DE10002154A1 - Structurized amorphous thermoplastic film, used for interior and exterior purposes, e.g. cladding, advertising, display and lighting, contains soluble flame retardant - Google Patents

Abstract

Amorphous, flame-retardant film based on a crystallizable thermoplastic material (I), which is 30-1000 mu m thick, is structurized on at least one side and contains flame retardant(s) soluble in (I). An Independent claim is also included for the production of this film.

Description

The invention relates to an amorphous, structured, flame-retardant film a thermoplastic whose thickness is in the range of 30 µm to 1000 µm. The foil contains at least one flame retardant and is characterized by very good optical properties Properties as well as by at least one structured surface and one economical manufacture. The invention further relates to a method of manufacture this slide and its use.

Films made of crystallizable thermoplastics with a thickness between 30 µm and 1000 µm are well known.

These foils are not flame retardant and have no structured Surface, so that neither the foils nor the articles made from them Suitable for applications where an effective advertising appearance and fire protection or Flame retardancy are required.

DE-A 23 46 787 describes a flame-retardant phospholane-modified raw material described. In addition to the raw material, the use of the raw material must also be oriented Films and fibers claimed.

In the production of film with this claimed phospholane-modified raw material the following deficits emerged:

The raw material is very sensitive to hydrolysis and must be pre-dried very well. At the Drying the raw material with dryers that correspond to the prior art, glued  the raw material, so that a film can only be produced under the most difficult conditions. The films produced under extreme, uneconomical conditions become brittle Temperature loads, d. H. the mechanical properties go due to the normal embrittlement strongly so that the film is unusable. Already after 48 This embrittlement occurs for hours of thermal stress.

The object of the present invention is to overcome the disadvantages of the prior art avoid.

The task is solved by providing an amorphous, structured, flame retardant equipped film with a thickness in the range of 30 microns to 1000 microns, which as Main component contains a crystallizable thermoplastic and thereby is characterized in that it is provided with at least one structured surface and additionally contains at least one flame retardant that is soluble in the thermoplastic. The invention also relates to a method for producing the film and its Use.

The film can be produced economically, has a flame-retardant effect and is good optical properties - is therefore primarily effective in advertising - and shows no embrittlement after exposure to temperature.

The film according to the invention contains a crystallizable as the main component Thermoplastics. Suitable crystallizable or partially crystalline thermoplastics are for example polyethylene terephthalate (PET), polybutylene terephthalate, Polyethylene naphthalate or mixtures thereof, with polyethylene terephthalate being preferred is.

According to the invention, crystallizable thermoplastics are understood to be crystallizable  Homopolymers, crystallizable copolymers, crystallizable compounds (mixtures), crystallizable recyclate and other variations of crystallizable thermoplastics.

For the purposes of the present invention, amorphous films are such films understood that, although the crystallizable thermoplastic has a crystallinity between 30% and has 65%, are not crystalline. Not crystalline, i.e. H. essentially amorphous and means that the degree of crystallinity is generally below 5%, preferably below 2%, especially 0%. Such a film is essentially unoriented Condition before.

The film according to the invention contains at least one flame retardant, which over the so-called masterbatch technology is metered in directly during film production, whereby the concentration of the flame retardant in the range from 0.5 to 30.0% by weight, preferably from 1.0 to 20.0% by weight, based on the weight of the layer of crystallizable thermoplastics. During the production of the masterbatch, generally a flame retardant to thermoplastic ratio in the range of 60 to 40 wt .-% up to 10 to 90 wt .-% observed.

Typical flame retardants include bromine compounds, chlorinated paraffins and other chlorine compounds, antimony trioxide, aluminum trihydrates, the Halogen compounds due to the resulting halogen-containing by-products are disadvantageous. Furthermore, the low light resistance is one that is equipped with it In addition to the development of hydrogen halide, film is extremely disadvantageous in the event of a fire.

Suitable flame retardants which are used according to the invention are for example organic phosphorus compounds such as carboxyphosphinic acids Anhydrides and dimethyl methylphosphonate. It is essential to the invention that the organic Phosphorus compound is soluble in the thermoplastic, since otherwise the required optical  Properties are not met.

