HU221277B1 - Multi-layer plastic sheet or plate with a transparent coating - Google Patents

Abstract

The subject of the invention is a multi-layered plastic floor covering sheet or sheet consisting of a single covering layer and at least one additional layer, in which at least one layer contains at least one ethylene/alkyl acrylate copolymer. The invention also applies to the production process. ŕ

Description

This invention relates to multilayer flooring plastic sheets or panels (hereinafter referred to as "plastic sheets") with a transparent topcoat, and to a process for their preparation and their use.

Multilayer plastic sheets or sheets, in the context of the present invention, are defined as planar shapes which consist of several layers superimposed on one another.

Poly (vinyl chloride) (PVC) -based multilayer plastic sheets have been used as floor coatings for decades as a use layer with a translucent topcoat. For example, the structure of such multilayer plastic sheets is as follows:

- translucent topcoat (colorless) (thickness 0.2-0.8 mm)

- interlayer, optionally colored and / or patterned (thickness 0,2-0,4 mm)

- bottom layer of any color (thickness 1.0-2.5 mm)

- optionally, a noise barrier layer, for example, of foamed plastic, cork or cork-containing material (thickness 1.5-2.0 mm).

Optionally, the cover layer (colorless layer) may be provided with a monochrome or multicolored back printing and / or the interlayer may be multicolored to produce a pattern. This can be done in a cost-effective sub-process.

In addition to these multilayer (heterogeneous) plastic sheets, there are known so-called homogeneous plastic sheets, i.e., single-layered plastic sheets in which each component is mixed to exhibit identical (homogeneous) properties across the plastic sheet from the top to the bottom.

For homogeneous plastic sheets, the pattern is achieved using granules of various colors. Conventionally, granules containing polymeric binder, pigment (s), filler and optionally excipients are processed into plastic sheets or sheets in compacting units such as calenders, double belt presses or static presses. However, due to the method of production, only a more or less longitudinal color pattern can be obtained for homogeneous plastic sheets, thus limiting the selection of the pattern. Furthermore, it is extremely costly to modify existing production equipment to produce homogeneous plastic sheets of various designs, as far as possible in the production of homogeneous plastic sheets. However, such pattern and color changes are needed to respond to the changing needs of the market.

In contrast to transverse longitudinal pattern homogeneous plastic sheets, translucent topsheet multilayer (heterogeneous) plastic sheets have the advantage that they are completely free to choose color and pattern when producing the pattern in many ways by printing the translucent topsheet and / or by printing on the top interlayer.

A further advantage over homogeneous plastic sheets in multilayer plastic sheets is that only the topsheet and the top intermediate layer need to be color fast to obtain plastic sheets with the same colors. Each of the layers below them may be of any color, alternating in color, so that it is possible to incorporate into this lower layer waste from the manufacture of plastic sheets or recycled materials.

As mentioned in the introduction, there have long been commercial PVC floorings with a translucent top coat as a cover. In recent years, however, the placement of PVC or PVC-containing plastics has become increasingly problematic, as the chlorine content of PVC poses a potential hazard when deposited and, when incinerated, releases hydrochloric acid, which corrodes incinerators and is detrimental to health.

In addition, PVC-based floor coverings always contain plasticizer. This plasticizer content has the additional disadvantage that the plasticizer can migrate to the adhesive used to glue the floor covering, thereby reducing the adhesive strength. The plasticizer may also become sweaty, making the floor covering a hard-to-clean dirt trap and forming a plastic duct system for migrating dyes, resulting in discoloration that is no longer removable. In addition, volatile plasticizers are a further problem for the environment.

For the reasons mentioned above, eco-friendly plastics have been sought to replace PVC, which can be used to produce products such as multilayer floor coverings which have similar properties to those produced on PVC but do not exhibit their disadvantages. In particular, olefin polymer-based plastics, such as polyethylene (PE), polypropylene (PP), ethylene-propylene copolymers, and copolymers of ethylene with other olefinic unsaturated compounds are considered.

