DE10108759A1 - Amorphous film consisting mainly of bibenzene-modified thermoplastic, especially polyester, used for production of composite film and formed products, e.g. laminates, glazing, packaging and thermoformed products - Google Patents

Abstract

The invention relates to single or multi-layer transparent amorphous films, containing as the main constituent a crystallisable bibenzol-modified thermoplastic with preferably an increased diethylene glycol and/or polyethylene glycol content, preferably a bibenzol-modified polyester, such as for example a bibenzol-modified polyethylene terephthalate, bibenzol-modified polybutylene terephthalate or bibenzol-modified polyethylene naphthalate, whose bibenzolic acid content is preferably between 1 and 50 wt. %. Said films are inherently UV stable and have a surface lustre of greater than 100, a light transmission greater than 64 % and an opacity of less than 30 %. Multi-layered embodiments of said films can be produced by extrusion or coextrusion, whereby the polymers used for the base and top layers preferably have similar standard viscosities. They can be functionally coated on one or both sides and are suitable for a plurality of interior and exterior applications.

Description

The invention relates to an amorphous, transparent film made of a crystallizable, bibenzolmodifizierten thermoplastics, a process for the preparation of this film and their use.

Transparent films of crystallizable thermoplastics are known.

These foils are not inherently UV stable, so neither the foils nor the foils made of articles for outdoor use. For outdoor applications show these films after a short time yellowing and deterioration the mechanical properties due to a photo-oxidative degradation by Sunlight.

In EP-A-0 620 245 are biaxially oriented, crystalline films of polyester described, which are improved in terms of their thermal stability. These slides contain antioxidants which are suitable radicals formed in the film trap and decompose formed peroxide. A suggestion, like the UV stability However, this document is not to be inferred from this document.

In DE 198 23 991 amorphous plates are described which contain as a main constituent a bibenzolmodifiziertes polyalkylene terephthalate and / or a bibenzolmodifiziertes polyalkylene naphthalate. These plates are 0.1 to 20 mm thick, amorphous, ie not crystalline. The plates are characterized in particular by good mechanical properties in a wide temperature range. Good mechanical properties are understood here to mean that no break occurs in the measurement of the impact strength a _n according to Charpy (ISO 179 / 1D) and that the Izod impact strength according to ISO 180 at -40 ° C. is preferably in the range from 10 to 140 kJ / m ² lies. The described amorphous plates are produced by means of smooth calendering technology and by freezing below the glass transition temperature by means of cooling and smoothing.

Object of the present invention was to provide a transparent, amorphous film with a Thickness of preferably 30 to 1000 microns to provide, in addition to an economic Thermoformability and good optical properties especially a high inherent Has UV stability.

High inherent UV stability means that the films can be exposed to sunlight or sunlight other UV radiation is not or only extremely little damaged, so that the Films are suitable for outdoor and / or critical indoor applications. In particular, the films should not yellow during outdoor use for many years, show no embrittlement or cracking on the surface and none Have deterioration of the mechanical eigenshells. High UV stability means that the film absorbs the UV light and light only in the visible Lets through the area.

The good optical properties preferably include a high light transmission (<64%), a high surface gloss (<100), a low haze (<30%) as well as a low yellowness index (YID <10).

Economic thermoformability means that the film on commercial Thermoforming machines without unprofitable predrying to complex and deep-drawing or thermoforming large-area moldings.

In addition, the film according to the invention should be recyclable, in particular without significant deterioration of the optical and mechanical properties.  

This object is achieved by a transparent, amorphous film with a thickness in the Range of preferably 30 to 1000 .mu.m, the main component of a crystallizable, contains benzene-modified thermoplastics. Such a film is inherently UV stable.

The film according to the invention contains as its main constituent a crystallisable, bibenzol modified thermoplastics. Suitable crystallizable or semi-crystalline For example, bibenzol modified thermoplastics are polyesters such as bibenzo-modified polyethylene terephthalate (PETBB), bibenzo-modified Polybutylene terephthalate (PBTBB), bibenzo-modified polyethylene naphthalate (PENBB), with bibenzo-modified polyethylene terephthalate (PETBB) being preferred.