Since the flame retardants generally have a certain sensitivity to hydrolysis have, the additional use of a hydrolysis stabilizer may be useful.

As a hydrolysis stabilizer, phenolic stabilizers, alkali / Alkaline earth stearates and / or alkali / alkaline earth carbonates in amounts of 0.01 to 1.0% by weight used. Phenolic stabilizers are used in an amount of 0.05 to 0.6% by weight, in particular 0.15 to 0.3 wt .-% and with a molecular weight of more than 500 g / mol prefers. Pentaerythrityl tetrakis 3- (3,5-di-tertiary-butyl-4-hydroxyphenyl) propionate or 1,3,5-Trimethyl-2,4,6-tris (3,5-di-tertiary-butyl-4-hydroxybenzyl) benzene are special advantageous.

A flame retardant effect means that the film in a so-called Fire protection test the conditions according to DIN 4102 part 2 and especially the Conditions according to DIN 4102 Part 1 fulfilled and in building material class B2 and in particular B1 can be classified as flame retardant.

Furthermore, the film is said to pass the UL test 94 "Vertical Burning Test for Flammability of Plastic Material "so that it can be classified in class 94 VTM-0 means that the film is no longer 10 seconds after the Bunsen burner is removed burns, no glow is observed after 30 seconds and no dripping is detected.

Good optical properties include, for example, in the case of a transparent one High light transmission (<80%), high surface gloss (<100) unstructured surface, low haze (<20%) and a low yellowness index (YID <10).  

The economic production includes that the raw materials or Raw material components needed to manufacture the flame retardant film be dried with industrial dryers that meet the standard of technology can. It is essential that the raw materials do not stick together and are not thermally broken down become. These state of the art industrial dryers include Vacuum dryer, fluid bed dryer, fluid bed dryer, fixed bed dryer (Shaft dryer). These dryers operate at temperatures between 100 and 170 ° C, where the previously used flame retardant raw materials according to the state of the art Technology in general have to stick together and have to be mined so that no film production is possible.

The raw material goes through one in the most gently drying vacuum dryer Temperature range from approx. 30 ° C to 130 ° C at a reduced pressure of 50 mbar. After that is a so-called drying in a hopper at temperatures of 100-130 ° C and a residence time of 3 to 6 hours is required. Even here it sticks up to now raw material used extremely.

No embrittlement at short temperature loads means that the film after 100 Hours of annealing at 100 ° C in a forced air oven no embrittlement and none Shows a break when kinked.

So it was more than surprising that using masterbatch technology, one suitable predrying and / or pre-crystallization using a film according to the invention the required property profile economically and without gluing in the dryer can be produced and that the film does not become brittle after exposure to temperature and when Buckling does not break.

It was very surprising that with this excellent result and the required  Flame retardancy of the yellowness index of the film compared to a film in the film that is not equipped The measurement accuracy is not adversely affected.

There are also no outgassing, no nozzle deposits, no evaporation, whereby the film has an excellent appearance.

Such a film is also economically viable.

Furthermore, it is very surprising that the regenerate produced from the films can be used again without negatively affecting the yellowness index of the film.

In a preferred embodiment, the film contains film according to the invention as Main component is a crystallizable thermoplastic with 1 wt .-% to 20 wt .-% of Organic phosphorus compound dimethyl methylphosphonate soluble in thermoplastic as a flame retardant.

The standard viscosity SV (DCE) of the thermoplastic, measured in dichloroacetic acid after DIN 53728 is between 600 and 1000, preferably between 700 and 900.

The thermoplastic film according to the invention, the at least one flame retardant contains, can be both single-layer and multi-layer. You can also with various copolyesters or adhesion promoters.

In the multilayer embodiment, the amorphous film is at least one Core layer and at least one top layer, with a particular three-layer A-B-A or A-B-C structure is preferred.

For this embodiment it is essential that the thermoplastic of the core layer is a  Standard viscosity similar to that of the thermoplastic of the top layer (s) attached to the Core layer adjoins (adjoin).

