WO2006005090A1

WO2006005090A1 - Method for producing a composite body

Info

Publication number: WO2006005090A1
Application number: PCT/AT2005/000248
Authority: WO
Inventors: Johann Kappacher; Thomas Sitka
Original assignee: Senoplast Klepsch & Co. Gmbh
Priority date: 2004-07-08
Filing date: 2005-07-01
Publication date: 2006-01-19
Also published as: EP1763435A1

Abstract

The invention relates to a method for producing a composite body during which preferably impact resistant-modified polymethylmethacrylate (PMMA) and an organometallic compound, preferably polyorganosiloxane, is coextruded or laminated together with at least one of the following polymers or mixtures thereof: polystyrene (PS), acrylonitrile butadiene styrene (ABS), polymethylmethacrylate (PMMA), impact resistant-modified polymethylmethacrylate(HI-PMMA), acrylonitrile styrene acrylic ester (ASA), polycarbonate (PC), a blend consisting of polycarbonate and polyethylene (glycol) terephthalate (PC-PET(G)), a blend consisting of polycarbonate and polybutylene terephthalate (PC-PBT), a blend consisting of acrylonitrile butadiene styrene and polycarbonate (ABS-PC), a blend consisting of acrylonitrile styrene acrylic ester and polycarbonate (ASA-PC),and a blend consisting of acrylonitrile butadiene styrene and polyamide (ABS-PA) in order to form a composite body (1) having at least one covering layer (S1) and at least one additional layer (S3).

Description

Method for producing a composite body

The present invention relates to a method for producing a composite body.

Such composites often consist of a support layer of acrylonitrile-butadiene-styrene copolymers (ABS) on which a top layer of polymethyl methacrylate (PMMA) is disposed to improve the weathering properties, surface hardness, gloss and chemical resistance of the composite. Between the carrier layer and the cover layer, further layers can also be arranged. It can also be provided on both sides of the carrier layer cover layers. The composite bodies are usually produced by coextrusion of all layers or lamination, to which the thermoforming or hot edge of the composite board produced in this way can be added to form a shaped body.

Generic composites can be used anywhere where the replacement of painted surfaces by co-extruded or laminated surfaces is desired, for example in the sanitary sector, motor vehicles, commercial vehicles, furniture, refrigerators and in the advertising industry.

Composite bodies with a cover layer of PMMA have the problem that they need to be improved in terms of abrasion and scratch resistance, dirt repellence and chemical resistance to painted surfaces.

As is apparent from DE 38 21 337, it is already known in the prior art to improve impact-modified PMMA with respect to its notched impact strength by addition of a polyorganosiloxane. The problem with this is that in the introduction of the polyorganosiloxanes described therein, they are distributed uniformly over the entire volume of the mass, while the desirable improvement in the surface properties of the PMMA cover layer is produced only by the polyorganosiloxanes which are located on the surface.

The production of a cover layer of this PMMA mass thus appears uneconomical, since a much too large amount of polyorganosiloxanes is needed in relation to the improvement achieved, which is associated with high costs. On the other hand, it is not possible, the polyorganosiloxanes simply as a thin film on the PMMA cover layer of the composite body, since such a layer is quickly removed by environmental influences.

The object of the invention is to provide a generic composite body in which the surface properties of the PMMA cover layer are improved by a permanent, resistant to external influences enrichment of polyorganosiloxanes in the outer region of the PMMA cover layer.

This is inventively achieved in that - preferably impact-modified - polymethyl methacrylate (PMMA) and an organometallic compound, preferably polyorganosiloxane, together with at least one of the following polymers or mixtures thereof: polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polymethyl methacrylate ( PMMA), toughened polymethyl methacrylate (HI-PMMA), acrylonitrile-styrene-acrylic ester (ASA), polycarbonate (PC), blend of polycarbonate and polyethylene glycol (PC-PET (G)), blend of polycarbonate and polybutylene terephthalate (PC PBT), blend of acrylonitrile-butadiene-styrene and polycarbonate (ABS-PC), blend of acrylonitrile-styrene-acrylic ester and polycarbonate (ASA-PC), blend of acrylonitrile-butadiene-styrene and polyamide (ABS-PA); to a composite body having at least one cover layer and at least one further layer are coextruded or laminated, and that the at least one cover layer (S-O consists essentially of - preferably impact-modified - PMMA and the organometallic compound.

