden Vertiefungen mit der aus der Kunststoffdispersion gebildeten Kunststoff masse und eine innige Verbindung derselben mit der Oberfläche der Vertiefungen sichergestellt.It is particularly advantageous if compact particles with a size of less than 10 μm, preferably less than 7 μm, are used in an amount between 15 g and 60 g, based on 1 kg of a 40% plastic dispersion, and made of a thermoplastic Are made of plastic and contain a liquid blowing agent. In this case, a complete filling of the wells forming the defects is ensured with the plastic mass formed from the plastic dispersion and an intimate connection thereof with the surface of the wells is ensured.
Zweckmäßig werden Kompaktteilchen verwendet, die bei einer Temperatur unter 120°C, vorzugsweise unter 80°C expandieren. Bei derartigen Temperaturen entsteht auf der nicht beschädigten Oberfläche der Narbenschicht durch eine dort allenfalls aufgebrachte Kunststoffdispersion nach deren Verfestigung keine ausgeprägte Raumstruktur.Compact particles are expediently used which expand at a temperature below 120 ° C., preferably below 80 ° C. At such temperatures, no pronounced spatial structure is formed on the undamaged surface of the grain layer by a plastic dispersion that may have been applied there after it has solidified.
In einer in Bereichen neben den Fehlstellen befindlichen verfestigten Kunststoffdisper- sion können störende Mikrohohlkugeln dadurch beseitigt oder deren Entstehen überhaupt verhindert werden, dass erfindungsgemäß auf die verfestigte Kunststoffdispersion ein Gemisch aus Wasser und Lösungsmittel, beispielsweise von 90 Teilen Wasser und 10 Teilen Lösungsmittel, insbesondere Äthylacetat aufgebracht, vorzugsweise aufgesprüht, wird und anschließend eine Druck- und Wärmebehandlung erfolgt .Die dann in einem feuchten Zustand befindlichen Mikrohohlkugeln kollabieren dann bei Anwesenheit einer geringen Menge von Lösungsmittel bereits bei Temperaturen unter 65 °C und bei einem Druck von weniger als 0,5 kg/cm oder sie werden gar nicht gebildet.In a solidified plastic dispersion located in areas adjacent to the defects, disruptive hollow microspheres can be eliminated or their formation can be prevented at all by a mixture of water and solvent, for example 90 parts water, according to the invention on the solidified plastic dispersion and 10 parts of solvent, in particular ethyl acetate, preferably sprayed on, followed by pressure and heat treatment. The hollow microspheres, which are then in a moist state, then collapse in the presence of a small amount of solvent even at temperatures below 65 ° C. and at a pressure of less than 0.5 kg / cm or they are not formed at all.
Um die Optik der die Fehlstellen ausfüllenden Kunststoff masse an jene der Narbenschicht anzupassen, werden zweckmäßig pigmentierte Kompaktteilchen verwendet, deren Farbe jener der Narbenschicht und/oder der Kunststoffdispersion entspricht.In order to adapt the appearance of the plastic mass filling the imperfections to that of the grain layer, pigmented compact particles are expediently used, the color of which corresponds to that of the grain layer and / or the plastic dispersion.
Ein vollnarbiges Leder, insbesondere Rindleder, welches an seiner Narbenschicht partiell Fehlstellen aufweist, die durch eine Kunststofffüllmasse korrigiert sind, ist erfindungsgemäß dadurch gekennzeichnet, dass die Kunststofffüllmasse aus einer verfes- tigten, wässerigen, aus Kompaktteilchen durch Wärmezufuhr gebildeten Mikrohohlkugeln enthaltenden Kunststoffdispersion besteht, die beim Auftragen in die Fehlstellen gedrückt wird.A full-grain leather, in particular cowhide, which has partial flaws on its grain layer, which are corrected by a plastic filling compound, is characterized in accordance with the invention in that the plastic filling compound consists of a solidified, aqueous plastic dispersion containing hollow microspheres formed by the supply of heat, which consists of Applying is pressed into the imperfections.