In a special embodiment, the cover layers can also consist of one Polyethylene naphthalate homopolymers or from polyethylene terephthalate Polyethylene naphthalate copolymers or compound exist.

In this embodiment, the thermoplastics of the cover layers also have similar ones Standard viscosities like the thermoplastic of the core layer.

In the multilayer embodiment, the flame retardant is preferably in the or the top layers included. However, the core layer can also be used as required Flame retardants must be equipped.

In contrast to the single-layer embodiment, the concentration of the Flame retardant on the weight of the thermoplastics in the finished layer.

Fire protection tests according to DIN 4102 and the UL test are very surprising shown that in the case of a three-layer film it is quite sufficient that 0.5 to 10 µm thick top layers with flame retardants to improve To achieve flame retardancy. If necessary and with high fire protection requirements the core layer must also be equipped with flame retardants, d. H. a so-called Include basic equipment.

As a result, they are manufactured using the known coextrusion technology multilayer films according to the technology compared to the completely in high Concentrations of finished monofilms are economically interesting because they are significantly less Flame retardant is needed.  

The film can also be coated on at least one side with a scratch-resistant coating Copolyester or be provided with an adhesion promoter.

During the production of the film it was found that using masterbatch technology and a suitable predrying or pre-crystallization of the masterbatch the film can be produced without gluing in the dryer. Furthermore, there were no outgassings and deposits found in the production process.

In addition, measurements showed that the film according to the invention Temperature loads of 100 ° C do not become brittle over a longer period, which is more than surprising. This result is due to the synergistic effect of suitable pre-crystallization, predrying and masterbatch technology.

Furthermore, the film is without environmental pollution and without noticeable deterioration the optical and mechanical properties can be easily recycled, which makes them For example, for use as short-lived advertising signs, for trade fair construction and suitable for other promotional items where fire protection and advertising effectiveness is desired.

Surprisingly, films according to the invention in the thickness range 30- Building material classes B2 and B1 according to DIN 4102 and UL test 94 1000 µm.

The production of the film according to the invention can, for example, according to known Extrusion processes take place in an extrusion line.

The flame retardant is added using masterbatch technology. The Flame retardant is first fully dispersed in a carrier material. As Backing material comes from the thermoplastic itself, e.g. B. the polyethylene terephthalate or other polymers that are compatible with the thermoplastic are also possible. After  Dosing to the thermoplastic for film production melts the components of the masterbatch during the extrusion and are thus dissolved in the thermoplastic.

The effective structure of at least one surface is achieved by using a chrome-plated and textured take-off roller on which the melt film passes through Cooling below the glass temperature receives the desired structure. Suitable structures are, for example, three-dimensional, symmetrical structures, asymmetrical three-dimensional knobs, waves, tips and depressions, leather patterns and others, patterns known to those skilled in the art.

If the film is smoothed, i. H. is manufactured using calender technology of I, F and L calenders, the take-off roll is the structuring roll. Using S-calenders structure the counter-rotating roll adjacent to the take-off roll.

If both surfaces are to be structured, both the take-off roller and the downstream roller structured.

The take-off roller is a metallic roller, the exact cylindrical surface of which is about the entire width is provided with a completely uniform structure. On the Roll is the negative image of the structure desired in the film.

The diameter of the roller can vary within wide limits depending on the thickness of the film. The diameter is preferably between 0.5 m and 4 m, in particular between 1 m and 3 m.

The structuring not only has aesthetic advantages. Minor surface defects that can occur during the manufacturing process are covered. The surface of a grained or textured film is less sensitive to fingerprints or  Scratch.

It is important with the masterbatch technology that the grain size and the bulk weight of the masterbatch is similar to the grain size and bulk density of the thermoplastic, so that a homogeneous distribution and thus a homogeneous flame retardancy can be done.

The films can be made from a thermoplastic raw material using known methods optionally other raw materials and the flame retardant and / or others usual additives in the usual amount of 0.1 to max. 30.0% by weight both as a monofilm as well as multilayer, optionally coextruded films with the same or differently designed surfaces are produced, one surface for example, is pigmented and the other surface contains no pigment. As well can one or both surfaces of the film by known methods with a usual functional coating.