For example, European Patent 321760 proposes the use of ethylene-vinyl acetate (EVA) copolymer as a polymeric binder for the production of homogeneous PVC-free plastic sheets.

According to German Patent Specification No. 14114085, a PVC-free floor covering is proposed, in which homogeneous plastic sheets are produced which preferably contain an EVA copolymer together with a polyolefin as a binder. These discs can be duplicated or tripled.

It is also proposed (German Patent No. 14127107) a multilayer PVC-free floor covering in which an EVA-based floor covering is doubled or triple-coated with a low density and / or very low density linear ethylene copolymer.

European Patent 213441 discloses a foil or foil sheet for furniture comprising at least two layers, namely a poly

EN 221 277 Β1 olefin film and a surface layer over the polyolefin film. The polyolefin film may have contained up to 30 parts by weight of ethylene acrylic ester acrylic acid polymer.

Also disclosed (EP 353068) is a coating film consisting of a base coat and a support layer. The carrier layer consisted of a resin composition containing 10 to 95% by weight of an ethylene copolymer. The latter may have been ethylene methacrylate copolymer, ethylene ethyl acrylate copolymer, ethylene butyl acrylate copolymer or ethylene 2-ethylhexyl acrylate copolymer. The substrate could be vaporized with metal. The coating film (on which the metal is separated) has a wide range of applications, for example as a packaging material.

The advantage of EVA copolymers is that they are relatively inexpensive and so diverse in use that they can be used in virtually every layer of a multilayer plastic sheet. Thus, a multilayer plastic sheet can be constructed of layers of preferably homogeneous polymer composition. This is the wind strips, departure debris, etc. of each layer. because of its significant in-house reuse.

On the other hand, however, EVA copolymers have significant disadvantages.

According to the List of Occupational Exposure Limits ("Das neue Chemikaliengesetz, Handbuch Dairy Gefáhrlichen Stoffe", Eberhard Quellmalz, Weka-Verlag, February 1992 - New Chemicals Act, Manual of Hazardous Substances), vinyl acetate is in Group IIIB carcinogens listed. Thus, significant problems and risks may arise in the manufacture of EVA-containing plastic sheets or sheets or in their use as floor coverings, especially with regard to ever-increasing safety requirements.

The residual monomer content of vinyl acetate is in the range of 0.1 to 0.5% by weight of commercially available EVA polymers. This vinyl acetate content cannot be further reduced by a subsequent treatment such as a stripping process. This can create significant loads in poorly ventilated areas by the slow and continuous release of vinyl acetate from commercially available floor coverings containing EVA polymers.

EVA shows relatively low thermal stability, i.e. EVA tends to decompose acetic acid at higher temperatures. The detectable acetic acid cleavage begins at about 180 ° C for EVA. This causes problems when other polymers, such as high melting point isotactic polypropylenes, need to be added to improve the mechanical properties (abrasion resistance, hardness). At the higher processing temperatures required, acetic acid depletion is already underway. This acetic acid cleavage adversely affects the properties of EVA and thus the properties of EVA-containing floor coverings, as double bonds are formed in the polymer chains, which are oxidatively attacked and lead to polymer degradation.

Low-density ethylene copolymers (density range about 0.915-0.935 g / cm ³ ), such as copolymers of ethylene and butene or octene (I), are particularly suitable as alternatives to EVA copolymers. These low-density ethylene copolymers, like EVA copolymers, have the advantage of being highly charged with conventional fillers and having controllable flexibility and hardness. However, such low density ethylene copolymers exhibit distinct olefinic properties: for example, they are highly non-polar. These olefinic properties adversely affect, inter alia, a multilayer plastic sheet containing such ethylene copolymers. Furthermore, it is problematic to provide such plastic sheets with surface finishes or varnishes as usual for floor coverings in order to improve their dirt behavior and abrasion properties because the adhesion between the plastic sheet and the finish or varnish is not sufficient.