Preferably, the extruded or laminated composite is deep-drawn or hot-edged into a molded article.

The invention is based on the surprising discovery that the molecules of the organometallic compound compounded into the PMMA mass by heating the mass, for example by the process of coextrusion or lamination, due to the surface activity of the long-chain organic compounds with the organometallic part, which oriented in air, can migrate to the surface of the PMMA mass and so form a molecular film, which causes the desired physicochemical properties. The organic moiety of the macromolecule is physically entangled in the PMMA matrix, making wiping the layer physically and chemically impossible. This shows that the concentration of the organometallic compound in the PMMA mass is greatest in the region of its surface. The improvements in surface properties achieved, such as scratch resistance and lower wettability, by which the tribological properties of the coextruded or laminated surfaces improve, therefore surprisingly result even with a lower total amount of the organometallic compound in the PMMA, for example already with an addition of 0 , 1 - 5 weight percent, preferably 0.2 - 1, 5 weight percent of the organometallic compound to PMMA.

The migration of the organometallic molecules to the surface takes place optimally when the layer formed from the PMMA and the organometallic compound has a temperature above the glass transition temperature of the PMMA, which is exceeded anyway during coextrusion or lamination, since the polyorganosiloxanes are not yet firmly in the Inside the layer formed from the PMMA and the organometallic compound are incorporated. If necessary, can also be heated externally, for example, in a deep drawing process.

It is on the one hand possible to mix the PMMA and the organometallic compound in the granular state prior to coextrusion and to homogenize in the coextrusion in situ to form a polymer compound. On the other hand, even before the coextrusion, a polymer compound of the PMMA and the organometallic compound can be prepared and then this polymer compound can be coextruded.

If laminated instead of coextrusion, a lamination film must first be produced by (co) extrusion. For this purpose, the PMMA and the organometallic compound can either be homogenized in situ or a precompound is prepared. Subsequently, in both cases, the lamination.

In the second case, the preparation of the polymer compound can be carried out, for example, by mixing the PMMA and the organometallic compound in the screw of an extruder. This eliminates an additionally required process step, since the PMMA must be extruded anyway. It is also possible to re-granulate the polymer compound of PMMA and the organometallic compound after its formation and before coextrusion or lamination.

The invention also relates to a composite body having at least one cover layer and a further layer, as produced, for example, by the method described wherein at least one of the further layers comprises at least one of the following polymers: PS, ABS, PMMA, HI-PMMA, ASA, PC, PC-PET (G), PC-PBT, ABS-PC, ASA-PC, ABS PA or mixtures thereof, and the at least one cover layer of - preferably impact-modified - PMMA and an organometallic compound - preferably polyorganosiloxane - exists.

Preferably, a composite body can be produced from the composite body by deep drawing or hot edges.

To improve the mechanical properties of the composite it may be provided that it has at least two, preferably three or five, layers, wherein at least one cover layer consists of PMMA and the organometallic compound and at least one of the further layers consists of one of the following polymers or mixtures thereof : PS, ABS, PMMA, HI-PMMA, ASA, PC, PC-PET (G), PC-PBT, ABS-PC, ASA-PC, ABS-PA.

It can also be provided that both cover layers of the composite body consist of PMMA and the organometallic compound. This is especially advantageous when the layers arranged between the cover layers consist of PMMA. The composite body then consists entirely of acrylic, with its surfaces having the desired properties.

In the case of a two-layer composite body, in particular a composite panel or film, the advantageous surface properties already result if the total thickness of the composite body is 0.05 to 13 mm and the thickness of the cover layer of the PMMA and the organometallic compound is 0.01 to 2 mm. In the case of a five-layer composite body, particularly advantageous mechanical properties and surface properties result if the total thickness of the composite body is 0.05 to 13 mm and the thickness of the further layers is 0.01 to 9 mm in each case.