According to the invention, bibenzol-modified crystallizable thermoplastics are understood

• Crystallizable bibenzo-modified copolymers,
• Crystallizable bibenzo-modified compounds,
• Crystallizable bibenzol modified recycle and
• Other variations of crystallizable bibenzo-modified thermoplastics,

wherein crystallizable bibenzo-modified copolymers are preferred.

For the preparation of the preferred copolymers polyalkylene terephthalate or Polyalkylene naphthalate can in addition to the main monomers such. B. Dimethyl terephthalate (DMT), ethylene glycol (EG), propylene glycol (PG), 1,4-butanediol, Terephthalic acid (TA), bisbenzoic acid (BB), 2,6-naphthalenedicarboxylate (NDC) and / or 2,6-naphthalene dicarboxylic acid (NDA), also isophthalic acid (IPA), trans and / or cis-1,4- Cyclohexanedimethanol (c-CHDM, t-CHDM or c / t-CHDM) can be used.

Main ingredient is that the amount of bibenzo-modified thermoplastic, based on the weight of the layers equipped therewith, preferably between 50 and 99.9% by weight, more preferably between 75 and 99% by weight. The rest of 100% quantity can be further additives customary for film production.  

Bibenzolmodifizierte polyethylene terephthalate polymers having a crystallite melting point T _m , measured by DSC (Differential Scanning Calorimetry) at a Aufheizge speed of 20 ° C / min. from 180 ° C to over 365 ° C, preferably from 180 ° C to 310 ° C, depending on the bibenzolic acid content, with a crystallization temperature range T _c between 75 ° C and 280 ° C, a glass transition temperature T _g between 65 ° C and 130 ° C and with a density, measured according to DIN 53479, of 1.15 to 1.40 g / cm ³ and a crystallinity in the range between 10% and 65%, preferably between 20% and 65%, are preferred starting materials for the preparation of inventive film.

Bibenzolmodifizierte polyethylene naphthalate polymers having a crystallite melting point T _m , measured by DSC (Differential Scanning Calorimetry) at a Aufheizge speed of 10 ° C / min. from 120 ° C to 310 ° C, preferably from 140 ° C to 280 ° C, depending on the bibenzolic acid content, with a crystallization temperature range T _c between 75 ° C and 280 ° C, a glass transition temperature T _g between 65 ° C and 120 ° C and having a density, measured according to DIN 53479, of 1.20 to 1.45 g / cm ³ and a crystallinity in the range between 10% and 65%, preferably between 20% and 65%, further preferred starting materials for the preparation of the inventive Slide.

It is preferred that the crystallisable thermoplastic has a diethylene glycol content (DEG) of <1.0 wt .-%, preferably <1.2 wt .-%, in particular <1.3 wt .-% and / or a polyethylene glycol content (PEG) of <1.0% by weight, preferably <1.2% by weight, in particular <1.3% by weight and / or an isophthalic acid content of 3% by weight to 10% by weight having.

Preferably, the bibenzolic acid content of the thermoplastics for the inventive Foil in the range between 1 and 50% by weight, preferably between 5 and 45% by weight, in particular between 10 and 40% by weight.  

The film according to the invention can be both single-layered and multilayered. The Film can also be coated with various copolyesters or adhesion promoters.

Under amorphous film in the context of the present invention, such films Although, the crystallizable thermoplastic has a crystallinity of 10% 65%, preferably from 20% to 65%, are themselves not crystalline. Not crystalline, d. H. amorphous or substantially amorphous, means that the Crystallinity level of the film is generally less than 3%, preferably less than 1%. Such a film is substantially in the unoriented state. The The degree of crystallinity is determined by the density determination according to ASTM D 1505-68, method C, determined at a temperature of 23 ° C. There is one between density and crystallinity linear relationship. The higher the density, the higher the crystallinity.

Light, in particular the ultraviolet portion of solar radiation, d. H. the Wavelength range of 280 to 400 nm, induces degradation of thermoplastics, as a result, not only the visual appearance due to color change or yellowing changes, but also the mechanical-physical properties be negatively influenced.

The inhibition of these photooxidative degradation processes is of considerable technical and economic importance, otherwise the possible applications of numerous thermoplastics are drastically limited.

For example, unmodified polyethylene terephthalates begin below below Absorb 360 nm UV light, its absorption decreases below 320 nm considerably and is very pronounced below 300 nm. The maximum absorption is between 280 and 300 nm.