Vorzugsweise ist die Ausbildung der Mikrohohlkugeln in dem der Oberfläche der Nar- benschicht benachbarten Bereich stärker als in dem dieser Oberfläche entfernteren Bereich, was den Vorteil mit sich bringt, dass sich nach Druckentlastung die Mikrohohlkugeln enthaltende verfestigte Kunststoffdispersion nicht über die Oberfläche der Narbenschicht ausdehnt.The formation of the hollow microspheres is preferably stronger in the area adjacent to the surface of the scar layer than in the area farther away from this surface, which has the advantage that, after pressure relief, the solidified plastic dispersion containing hollow microspheres does not expand over the surface of the scar layer.
Die einzige Zeichnung zeigt in stark vergrößertem Maßstab ein vollnarbiges Leder, dessen in der Narbenschicht vorhandenen Fehlstellen nach dem erfindungsgemäßen Verfahren korrigiert wurden.The only drawing shows, on a greatly enlarged scale, a full-grain leather, the defects of which are present in the grain layer have been corrected by the method according to the invention.
Ein Leder 1 , von welchem in der Zeichnung nur der oberste Bereich gezeigt ist, weist eine Narbenschicht 2 auf, die durch Verletzungen der Narbenschicht entstandene Fehlstellen 3 besitzt, die von Vertiefungen in der Narbenschicht 2 gebildet sind. Diese Vertiefungen können die gesamte Dicke der Narbenschicht durchsetzen, aber auch nur oberflächlich an der Narbenschicht 2 vorhanden sein. Um die von diesen Vertiefungen gebildeten Fehlstellen 3 zu beseitigen, werden diese Vertiefungen durch eine wässeri- ge Dispersion aus beliebigen Kunststoffen oder Kunststoffmischungen ausgefüllt, die im flüssigen Zustand gut, nach ihrer Verfestigung jedoch kaum mehr klebt, und dann eine Bruchdehnung von mehr als 300 % aufweist. Diese Kunststoffdispersion enthält Kompaktteilchen aus einem thermoplastischen Copolymerisat, aus welchen durch Wärmezufuhr Mikrohohlkugeln gebildet werdenA leather 1, of which only the uppermost region is shown in the drawing, has a grain layer 2 which has defects 3 which are formed by injuries to the grain layer and which are formed by depressions in the grain layer 2. These depressions can penetrate the entire thickness of the grain layer, but can also only be present on the surface of the grain layer 2. In order to eliminate the imperfections 3 formed by these depressions, these depressions are filled with an aqueous dispersion of any plastics or plastic mixtures, which in the liquid state adheres well but hardly sticks after solidification, and then has an elongation at break of more than 300%. having. This plastic dispersion contains compact particles made of a thermoplastic copolymer, from which hollow microspheres are formed by the application of heat
Das Aufbringen der wässerigen Kunststoffdispersion auf die Oberfläche 4 der Narbenschicht 2 erfolgt mittels einer an ihrer Oberfläche fein strukturierten Auftragswalze, mit- tels welcher die wässerige Kunststoffdispersion wie mit einer Rakel in die Vertiefungen gestrichen wird. Anschließend wird das Leder mit der aufgebrachten Kunststoffdispersion getrocknet und es wird die Oberfläche 4 der Narbenschicht 2 mittels einer auf eine Temperatur zwischen 120°C und 180CC erwärmten Druckwalze einer Druck- und Wärmebehandlung unterzogen. Dabei expandieren die Kompaktteilchen, sodass in den Vertiefungen eine kleine Mikrohohlkugeln 5 enthaltende Kunststoffmasse entsteht, welche durch den ausgeübten Druck fest in die Vertiefungen gepresst wird und sich innig mit der Berandung der Vertiefungen verbindet. Durch Wahl eines geeigneten Druckes, vor allem aber durch Wahl einer geeigneten Temperatur der Druckwalze und der Verweilzeit derselben auf der Oberfläche 4, wird erreicht, dass sich die Mikrohohlkugeln in der Hauptsache nur in dem der Oberfläche 4 benachbarten Bereich der die Fehlstellen 3 bildenden Vertiefungen bilden, wogegen in den unteren Bereichen eine geringere Ausbildung erfolgt oder die Kompaktteilchen überhaupt nicht expandieren. So