It is therefore an object of the present invention to provide multilayer flooring panels or sheets which are PVC and EVA free and do not contain plasticizer. Furthermore, these plastic sheets should have the advantageous properties of known multilayer plastic sheets or sheets without showing the aforementioned disadvantages.

It is a further object of the present invention to provide a process for producing this multilayer flooring plastic sheet or sheet.

These tasks are accomplished by the use of plastic flooring boards and sheets as defined in the claims and by a process for their production.

The plastic flooring sheet or sheet of the present invention comprises a topsheet and at least one additional layer, wherein at least one of the layers comprises an ethylene / alkyl acrylate copolymer. The topsheet is preferably translucent and comprises an ethylene / alkyl acrylate copolymer.

Surprisingly, it has been found that the plastic flooring sheets or sheets of the present invention exhibit excellent flexibility and wear resistance, although they are free of PVC and EVA and contain no plasticizer. A further advantage is that higher temperatures, above about 180 ° C, can be used in their processing without damaging the polymer properties. This is advantageous because it can be used to add high melting point polymers (such as isotactic polypropylene types) to improve the mechanical properties (e.g., abrasion resistance) of the plastic sheets without breaking down acetic acid as with EVA copolymers.

A further advantage of the multilayer flooring panels of the present invention is their relatively low water uptake. This has a positive effect on the stability of the size and thus on the properties of use; Higher water uptake leads to swelling of the plastic sheets which can cause blisters and cracks in the bonding joints. They adversely affect the adhesive strength and are easily contaminated.

HU 221 277 Β1

Finally, it has surprisingly been found that the multilayer flooring plastic sheets of the present invention are excellent in the care of polymer-rich dispersions such as the floor care materials. This means that the care products adhere very well to the plastic sheets in a desired layer thickness and protect the floor covering for a sufficient period of time. This may conveniently be due to the increased polarity of the plastic surfaces of the sheets or sheets due to the presence of polar groups of the ethylene / alkyl acrylate copolymers used in the present invention.

The flooring plastic sheets of the present invention may also be provided with a conventional surface finish applied to the flooring by the manufacturer, which also exhibits excellent adhesion. Plastic floor coverings are often lacquered on their use side to improve performance. The flooring panels according to the invention are also well suited for this purpose. Such a varnish has excellent adhesion without the need for special pre-treatment of plastic sheets. A suitable lacquer for these purposes may be a conventional solvent-free two-component lacquer. The varnish is preferably a solvent-free varnish which can be cured by actinic radiation (e.g., UV light). However, if the topsheet comprises a small amount of ethylene / alkyl acrylate copolymer, it may be advantageous to subject the plastic sheet to a crown prior to surface finishing or varnish application.

Crown treatment of the backside of the topsheet and the top of the intermediate layer applied beneath the topsheet is also advantageous if a sample impression is to be provided on said surfaces of the topsheets.

The ethylene / alkyl acrylate copolymers used in the present invention may form part of each layer of the plastic flooring sheet or sheet. For the translucent topcoat, the content may range from about 5 to about 70% by weight of the topcoat, preferably from 10 to 50% by weight, and more preferably from 20 to 30% by weight. In addition to the translucent topcoat, the other layers have a polymeric binder content of from 20% to 80% by weight of at least one ethylene / alkyl acrylate copolymer based on the weight of the polymeric binder, preferably from 40% to 70% and particularly preferably from 60% to 70%.

The alkyl acrylate content in the ethylene / alkyl acrylate copolymer is then about 4 to 30% by weight, preferably 10 to 15% by weight. The acrylic acrylate content depends on the desired properties of the layer. The higher the acrylate content in the ethylene / alkyl acrylate copolymer, the softer and more flexible the copolymer will be.

In addition to the translucent topsheet, the other layers of the floor covering plastic sheets and panels of the present invention comprise from 20 to 60% by weight, preferably from 30 to 50% by weight, particularly preferably from 35 to 45% by weight of polymer binder.