In the presence of oxygen, thermoplastics become predominantly Chain scission, but no crosslinks observed. carbon monoxide, Carbon dioxide and carboxylic acids represent the quantitatively predominant  Photooxidation products. In addition to the direct photolysis of the ester groups must oxidation reactions may still be considered using peroxide radicals also result in the formation of carbon dioxide.

The photooxidation of z. B. polyethylene terephthalates can also over Hydrogen cleavage in the a-position of the ester groups to hydroperoxides and their Decomposition products as well as associated chain cleavages (H. Day, D.M. Wiles: J. Appl. Polym. Sci 16, 1972, 203).

UV stability can basically be achieved by adding UV stabilizers become. UV stabilizers, d. H. UV absorbers as light stabilizers, are chemical Compounds involved in the physical and chemical processes of light-induced Intervene degradation. Soot and other pigments can partially Cause light protection. However, these substances are for transparent films unsuitable because they lead to discoloration or color change. For transparent films Only organic and organometallic compounds are suitable, the to stabilizing thermoplastics no or only an extremely small color or Give color change.

UV stabilizers are very expensive, partially evaporate during film production or migrate over time, leaving the film an undesirable after 1 to 2 years Pavement shows. As a result, the gloss and the transparency of the film are disadvantageous affected.

In light of the fact that UV stabilizers can provide protection, the skilled person would have used commercially available UV stabilizers. He would have found that

• - The UV stabilizer has a lack of thermal stability and at Temperatures between 200 ° C and 240 ° C decomposes or outgassing
• - Large amounts (about 10 to 15 wt .-%) UV stabilizer are incorporated so that the UV light is absorbed and the film is not damaged.

At these high concentrations, the film is yellow after production Yellow number differences (YID) by about 25. Furthermore, the mechanical Properties of such a film negatively affected. In the film production occur Problems on such. B.

• - nozzle deposits, which leads to profile fluctuations
• - Roller deposits from the UV stabilizer, resulting in the impairment of optical properties (turbidity, adhesive defect, inhomogeneous surface) leads
• - deposits during the manufacturing process.

It was therefore surprising that an excellent UV protection could already be achieved by using a bibenzol-modified thermoplastic without the addition of UV stabilizers. It was also surprising that this high level of inherent UV protection

• The yellowness of the film compared to a standard PET film Homopolymer does not change within the measurement accuracy;
• - No outgassing, no nozzle deposits set, causing the film has an excellent appearance and an excellent profile and a excellent flatness has .;
• - The inherently UV-stabilized film by an excellent process capability characterized, so that they are produced process-safe and production-safe can be. Thus, the film of the invention is also economically viable.

It should also be mentioned that the waste material used in the Film production occurs during operation, as a regenerate for the film production again can be used without negatively affecting the yellowness of the film thus produced.

The thermoforming process usually involves the steps of predrying, heating, Shaping, cooling, demolding, tempering. In the thermoforming process it was found that the films according to the invention without prior predrying surprisingly deep-draw. This advantage compared to z. B. thermoformable polycarbonate or polymethyl methacrylate films, where appropriate depending on  Pre-drying times of 10-15 hours, at temperatures from 100 ° C to 120 ° C are required, drastically reduces the cost of the forming process. Besides It was surprising that the detail reproduction of molded articles produced from it is excellent. The film can also, for example, as a roll the Thermoforming process are supplied.

For the thermoforming of the film according to the invention, the following process parameters have generally proved suitable:

step Film according to the invention Pre-drying not mandatory Temperature of the mold 100 to 140 ° C Heating time per 10 μm film thickness <5 sec per 10 μm film thickness Film temperature during deformation 100 to 160 ° C Possible draw factor 1.5 to 4.0 Detail reproduction outstanding Shrinkage (shrinkage) <1.5%

Furthermore, the film is suitable for the production of composite films, wherein the Composite z. Example of the film according to the invention, optionally with an ethylene Vinyl alcohol copolymer, ethyl vinyl alcohol, polyvinyl alcohol or polyvinylidene di Chloride coating is provided, and a second film. This second slide can z. B. also a bibenzolmodifizierte Thermoplasffolie, a standard thermo plastic film, such as. As a polyethylene terephthalate or a polyolefin such. B. a polyethylene or polypropylene film.

