Orange dyeing using transition metal pigment-based fabric carriers

Abstract

The invention relates to an adhesive tape, in particular a wrapping tape, for wrapping a cable in a motor vehicle, comprising a textile carrier and at least one adhesive layer applied on one or both sides of the carrier, the carrier being dyed with, in particular, a yellow dye, characterized in that an inorganic mineral pigment is used as the dye in whole or in part. In a preferred embodiment, the bismuthite is used as a pigment having a phosphate, arsenate or vanadate mineral class.

Description

[0001] This application is a divisional application of patent application number 201880073379.5.

[0002] The invention relates to an adhesive tape, in particular a wrapping tape, for wrapping cables in automobiles, comprising a textile carrier and at least one adhesive layer applied to one or both sides of the carrier, wherein the carrier is dyed with a dye.

[0003] Dyeing of textile carriers in adhesive tapes has been practiced for several years. Historically, pigments based on inorganic carbon black, which have been used as additives in extrudates, have been used. For example, filaments and filament wovens can be produced from extrudates. Further details regarding the inorganic pigments used are not given (see WO 03 / 033611).

[0004] In another adhesive tape, according to EP 2546317 A1, the textile carrier is dyed with a mixture of dyes and / or pigments. The mixture itself consists of yellow and red dyes or pigments. The yellow dye is based on anthraquinone, while the red dye is composed of an azo compound. Alternatively, the red dye can also be a mixture of anthraquinone compounds and azo compounds.

[0005] Usually, according to the According to the Chemie Lexikon, 9th edition, 1993, page 1301, the term "dye" is a collective term for colorants that are soluble in solvents and / or binders. Dyes are thus contrasted with insoluble pigments, which are inferior to dyes in terms of quantity, structural variation, and generally also in terms of luminescence intensity.

[0006] according to" According to the explanation in Chemie Lexikon, 9th edition, 1993, page 3439, "pigment" is to be understood as meaning an inorganic or organic coloring or non-coloring coloring agent which is virtually insoluble in the application medium. Therefore, based on these definitions, a distinction is made below between dyes on the one hand and pigments on the other hand.

[0007] Industrial adhesive tapes with a strip-shaped textile dye carrier are the ultimate subject of EP 1,607,459A1. Here, the textile carrier is specifically composed of filaments or fibers that are dyed through a spinning nozzle. Often, black dyeing is performed using a material based on carbon black.

[0008] The dyeing of adhesive tapes or their carriers by means of dyes is becoming increasingly important because, when such adhesive tapes are used as wrapping tapes for wrapping cables in cars, there is an increasing demand that these wrapping tapes also provide a complementary warning or indicator function in addition to their original function of bundling and restraining cables.

[0009] For example, in hybrid or electric vehicles, it is known that all cables or cable bundles approaching voltages greater than 60 volts must be orange. In this context, the color RAL 2003 (light orange) was designated as the standard color in 2010. EP 2 546 317 A1 addresses this situation by using a mixture of the aforementioned yellow pigments, based on anthraquinone, and the red pigments, based on azo compounds.

[0010] The procedure known from EP 2546317 A1 is not without its drawbacks. A problem still exists with known organic dyes, which can cause discoloration or fading of the dye, the carrier, and thus the adhesive tape as a whole, due to thermal effects and / or aging. This is particularly detrimental in the long term, as it can reduce the warning effect or, due to unavoidable contamination in the area, even completely eliminate it. This is the starting point of the present invention.

[0011] The technical problem underlying the present invention is to further develop such adhesive tapes, and in particular wrapping tapes for wrapping cables in motor vehicles, in such a way that in particular the long-term stability and temperature stability can be improved and a continuous warning effect can be achieved.

[0012] In order to solve this technical problem, the present invention proposes to use inorganic mineral pigments as dyes in adhesive tapes of this type, and in particular in wrapping tapes for wrapping cables in automobiles, in whole or in part.