Preferably, the alkyl acrylate used in the ethylene / alkyl acrylate copolymer in the floor covering plastic sheets and sheets of the present invention is a methyl acrylate, ethyl acrylate, butyl acrylate or any mixture thereof. It is particularly advantageous to use ethyl acrylate because it smells less intense than, for example, butyl acrylate. The ethylene / alkyl acrylate copolymer is a copolymer obtained by copolymerization of ethylene with an alkyl acrylate. Methyl acrylate, ethyl acrylate, butyl acrylate or any mixture thereof may be used as alkyl acrylates. These copolymers may be prepared in a known manner, preferably by high pressure polymerization from a gas phase.

The ethylene-alkyl acrylate copolymers used in the present invention can be both statistical copolymers and block copolymers, preferably statistical copolymers.

As mentioned above, the presence of at least one ethylene / alkyl acrylate copolymer in the flooring plastic sheets of the present invention provides excellent compatibility and adhesion with polymer-rich dispersions (such as those contained in floor care materials) and surface finishes or varnishes. There is also a clear improvement in abrasion and abrasion resistance. The presence of one or more ethylene / alkyl acrylate copolymers in the topsheet does not significantly reduce the transparency of this layer. This way, any pattern can be printed without any problems on the underside of the topsheet or on the top side of the underlying intermediate layer, and this pattern can be detected by the viewer without any distortion. This is one of the great advantages of translucent topsheet multilayer plastic sheets over homogeneous plastic sheets.

In addition to ethylene / alkyl acrylate copolymers, additional polymers were used in the topsheet to further improve the performance properties of the plastic sheets.

Crystalline isotactic polypropylene types or polypropylene copolymers can be added to control the hardness properties. In order to optimize the properties of the topsheet (such as hardness, indentation hardness, abrasion resistance, resistance to dirt, etc.), the polymer or blend of the topsheet can be modified with additives. Examples include ethylene and propylene homo- and copolymers, ethylene and propylene random copolymers, ethylene-propylene rubbers (EPM), ethylene-propylene-diene terpolymers (EPDM), styrene-isoprene-styrene (SIS) and / or styrene-butadiene-styrene. (SBS) block polymers and copolymers of ethylene with at least one additional alkene having up to 10 carbon atoms, such as octene. A high-density or ultra-high-density polyethylene (PE-HMV or PE-UHMW) is preferably added to enhance toughness.

Optionally, conventional excipients such as antioxidants, antistatic agents, lubricants and processing aids may be added to the topsheet. In particular, antioxidants and antistatic agents are strongly recommended to protect plastic sheets from oxidative degradation and to prevent

The static charges, which are uncomfortable with the production of plastic sheets and negatively affect the dirt behavior of the plastic sheets in later use, are eliminated.

In addition, I can add pigments and colorants to the topcoat to create a basic structure or base color before printing.

The backing of the topsheet and the surface of the underlying layer can be printed conventionally, for example by semi-autotyping, engraved rollers. It is advantageous to pre-treat the surfaces by crowning.

Other polymers which may be used in the transparent topcoat, as well as homo- and copolymers of ethylenically unsaturated compounds, or any mixture thereof, are suitable for use as a polymer for the other layers of the multilayer flooring panels according to the invention.

These additional layers (interlayer, lower layers) may still contain conventional fillers such as chalk, kaolin, talc, wood flour, quartz flour, dolomite, diatomaceous earth, gravestone and shale flour, or any mixture thereof, with the proportion of fillers in each 80% by weight, preferably 50-70% by weight and particularly preferably 60-65% by weight.

Otherwise, additional coatings (such as pigments and dyes) for the topcoat may be added to the additional layers. By not being bound in color to the interlayer and to any additional layers that may be present (the lower layer), reusable material can be added to these layers, especially the lower layers. This can be waste from current production, so-called new mass waste, such as disc debris or start-up waste, or material recovered from the recycling of plastic waste. The amount of recycled material added is based on the nature of the material and only such amount of recycled material should be added as to meet the requirements for the material of the plastic sheet.