The second film may be single-layered or multi-layered and may be like the first film amorphous, d. H. be unoriented, and may, for. B. have a sealing layer. The second Film can be bonded with or without adhesive to the first, inventive film his.  

The thickness of this second film is preferably in the range of 30 to 500 microns.

The composite film is generally obtained by lamination or Laminating the two films, with or without intermediate adhesive layer, by passing the films between tempered at 30 ° C to 90 ° C rollers passes.

The two films can, for example, with or without adhesive layer by a Laminating be joined together. It is, for example, too possible, the second z. B. transparent colored, layer on the first, coated Layer by in-line coating (melt extrusion onto an existing layer) applied.

When using adhesives, these are applied to a film surface by known methods, in particular by application of solutions or dispersions in water or organic solvents. The solutions usually have an adhesive concentration of 5 to 40% by weight in order to give an amount of adhesive of preferably 1 to 10 g / m ² on the film.

Particularly useful adhesives have proven that of thermoplastic Resins, such as cellulose esters and ethers, alkyl and acrylic esters, polyamides, Polyurethanes or polyesters, or thermosetting resins such as epoxy resins, Urea / formaldehyde, phenyl / formaldehyde or melamine / formaldehyde resins, or consist of synthetic rubbers.

As a solvent for the adhesive itself z. As hydrocarbons, such as ligroin and toluene, esters, such as ethyl acetate, or ketones, such as acetone and methyl ethyl ketone.

The surface gloss of the film according to the invention, measured according to DIN 67530 (Measuring angle 20 °), is preferably greater than 100, preferably greater than 110, the Light transmission L, measured according to ASTM D 1003, is preferably more than 64%,  preferably more than 66%, and the haze of the film measured according to ASTM D 1003, is preferably less than 30%, preferably less than 25%, which is for the achieved UV stability is surprisingly good.

The standard viscosity SV (DCE) of the preferably to be used bibenzolmodifi grained polyethylene terephthalate, measured in dichloroacetic acid according to DIN 53728, is between 600 and 1300, preferably between 700 and 1200.

The bulk density, measured according to DIN 53466, is preferably between 0.75 kg / dm ³ and 1.0 kg / dm ³ , and more preferably between 0.80 kg / dm ³ and 0.90 kg / dm ³ .

The polydispersity of the likewise preferred bibenzo-modified polyalkylene naphthalate or bibenzo-modified polyalkylene terephthalate M _w / M _n, measured by GPC, is preferably between 1.5 and 4.0 and more preferably between 2.0 and 3.5.

The film according to the invention can be both single-layered and multilayered.

In the multilayer embodiment, the film is at least one core layer and at least one cover layer, wherein in particular a three-layered A-B-A or A-B-C structure is preferred, wherein the outer layers A and C are the same or can be different. There may also be additional intermediate layers be present, so that z. B. a total of 5 layers.

For this embodiment it is advantageous if the bibenzol modified thermoplastic the core layer has a similar standard viscosity as the bibenzol modified Thermoplastic coating layers adjacent to the core layer.

In a further particular embodiment, the cover layers can also be made an unmodified polyalkylene terephthalate homopolymer, from a  bibenzo-modified and / or unmodified polyalkylene naphthalate polymers or from a bibenzol-modified and / or unmodified polyalkylene terephthalate Polyalkylene naphthalate copolymers or compound exist. Even in these cases PET and PEN are preferred polymers to use.

In this embodiment, the thermoplastics of the outer layers are preferred also similar standard viscosities such. B. the bibenzolmodifizierte polyalkylene terephthalate of the core layer.

The film may also be corona treated at least on one side and / or at least On one side with a scratch-resistant coating, with a copolyester or with a Adhesive coated and / or with ethylene-vinyl alcohol copolymer, ethyl Be coated vinyl alcohol, polyvinyl alcohol or polyvinylidene dichloride.

