EP1077620B1 - Pressure-sensitive fastening part - Google Patents

Abstract

An adhesive closure part for foaming with upholstery parts of vehicle seats during their production comprising a substrate with a plurality of adhesive elements. A bonding agent produces a bonding with the pertinent foam material. The bonding agent is made of an adhesive that is selected to accommodate when the adhesive closure part is made of either a polyamide or a polyolefin material.

Description

The invention relates to an adhesive fastener part, in particular for foaming upholstery parts of vehicle seats in their manufacture, with adhesive elements on one Side for connection to corresponding adhesive elements of another adhesive fastener part forming an adhesive fastener and with a lanyard on the other side of the fastener part for establishing a connection with the respective foam material, wherein the connecting means from one on the other side of the fastener part applied adhesive and where the fastener part made of a polyamide or a polyolefin material is formed.

Comparable adhesive fastener parts are known from EP-A-0 612 485, the Adhesive fastener part is inserted in a foam mold such that the connecting means in the form of loop elements on the back of the fastener part with the respective foam material for establishing a firm connection with it come into contact. The opposite front of the fastener part has the adhesive elements in the form of connecting hooks, adhesive heads or the like. on the are protected against the ingress of foam material, for example by as described in the European Script, from an uncrosslinked thermoplastic plastic are completely surrounded. After the foaming process in the form and Removing the foamed part from the cover removes the adhesive elements free and can later with adhesive elements of another adhesive fastener part, for example in the form of a loop band, forming a conventional one Fastener are connected.

In this way, for example, upholstery materials can be made Define foamed upholstery parts of a motor vehicle seat or passenger seat or rotating components, for example in the form of grinding wheels with tool holders connect to conventional grinding machines and devices. The foam material mentioned can depend on each The object to be molded must be extremely fluid and viscosities have, which are in the range of water or below. It has now shown that when using loop and loop material as a connecting means or even when using adhesive fleece or the like. the open ones Loops are not completely penetrated by the foam material, but rather form a kind of barrier for this, which prevents penetration inhibits the foam material. Subsequent curing or Baking process for the foam material then occurs at the transition points between the loop material and the foam to blowholes, thus to gaseous hollow inclusions, which form a firm connection counteract between the adhesive fastener part and the foam material. Because of the reduced strength of the connection between the fastener part and foam material is particularly common in long-term use to loosen the connection and the hard closure part tears out of the foam material, which overall makes the entire component, for example in the form of a vehicle seat or Grinding wheel holder.

EP-A-0 461 777 discloses a generic, multi-layer adhesive fastener part in which U-shaped hooking elements are received with their foot part in a first layer of the fastener part. This is followed by a second layer of transparent viscous-elastic material, the layer composite in question being able to be glued to a corresponding object via a third additional layer in the form of a pressure-sensitive adhesive, for example in the form of a commercially available acrylate adhesive.
From WO-A-96/19338 a further generic fastener part is known, the fastener material or the like using a hot-melt adhesive on its underside with a foam material of a cushion part. is firmly connectable. Although very highly effective adhesive compounds are used in the prior art, such as pressure-sensitive adhesives or so-called hot-melt adhesives, it is nevertheless surprising that fastener parts fixed to a foam material in this way often tear, in particular when used appropriately, sometimes together with the foam material , in which the hard closure part is glued.

Starting from this prior art, the invention is based on the object to further improve a fastener part such that a safe and high strength Connection between the hard closure part and the foam material used in each case is achievable. An object of this kind is solved by a fastener part with the Features of claim 1.

Characterized in that according to the characterizing part of claim 1 that, if the The fastener part is made of a polyamide material, the primer is made of resorcinol and / or at least one of its derivatives, and that if the adhesive fastener part consists of a polyolefin material, polyurethane as an adhesive base or a polymer is used, which has a post-crosslinking of curable Resins arises, a kind of primer layer is formed on the adhesive fastener part a high-strength connection with the respective foam material is made and thus even without glue a secure, difficult to detachable connection between the adhesive fastener part and the later foam body guaranteed.

It is for a specialist in the field of fasteners and foaming technology surprisingly, that he omitted the usual adhesive layers alone by applying the respective adhesive primer according to the invention on the Hard closure part, whereby a very thin layer (<0.1 mm) is formed is achieved, a better connection to the foam material than by means of the known Solutions, which also include the loop fabric described at the beginning, which is complex and therefore expensive to manufacture and in which the Loops penetrate and penetrate far into the foam material. Instead of one mechanical interlocking of loop or loop material with the foam or a corresponding adhesive application, is about the adhesive primer used in each case and the primer layer after the solution according to the invention has an adhesion to the foam material in its manufacture under heat and pressure, what leads to higher strength values for the desired connection.