The film can also be inorganic in both the base and / or the top layers Color pigment, such as B. titanium dioxide, barium sulfate, inorganic black pigments and contain inorganic colored pigments. In this case, the film is no longer transparent, d. H. the haze is greater than 20% in the opaque colored embodiments.

Typical inorganic black pigments are soot modifications, which can also be coated can, carbon pigments that differ from the carbon black pigments by a higher Differentiate ash content, and oxidic black pigments such as iron oxide black and Copper, chromium, iron oxide mixtures (mixed phase pigments).

Suitable inorganic colored pigments are oxidic colored pigments, hydroxyl-containing ones Pigments, sulfidic pigments and chromates.  

Examples of colored oxide pigments are iron oxide red, titanium oxide-nickel oxide-antimony oxide. Mixed phase pigments, titanium dioxide-chromium oxide, antimony oxide mixed phase pigments, Mixtures of the oxides of iron, zinc and titanium, chromium oxide, iron oxide brown, spinels of Systems cobalt aluminum titanium nickel zinc oxide and mixed phase pigments based on other metal oxides.

Typical hydroxyl-containing pigments are, for example, oxide hydroxides of trivalent Iron, like FeOOH.

Examples of sulfidic pigments are cadmium sulfide selenides, cadmium zinc sulfides, Sodium aluminum silicate with sulfur in the lattice bound like polysulfide.

Examples of chromates are lead chromates, which in the crystal forms are monoclinic, rhombic and can be tetragonal.

Like the white and black pigments, all colored pigments can be both uncoated and are also inorganic and / or organically coated.

The organic colored pigments are usually divided into azo pigments and so-called Non-azo pigments.

The azo (-N = N -) group is characteristic of the azo pigments. Azo pigments can Monoazo pigments, diazo pigments, diazo condensation pigments, salts of Azo coloring acids and mixtures of the azo pigments.

It is essential to the invention that the masterbatch which contains the flame retardant is pre-crystallized or pre-dried. This predrying involves a gradual one Heating the masterbatch under reduced pressure (20 to 80 mbar, preferably 30  up to 60 mbar, in particular 40 to 50 mbar) and with stirring and optionally a After-drying at constant, elevated temperature also under reduced pressure. The Masterbatch is preferably from a dosing container in the room at room temperature desired mixture together with the polymers of the base and / or Cover layers and possibly other raw material components in batches in one Vacuum dryer, which has a temperature range of 10 ° C to 160 ° C, preferably 20 ° C to 150 ° C, especially 30 ° C to 130 ° C passes through, filled. During the approximately 6 hours, preferably 5 hours, especially The raw material mixture is at a 4-hour residence time at 10 to 70 rpm, preferably 15 up to 65 rpm, in particular 20 to 60 rpm. The pre-crystallized or pre-dried raw material mixture is also evacuated in a downstream Containers at 90 to 180 ° C, preferably 100 ° C to 170 ° C, especially 110 ° C to 160 ° C for 2 to 8 hours, preferably 3 to 7 hours, especially 4 to 6 hours post-dried.

The polymers or raw material mixtures are an extruder or multi-layer Films fed to several extruders. Any foreign objects or Contaminants can be filtered out of the polymer melt before extrusion. The Melt (s) are then in a mono nozzle or in a multi-layer case in one Multi-layer nozzle formed into flat melt films and in the multi-layer case layered on top of each other. Then the monofilm or multilayer film is included With the help of a structured take-off roller and, if necessary, additional rollers can also be structured, peeled off and solidified as an amorphous film. Subsequently the cooled, amorphous, structured film is hemmed and wound up.