entstehen beispielsweise bei einer Verweilzeit der Druckwalze von etwa 1 Sekunde und einer Walzentemperatur von etwa 145 °C Mikrohohlkugeln nur bis zu einer Tiefe von 0,12 mm. Trotzdem werden aber die Vertiefungen vollständig von der verfestigten Kunststoffdispersion ausgefüllt. Bei einer Temperatur der Druckwalze von mehr als 170 °C halbiert sich die Verweilzeit, und es wird dann in jenen Bereichen, wo keine Fehlstellen 3 vorhanden sind, die Bildung der Mikrohohlkugeln in Folge der Hitze verhin- dert.The aqueous plastic dispersion is applied to the surface 4 of the grain layer 2 by means of an application roller which is finely structured on its surface, with means which the aqueous plastic dispersion is brushed into the recesses like with a squeegee. Subsequently, the leather with the applied plastic dispersion is dried and it is 4 the grain layer 2 subjected to the surface by means of a heated to a temperature between 120 ° C and 180 C C pressure roller of a pressure and heat treatment. The compact particles expand, so that a small plastic hollow mass 5 containing hollow microspheres 5 is formed in the recesses, which is pressed firmly into the recesses by the pressure exerted and connects intimately to the edges of the recesses. By choosing a suitable pressure, but above all by choosing a suitable temperature of the pressure roller and the dwell time thereof on the surface 4, it is achieved that the hollow microspheres mainly form only in the area 4 adjacent to the surface 4 of the depressions forming the defects 3 , whereas there is less training in the lower areas or the compact particles do not expand at all. For example, with a dwell time of the printing roller of approximately 1 second and a roller temperature of approximately 145 ° C, hollow microspheres are formed only to a depth of 0.12 mm. Nevertheless, the depressions are completely filled by the solidified plastic dispersion. At a pressure roller temperature of more than 170 ° C., the dwell time is halved, and the formation of the hollow microspheres as a result of the heat is then prevented in those areas where there are no defects 3.
Ebenso wird in einer neben den Vertiefungen an der Oberfläche 4 aufgebrachten Kunststoffdispersion durch den aufgebrachten Druck die Entstehung der Mikrohohlkugeln überhaupt verhindert bzw. es werden bereits entstandene Mikrohohlkugeln derart zusammengedrückt, sodass dort, wenn überhaupt, lediglich ein nicht störender Kunststoffüberzug kaum messbarer Stärke entsteht, durch welchen die Narbenschicht des Leders nicht beeinflusst wird.Likewise, in a plastic dispersion applied next to the depressions on the surface 4, the formation of the hollow microspheres is prevented at all by the applied pressure, or already formed hollow microspheres are pressed together in such a way that, if at all, only a non-disturbing plastic coating of barely measurable thickness is created which does not affect the grain of the leather.
Etwa in einem in diesen Bereichen vorhandenen Kunststoffüberzug befindliche Mikro- hohlkugeln können weiters dadurch beseitigt werden, dass ein Gemisch aus etwa 90 Teilen Wasser und 10 Teilen Lösungsmittel, z.B. Äthylenacetat, aufgesprüht, und anschließend diese Bereiche einer Druck- und Wärmebehandlung unterzogen werden. In diesem feuchten Zustand kollabieren dann die Mikrohohlkugeln bereits bei Temperaturen unter 65 °C bei einem Druck von weniger als 0,5 kg/cm2, so dass bei dieser Vor- gangsweise die Mikrohohlkugeln einfallen oder überhaupt nicht gebildet werden. Hollow microspheres, for example, in a plastic coating in these areas can also be eliminated by spraying a mixture of about 90 parts of water and 10 parts of solvent, for example ethylene acetate, and then subjecting these areas to pressure and heat treatment. In this moist state, the hollow microspheres then collapse even at temperatures below 65 ° C. at a pressure of less than 0.5 kg / cm 2 , so that in this process the hollow microspheres collapse or are not formed at all.