For example, especially with a total thickness of the composite body of 13 mm, the main extruder layer (the thickest layer) may be 4 to 9 mm thick.

The advantageous properties of inventive composite bodies are explained by way of example with reference to the following tests. Example 1 relates to a coextruded composite panel. Example 2 relates to a laminated composite panel, Example 3 relates to further coextruded composite panels: Example 1 :

A sanitary panel produced by the method according to the invention, consisting of an ABS / PMMA composite, having a 5% coextruded PMMA top layer (relating to total thickness, for example a PMMA top layer of 200 μm at 4 mm total plate thickness, was tested ): In this top layer, 2.5 percent by weight of polyorganosiloxane were incorporated. The incorporation on the extruder can be done by various methods.

Tests were carried out on the extruded plate and on the deep-drawn part. The deep-drawn part was deep-drawn by default with a PE protective film. Checked was on

1. Scratch resistance

2. Sliding friction (Slip property)

3. Surface tension

ad 1. scratch resistance:

Used Scratch Resistance Tester: Universal Scratch Tester Model 413 from Ericsson.

The test was carried out in accordance with ISO 4586-2: 1997-14. As a measure of the behavior under scratch stress applies the lowest weight, which has still caused a self-contained marking on all 3 specimens.

Results:

TABLE 1

Visible is an increase in the scratch resistance (PMMA surface) of the composite panel (specimen) according to the invention by almost 100% compared to the comparison body.

ad 2. Sliding friction (Slip property):

The test device consists of a frame with a movable support surface. This support surface can be moved from the horizontal at a constant tilting speed (via an electric motor) to the vertical. It measures the angle at which a arranged on the support surface support weight begins to slip. The bearing surface (sliding surface) is equipped with a felt. The contact surface is 63 x 63 mm. As a support weight, a steel weight was used with a net weight of 504 grams.

The sample to be tested (plate) is placed on the support surface, which is in the 0 ° position, with the surface to be tested upwards (about DIN A4, thickness between about 1 - 6 mm). On the surface to be tested, the steel weight is placed with the felt covering. Thereafter, the support surface, driven by an electric motor, moves uniformly around the fulcrum. In the range of 0 ° to 50 °, a uniform lifting speed of about 37 sec. respected. On the side of a protractor is attached to the inclination of the support surface can always be checked.

The test person moves the support surface by pressing a button around the fulcrum, constantly monitoring the weight. When the weight begins to slide off, the button for the lifting drive is released, whereby the support surface is stopped in the upward movement ung.

The inclination of the support surface is measured on the protractor and noted. The smaller the angle, the lower the coefficient of friction. Results:

TABLE 2:

Visible is a significant reduction in the sliding friction of the composite panel according to the invention (test specimen) relative to the comparison body.

ad 3. Measurement of the surface tension:

The contact angle and surface tension were determined on ABS / PMMA sheets of the type described above with addition of 2.5% and 5% polyorganosiloxane, respectively. The surface energy and the contact angle of composite bodies according to the invention were determined before and after deep-drawing.

Determination of the surface energy:

The following test fluids were used: water, glycerol, ethylene glycol, 1-octanol and n-dodecane. Surface tension of test liquids for contact angle measurement:

The measurement is carried out with a contact angle measuring device from Krüss (G2). The advancing angle of the sample drop on the test plate is measured in the range between 8-12 μl drop volume. The evaluation method used is the method according to Owens-Wendt-Rable & Kaelbe. This method is mainly used for low energy surfaces (polymers). With the contact angle measurements of the liquid drops on the surface of the solid polymers, both the total surface tension of the solid and the polar and dispersive fractions can be determined.

Results - Contact Angle: TABLE 3:

Result of the calculation for the resulting surface tension: (all 5 test liquids were taken into account for the calculation) TABLE 4:

Visible are an increase in the contact angle (less wetting) and a reduction in the surface tension with an increase in the polysiloxane concentration.