According to the invention, the film may be coated on at least one of its surfaces, so that the coating on the finished film has a thickness of preferably 5 to 100 nm, preferably 20 to 70 nm, in particular 30 to 50 nm. The coating is preferably applied in-line, ie during the film manufacturing process. Particularly preferred is the application by means of the so-called "reverse gravure roll coating" process, in which the coatings can be applied very homogeneously in the layer thicknesses mentioned. The coatings are preferably applied as solutions, suspensions or dispersions, particularly preferably as aqueous solution, suspension or dispersion. The coatings mentioned give the film surface an additional function z. B. is the film thereby sealable, printable, metallizable, sterilizable, antistatic or they improve z. The aroma barrier or allow adhesion to materials that would otherwise not adhere to the film surface (e.g., photographic emulsions). Examples of substances / compositions which confer additional functionality are:
Acrylates, such as For example, WO 94/13476 describes ethylvinyl alcohols, PVDC, water glass (Na ₂ SiO ₄ ), hydrophilic polyesters (5-Na-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 94/13481, polyvinyl acetates, polyurethanes, alkali metal or alkaline earth metal salts of C 10 -C 18 fatty acids, butadiene copolymers with Acrylonitrile or methylmethacrylate, methacrylic acid, acrylic acid or their esters The substances / compositions which confer the additional functionality may contain the usual additives, such as antiblocking agents, pH stabilizers in amounts of preferably from 0.05% by weight to 5% Wt .-%, preferably 0.1 wt .-% to 3 wt .-% contain wt .-% are in each case based on the weight of the coating agent (eg., Solution, emulsion, dispersion).

The substances / compositions mentioned are used as dilute solution, emulsion or dispersion preferably as an aqueous solution, emulsion or dispersion on a or both film surfaces applied, and then the solvent volatilized by means of temperature treatment. The dried coatings have then layer thicknesses of preferably 5 to 100 nm, preferably 20 to 70 nm, in particular 30 to 50 nm.

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

Weathering tests have shown that the films of the invention even at Weathering tests with extrapolated 5 to 7 years outdoor use in general no yellowing, no embrittlement, no gloss loss of the surface, none Cracking on the surface and no deterioration of the mechanical Have properties.

In the production of the film, it was found that the film according to the invention can be produced very economically. Furthermore, no outgassing in Production process found, which is very beneficial.  

In addition, measurements of cold resistance (DIN 53372) showed that the film up to a temperature of -200 ° C meets the requirements of the standard, d. H. Not brittle.

Furthermore, the film according to the invention is free from environmental pollution and loss the mechanical properties are easily recyclable, making them themselves for example, for use as short-lived billboards or others Promotional and / or thermoformed items is suitable.

The preparation of the film according to the invention can, for example, according to a known extrusion process in an extrusion line.

The films can be prepared by a known method from a bibenzolmodifiziert Thermoplastics and optionally other raw materials and / or other conventional additives in usual amount of about 0.1 to a maximum of 10 wt .-% both as monofilms and as multilayer, optionally coextruded films with the same or different trained surfaces are produced, with a surface, for example is pigmented and the other surface contains no pigment. Likewise, a or both surfaces of the film according to known methods with a conventional functional coating be provided. The others mentioned Raw materials / additives are preferred by means of the so-called masterbatch technology dosed, but they can also be incorporated directly at the raw material manufacturer.

The polymers or raw material mixtures are an extruder or in multilayer Sheets fed to multiple extruders. About existing foreign body or Impurities can be filtered out of the polymer melt prior to extrusion. The melt (s) are then in a Monodüse or in a multilayer case in a Multilayer nozzle formed into flat melt films and in the multilayer case layered on top of each other. Subsequently, the monofilm or the multilayer film quenched with the aid of a chill roll and as amorphous or largely amorphous,  d. H. solidified unoriented film. Subsequently, the cooled, amorphous film lined and wound up.

Due to the surprising combination of excellent properties is the Inventive film excellent for a variety of applications, For example, for interior trim, for trade fair construction and trade show products, as Displays, for signs, for protective glazing of machines and vehicles, in Lighting sector, in shop and shelf construction, as promotional items, as laminating medium, as packaging film, as a composite film, as a furniture film and in particular for Application in the thermoforming sector, d. H. for producing a variety of moldings.

Due to the good UV stability and low temperature resistance, the inventive is Film also for outdoor applications, such. For greenhouses, roofs, Exterior cladding, covers, applications in the construction sector, applications in the Refrigeration and freezing areas and for illuminated advertising profiles, in credit cards, telephone cards or other card sector.

The invention will be explained in more detail below with reference to exemplary embodiments.

The measurement of the individual properties is carried out according to the following standards or procedure.

measurement methods

DIN = German Institute for Standardization
ISO = International Organization for Standardization
ASTM = American Society for Testing and Materials

DEG content / PEG content / IPA content

The DEG / PEG / IPA content is gas chromatographically after saponification in methanoli shear KOH and neutralization with aqueous HCl.  