The film can also be coated on at least one of its surfaces, so that the coating on the finished film has a thickness of 5 to 100 nm, preferably 20 up to 70 nm, in particular 30 to 50 nm. The coating is preferred in-line  upset, d. H. during the film manufacturing process, expediently after the Solidification. The application of the "reverse gravure-roll coating" is particularly preferred. Process in which the coatings are extremely homogeneous in the mentioned Have layer thicknesses applied. The coatings are preferred as a solution, Suspension or dispersion applied, in particular as an aqueous solution, Suspensions or dispersions. The coatings mentioned give the Foil surface an additional function. For example, the film sealable, printable, metallizable, sterilizable, antistatic or improve e.g. B. the Aroma barrier or allow liability for materials that are not otherwise on the Film surface would adhere (e.g. photographic emulsion). examples for Substances / compositions that give additional functionality:

Acrylates such as z. B. are described in WO 94/13 476, ethyl vinyl alcohols, PVDC, water glass (Na ₂ SiO ₄ ), hydrophilic polyesters (5-sodium sulfoisophthalic acid-containing PET / IPA polyesters as described, for example, in EP-A-0 144 878, US-A-4,252,885 or EP-A-0 296 620, vinyl acetates as described, for example, in WO 94/13 481, polyvinyl acetate, polyurethanes, alkali metal or alkaline earth metal salts of C ₁₀ -C ₁₈ fatty acid, Butadiene copolymers with acrylonitrile or methyl methacrylate, methacrylic acid, acrylic acid or their esters.

The substances / compositions mentioned are in the form of a dilute solution, emulsion or Dispersion preferably as an aqueous solution, emulsion or dispersion onto or both film surfaces applied and then the solvent evaporated. If the coatings are applied in-line, one is usually sufficient Heat treatment after solidification to volatilize the solvent and dry the coating. The dried coatings then have that desired layer thicknesses mentioned.  

Furthermore, the films can be coated, preferably in an off-line process, with metals such as aluminum or ceramic materials such as SiO _x or Al _x O _y . This improves their gas barrier properties in particular.

Due to the surprising combination of excellent properties, the Film according to the invention excellent for a variety of different applications, for example for interior cladding, for exhibition stand construction and exhibition items, as displays, for signs, for protective glazing of machines and vehicles, in Lighting sector, in shop and shelf construction, as promotional items, laminating medium, in Outdoor area for greenhouses, canopies, outer cladding, covers, Applications in the construction sector and illuminated advertising profiles, shadow mats and for Electrical applications.

The measurements of the individual are carried out in the following exemplary embodiments Properties according to the following standards or procedures.

Measurement methods Surface gloss

The surface gloss is measured at a measuring angle of 20 ° according to DIN 67530.

Light transmission

Under the light transmission is the ratio of the total transmitted light to the to understand the amount of incident light.

The light transmission is carried out with the measuring device "®HAZEGARD plus" according to ASTM D 1003 measured.  

Cloudiness

Haze is the percentage of the transmitted light, that of the incident light The light beam deviates by more than 2.5 ° on average. The image sharpness is at an angle determined less than 2.5 °.

The turbidity is determined using the "HAZEGARD plus" measuring instrument in accordance with ASTM D 1003.

Surface defects

The surface defects are determined visually.

SV (DCE), IV (DVE)

The standard viscosity SV (DCE) is based on DIN 53726 in dichloroacetic acid measured.

The intrinsic viscosity (IV) is calculated from the standard viscosity as follows

IV (DCE) = 6.67. 10 ^-4 SV (DCE) + 0.118

Fire behavior

The fire behavior is according to DIN 4102 part 2, building material class B2 and DIN 4102 part 1, building material class B1 and determined according to UL test 94.

Yellowness index

The yellowness index (YID) is the deviation from the colorlessness in the "yellow" direction and will measured according to DIN 6167. Yellowness indexes (YID) of <5 are not visually visible.

Examples example 1

A 300 µm thick, amorphous, one-sided structured, transparent film is produced, the main component is polyethylene terephthalate (standard viscosity SV (DCE) of 810,  corresponds to an intrinsic viscosity IV (DCE) of 0.658 dl / g), 0.1% by weight ®Sylobloc as Antiblocking agent and 4% by weight of the organic phosphorus compound soluble in PET Dimethyl methylphosphonate ®Amgard from Albright & Wilson as a flame retardant contains.