Comments on Example 1:

When using 2.5% polyorganosiloxane over material of the same matrix (in this case standard PMMA) an increase of the scratch resistance on the plates from 0.6 to 1 N is recognizable due to the reduced sliding friction. If the scratch resistance of deep-drawn parts is examined, this trend continues in parallel. The values increase from 0.5 N at the unmodified deep drawn part to 0.9 N at polyorganosiloxane-modified deep drawn parts.

If one examines the sliding friction on the same test specimens, then one observes the following when using plates with and without modification: While on the unmodified plate If the steel body begins to slide at an angle of 37 ° - 38 °, this effect can already be observed for modified surfaces at 19 ° - 22 °. If deep-drawn parts are used, sliding of the body at 29 ° -30 ° on specimens with polyorganosiloxanes already occurs at 21 ° -23 °.

From the surface tension measurements it can be seen that an increase of the contact angle with the addition of polyorganosiloxane, especially when using organic solvents containing alcoholic groups, can be observed. This especially for ethylene glycol, which has a contact angle of 64 ° with the addition of 2.5% polyorganosiloxane in unmodified specimens, a contact angle of 76 ° and 5% at a contact angle of 74 °. It seems that with the addition of 2.5%, a maximum of the effect is achieved.

From Table 4 it can be seen that the surface tension, which is composed of a disperse and a polar part, is changed mainly by reduction of the polar fraction. This is shown by the reduction of the polar content at 0% addition of 6.1 mN / m to 4 mN / m at 2.5% polyorganosiloxane addition and 4.6 mN / m at 5.0% polyorganosiloxane addition. Again, a minimum of the value appears to be reached at about 2.5% polyorganosiloxane addition.

Example 2:

Tested on an ABS plate laminated pressed PMMA films with incorporated polyorganosiloxane.

For comparison purposes, various concentrations of polyorganosiloxanes were incorporated into PMMA. The following concentrations were used: 0.5 percent by weight, 1 percent by weight, 1, 5 percent by weight, 2.5 percent by weight.

The polymer compounds were prepared by means of a compounding unit and the granules were pressed on a press into films having a thickness of about 400 μm. These laminates were laminated in the calender on ABS plates. From the specimens obtained, the sliding friction (Slip property) was measured, as in Example 1. As support surface, a 63 x 63 mm sliding surface made of felt was used. The weight was 504 g. The sliding friction on deep-drawn parts was measured to simulate the deep-drawing process.

Results:

TABLE 5:

Example 3:

A first sanitary plate (plate 1) produced by the process according to the invention, consisting of an ABS / PMMA composite, with a 5% coextruded PMMA top layer and a second sanitary plate (plate 2) produced by the process according to the invention, were tested, Consisting of an ABS / PMMA composite, with a 5% co-extruded HI-PMMA top layer. In each case the specified amount of polyorganosiloxane was incorporated as an additive in the top layer. Was tested on

1. Scratch resistance

2. Sliding friction (Slip property)

3. Soiling behavior

4. contact angle measurement of various chemicals (wettability)

ad. 1. Scratch resistance:

The test was as in Example 1.

Results: TABLE 6:

Measured with the scratch tester, an increase of about 30% was found for the additized samples. This can be understood very well by means of "fingernail test".

The increase is due to an improved surface "slippage" due to the aligned silicone groups, which is important for all applications because of increased surface area

Scratch resistance makes the surface of the composite more resistant.

The efficiency of the additive in terms of soil repellency is shown by the following tests:

2. SLIP (sliding friction) of the surface

3. Soil tests

4. contact angle measurement of various chemicals (wettability) ad. 2. SLIP (sliding friction) of the surface

TABLE 7:

Due to the additive, the sliding friction on the plate drops by about 1/3. In deep-drawn parts, this effect is exacerbated, especially on deep-drawn parts without protective film (sliding friction is reduced by about 2/3). The same test procedure was used as in example 1, 2. sliding friction.

ad. 3. Soiling test

Here was tested according to the stain resistance test in the standard ANSI Z124.1 - 1995 5.2. Here it is checked how well a stain (different substances) can be cleaned. For evaluation, a rating is carried out.

