Method for producing a single-sided adhesive film and single-sided adhesive film

Abstract

The invention relates to a method for producing a single-sided adhesive film (1). Said method consists of providing a support layer (2) and coating a first side of the support layer (2) with an adhesive film (3), a lubricant coating (4) is applied to a second side of the support layer (2), the support layer (2) being in the form of a polyester film. Said method is characterised in that the polyester film, prior to bonding to the adhesive layer (3), and the lubricant coating (4) is treated with trichloroacetic acid, sodium persulphate, iron chloride or copper chloride in order to increase the surface energy of the polyester film. The invention also relates to a one-sided adhesive film (1) produced according to the above-mentioned method.

Claims

1. A method for producing a single-sided adhesive film, comprising: providing a backing layer, and coating a first side of the backing layer with an adhesive layer, wherein a slip coating is applied to a second side of the backing layer, and wherein the backing layer is provided in the form of a polyester film, characterized in that prior to bonding to the adhesive layer and the slip coating, the polyester film is treated with trichloroacetic acid, sodium persulfate, iron chloride or copper chloride in order to increase the surface energy of the polyester film, wherein the slip coating comprises polyurethane and is directly sprayed onto the second side of the backing layer so that the slip coating is planar.

2. The method as claimed in claim 1, characterized in that the slip coating hardens on the backing layer and is thus fixed to the backing layer.

3. The method as claimed in claim 1, characterized in that a release film is applied to the side of the adhesive layer facing away from the backing layer.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Preferred further embodiments and aspects of the present invention are explained in further detail in the following description of the figures. The figures show the following:

(2) FIG. 1 is a schematic side view of the layer structure of a single-sided adhesive film comprising a layer of a material fulfilling particular properties such as friction reduction or improvement of wear resistance, and

(3) FIG. 2 is a schematic side view of the single-sided adhesive film of FIG. 1 with a release film.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(4) In the following, preferred examples are described with reference to the figures. Elements that are identical, similar or have the same effect are indicated by the same reference numbers. In order to avoid redundancy, repeated description of these elements is sometimes dispensed with in the following description.

(5) FIGS. 1 and 2 show a single-sided adhesive film that comprises a backing layer 2, an adhesive layer 3 and a slip coating 4 in the form of a plastic spray coating.

(6) The backing layer 2 forms an optimum basis for coating with a functional chemical compound. The backing layer 2 is a polyester film that has been treated with trichloroacetic acid in order to increase its surface energy and improve its adhesion properties. Here, the backing layer 2 is the polyester film Coveme Kemafoil HPH23. The etching treatment of the backing layer 2 with trichloroacetic acid makes it possible to provide ideal adhesion properties of the backing layer 2 with respect to the adhesive layer 3 and the slip coating 4.

(7) As an alternative to trichloroacetic acid treatment, the polyester film can also be treated with sodium persulfate, iron chloride, copper chloride and the like.

(8) Alternatively, the backing layer can also comprise materials such as polyethylene naphthalate, polyvinyl chloride, polycarbonate, papers, polypropylene webs, PET webs, cellulose- or plastic-based fabrics, laid webs, or films based on di- and triacetate or combinations of the above materials.

(9) The adhesive 3 is a dispersion acrylate such as e.g. LK-8203 from Lohmann GmbH & Co. KG. Alternatively, other adhesive systems based on dispersions or solvent-based or solvent-free pressure-sensitive adhesive, heat- or moisture-activatable systems or hotmelts based on acrylates, rubber, polyurethane, and/or silicone adhesives or blends thereof can also be used.

(10) For example, the adhesive layer 3 is suitable for securing the single-sided adhesive film 1 to conveying surfaces of piece good transportation system and the like. Such conveying surfaces generally comprise materials such as e.g. steel, aluminum, wood and/or plastic.

(11) Moreover, the adhesive layer 3 is capable of forming a long-term bond with the etched surface of the backing layer 2.

(12) The adhesive layer is arranged on the backing layer with a weight per unit area of preferably 5 to 300 g/m.sup.2, particularly preferably 50 to 250 g/m.sup.2, and most particularly preferably 80 to 200 g/m.sup.2.

(13) The slip coating 4 is polyurethane-based. In addition to the polyurethane, the slip coating comprises polyaspartic esters. One of the features of this two-component sealing system is very good abrasion resistance. An example of a two-component sealing system of this kind is VIASOL LCT 56691P from VIACOR Polymer GmbH. Furthermore, it is also possible for PTFE (Teflon), polyamides or acetates to be employed as plastic for the slip coating.

(14) In order to produce the single-sided adhesive film, the slip coating 4 is applied to the backing layer 2, for example by means of a spraying machine. The slip spray coating then hardens on the backing layer 2, wherein it undergoes long-term adhesive bonding with the surface of the backing layer 2. Alternatively, the slip coating can also be poured onto the backing layer in the form of a cast plastic layer.

(15) The layer based on the slip coating 4 possesses low friction resistance and/or wear resistant properties. The coefficient of friction μD of the surface of the slip coating is in the range of 0.1 and less.

(16) FIG. 2 shows a single-sided adhesive film 1 that is the same as in FIG. 1, except that a release film 5 is arranged on the side of the adhesive layer facing away from the backing layer 2. By means of the release film 5, the single-sided adhesive film 1 can be rolled up and then stored or transported. In order to firmly attach the single-sided adhesive film 1 to an application surface such as e.g. a conveying surface of a piece good transportation system, it is only necessary to peel off the release film 5 and press the single-sided adhesive film onto the application surface.

(17) For example, the release film 5 is a polypropylene film from the firm Infiana having a thickness of 100 μm. Alternatively, other commonly-used release liners can be used as the release film.

(18) If applicable, all of the individual features presented in the individual examples may be combined and/or exchanged with one another without departing from the scope of the invention.

LIST OF REFERENCE NOS

(19) 1 Adhesive film 2 Backing layer 3 Adhesive layer 4 Slip coating 5 Release film