Optionally, the multilayer flooring panels of the present invention may be provided with a layer of non-woven or interlining, for example, inserted between the intermediate layer and the next lower layer to provide even greater strength and dimensional stability to the plastic sheet.

The multilayer flooring panels of the present invention may be provided on their underside with a heat-insulating and / or noise-insulating layer, which may be, for example, foamed plastic, a sufficient thickness of non-woven, textile, cork or cork products.

The multilayer flooring panels or panels of the present invention are produced by individually forming each layer (film) and subsequently welding it in a known manner.

The polymer binder and optional excipients, fillers, recycled material, etc., are used to make each film. premixed and plasticized in machine units such as an internal mixer, two-axis extruder, planetary-cylinder extruder or roller. The plasticized material is then processed with suitable machines, such as calenders or double belt presses, optionally with a fleece or tissue insert, to a desired thickness. You can then print or print the appropriate layers on the back. The individual films are then joined by welding, for example, by means of an Auma or a cold zone dual belt press, the latter being preferred in order to reduce machine adhesion problems. Simultaneously or thereafter, if desired, a thermal and / or noise barrier layer may be applied to the underside of the plastic sheet in a conventional manner.

The multilayer flooring panels of the present invention were subjected to the following tests, among others:

1. Ball rolling resistance by ball rolling test (test specification for elastic coatings according to DLW Rt. Internal working standard):

This test (with reference to German Standards DIN 16 952 T 1-5, DIN 16 851, DIN 18 173) is used to determine the behavior of multilayer coatings in wheelchair and sliding movements similar to those of a wheelchair. The test is carried out using the "Stuttgart" abrasion tester according to German standard 51 513, which has been modified so that the load mass is 34 kg, the ball has a diameter of 20 mm, it has a cooling air blower and a pendulum segment without pendulum motion. A specimen (190x190 mm), of a thickness of the respective plastic sheet or sheet obtained, is glued to the aluminum sheet using a double-sided adhesive tape. Before the test, the test piece shall be stored in an air-conditioning stand for at least 24 hours in a normal climate (German standard DIN 50 014-23 / 50-2). At the end of the test, the specimen is held on the turntable of the propulsion machine and the counter set to 1000 double pulley strokes. Execution is carried out with cooling (cooling fan). The number of double mangrove strokes to bladder formation is used as a yardstick for evaluation. The minimum requirement for wheelchair quality shall be at least 1000 double strokes up to the bladder.

2. Compression behavior according to German standard DIN 51 955.

3. Embossing behavior with short-term "seal printing test" (test specification for flexible coatings according to DLW AG internal working standard):

Based on DIN 51 955, this test is used to quickly determine coating recovery and hardness. The tester used is a thickness gauge (flat surface for cylindrical stamps: 6 mm, measuring pressure 0.03 N / mm ² ) and an indentation tester (circular base of the stamp: 11.3 mm) according to DIN 51 955, 4.1 and 4.2. Three test pieces (100x50 mm) are distributed along the track width, with the edges spaced at least 50 mm. Before the test:

GB 221 277 Β1 test specimens are stored for at least 48 hours in a standard climate according to DIN 50 014-23 / 50-2. The test is carried out in the following steps:

- thickness measurement and indication of measuring site,

- centrally positioning the specimen on the press, zeroing the dial by rotating the spindle, preloading force 3N,

- non-shock load in 5 seconds, total load 1 kN,

- reading of indentation depth after 1 minute and removal of test load,

- the test piece remains in the apparatus and after a further minute read off the residual impression under preload.