If, in a particularly preferred embodiment, the respective primer is provided with a ferromagnetic material, it can Insert the removable fastener part into the metallic foam mold and will over magnetic forces positioned in the inserted position within the mold. On this way, the insertion of the ribbon-like can be particularly inexpensive Reach the fastener part in foam molds.

Fig.1 bis 3

jeweils ein Haftverschlußteil mit verschiedenen Haftgrundmitteln und das Verfahren zum Auftragen desselben.

The adhesive fastener part is explained in more detail below with the aid of various exemplary embodiments and associated manufacturing processes.
In principle, they show the

Fig. 1 to 3

each a fastener part with various primers and the method for applying the same.

The presented fastener part serves in particular for foaming Upholstery parts of vehicle seats (not shown) during their manufacture. The tape-like fastener part, but also surface geometries can form, has on one side adhesive elements 10 for connecting with corresponding adhesive elements of another adhesive fastener part (not shown) with the formation of a conventional adhesive fastener. That in FIG. 1 to 3 illustrated fastener part is manufactured using a conventional method, as shown for example by DE 196 46 318.1. On the other or on the underside of the adhesive fastener is for making a connection a connecting means 12 is provided with the respective foam material. The connecting means 12 consists of an applied primer, So from a so-called primer layer.

Adhesive primer is the name for media that promote adhesion Painting or coating. They are extremely fluid and therefore sprayable and brushable. This results in very thin layers (0.005 to 0.008 mm). Their liability-mediating effect is based on the chemical reaction of their components with each other and with the respective Surfaces made of metal or plastic, for example, which is why The term "reaction primer" is common. Adhesive primers result usually a glazing layer. Primers are generally used as primers designated with an adhesive effect. They are also sometimes called Reaction primer referred to and assigned to the primers.

The adhesive fastener part itself is made of a polyamide or a polyolefin material educated. Polyamide is the collective name for high molecular weight Compounds made up of building blocks linked by peptide bonds (Amides) exist. Common polyamides such as PA6 can be used as the polyamide material or PA66 can be used. To structure the labeling system for Polyamide according to ISO or DIN 16 773 T1 also becomes synonymous with polyamide Nylon used as a generic name (original trademark of Du Pont for PA66). Especially in the English-speaking area is also the structure-related IUPAC nomenclature common, e.g. Poly [imino (1-oxohexamethylene)] for PA6 and poly [imino (1,6-dioxohexamethylene) iminohexamethylene] for PA66. Because of their special property, polyamides are used contain only aromatic residues (e.g. those made from p-phenylenediamine / terephthalic acid) summarized under the generic name aramide, as they are on the market, for example, under the brand name Nomex are available. More recent developments in this area are block copolymers of polyamides with polyethers that are both thermoplastic and Have elastomer properties.

dar, in der R¹ meist für Wasserstoff und R² für Wasserstoff, eine geradkettige oder verzweigte gesättigte aliphatische bzw. eine cycloaliphatische Gruppe stehen können. Gelegentlich werden auch Polymere mit aromatischen Gruppen, z.B. dem Phenyl-Rest (R²=C₆H₅, siehe Polystyrol) zu den Polyolefinen gerechnet. Produkte mit R¹ = H werden auch als Poly(α-olefin)e bezeichnet; sie können als Vinyl-Polymere betrachtet werden.Polyolefins are the general term for polymers of the general structure

represents, in which R ^{1 is} mostly hydrogen and R ^{2 is} hydrogen, a straight-chain or branched saturated aliphatic or a cycloaliphatic group. Occasionally, polymers with aromatic groups, for example the phenyl radical (R ² = C ₆ H ₅ , see polystyrene) are also classed as polyolefins. Products with R ¹ = H are also referred to as poly (α-olefin) e; they can be viewed as vinyl polymers.

Polyolefins with great technical importance in the field of fasteners are, for example, polyethylenes, polypropylenes, polybutenes, the occasionally misleading also called polybutylenes or polybutenes as well as polyisobutenes and poly (4-methyl-1-pentene) e. Polymers of the higher α-olefins, e.g. However, poly (1-hexene), poly (1-octene) or poly (1-octadecene) have So far, only very limited technical application has been found in this field. The polyolefins also include copolymers of different olefins, e.g. that of ethylene with propylene.