TABLE 8:

The samples were deep-drawn and various substances were tested. The result was that with two substances the additized samples performed better. That is, the samples provided with additive required only water to clean and the non-additized samples required alcohol. That is, cleaning of additized samples was easier than cleaning for non-additized samples. This "easy to clean" effect is due to the hydrophobing of the surface by the siloxane.

This effect can also be represented very well by various pens (for example Staedler Topstar 364), since the recorded line contracts strongly on the additized samples and this is not the case in the case of non-additizing. This certifies a lower wettability of the additized surface. ad. 4. contact angle measurement (wettability)

The specimens used were ABS-PMMA composites with a total thickness of 4 mm with a 5% coextruded HI-PMMA top layer (plate 2) with the stated additions of polyorganosiloxane. The composite bodies were deep-drawn with or without PE protective film (about 1: 1, 5).

Results contact angle:

TABLE 9:

Result of the calculation for the resulting surface tension:

TABLE 10:

Discussion of the results:

Surface tension: A significant difference results from a surface tension reduction of about 1-2 mN / m. Important for the "easy to clean" behavior is a reduction of the surface tension and in particular of the polar portion, where a reduction of 2.4 mN was achieved with the deep-drawn samples without protective film on average (1, 4% and 1, 6% additive) The absolute reduction of the polar content of the samples deep-drawn with protective film amounts to 6.1 mN / m, since these results result from the contact angle measurements There are a certain range of variation, however, where there are influences such as static charge, etc. However, it is noticeable that the samples with a 1, 4% additive addition have a lower polar surface tension.

For use in the process according to the invention or in a composite body according to the invention, polyorganosiloxanes of the following mean average formula are provided:

wherein:

A represents an alkyl group having 1 to 8 carbon atoms,

Z represents an aliphatic group having 1 to 14 carbon atoms,

R at least 3

O O

O- and / or groups

containing aliphatic and / or cycloaliphatic and / or aromatic polyester group having a weight-average molecular weight of 200 to 4000 g / mol without Zerewitinoff hydrogen atoms,

Q represents a group which does not contain Zerewitinoff hydrogen atoms and is free of reactive carbon-carbon multiple bonds, preferably acetoxy, -OR ⁴ (R ⁴ = C _1-18 -alkyl), or Q from the group -O-CO- NH-R ⁵ (R ⁵ = C _1-18 -alkyl) is derived,

m is 3 to 200, preferably 15 to 135, and o + n = 2, where both o and n are not zero. Preferably, o and n each deviate from not more than 0.5, more preferably not more than 0.25, from value 1, and most preferably, o = n = 1. The above examples were carried out with polysiloxanes in which

A is methyl,

Z is alkylene ether, namely - (CH ₂ ) 3 -O- (CH ₂ ) ₂ -,

R [-O-CO- (CH ₂ ) ₅ -] ₂₂ , 9

Q is -O-CO-NH- (CH ₂ ) ₁₇ -CH ₃ and m is 21.8, n and o are each 1.

Here, [-O-CO- (CH ₂ ) ₅ -] is ₂₂ , 9 is 22,9-O-CO- groups in an aliphatic polyester having a molecular weight of about 2660.

In a further advantageous embodiment it is provided that Z is selected from the group consisting of an alkylene group having 1 to 14 carbon atoms, an alkylene ether, alkylene thioether or alkyleneamide group having 2 to 14 carbon atoms and an alkylene-amide group having 2 to 14 carbon atoms.

In a further advantageous embodiment, it is provided that A represents a linear alkyl group having 1 to 4 carbon atoms.

In all the aforementioned embodiments, it may be provided that the mass ratio of polydimethylsiloxane block to polyester block is 1: 1 to 1: 3.

Further advantages and details of the invention will become apparent from the following description of the figures. Showing:

2 shows schematically the layer structure of an embodiment of a composite body according to the invention, which consists of five layers, and FIG. 3 shows in tabular form various possibilities of the compositions of the five layers of the exemplary embodiment according to FIG. 2.