Claims

Ansprüche: Expectations:
1. Verfahren zur Beseitigung von Fehlstellen (3) in der Narbenschicht (2) eines vollnarbigen Leders (1), wobei an den Fehlstellen (3) eine Kunststoffmasse aufge- bracht wird, dadurch gekennzeichnet, dass eine wässerige, gegebenenfalls leicht geschäumte, Kunststoffdispersion, welche kleinste Kompaktteilchen enthält, in die Fehlstellen (3) gedrückt und anschließend das Leder (1) getrocknet wird, worauf die Narbenschicht (2) einer Druck- und Wärmebehandlung unterzogen wird, wodurch aus den Kompaktteichen in der verfestigten Kunststoffdispersion zumindest teilweise Mikrohohlkugeln (5) gebildet werden.1. A process for eliminating imperfections (3) in the grain layer (2) of a full-grain leather (1), a plastic mass being applied to the imperfections (3), characterized in that an aqueous, optionally slightly foamed, plastic dispersion, which contains the smallest compact particles, is pressed into the imperfections (3) and then the leather (1) is dried, whereupon the grain layer (2) is subjected to a pressure and heat treatment, whereby at least partially hollow microspheres (5) from the compact ponds in the solidified plastic dispersion be formed.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, dass es sich bei Leder um Rindsleder handelt.2. The method according to claim 1, characterized in that leather is cowhide.
3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Kunststoffdispersion mittels einer, vorzugsweise gegenläufigen, gegebenenfalls eine feinstrukturierte Oberfläche aufweisenden Auftragswalze in die Fehlstellen (3) gedrückt wird.3. The method according to claim 1 or 2, characterized in that the plastic dispersion is pressed into the defects (3) by means of an application roller, preferably in opposite directions, optionally having a finely structured surface.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Druck- und Wärmebehandlung mit einer auf eine Temperatur von mindestens 100 °C, vorzugsweise zwischen 120°C und 180°C, aufgeheizten, die Narbenschicht (2) kontaktierenden Druckwalze erfolgt.4. The method according to any one of claims 1 to 3, characterized in that the pressure and heat treatment with a heated to a temperature of at least 100 ° C, preferably between 120 ° C and 180 ° C, the scar layer (2) contacting pressure roller he follows.
5. Verfahren nach Anspruch 1 , 2, 3 oder 4, dadurch gekennzeichnet, dass die Druckwalze eine feinstrukturierte Oberfläche aufweist.5. The method according to claim 1, 2, 3 or 4, characterized in that the pressure roller has a finely structured surface.
6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass Kompaktteilchen mit einer Größe von weniger als 10 μm, vorzugsweise von we- niger als 7 μm, in einer Menge zwischen 15 g und 60 g, bezogen auf 1 kg einer 40%igen Kunststoffdispersion, verwendet werden.6. The method according to any one of claims 1 to 5, characterized in that compact particles with a size of less than 10 microns, preferably less than 7 microns, in an amount between 15 g and 60 g, based on 1 kg of a 40th % plastic dispersion can be used.
7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass Kompaktteilchen aus einem thermoplastischen Kunststoff verwendet werden, die ein flüssiges Treibmittel enthalten.7. The method according to any one of claims 1 to 6, characterized in that compact particles made of a thermoplastic are used, which contain a liquid blowing agent.
8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass Kompaktteilchen verwendet werden, welche bei einer Temperatur unter 120°C, vorzugsweise unter 80°C, expandieren. 8. The method according to any one of claims 1 to 7, characterized in that compact particles are used which expand at a temperature below 120 ° C, preferably below 80 ° C.
