WO2011157504A1 - Ruban adhésif simple face avec pellicule support - Google Patents

Ruban adhésif simple face avec pellicule support Download PDF

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Publication number
WO2011157504A1
WO2011157504A1 PCT/EP2011/057932 EP2011057932W WO2011157504A1 WO 2011157504 A1 WO2011157504 A1 WO 2011157504A1 EP 2011057932 W EP2011057932 W EP 2011057932W WO 2011157504 A1 WO2011157504 A1 WO 2011157504A1
Authority
WO
WIPO (PCT)
Prior art keywords
sided
carrier
adhesive
tape according
film
Prior art date
Application number
PCT/EP2011/057932
Other languages
German (de)
English (en)
Inventor
Mark HÄNLE
Matthias Seibert
Michael Stromann
Original Assignee
Tesa 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 Tesa Se filed Critical Tesa Se
Publication of WO2011157504A1 publication Critical patent/WO2011157504A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
    • C09J123/04—Homopolymers or copolymers of ethene
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
    • C09J7/241—Polyolefin, e.g.rubber
    • C09J7/243—Ethylene or propylene polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
    • C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
    • C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/20—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself
    • C09J2301/204—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive itself the adhesive coating being discontinuous
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2423/00—Presence of polyolefin
    • C09J2423/04—Presence of homo or copolymers of ethene
    • C09J2423/046—Presence of homo or copolymers of ethene in the substrate