In FIG. 1, the carrier layer S ₃ made of ABS, on which a middle layer S ₂ of PMMA is arranged, can be seen. To improve the properties of the surface 2 of the Composite body 1 is provided as a cover layer S _1, a layer of a polymer compound of impact-modified PMMA and polyorganosiloxane.

FIG. 2 shows an exemplary embodiment of a composite body 1 according to the invention, which consists of five layers S ₁ , S ₂ , S ₃ , S ₄ and S ₅ . Various possibilities of the compositions of the individual layers are shown in FIG.

Claims

claims:

1. A process for producing a composite body, characterized in that - preferably impact-modified - polymethyl methacrylate (PMMA) and an organometallic compound, preferably polyorganosiloxane, together with at least one of the following polymers or mixtures thereof:

Polystyrene (PS), acrylonitrile-butadiene-styrene (ABS), polymethyl methacrylate (PMMA) ₁ impact-modified polymethyl methacrylate (HI-PMMA), acrylonitrile-styrene-acrylic ester (ASA), polycarbonate (PC), blend of polycarbonate and polyethylene glycol (glycol) therephtalate (PC-PET (G)), blend of polycarbonate and polybutylene terephthalate (PC-PBT), blend of acrylonitrile-butadiene-styrene and polycarbonate (ABS-PC), blend of acrylonitrile-styrene-acrylic ester and polycarbonate (ASA-PC), Blend of acrylonitrile-butadiene-styrene and polyamide (ABS-PA); to a composite body (1) having at least one cover layer (S ₁ ) and at least one further layer (S ₃ ) are coextruded or laminated, and that the at least one cover layer (Si) at least substantially from - preferably impact-modified - PMMA and the organometallic compound consists.

2. The method according to claim 1, characterized in that the coextruded or laminated composite body (1) is deep-drawn or heat-edged to form a molded body.

3. The method according to claim 1 or 2, characterized in that at least two, preferably three or five, layers (S ₁₁ S ₂₁ S ₃₁ S ₄₁ S ₅ ) are coextruded or laminated, wherein at least one cover layer (S ₁ ) of PMMA and the organometallic compound is present and at least one of the further layers (S ₂₁ S ₃₁ S ₄₁ S ₅ ) consists of one of the following polymers or mixtures thereof: PS ₁ ABS, PMMA, HI-PMMA, ASA, PC, PC-PET (G) , PC-PBT, ABS-PC, ASA-PC, ABS-PA.

4. The method according to any one of claims 1 to 3, characterized in that both cover layers (S ₁ , S ₅ ) consist of PMMA and the organometallic compound.

5. The method according to any one of claims 1 to 4, characterized in that prior to coextrusion or lamination, a polymer compound of the polymethyl methacrylate (PMMA) and the organometallic compound is prepared.

6. The method according to claim 5, characterized in that the polymer compound is formed by mixing the PMMA and the organometallic compound in the screw of an extruder.

7. The method according to claim 5 or 6, characterized in that the polymer compound of PMMA and the organometallic compound is granulated after its formation and prior to coextrusion or lamination.

8. The method according to any one of claims 1 to 7, characterized in that at least the formed from the PMMA and the organometallic compound (s) layer (s) (S ₁₁ S ₅₎ of the composite body (1) above its glass transition temperature (T _G) is (are) heated.

9. The method according to claim 8, characterized in that the heating of the formed from the PMMA and the organometallic compound layer (s) (S ₁₁ S ₅ ) during deep drawing of the composite body (1).

10. The method according to any one of claims 1 to 9, characterized in that the addition of the organometallic compound to PMMA 0.1 to 5 weight percent, preferably 0.2 to 1, 5 weight percent.