The resilience (elasticity) and hardness index (index) are determined by the following formulas:

Example

A) Making a translucent topcoat (transparent layer) Impression - Permanent Impression (1 minute) (1 minute)

- Reset: -χ 100 o / _o Impression (1 minute) Impression (1 minute)

- hardness: -χ 100 index (HE) thickness mm

4. Loss of thickness after 20 cycles according to DIN 51 963, 10 met.

5. Dimensional and dimensional stability according to German standard 51 512.

6. Layer separation test according to German standard 53 537.

7. Burning test according to German standard DIN 4102.

Unless otherwise specified, all quantitative data are by weight and all temperature data are in ° C.

The following example is intended to further illustrate the invention.

25.0 Lotryl ^R 24 MA 005 (Ethylene / methyl acrylate copolymer) Elf Ato-Chemie 45.0 Dowlex ^R 2045 E0 (Ethylene / octene copolymer) DOW 10.0 Vestolen ^R P 5300 (PE-PP Random Copolymer) Hüls AG 18.6 Vistalon R _8O8 E (Ethylene propylene rubber) EXXON 0.2 Irganox ^R 1010 (Antioxidant) Ciba-Geigy 0.2 Barolub ^R FTA (stearic acid, lubricant) Bárlocher 1.0 Tebestrat ^R BK (Antistatikum) Böhme

100.0

All of the above components are mixed in a vortex mixer (Henschel) and plasticized with a GK5 kneading machine from Wemer & Pfleidere for about 5 minutes. (The mass temperature is 190-200 ° C). The plasticized mass is added to a roller chair at 185 ° C and further homogenized. The mass is then pulled into a 0.4 mm film on a 4-cylinder calender (Berstorff Company).

Cylinder cylinder Temperatures Speed m / min 1: 160 ° C 7 2: 160 ° C 8.5 3: 160 ° C 9.5 4: 160 ° C 8.0

In this way, a film-like product is obtained which is transparent enough to allow the print image to be clearly recognized, if necessary, after printing on the back side.

B) Preparation of an intermediate layer

24.7 Dowlex ^R 2045E (Ethylene-octene copolymer) DOW 10.0 Lotryl ^R 24 MA 005 (Ethylene-methyl acrylate copolymer) Elf Ato-Chemie 20.0 Sillitin ^R N85 (Quartz / kaolinite) Hoffmann Mineral 40.0 Omycarb ^R 6 (chalk) OMIA 5.0 Pigments (such as titanium dioxide) e.g. Kronos 0.2 Irganox ^R 1010 (Antioxidant) Ciba-Geigy 0.1 Barolub ^R FTA (Stearic acid) Bárlocher

100.0

All of the above components are mixed in a vortex mixer (Henschel) and plasticized with a GK5 kneading machine from Wemer & Pfleiderer for about 5 minutes. (The mass temperature is about 180 ° C.) The mass is applied directly from the Schwabenthan rolling mill (140 ° C cylinder temperature) to a 3-cylinder calender (Berstorff) and directly laminated to Schuller's SH 50 glass-fleece fabric (film thickness 0.3) mm).

HU 221 277 Β1

Cylinder cylinder Temperature Speed m / min 1: 130 ° C 8 2: 130 ° C 8.7 3: 130 ° C 9.5

In this way, a foil with reinforcing fleece insert is obtained.

C) Preparation of the lower layer

1. Applying a "new mass"

The following composition was prepared as described above:

4.7 Vestolen ^R 5300 (PE-PP random copolymer) Huls 20.0 Dowlex ^R 2045E (Ethylene-octene copolymer) DOW 10.0 Lotryl ^R 24 MA 005 (Ethylene-methyl acrylate copolymer) Elf Ato-Chemie 10.0 Sillitin ^R N85 (Quartz / kaolinite) Hoffmann Mineral 50.0 Omycarb ^R 6 (chalk) OMIA 5.0 Pigments (such as titanium dioxide) e.g. Kronos 0.2 Irganox ^R 1076 (Antioxidant) Ciba-Geigy 0.1 Barolub ^R FTA (Stearic acid) Bárlocher

100.0

2. Use of recycled material

Instead of the "new mass" material indicated above, ground edge strips of the same coating composition and proportion may be used. Up to 50% of the total amount of layer can be recycled.