Definitions

  • the invention relates to an at least one-sided tacky tape with a film carrier and its use as a sliding adhesive tape.
  • Such a panel can be fixed by a curing adhesive, a permanent adhesive adhesive or by a positive connection.
  • the present invention is concerned only with the latter possibility; For example, there are folds on the panel, which engage in a correspondingly shaped recess in the metal sheet or in a counterfold and hook it with this or this.
  • paneled body panels often produce creaking noises which are perceived as disturbing by the sought-after prospect for a new car. Because the B-pillar of a body of the courtesy customer on a test drive particularly close to one of his ears, the sensitivity to noise generated there is particularly high.
  • the inventors have first theoretically penetrated the problem and have thus come to the conclusion that the shear difference produced by a diaphragm and sheet - regardless of whether triggered by temperature or voltage fluctuation - shear stress is not degraded by a continuous sliding but a discontinuous, namely divided into a large number of individual quanta.
  • the energy released by the sliding of such a quantity depends not only on the height of the "coefficient of friction" as previously believed, but also depends on the difference between the coefficient of static friction and the coefficient of sliding friction, because the inventors have recognized that a sliding quantum only when the shear stress exceeds the static friction, the sliding does not go as far as complete relaxation but only until the sliding friction can keep the balance of the remaining shear stress in equilibrium the process, so it releases more energy quantum almost abruptly, and these repetitions occur so often, until finally the remaining shear stress is below the sliding friction.
  • the invention thus teaches the departure from the usual expert opinion that among the polymeric sliding materials PTFE is the best and therefore also for the creaking noise suppression is best suited.
  • a systematic series of experiments according to this new criterion has rather proven an extremely high molecular weight polyethylene as optimum. In its most extreme form, this material can no longer be produced by blowing (least suitable), calendering or extruding but only by scraping off the surface of a solid cylindrical rod similar to the veneer extraction from a tree trunk.
  • the never entirely avoidable scoring scores do not increase the difference between the two coefficient of friction squares. Planing even seems to have a favorable effect on the friction properties.
  • PVDF Polyvinylidene fluoride
  • PETP Polyethylene terephthalate
  • the material PE-UHMW selected as the most suitable with the new criterion, is an ultra high molecular weight polyethylene (> 3 * 10 6 g / mol).
  • PE-UHMW is prepared from ethene with Ziegler-Natta catalysts, usually as powders with particle diameters of 100 to 200 ⁇ m. Due to its high molecular weight PE-UHMW has a very high viscosity and is therefore not conventional Modifiable and formable for ordinary thermoplastics. Although it can be extruded through a very wide nozzle, but never to the thinness required for film production. Because of their large thickness, annular extrudates can not be brought to the necessary thinness by a subsequent, expanding blowing in cross-section.
  • This material can be made only from the gel state by molding to a shape that suits as a semi-finished product. Film production from this material is only possible by planing a straight semifinished product or peeling off the lateral surface of a cylindrical semifinished product.
  • the film thus forms in a sectional area transversely to the longitudinal direction of the resulting sliding adhesive tape - which coincides with the circumferential direction of the shelled cylindrical semi-finished - at least partially the lateral surface of a circular cylinder, wherein the extent to which this lateral surface is closed depends on the height of the voltages . At low voltages results in only a small section, at high voltages, the lateral surface can be almost closed. This effect is undesirable in previously known films. As can be seen for example from DE 32 30 341 A1, complex measures are taken to prevent the curling of the film; There, the film is embossed in a predetermined manner.
  • the self-adhesive is preferably based on polyacrylates or polyurethanes or rubbers such as natural rubber.
  • Acrylate-based products of BASF which are available under the name acResin UV or Acronal®, in particular Acronal® DS 3458, have proved particularly suitable as pressure-sensitive adhesive for this sliding strip.
  • These low-molecular-weight PSAs of low K value obtain their application-oriented properties by means of a final radiation-induced crosslinking.
  • the thickness of the adhesive strip is preferably between 20 and 400 ⁇ m, more preferably 100 ⁇ m.
  • Fig. 4 in the diaphragm manufacturer reached ready for delivery to the car manufacturer states the second, particularly preferred variant of the product according to the invention together with the diaphragm and
  • Fig. 5 in a state occurring at the car manufacturer between its assembly start shown in Figure 4 and the completion of its assembly shown in Figure 2, the most preferred variant.
  • the at least one-sided tacky tape with particularly Knarzdämpfendem film carrier shown in exaggerated thickness in all figures.
  • Figure 1 shows in its center fragmentary the B-pillar 3 of a car body, namely a raised elongate portion 31, which is also referred to as Gegenfalz.
  • This Jacobfalz 31 U-shaped embracing a fold 21 of a panel 2 is shown, which is to disguise the B-pillar 3.
  • a permanently tacky band 1 with a carrier 11 and a self-adhesive mass 12 applied over the entire area is arranged between fold 19 and counterfold 31. Because of this its function, the permanently sticky tape 1 is addressed in the context of this application as a "sliding belt".
  • the permanently sticky tape 1 is already mounted by the panel manufacturer, to which the permanently sticky side 12 of the tape 1 is turned to the panel 2. Consequently, the carrier 1 1 of the permanently tacky tape 1 is turned to the body-side Gegenfalz 31 so that it arrives at the friction pairing between it and the carrier 1 1.
  • the permanently sticky tape 1 it is technically possible as well - as not shown here - to have the permanently sticky tape 1 from the manufacturer of the B-pillar 3 - so the Autohersteiler - mount, including the permanently sticky side 12 of the band 1 of the B-pillar 3 would have to be facing.
  • the carrier 1 1 of the permanently tacky tape 1 would be associated with the corresponding aperture 2 fold 21, so that it would affect the sliding properties between the carrier 1 1 and the fold 21 of the diaphragm 2, which often consists of polymethymethacrylate (PMMA).
  • PMMA polymethymethacrylate
  • the embracing of the fold 21 to the Jacobfalz 31 can also be performed on the Umschlingungswinkel shown by 180 °, so as to allow, dispensing with further fasteners mounting only by clipping.
  • Figure 2 shows a pertinent modification of the embodiment of Figure 1, that the self-adhesive composition 12 of the permanent adhesive tape 1 is not applied over the entire surface but only as a comparatively narrow strip, as seen in the figure below right.
  • this variant corresponds to the application WO 2010/046292 A1.
  • the non-self-adhesive 12 coated part of the tape 1 is also called flag 13 in this application.