[0013] The inorganic mineral pigments provided according to the invention, which form dyes in whole or in part, are advantageously those of the oxide and hydroxide mineral classes. Alternatively or additionally, phosphates, arsenates, or vanadates of the mineral classes are used as inorganic mineral pigments. The classification and nomenclature of the mineral classes is carried out in accordance with the "Mineral Classification" according to Strunz (8th edition).

[0014] Pyrochlore, or rutile, is commonly used as a pigment in the class of oxide and hydroxide minerals. Pyrochlore typically crystallizes in the cubic system and forms octahedral crystals, often with brown, red, orange, or yellow colors. Rutile is a mineral that typically crystallizes in the tetragonal system.

[0015] Particularly preferably, metal-based pyrochlores or rutiles are used as pyrochlores or rutiles, and in particular transition-metal-based pyrochlores or rutiles are used here. In other words, the minerals in question, i.e., pyrochlores or rutiles, are used in such a way that transition metals are incorporated into their crystal lattices, such as those based on niobium or zinc. In other words, niobium-tin-based or tin-zinc-based pyrochlores or rutiles are preferably used as transition-metal-based pyrochlores or rutiles.

[0016] Klinobisvanite is particularly advantageous as a pigment from the mineral class of phosphates, arsenates, or vanadates. Such klinobisvanite belongs to the group of anhydrous phosphates without foreign anions and typically has a yellow to orange color. Preferably, the inorganic mineral pigment has an overall yellow color.

[0017] In this way, the present invention firstly utilizes the fact that such inorganic mineral pigments, due to their crystal structure, are typically stable at high temperatures and also have high color fastness. This can be attributed to the special structure and stability of the crystals or minerals used in this regard. In fact, the pigment in question and the carrier or adhesive tape produced therefrom tested in accordance with standard LV 312 ("Schutzsys teme für in Kraf tfahrzeugen, Prüfrichtlinie" 10 / 2009) is temperature-stable over a period of 3000 hours, specifically considering temperatures that can be significantly greater than 150° C., often even 200° C. or even 250° C. This means that, considering dyes using the inorganic mineral pigments according to the invention as carriers, at least temperature class T4 according to standard LV 312 is achieved, as is generally explained in EP 2 546 317 A1 already cited above.

[0018] Examples of suitable inorganic mineral pigments, in particular in the form of niobium tin pyrochlore (NTP), are provided in particular by the company "The Shepard Color Company" and in the color yellow. Reference is made in this regard to US Pat. No. 8,192,541 B2.

[0019] As another suitable pigment from the rutile group, the so-called "Pigment Yellow 53, nickel phthalate" has proven particularly advantageous. In the case of pyrochlore, "Pigment Yellow 227" is used, and in the case of clinovanadium, "Pigment Yellow 184, bismuth vanadate" is used, for example. These pigments are available, for example, from Habich GmbH, A-3652 Leiben, under the trade name "Duropal."

[0020] Very particularly preferred is an embodiment of the present invention in which the dye is formed as a mixture of a yellow inorganic mineral pigment and a red organic pigment. For this reason, alternatively, the dye can also be formed as a mixture of a yellow inorganic mineral pigment and a red inorganic pigment. The red organic pigment is advantageously that from the perylene class, although other classes are of course also contemplated. If red inorganic pigments are used, the present invention again recommends the use of those from the perylene group. The red pigments mentioned are also provided by the above-mentioned company Habich under the trade name Duropal.

[0021] Yellow dyes can be achieved based on inorganic mineral pigments, for example using yellow niobium-tin-pyrochlore minerals. Although inorganic mineral pigments are typically present and used for yellow colors, red organic pigments can also be used if the dye is a mixture of a yellow inorganic mineral pigment and a red organic pigment. As an alternative to the above-mentioned red organic pigments from the perylene group, red pigments from azo compounds can also be used.

[0022] In any case, an orange coloring of the support and thus of the adhesive tape as a whole can be achieved with the aid of the dyeing effected in this way as a mixture of yellow inorganic mineral pigments and red organic or inorganic mineral pigments.

[0023] In particular, the color RAL 2003 (Pastel Orange) required for the above-mentioned applications can be specified and adjusted. Organic pigments based on azo compounds are compounds which are described in principle in EP 2 546 317 A1, to which reference is made here.