Fig.1 relates to an adhesive fastener part made of polyamide material. That here The adhesive primer used as a primer layer later becomes a firm bond with the foam during its production by means of pressure and / or heat one on hydrogen bonding and with the involvement of Van der Waals forces. Adhesive forces also act. This means the Adhesion between a solid interface and a second phase, the either from individual particles, molecules, droplets or powders or can consist of a continuous liquid or solid film. The Adhesion can be caused by electrostatic forces, by van der Waals forces (this belong to the intermolecular forces) or even through real chemical ones Binding (e.g. in the case of chemisorption). It is the cause of the Sorption, both the adsorption at an interface and the absorption in an interface layer. The primer consists of resorcinol and / or one of its derivatives, for example from alcoholic Solutions can be applied. Resorcinol or (1,3-dihydroxybenzene, 1,3-benzenediol) forms and has large colorless, sweet-tasting needles a melting point between 109-111 ° and a boiling point of 280 °. Resorcinol is in water, alcohol, for example in the form of ethanol, ether and Glycerin is slightly soluble in chloroform and carbon disulphide. It serves in the present case as an adhesion promoter for the polyamide material. As an application device an applicator roller 14, which consists of a bath 16 taking the resorcinol uniformly on the underside of the band-shaped Applying the fastener part. In the present embodiment, 70g Resorcinol used in 930g ethanol, the adhesive tape with 12 m in the minute is guided along the roller 14. Rule in a drying tunnel 18 approx. 70 ° C for the drying process.

als charakteristische Grundeinheiten der Basis-Makromoleküle. In vielen Fällen werden Polyurethane als Prepolymere mit terminalen Isocyanat-Gruppen hergestellt, die bei der Anwendung mit Feuchtigkeit aus der Umgebung unter Kettenverlängerung und gegebenenfalls Vernetzung aushärten. Derartige Prepolymere können auch mit Diaminen kettenverlängert werden, wobei Polyurethane entstehen, die Harnstoff-Gruppen enthalten. NCO-terminierte Prepolymere spielen eine wichtige Rolle bei der Herstellung von Polyurethan-Dispersionen. Je nach Wahl und stöchiometrischem Verhältnis der Ausgangsstoffe gelangt man zu Polyurethan sehr unterschiedlicher mechanischer Eigenschaft, die auch als mehr oder weniger harte Elastomere in Faserform oder als Polyether- bzw. Polyesterurethan-Kautschuk als duroplastische Gießharze (auch glasfaserverstärkt) und vor allem als Schaumkunststoffe eingesetzt werden können. Bei dem in der Fig.2 dargestellten Auftragsverfahren wird das Polyurethanmaterial über eine Auftragdüse 20 auf die Unterseite des Haftverschlußteils mit den Haftelementen 10 aufgebracht. Es findet also ein Polyurethan-Beschichtungsverfahren statt, wobei wiederum im Trockenkanal 18 nunmehr bei 100°C der Trockenprozeß stattfindet und die Transportgeschwindigkeit beläuft sich auf 6 Meter pro Minute . Als Beschichtungsmaterial werden 700 g SU-9182 der Firma Stahl eingesetzt sowie 300 g Fe der Korngröße < 10µ als ferromagnetisches Material. Mit dem derart hergestellten Haftverschlußteil ist dieses dann in metallischen Einschäumformen über die Magnetwirkung des Ferromaterials lösbar zu befestigen. Ferromagnetika ist die Bezeichnung für solche magnetischen Werkstoffe, die Ferromagnetismus zeigen, wobei die Magnetisierung unter dem Einfluß eines äußeren Magnetfeldes eintritt. Nur bei Temperaturen unterhalb der Curie-Temperatur ist ein Stoff ferromagnetisch, wobei heute üblicherweise zu den Ferromagnetika auch Elemente wie Eisen, Cobalt, Nickel und Legierungen dieser Komponenten (Heuslersche Legierungen) zugerechnet werden.In the embodiment according to FIG. 2, polyurethane or a polyurethane composition is used as the adhesive base, the adhesive fastener again being formed from a polyamide material. Polyurethanes are the general term for polymers (polyadducts) with groups of the type which are accessible by polyaddition from dihydric and higher alcohols and isocyanates