  • the adhesive freedom of the flag 13 facilitates their wrinkle-free insertion even in angled geometries.
  • the adhesive strip consists of a double-sided adhesive tape, which is laminated to the carrier 1 1.
  • the application of self-adhesive composition is also possible by processes known from the printing industry, in particular by screen printing. The latter is to be considered in particular for larger parts and for final assemblies executed only by robots, because the surface areas which remain free between the densely spaced but not mutually extending adhesive points prevent the formation of gas bubbles.
  • a method according to DE 103 09 447 A1 is possible, according to which a carrier web is guided past a dipping roller which is in contact with the carrier web, the roll is rotated in a bath with an adhesive, whereby the adhesive is transferred to the roll surface, and the roll is formed by grooves or a corresponding dephasesive coating such that after the roller passes through the bath on the roll surface at least an adhesive tape is present, which is transferred to the carrier material.
  • the end 14 of the flag 13 comes - as shown here - preferably as a line contact with the adjacent component, here the inside of Blendenfalzes 21.
  • Such a defined contact pressure of the end of the film prevents namely the formation of rattling noises.
  • the description of Figure 3, in the introduction, was confronted with the fact that ultrahigh molecular weight polyethylene has proved to be the material with which the smallest difference between the squares of the two coefficients of friction - ie static friction - and sliding friction coefficient - is achievable, a material that is not processable into films with the customary for film production process such as extrusion and / or blowing or calendering. With this material, this is only possible with a method that corresponds to peeling a veneer from a tree trunk.
  • the foils produced in this way are not exactly present in a constraint-free environment, but wind up along their longitudinal direction. If they are prevented at the longitudinal rewind - for example, by an application of self-adhesive and even more by the application of a liner on it - they roll up in the transverse direction.
  • This effect which invites any person skilled in the application of just such a film as a carrier of a usually flat adhesive tape - is shown in FIG.
  • the angle ⁇ can be used. Its size depends on the bandwidth, the diameter of the "trunk" from which was planed, the Strip thickness, the cutting angle of the blade used for peeling, the peeling speed and any subsequent temperature treatments.
  • the self-adhesive composition is applied according to the preferred embodiment just on the side of the curl tendency film, which is the inner side when unrolled rolling.
  • this page selection which is illustrated in FIG. 3, complicates the application of the self-adhesive composition, it could be achieved by selecting suitable web tension and web paths in front of the coating unit.
  • Figure 5 shows the two same parts 1 and 2 as Figure 4, but during the slipping over the Blendenfalzes 21 on the body Jacobfalz 31 approximately halfway through the Einstockedweges.
  • the end portion 14 of the flag 13 slides during insertion on the free end 22 of the Blendenfalzes 21.
  • the thereby to be overcome slight sliding resistance between the flag end 14 and the end 22 of the fold 21 - wherein said sliding resistance is formed by a contact pressure, which in turn by the forcing of the carrier 1 1 in a curvature inversely to the inherent transverse curvature arises - causes a tightening of the Gleitbandes during the insertion operation, thus avoiding the emergence of wrinkles that would counteract the desired noise-reducing effect. All this is achieved without the end mechanic in the automotive plant would require special precision engineering skill. Therefore, a particularly fast mountability is expected at a particularly low rate of complaints.
  • the contact pressure of the flag end 14 should be at least so high to the opposite surface of the panel 2 that even with the toughest vibration stress - usually idle speed of the cold engine - is still ensured in every phase of the vibration in that the flag rests without clearance on the intended mating surface, because otherwise rattling noises can occur.
  • the Einrolltendenz the carrier film 1 which was originally perceived only as somehow acceptable evil has deliberately been set quite large, which is achieved by producing a significantly larger inherent roll-in angle than the smallest possible one, namely as shown in the corresponding subclaims. This is particularly possible by choosing a smallest possible blade angle and a low temperature during peeling and a large film thickness.
  • the opening angle ⁇ of the curvature is greater than 20 °, more preferably the opening angle ⁇ of the curvature is between 70 ° and 720 °, more preferably 80 ° and 360 °, especially between 90 ° and 180 °.
  • the film carrier and / or the adhesive are preferably transparent.
  • a completely transparent product obtained in this way does not appear unaesthetic, even if it has not been glued to the right place, leaving areas uncovered. The same happens sometimes - due to application errors - in the area of the visible edge between rebate and Jacobfalz.
  • the surface of a sliding belt made from the extremely high-molecular-weight PE has not only more favorable friction coefficients than PTFE, but also a higher abrasion resistance, which keeps the creaking noise suppression functional over the years.
  • the adhesive tape equipped on one side with an adhesive is constructed as follows and has the specified technical values:
  • the acrylate self-adhesive is covered with release paper.
  • the measurements are carried out at a test climate of 23 ⁇ 1 ° C and 50 ⁇ 5% rel. Humidity carried out.
  • the tensile elongation behavior of the adhesive tape is tested on type 2 test specimens (rectangular, 150 mm long and, if possible, 15 mm wide test strips) according to DIN EN ISO 527-3 / 3/300 with a test speed of 300 mm / min, a clamping length of 100 mm and a pre-load of 0.3 N / cm, with patterns being cut to determine the data with sharp blades.
  • the tensile elongation behavior is tested in the machine direction (MD, direction of travel) unless otherwise specified.
  • the force is expressed in N / stripe width and the elongation at break in%.
  • the test results, in particular the elongation at break (elongation at break), must be statistically verified by a sufficient number of measurements.
  • Adhesive forces are determined at a deduction angle of 180 ° according to AFERA 4001 on (if possible) 15 mm wide test strips.
  • steel plates according to the AFERA standard are used as the test substrate, as far as no other primer is mentioned.
  • the thickness of the film of the adhesive tape is determined according to DIN 53370 (the pressure-sensitive adhesive layer is not taken into account).
  • a rectangular test piece with the edge dimensions 20 ⁇ 150 mm is cut from a carrier web so that the 20 mm are transverse to the machine direction of the film. This specimen is then stored for one hour at 50 ° C in a drying oven. Thereafter, the strip is allowed to condition for two hours at room temperature. The opening angle can then be read off with a commercially available protractor.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Adhesive Tapes (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