9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass auf dia verfestigte Kunststoffdispersion ein Gemisch aus Wasser und einem Lösungsmittel, beispielsweise aus 90 Teilen Wasser und aus 10 Teilen Lösungsmittel, beispielsweise Äthylacetat, aufgebracht, vorzugsweise aufgesprüht, wird und anschließend eine Druck- und Wärmebehandlung erfolgt.9. The method according to any one of claims 1 to 8, characterized in that on the solidified plastic dispersion, a mixture of water and a solvent, for example from 90 parts of water and from 10 parts of solvent, for example ethyl acetate, is applied, preferably sprayed on, and then one Pressure and heat treatment takes place.
10. Verfahren nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass pigmentierte Kompaktteilchen verwendet werden, deren Farbe jener der Narbenschicht und/oder der Kunststoffdispersion entspricht.10. The method according to any one of claims 1 to 9, characterized in that pigmented compact particles are used, the color of which corresponds to that of the grain layer and / or the plastic dispersion.
11. Vollnarbiges Leder, welches an seiner Narbenschicht partiell Fehlstellen aufweist, die durch eine Kunststofffüllmasse korrigiert sind, dadurch gekennzeichnet, dass die Kunststofffüllmasse aus einer verfestigten, wässerigen, aus Kompaktteilchen durch Wärmezufuhr gebildeten Mikrohohlkugeln (5) enthaltenden Kunststoffdispersion besteht, die beim Auftragen in die Fehlstellen gedrückt wird.11. Full-grain leather, which partially has imperfections on its grain layer, which are corrected by a plastic filling compound, characterized in that the plastic filling compound consists of a solidified, aqueous hollow micro-spheres (5) formed from compact particles by heat supply, which consists of the application in the Missing parts is pressed.
12. Vollnarbiges Leder nach Anspruch 11 , dadurch gekennzeichnet, dass es sich um Rindsleder handelt.12. Full-grain leather according to claim 11, characterized in that it is cowhide.
13. Vollnarbiges Leder nach Anspruch 11 oder 12, dadurch gekennzeichnet, dass die Ausbildung der Mikrohohlkugeln (5) in dem der Oberfläche (4) der Narbenschicht benachbarten Bereich stärker ist als in dem dieser Oberfläche (4) entfernteren Bereich. 13. Full-grain leather according to claim 11 or 12, characterized in that the formation of the hollow microspheres (5) in the area adjacent to the surface (4) of the grain layer is stronger than in the area further away from this surface (4).
EP04790527.8A 2003-10-20 2004-10-16 Method for coating leather with dispersed synthetic resin Expired - Lifetime EP1678332B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0072703U AT7186U1 (en) 2003-10-20 2003-10-20 METHOD FOR ELIMINATING DEFECTS IN THE SCAR LAYER OF A FULL-SCARED LEATHER, AND LEATHER WHICH DEFECTS IN THE SCAR LAYER ARE ELIMINATED
PCT/EP2004/011689 WO2005040431A1 (en) 2003-10-20 2004-10-16 Method for coating leather with dispersed synthetic resin

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EP1678332B1 EP1678332B1 (en) 2013-08-14

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KR (1) KR101161036B1 (en)
CN (1) CN1875119A (en)
AR (1) AR046423A1 (en)
AT (1) AT7186U1 (en)
BR (1) BRPI0415512B1 (en)
DE (1) DE20318311U1 (en)
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WO (1) WO2005040431A1 (en)

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EP2829617A1 (en) * 2013-07-26 2015-01-28 TFL Ledertechnik GmbH Process for retanning leather
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AT4947U3 (en) * 2001-10-04 2002-06-25 Schaefer Philipp FULL-SCARFED BEEF NAPPA LEATHER AND METHOD FOR PRODUCING THE SAME

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CN101379198B (en) * 2006-02-20 2011-12-14 朗盛德国有限责任公司 Process and apparatus for applying a coating to at least one side of a leather and coated leather produced by such a process

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RU2006117192A (en) 2007-12-10
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US20070074352A1 (en) 2007-04-05
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KR20060127386A (en) 2006-12-12
AR046423A1 (en) 2005-12-07

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