The components are mixed in a vortex mixer (Henschel) and plasticized with a GK5 kneading machine from Wemer & Pfleiderer for about 4 minutes. (The temperature of the mass is 180-190 ° C.)

The mass is applied directly from a roller chair at 150 ° C (Schwabenthan company) to a 4-cylinder calender (Berstorff company) and a 0.5 mm film 35 is formed.

Cylinder cylinder Temperature Speed m / min 1: 140 ° C 10 2: 140 ° C 11.5 40 3: 140 ° C 12.5 4: 140 ° C 11.5

D) Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Layer Intermediate Laminated Intermediate Layer Intermediate Layer Intermediate Laminated Intermediate Layer Intermediate Laminated Intermediate Layer Intermediate Laminated Intermediate Layer The binder is selected according to the base. On a printing basis, a crown is made before the printing process. (Speed is about 40 m / min.)

Drying temperatures:

Channel 1 40 ° C Channel 2 40 ° C Channel 3 40 ° C végcsatoma 60 ° C Printer ink dry film thickness-

15-20 g / m ² for full-surface printing per roller.

E) Joining individual layers

Each film was welded to the following complete assembly:

Top coat (translucent) 0.4 mm

Intermediate layer with carrier cloth, print 0.3 mm

Lower layer, triple, 0.5 mm each

2.2 mm ± 0.1 mm

To do this, each individual layer (foil) is fed to a rubber band machine on a Reyon co-op machine (Mehler) and welded together at 100 ° C drum temperature to form a complete combination. The lower layer and the intermediate layer are first heated to 180 ° C with an infrared radiator. The belt speed is 2 m / min and the belt pressure is 200 bar or 4 bar partial pressure. Then, in the same session, a reverse roller applicator is coated with 100% UV-cured lacquer coating (type LM 720, Bielefeld fired) at a rate of application of 15-20 g / m ² . The varnish is cured in a single-pass UV channel equipped with 4 UV radiators, each with a power of 120 W / cm and adjustable between 50-100%. The first radiator is height adjustable to control the brightness.

The multi-layer plastic sheet obtained in this way exhibits the following properties which are of decisive importance for floor coverings:

Thickness:

2.25 +/- 0.1 mm

Stalling resistance according to ball rolling test (DLW Rt. Internal working standard):

> 5000 double strokes to bladder formation

Injection behavior according to German standard 51 515:

Initial thickness: 2.29 mm

Impression (150 min): 0.48 mm

HU 221 277 Bl

Residual indentation: 0.11 mm

Recovery (150 minutes): 77.1%

Index: 21.0

Embossing behavior with short-term stamp test (DLW AG internal operating standard):

Initial thickness: 2.29 mm

Impression (1 minute): 0.45 mm

Residual Impression (1 minute): 0.12 mm Flexibility 73.3%

Index: 19.7

Thickness according to German standard 51 513:

0.07 mm after the cycle

Dimensional and dimensional stability according to German standard 51 512:

In length: -0.17 mm

Crosswise: +0.14 mm

The response is not measurable.

Layer separation test according to German standard 53 537.

Separation at use layer, peel resistance:

Length: 38.6 N / 5 cm

Crosswise: 37.2 N / 5 cm

Burning test according to German standard DIN 4102:

B2

Claims (21)