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 understand the incident amount of light.

The light transmission is measured with the measuring device "Hazegard plus" (Byk Gardener, Germany) according to ASTM D 1003.

cloudiness

Turbidity is the percentage of transmitted light emitted by the incident light beam deviates on average by more than 2.5 °. The focus will be determined at an angle smaller than 2.5 °.

The haze is measured with the "Hazegard plus" measuring instrument according to ASTM D 1003.

surface defects

The surface defects are determined visually.

SV (DCE), IV (DCE)

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

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

IV (DCE) = 6.67.10 ^-4. SV (DCE) + 0.118

Weathering (two-sided), UV stability

The UV stability is tested according to the test specification ISO 4892 as follows
Test equipment: Atlas Ci 65 Weather Ometer (Atlas, England)
Test conditions: ISO 4892, ie artificial weathering
Irradiation time: 1000 hours (per page)
Irradiation: 0.5 W / m ² , 340 nm
Temperature. 63 ° C
Relative humidity: 50%
Xenon lamp: inner and outer filter made of borosilicate
Irradiation cycles: 102 minutes UV light, then 18 minutes UV light with water spray on the samples, then again 102 minutes UV light, etc.

yellowness

The yellow value YID is the deviation from the colorlessness in the direction "yellow" and becomes measured according to DIN 6167.

cold resistance

The cold resistance is determined according to DIN53372.

In the following examples and comparative examples are each transparent films of different thickness produced on an extrusion line become.

All films were tested according to the test specification ISO 4892 on both sides per 1000 hours per Page with the Atlas Ci 65 Weather Ometer of the company Atlas weathered and then concerning thermoformability, discoloration, surface defects, the Turbidity, gloss and low temperature tested.

Examples example 1

A 150 μm thick, transparent, single-layer, amorphous film was produced, containing as the main constituent PETBB and 0.1% by weight Sylobloc®.  

The Sylobloc used (SiO ₂ , Grace, Germany) was added in the form of a masterbatch containing 10,000 ppm Sylobloc in addition to PETBB.

The PETBB from which the transparent film was made had one Standard viscosity SV (DCE) of 1010, which corresponds to an intrinsic viscosity IV (DCE) of Corresponds to 0.792 dl / g. The bisbenzene acid content was 15% by weight, the Glass transition temperature was 86 ° C. The DEG content was 2.1% by weight.

Example 2

Analogously to Example 1, a transparent film 150 μm thick monofilm was prepared. In contrast to Example 1, 25 wt .-% self-regenerant were used.

The film was coated on both sides by means of "reverse gravureoll coating" process with an aqueous dispersion. The dispersion contained, in addition to water, 3% by weight of hydrophilic polyester (5-Na-sulfoisophthalic acid-containing PET / IPA polyester, SP41®, Ticona, USA), 0.1% by weight of colloidal silica (Nalco 1060®, Deutsche Nalco Chemie, Germany) as antiblocking agent and 0.1% by weight of ammonium carbonate (from Merck, Germany) as pH buffer. The wet application weight was 1.5 g / m ² per coated side. After drying, the calculated thickness of the coating was 50 nm.

Example 3

After coextrusion technology, a 150 mm thick multilayer PETBB was used. Film produced with the layer sequence A-B-A, where B is the core layer and A the Cover layers represented. The core layer B was 146 mm thick and the two Topcoats covering the core layer were each 2 mm thick.

The PETBB used for the core layer B was identical to that of Example 1, the Core layer, however, contained no Sylobloc.  

The composition of the outer layers A was identical to the composition the monofilm of Example 1, d. H. the topcoat stock was 0.1 wt% Sylobloc equipped.

Comparative Example 1 (VB1)

Analogously to Example 1 was a 150 micron thick monofilm of PET homopolymer manufactured. Again, the SV value of the unmodified PET used was Homopolymer at 1010. The DEG content was 0.6 wt .-%.

The film was not coated in-line.

The properties of the films thus produced are shown in Table 1 below played.

Table 1

Property profile of the produced films

After each 1000 hours of weathering per side show with Atlas Ci 65 Weather Ometer the bibenzol modified PET films from Examples B1 to B3 hardly changed Properties.  