as characteristic basic units of the basic macromolecules. In many cases, polyurethanes are produced as prepolymers with terminal isocyanate groups which, when used, cure with moisture from the environment with chain extension and optionally crosslinking. Such prepolymers can also be chain-extended with diamines, producing polyurethanes which contain urea groups. NCO-terminated prepolymers play an important role in the production of polyurethane dispersions. Depending on the choice and stoichiometric ratio of the starting materials, polyurethane can have very different mechanical properties, which can also be used as more or less hard elastomers in fiber form or as polyether or polyester urethane rubber as thermosetting casting resins (also glass fiber reinforced) and above all as foam plastics can. In the application method shown in FIG. 2, the polyurethane material is applied to the underside of the adhesive fastener part with the adhesive elements 10 via an application nozzle 20. A polyurethane coating process therefore takes place, the drying process again taking place in the drying duct 18 at 100 ° C. and the transport speed being 6 meters per minute. 700 g of SU-9182 from Stahl are used as coating material as well as 300 g of Fe of grain size <10µ as ferromagnetic material. With the adhesive fastener part produced in this way, it can then be detachably fastened in metallic foam molds via the magnetic effect of the ferromaterial. Ferromagnetics is the name for such magnetic materials that show ferromagnetism, the magnetization occurring under the influence of an external magnetic field. A substance is ferromagnetic only at temperatures below the Curie temperature, with elements such as iron, cobalt, nickel and alloys of these components (Heusler alloys) usually being added to the ferromagnetics today.

The embodiment according to FIG. 3 relates to an adhesive primer Polymers by post-crosslinking, for example by radiation by means of UV lamp 22 of curable resins, such as epoxy compounds. Hardening via ionizing rays is also called lacquer hardening designated. Epoxy resins in particular can be used well as curable resins. In the case of lacquer curing, hardening of those applied in the liquid state takes place Adhesive primers or primers for stable surface layers. polymerizable Paint systems can use ultraviolet radiation or other ionizing Radiation can be cured. For UV networking via UV lamps 22 mercury vapor lamps are usually used as light sources, which are also suitable for acrylic and certain polyester paints. Varnish curing by electron beams (ESH, EBC) can contain monomers Polymerize paints into hard, resistant films. The polymerization takes place in fractions of a second.

In the present embodiment, 873 g of the material sold under the brand name Uvacure 1534, 97 g tripropylene glycol and 30 g FX-512 are used as the epoxy resin composition. The application takes place via a doctor device 24 and the belt speed amounts to 8 m / min for the adhesive fastener part. The ultraviolet lamp 22 generates 120 watts per cm ² .

If the respective fastener part is formed from a polyolefin active ingredient, this can be coated in accordance with the method according to FIGS. 2 and 3. In this respect, the statements made above also apply to a related one Polyolefinverschluß.

Claims (6)

1. Fastening closure element, in particular for foaming-in padded elements of vehicle seats in the manufacture thereof, having fastening elements (10) at the one side for connection to corresponding fastening elements of another fastening closure element to form a fastening closure, and having a connection means (12) at the other side of the fastening closure element in order to produce a connection to the foam material, the connection means (12) comprising a bonding primer, which is applied to the other side of the fastening closure element, and the fastening closure element being formed from a polyamide material or a polyolefin material, characterised in that, if the fastening closure element comprises a polyamide material, the bonding primer comprises resorcinol and/or at least one of the derivatives thereof, and in that polyurethane or a polymer, which is produced by means of subsequent cross-linking of curable resins, is used as the bonding primer if the fastening closure element comprises a polyolefin material.
2. Fastening closure element according to claim 1, characterised in that the curable resin is an epoxy resin.
3. Fastening closure element according to claim 1 or claim 2, characterised in that the bonding primer is applied as a sheet in a thin uniform layer, in particular by means of a spreader apparatus (16), a spray apparatus (20) or a doctor apparatus (22).
4. Fastening closure element according to any one of claims 1 to 3, characterised in that the bonding primer is provided with a ferromagnetic material.
5. Fastening closure element according to any one of claims 1 to 4, characterised in that the fastening elements (10) thereof comprise individual fastening heads which are constructed to be planar and of equal height at the head side.
6. Fastening closure element according to any one of claims 1 to 5, characterised in that it is in the form of a continuous belt or planar material.

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