PATIENT INDIVIDUAL POINTS A multilayer floor covering plastic sheet or sheet of a topsheet and at least one further layer, comprising at least one layer of at least one ethylene alkyl acrylate copolymer. Multilayer floor covering plastic sheet or sheet according to claim 1, characterized in that the topsheet is translucent. Multilayer floor covering plastic sheet or sheet according to claim 1 or 2, characterized in that the topsheet comprises at least one ethylene / alkyl acrylate copolymer. 4. A multi-layered flooring plastic sheet or sheet according to claims 1-3. Claim according to any one of claims 1 to 3, characterized in that the ethylene-alkyl acrylate copolymer comprises from 4 to 30% by weight of alkyl acrylate. 5. A multi-layered flooring plastic sheet or sheet according to any one of claims 1-4. A composition according to any one of claims 1 to 3, wherein the topsheet comprises from 5 to 70% by weight of at least one ethylene-alkyl acrylate copolymer. 6. A multi-layered flooring plastic sheet or sheet according to claims 1-5. The process according to any one of claims 1 to 4, wherein the alkyl acrylate comprises a methyl acrylate, ethyl acrylate, butyl acrylate or any mixture thereof. A multi-layered flooring sheet or sheet according to claim 6, wherein the alkyl acrylate is ethyl acrylate. 8. A multi-layered flooring plastic sheet or sheet according to claims 1-7. Claim according to any one of claims 1 to 3, characterized in that the ethylene / alkyl acrylate copolymer is a statistical copolymer or block copolymer. The multilayer flooring plastic sheet or sheet according to claim 8, wherein the ethylene / alkyl acrylate copolymer is a statistical copolymer. 10. Multilayer flooring plastic sheet or sheet 1 -9. Claim according to any one of claims 1 to 3, characterized in that the topsheet comprises at least one additional polymer. A multi-layered flooring plastic sheet or sheet according to claim 10, characterized in that the further polymer is a homo- or copolymer ethylenically unsaturated compound or any mixture thereof. 12. Multilayer floor covering under plastic sheet or sheet. according to claim 1, characterized in that the further polymer is at least one polymer of homo- or copolymer, ethylene and / or propylene, isotactic polypropylene, copolymer of ethylene with at least one alkene of up to 10 carbon atoms, EPDM terpolymer, EPM rubber, SIS and / or SBS block polymer, PE-HMW and PE-UHMW. 13. A multi-layered flooring plastic sheet or sheet according to claims 1-12. Claims according to any one of the preceding claims, characterized in that the plastic sheet has a pattern applied to the back side of the translucent topsheet and / or printed on the underlying intermediate layer. 14. A multi-layered flooring plastic sheet or sheet according to any one of claims 1-13. Claims according to any one of the preceding claims, characterized in that the topsheet further comprises additional conventional excipients. A multilayer floor covering plastic sheet or sheet according to claim 14, wherein said excipient comprises at least one antistatic and / or an antioxidant. 16. Multilayer flooring plastic sheet or sheet according to claims 1-15. A coating according to any one of claims 1 to 3, characterized in that it has a conventional surface finish or lacquer on the upper side of the topsheet. 17. A multi-layered flooring sheet or sheet according to claim 16, characterized in that the top side of the topsheet is subjected to crowning prior to application of the surface finish or lacquer. 18. A multilayer flooring plastic sheet or sheet as set forth in claims 1-17. Claims according to any one of the preceding claims, characterized in that the at least one additional layer comprises a polymeric binder, conventional fillers and optionally auxiliary substances. 19. A multi-layered flooring plastic sheet or sheet according to claims 1-18. Claims according to any one of claims 1 to 4, characterized in that at least one additional layer comprises recycled material. EN 221 277 B1 20. A multi-layered flooring plastic sheet or sheet according to claims 1-19. Claims according to any one of the preceding claims, characterized in that a further heat and / or noise protection layer is provided on the underside of the plastic sheet. 21. Procedure of claims 1-20. A multi-layered floor covering sheet or sheet according to any one of claims 1 to 4, characterized in that the topsheet, the intermediate layer and optionally at least one additional layer (bottom layer) are prepared separately by pre-mixing and plasticizing the components of the layers and then applying the plastified mass. In this way, it is converted into a flat layer, optionally with at least the intermediate layer or one of the lower layers with a layer of fleece or reinforcement, and then optionally printed on the back side of the cover layer 5 and / or printed on the upper side of the intermediate layer below and the resulting layers otherwise printed. in a known manner, they are welded together and the welded combination is optionally exposed to a heat and / or noise protection layer on its lower side.