For the purpose of homogeneous distribution, the Sylobloc, which is not soluble in PET, is used in the Raw material manufacturers incorporated into the polyethylene terephthalate.

The flame retardant is added in the form of a masterbatch. The master batch consists of 20 wt .-% flame retardant and 80 wt .-% of the above Polyethylene terephthalate together.

The masterbatch has a bulk density of 750 kg / m ³ and a softening point of 69 ° C.

50% by weight of the polyethylene terephthalate, 30% by weight of a polyethylene terephthalate Recyclates (standard viscosity SV (DCE) of 770) and 20% by weight of the masterbatch are filled into a dryer from separate dosing containers at room temperature from the time of filling until the end of the dwell time under reduced pressure Temperature range from 25 ° C to 130 ° C. During the approximately 4 hours The raw material mixture is stirred at 61 rpm.

The pre-crystallized or pre-dried raw material mixture is in the downstream Hopper also under reduced pressure at 140 ° C for 4 hours post-dried. The raw material mixture is then fed to an extruder and any foreign bodies or contaminants from the melt before extrusion filtered off. The melt becomes a flat melt film in a single nozzle molded and drawn off with the help of a structured take-off roller and as amorphous  Film solidified.

The amorphous, one-sided structured, transparent PET film has the following property profile:
Thickness: 300 µm
Surface gloss 1st side (unstructured side, measuring angle 20 °): 155
Light transmission: 89%
Turbidity: 5.0%
Surface defects per m ² : none
Yellowness index (YID): 4.1
Crystallinity: 0%
Structure: diagonal grid

After 100 hours of tempering at 100 ° C in a circulating air dryer cabinet, the mechanical ones are Properties unchanged. The film shows no signs of embrittlement. The The film fulfills building material classes B2 and B1 according to DIN 4102 Part 2 / Part 1. The film is there UL test 94.

Example 2

According to the coextrusion technology, a 300 µm thick multi-layer PET film is used the order of layers A-B-A, where B is the core layer and A the cover layers represent. The core layer is 290 µm thick and the two outer layers that the Coating the core layer is 5 µm thick.

The polyethylene terephthalate used for the core layer B is identical to that of Example 1, but does not contain Sylobloc. The core layer contains 5% by weight  Flame retardant. The flame retardant is as in Example 1 in the form of a Masterbatches added. The masterbatch consists of 25% by weight flame retardant and 75% by weight of polyethylene terephthalate together. The flame retardant is identical with that from example 1.

The polyethylene terephthalate of cover layer A is identical to polyethylene terephthalate from Example 1, d. H. the top layer raw material is equipped with 0.1% by weight of Sylobloc. The Top layers do not contain flame retardants.

50% by weight of polyethylene terephthalate, 30% by weight of Polyethylene terephthalate recyclate and 20% by weight of the masterbatch according to the example 1 pre-crystallized, pre-dried and post-dried.

The top layer raw material does not undergo any special drying. Using coextrusion technology, a 300 µm thick film with the ABA layer sequence is produced, with a top layer A being structured (page 2), which has the following properties:
Layer structure: ABA
Total thickness: 300 µm
Surface gloss 1: side (unstructured side, measuring angle 20 °): 174
Light transmission: 91.2%
Turbidity: 3.1%
Surface defects (specks, orange peel, blisters ...): none
Yellowness index (YID): 3.9
Crystallinity: 0%
Structure: diagonal grid

After 100 hours of tempering at 100 ° C in a circulating air dryer cabinet, the mechanical ones are Properties unchanged. The film shows no signs of embrittlement.

The film fulfills building material class B2 and B1 according to DIN 4102 part 2 and part 1. The foil passes UL test 94.

Example 3

According to Example 2, a 400 micron thick A-B-A film is produced, the Core layer B is 390 µm and the outer layers A are each 5 µm thick.

The core layer B contains only 5% by weight of the masterbatch from Example 2.

The cover layers are identical to those from Example 2, but contain 20% by weight of the Masterbatches, which was only used for the core layer in Example 2.