After 1000 hours of weathering per page with Atlas Ci 65 Weather Ometer, the Film of Comparative Example VB1 on the surfaces cracks and embrittlement phenomena. A precise property profile - especially regarding the mechanical properties - therefore can no longer be measured. also This film shows a visually visible yellowing.

Claims (23)

1. Amorphous, single or multilayer film, characterized in that it contains as a main component a crystallizable, bibenzolmodifizierten thermoplastic. 2. A film according to claim 1, characterized in that the degree of crystallinity of Film is less than 3%, preferably less than 1%. 3. A film according to claim 1 or 2, characterized in that the amount of the bibenzol modified thermoplastics, based on the weight of it finished layers, 50 to 99.9% by weight, preferably 75 to 99% by weight, is. 4. A film according to one or more of claims 1 to 3, characterized in that it consists of a base layer B and two cover layers A and C is constructed with the layer sequence A-B-C, wherein the cover layers may be the same or different. 5. A film according to one or more of claims 1 to 4, characterized characterized in that the thermoplastic is a bibenzolmodifizierter polyester is used. 6. A film according to one or more of claims 1 to 5, characterized characterized in that bibenzol modified as bibenzolmodifizierter polyester Polyethylene terephthalate, bibenzo-modified polybutylene terephthalate or bibenzo-modified polyethylene naphthalate is used.   7. A film according to one or more of claims 1 to 6, characterized characterized in that bibenzolmodifi. as bibenzolmodifizierter thermoplastic ziert polyethylene terephthalate is used. 8. A film according to one or more of claims 1 to 7, characterized characterized in that the bibenzolmodifizierte thermoplastic a Diethylenglykolgehalt of greater than 1.0 wt .-%, preferably greater than 1.2 wt .-%, in particular greater than 1.3 wt .-%, and / or a polyethylene glycol content of greater than 1.0% by weight, preferably greater than 1.2% by weight, in particular greater than 1.3% by weight, and / or has an isophthalic acid content of 3 to 10 wt .-%. 9. A film according to one or more of claims 1 to 8, characterized characterized in that the standard viscosity SV (DCE) of the bibenzol modified polyethylene terephthalate between 600 and 1300, preferably between 700 and 1200, lies. 10. A film according to one or more of claims 1 to 9, characterized characterized in that the bibenzolic acid content, based on the weight of the bibenzo-modified thermoplastics, 1 to 50% by weight, preferably 5 to 45% by weight, especially 10 to 40 wt .-%, is. 11. A film according to one or more of claims 1 to 10, characterized characterized in that the cover layers are a bibenzol modified Thermoplastics, preferably those of the base layer containing. 12. A film according to one or more of claims 1 to 11, characterized characterized in that the cover layers unmodified Polyalkylentereph thalate, bibenzo-modified and / or unmodified polyalkylene naphthalate or bibenzo-modified and / or unmodified polyalkylene terephthalate Polyalkylene naphthalate copolymer.   13. A film according to one or more of claims 1 to 12, characterized characterized in that the polymers of the base and the cover layers are similar Have standard viscosities. 14. A film according to one or more of claims 1 to 13, characterized characterized in that the film is functional on one or both surfaces is coated. 15. A film according to one or more of claims 1 to 14, characterized characterized in that it has a surface gloss of greater than 100, preferably greater than 110, has. 16. A film according to one or more of claims 1 to 15, characterized characterized in that it has a light transmission of greater than 64%, preferably greater than 66%. 17. A film according to one or more of claims 1 to 16, characterized characterized in that it has a haze of less than 30%, preferably less than 25%. 18. A film according to one or more of claims 1 to 17, characterized characterized in that the film conventional additives such as antiblocking agents, Contains stabilizers or lubricants. 19. Inherently UV-stabilized film, characterized in that it is a film according to one or more of claims 1 to 18 corresponds. 20. A process for producing a film according to one or more of the claims 1 to 19, characterized in that the one for the production of the film required starting materials extruded through a monodüse or at multilayer structure coextruded through a multi-layer die, the obtained  Foil quenched and solidified and optionally one or both sides coated. 21. Use of a film according to one or more of claims 1 to 19 for Production of composite films. 22. Use of a film according to one or more of claims 1 to 19 for Production of moldings. 23. Moldings produced using a film according to one or more of claims 1 to 19.