[0024] The dyeing of the carrier can in principle be carried out in the sense of spin-die dyeing, ie in such a way that the dye is added to the extrudate and penetrates into the fibers produced therefrom during the extrusion process and is used in this way for dyeing.

[0025] The preferred spin-die dyeing is carried out in such a way that the dye or pigment generally has a particle size of less than 0.5 mm, in particular less than 100 μm and preferably less than 50 μm. Furthermore, mixtures of inorganic mineral pigments and organic pigments have proven advantageous if the mixing ratio is in the range of 20:80 to 80:20 by weight of inorganic pigment to organic pigment. Finally, it is provided that during the spin-die dyeing process, the pigment in the extrudate is generally present in a concentration of 0.2 to 3.0% by weight (based on the polymeric spinning mass) and is then extruded together with the polymeric spinning mass.

[0026] In addition, so-called monolithic dyeing, for example by dyeing the carrier in dispersion In principle, this is also possible. Dyeing can be carried out from aqueous solutions of the pigments, if necessary with the additional use of auxiliaries, as in principle described in EP 2546317 A1. However, the invention generally uses spinnerets for dyeing.

[0027] The carrier is at least partially constructed from polyester, polypropylene, polyethylene, or polyamide fibers. Particularly preferably, the carrier consists of polyester fibers. In principle, any type of textile carrier has proven advantageous, such as a nonwoven, a woven fabric, or even a mesh. Furthermore, in principle, multilayer carriers, such as those composed of nonwovens or woven fabrics, are also conceivable in this manner and can be produced and dyed in the manner described.

[0028] The weight of the carrier may generally be up to 200 g / m 2 and preferably even up to 500 g / m 2 For adhesives or adhesive layers produced in this way, at 20 g / m 2 Up to 200g / m 2 Applied weights within a range are generally considered to be particularly advantageous.

[0029] For the realization of the adhesive layer, the invention proposes an adhesive based on natural rubber or synthetic rubber. Particularly preferred are adhesives based on acrylates, and in particular acrylate melt adhesives which can be crosslinked, for example, by UV.

[0030] Adhesive tapes produced in this manner are particularly advantageous for use as wrapping tapes for wrapping cables in automobiles. For this purpose, the wrapping tape in question is wound helically around a longitudinally extending cable. However, this method can also be used to produce an axial protective sheath for the cable in question. In this case, the longitudinally extending cable is wrapped axially using the adhesive tape or the protective sheath produced in this manner.

Claims

1. An adhesive tape, in particular a wrapping tape, for wrapping cables in automobiles, comprising a textile carrier and at least one adhesive layer applied to one or both sides of the carrier, wherein the carrier is dyed with a dye and wherein inorganic mineral pigments are used in whole or in part as dyes, characterized in that The dye is formed as a mixture of a yellow inorganic mineral pigment and a red organic pigment, wherein the red organic dye is a red organic pigment of the perylene type. 2 . The adhesive tape according to claim 1 , wherein the inorganic mineral pigments are of the oxide and hydroxide mineral type and / or of the phosphate, arsenate or vanadate mineral type. 3 . The adhesive tape according to claim 2 , wherein pyrochlore or rutile is used as pigment from the group of oxide and hydroxide minerals. 4 . The adhesive tape according to claim 2 , wherein bismuth vanadate is used as pigment from the group of phosphate, arsenate or vanadate minerals. 5 . The adhesive tape according to claim 1 , wherein the inorganic mineral pigment is used as a dye for the carrier, achieving at least temperature class T4 according to standard LV 312.

6. The adhesive tape according to claim 1, wherein the individual filaments of the textile carrier are dyed with a dye.

7. The adhesive tape according to claim 1, wherein the carrier is at least partially composed of polyester, polypropylene, polyethylene or polyamide fibers.

8. Adhesive tape according to any one of claims 1 to 7, characterised in that the adhesive coating is an adhesive based on natural rubber, synthetic rubber, acrylate, and preferably an acrylate melt adhesive.