L'invention concerne un ruban adhésif permanent simple face comportant une pellicule comme support dont l'épaisseur est sensiblement constante dans le sens longitudinal et transversal, une couche adhésive permanente étant appliquée dans le sens longitudinal du ruban, et le ruban ayant une largeur inférieure au support. L'invention est caractérisée en ce que la pellicule utilisée comme support présente, relativement à son élément de friction associé, notamment le cadre d'une portière de véhicule à surface finie, une différence particulièrement faible entre le carré du coefficient d'adhérence et le carré du coefficient de frottement de glissement, à savoir inférieure à 0,010 et de préférence inférieure à 0,005.
PCT/EP2011/057932 2010-06-14 2011-05-17 Ruban adhésif simple face avec pellicule support WO2011157504A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010030020.9 2010-06-14
DE102010030020A DE102010030020A1 (de) 2010-06-14 2010-06-14 Zumindest einseitig klebriges Band mit Folienträger

Publications (1)

Publication Number Publication Date
WO2011157504A1 true WO2011157504A1 (fr) 2011-12-22

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2011/057932 WO2011157504A1 (fr) 2010-06-14 2011-05-17 Ruban adhésif simple face avec pellicule support

Country Status (2)

Country Link
DE (1) DE102010030020A1 (fr)
WO (1) WO2011157504A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015217913A1 (de) * 2015-09-18 2017-03-23 Tesa Se Verwendung eines einseitig klebend ausgerüsteten Klebebands

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230341A1 (de) 1981-08-31 1983-04-07 Clopay Corp. ( n.d. Ges.d. Staates Maryland ), 45202 Cincinnati, Ohio Kunststoff-folie mit matter, glanzloser oberflaeche
US5315788A (en) * 1993-06-16 1994-05-31 General Motors Corporation Low friction tape for movable vehicle glass
DE10309447A1 (de) 2003-03-05 2004-09-16 Tesa Ag Verfahren zur Herstellung eines streifenförmigen Auftrags eines Substrats, insbesondere einer Klebemasse, auf einem Trägermaterial
DE202006016394U1 (de) * 2006-10-26 2008-02-21 K.M.B. Klebetechnik Gmbh Kantenschutzband zum Schutz der Ränder von Mehrfachglasscheiben, insbesondere Brandschutzscheiben, mit Gleitfolie
WO2010046292A1 (fr) 2008-10-21 2010-04-29 Tesa Se Utilisation, en tant que ruban adhésif amovible, d'un ruban adhésif portant un revêtement adhésif sur au moins une face, avec un support de feuille
WO2011107359A2 (fr) * 2010-03-03 2011-09-09 Tesa Se Utilisation d'un ruban adhésif collant sur au moins une face

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3230341A1 (de) 1981-08-31 1983-04-07 Clopay Corp. ( n.d. Ges.d. Staates Maryland ), 45202 Cincinnati, Ohio Kunststoff-folie mit matter, glanzloser oberflaeche
US5315788A (en) * 1993-06-16 1994-05-31 General Motors Corporation Low friction tape for movable vehicle glass
DE10309447A1 (de) 2003-03-05 2004-09-16 Tesa Ag Verfahren zur Herstellung eines streifenförmigen Auftrags eines Substrats, insbesondere einer Klebemasse, auf einem Trägermaterial
DE202006016394U1 (de) * 2006-10-26 2008-02-21 K.M.B. Klebetechnik Gmbh Kantenschutzband zum Schutz der Ränder von Mehrfachglasscheiben, insbesondere Brandschutzscheiben, mit Gleitfolie
WO2010046292A1 (fr) 2008-10-21 2010-04-29 Tesa Se Utilisation, en tant que ruban adhésif amovible, d'un ruban adhésif portant un revêtement adhésif sur au moins une face, avec un support de feuille
WO2011107359A2 (fr) * 2010-03-03 2011-09-09 Tesa Se Utilisation d'un ruban adhésif collant sur au moins une face

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
ANONYMUS: "Produkt-Information 3M 5421, 5423, 5425 UHMW-Polyethylen-Gleitklebebände", INTERNET CITATION, 1 April 1998 (1998-04-01), pages 1 - 3, XP002570423, Retrieved from the Internet <URL:http://www.3meshop.de/downloads/5421x.pdf> [retrieved on 20100225] *
KARL PETER KUNSTSTOFFE GMBH: "PE - Polyethylen - nach DIN 16776", pages 1 - 1, XP002660657, Retrieved from the Internet <URL:http://www.peter-kunststoffe.de/material/polyethylen.html> [retrieved on 20111006] *

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