The raw materials and the masterbatch for the core layer and the top layers are pre-crystallized, pre-dried and post-dried according to Example 1.

The multi-layer, one-sided structured 400 µm film manufactured using coextrusion technology has the following property profile:
Layer structure: ABA
Total thickness: 400 µm
Surface gloss 1st side (unstructured side, measuring angle 20 °): 170
Light transmission: 90.3%
Turbidity: 3.7%
Surface defects (specks, orange peel, blisters ...): none
Yellowness index (YID): 3.9
Crystallinity: 0%
Structure: diamond pattern

After 100 hours of tempering at 100 ° C in a circulating air dryer cabinet, the mechanical ones are Properties unchanged. The film shows no signs of embrittlement.

The film fulfills building material classes B2 and B1 according to DIN 4102 part 2 and part 1. The foil passes UL test 94.

surface

The film from Examples 1 to 3 show an aesthetic, advertising-effective appearance. The textured surface is insensitive to fingerprints and little sensitive to scratches.

Comparative Example 1

Example 1 is repeated. However, the film is not equipped with a masterbatch, i.e. H. the Foil contains no flame retardant. The foil is polished with a usual Chrome roller made without structure.

The transparent PET film produced has the following property profile:
Thickness: 300 µm
Surface gloss 1st page: 156
(Measuring angle 20 °) 2nd side: 151
Light transmission: 88%
Turbidity: 4.9%
Surface defects per m ² : none
Yellowness index (YID): 4.0
Structure: none

The unequipped film fulfills the tests according to DIN 4102 part 1 and part 2 as well as the UL Test 94 does not.

The film is not very effective in advertising. Every fingerprint is visible. At least Clean or in case of mechanical contact with yourself or other objects the film looks scratched and used.

Claims (11)

1. Amorphous, structured, flame-retardant film with a thickness in the range from 30 µm to 1000 µm, which contains a crystallizable thermoplastic as the main component, characterized in that it is provided with at least one structured surface and additionally contains at least one flame retardant which is soluble in the thermoplastic . 2. Film according to claim 1, characterized in that the concentration of Flame retardant in the range of 0.5 to 30.0 wt .-%, preferably from 1 to 20.0 wt .-%, based on the weight of the crystallizable thermoplastic, is. 3. Film according to claim 1 or 2, characterized in that as Flame retardant organic phosphorus compounds, preferably Carboxyphosphinic acids, their anhydrides and dimethyl methylphosphonate are included. 4. Film according to one or more of claims 1 to 3, characterized in that that the crystallizable thermoplastic made of polyethylene terephthalate, Polybutylene terephthalate or polyethylene naphthalate or mixtures thereof, preferably consists of polyethylene terephthalate. 5. Film according to one or more of claims 1 to 4, characterized in that the film is one or more layers, the multilayer film has at least one core layer and at least one cover layer.   6. Film according to claim 5, characterized in that the flame retardant in the top layer (s) is included. 7. Film according to one or more of claims 1 to 6, characterized in that that the regenerate is used. 8. Process for making an amorphous, structured, flame retardant equipped film made of a crystallizable thermoplastic with a thickness in the Range from 30 µm to 1000 µm, characterized in that a thermoplastic with at least one flame retardant that is soluble in the thermoplastic Masterbatch technology is added, and wherein the masterbatch pre-crystallizes and / or is pre-dried by an extrusion process to form a melt film shaped, drawn off via a structured take-off roller and as an amorphous film is solidified. 9. The method according to claim 8, characterized in that the flame retardant in the masterbatch in a ratio of flame retardant to thermoplastic in Range from 60 to 40 wt .-% to 10 to 90 wt .-% is present. 10. Use of the film according to one or more of claims 1 to 7 for Indoor and outdoor use. 11. Use according to claim 10 in the interior for interior paneling, for Exhibition stand construction and exhibition articles, as displays, for signs, for protective glazing from Machines and vehicles, in the lighting sector, in shop and shelf construction, as Promotional items, laminating medium and outdoors for greenhouses, Canopies, external cladding, covers in the construction sector and Illuminated advertising profiles, shadow mats and for electrical applications.