11. Composite body, comprising at least one cover layer and a further layer, in particular produced by a method according to one of claims 1 to 10, characterized in that the further layer (S ₃ ) comprises at least one of the following polymers: PS, ABS, PMMA, HI-PMMA, ASA, PC, PC-PET (G), PC-PBT, ABS-PC, ASA-PC, ABS-PA or mixtures thereof, and the at least one cover layer (S ₁ ) of - preferably impact-modified - PMMA and an organometallic compound - preferably polyorganosiloxane - exists.

12. A composite body according to claim 11, characterized in that a composite body can be produced from it by deep drawing or hot edges.

13. A composite according to claim 11 or 12, characterized in that it comprises at least two, preferably three or five layers (S ₁₁ S ₂₁ S ₃₁ S ₄₁ S ₅ ), wherein at least one cover layer (S ₁ ) of PMMA and the organometallic Compound exists and at least one of the other layers (S ₂ , S ₃ , S ₄ , S ₅ ) of one of the following polymers or mixtures thereof: PS, ABS, PMMA, HI-PMMA, ASA, PC, PC-PET (G), PC-PBT, ABS-PC, ASA-PC, ABS-PA.

14. A composite according to any one of claims 11 to 13, characterized in that both outer layers (S ₁₇ S ₅ ) consist of PMMA and the organometallic compound.

15. A composite according to any one of claims 11 to 14, characterized in that the concentration of the organometallic compound in the at least one cover layer (S ₁₁ S ₅ ) in the region of the surface (s) (2) is greatest.

16. A composite according to claim 11 or 12, characterized in that the total thickness of the composite body (1) is 0.05 to 13 mm and the thickness of the cover layer (S ₁ ) of PMMA and the organometallic compound is 0.01 to 2 mm.

17. A composite body according to any one of claims 11 to 16, characterized in that the total thickness of the composite body (1) is 0.05 to 13 mm and the thickness of the further layer (s) (S ₂₁ S ₃₁ S ₄₁ S ₅ ) in each case between 0.01 to 9 mm.

18. Use of polyorganosiloxanes in a process according to one of claims 1 to 10 or in a composite body according to any one of claims 11 to 17, characterized in that the polyorganosiloxanes have the following mean average formula:

wherein:

A represents an alkyl group having 1 to 8 carbon atoms, Z represents an aliphatic group having 1 to 14 carbon atoms,

R at least 3

O

O and / or O groups

Q represents a group which does not contain Zerewitinoff hydrogen atoms and is free of reactive carbon-carbon multiple bonds, preferably acetoxy, -OR ⁴ (R ⁴ = C _1-18 -alkyl),

m is 3 to 200, preferably 15 to 135, and o + n = 2, where both o and n are not zero.

19. Use of polyorganosiloxanes in a process according to any one of claims 1 to 10 or in a composite body according to any one of claims 11 to 17, characterized in that the polyorganosiloxanes have the following mean average formula:

wherein:

A represents an alkyl group having 1 to 8 carbon atoms,

Z represents an aliphatic group having 1 to 14 carbon atoms, R at least 3

O and / or O C groups

Q is from the group -O-CO-NH-R ⁵ (R ⁵ = C _1-18 -alkyl),

20. Uses of polyorganosiloxanes according to claim 19, characterized in that

A is methyl,

Z is alkylene ether, namely - (CH ₂ ) 3 -O- (CH ₂ ) ₂ -,

R [-O-CO- (CH ₂ ) ₅ -] ₂ 2.9

Q is -O-CO-NH- (CH ₂ ) i 7 -CH ₃ and m is 21, 8.

21. Uses of polyorganosiloxanes according to claim 18 or 19, characterized in that Z is selected from the group consisting of an alkylene group having 1 to 14 carbon atoms, an alkylene ether, alkylene thioether or Alkylenamid- group having 2 to 14 carbon atoms and an alkylene Amide group with 2 to 14 carbon atoms.

22. Uses of polyorganosiloxanes according to claim 21, characterized in that A represents a linear alkyl group having 1 to 4 carbon atoms.

23. Uses of polyorganosiloxanes according to any one of claims 18 to 22, characterized in that the mass ratio of polydimethylsiloxane block to polyester block is 1: 1 to 1: 3.