Compositions containing copolymers of monomers comprising methyl methacrylate and methacrylic acid, their use and molded articles

Abstract

The present invention relates to a polymer composition suitable for making chemical-resistant molded articles, the composition containing a polymer containing monomers of methyl methacrylate and methacrylic acid; its use; molded articles; and the use of molded articles. In particular, the present invention relates to the use of a polymer composition suitable for making chemical-resistant molded articles for making molded articles, and more particularly, for making solvent-resistant molded articles, the polymer composition containing monomers of methyl methacrylate and methacrylic acid. The present invention also relates to a method for making solvent-resistant molded articles containing a polymer containing monomers of methyl methacrylate and methacrylic acid. The present invention particularly relates to the use of a polymer containing monomers of methyl methacrylate and methacrylic acid for sales terminals and molded articles containing a polymer containing monomers of methyl methacrylate and methacrylic acid for sales terminals.

Description

Technical Field

[0001] The present invention relates to a polymer composition suitable for producing chemically resistant moldings, the composition comprising a polymer of monomers comprising methyl methacrylate and methacrylic acid; its use; moldings; and the use of moldings.

[0002] In particular, the present invention relates to the use of a polymer composition suitable for the manufacture of chemically resistant moldings for the manufacture of moldings, and more particularly for the manufacture of solvent resistant moldings, the polymer composition comprising monomers of methyl methacrylate and methacrylic acid.

[0003] The invention also relates to a process for producing solvent-resistant moldings comprising a polymer comprising monomers of methyl methacrylate and methacrylic acid.

[0004] In particular, the present invention relates to the use of a polymer comprising monomers of methyl methacrylate and methacrylic acid for point-of-sale applications and to molded articles containing a polymer comprising monomers of methyl methacrylate and methacrylic acid for point-of-sale applications.

[0005] Technical issues

[0006] Thermoplastic polymers and copolymers, especially (meth)acrylics, have excellent characteristics such as transparency, mechanical properties and processability, and are widely used in various fields such as automobile parts, electrical components, industrial parts, optical materials, various parts for home appliances, aesthetic parts, groceries, etc.

[0007] Polymer compositions based on (meth)acrylic polymers are of great interest, which have good properties in various fields, or in other words, increased light transmittance, good scratch resistance.

[0008] In addition, polymer compositions with improved chemical resistance, especially solvent resistance, are also of great interest. This can be achieved by adding certain compounds or preparing polymer blends. However, the disadvantage of adding polymer additives or blending several compounds is the loss of other characteristics of the polymer, such as transparency, scratch resistance or clarity.

[0009] An object of the present invention is to provide a (meth)acrylic polymer composition having satisfactory solvent resistance or chemical resistance.

[0010] Another object of the present invention is to provide a (meth)acrylic polymer composition that can be used in solvent resistant applications.

[0011] Still another object of the present invention is to provide a method for producing a molded article comprising a (meth)acrylic polymer composition having satisfactory solvent resistance.

[0012] Another object of the present invention is to provide a (meth)acrylic polymer composition having satisfactory solvent resistance, which contains substantially no other compounds as polymer additives for other polymers.

[0013] Another object of the present invention is to provide a (meth)acrylic polymer composition that can be used for solvent-resistant articles.

[0014] Another object of the present invention is to provide a method for producing a solvent-resistant molding or extrusion comprising a (meth)acrylic polymer.

[0015] Another object of the present invention is to provide an article comprising the (meth)acrylic polymer composition having satisfactory solvent resistance. Background Art

[0016] Document WO2018 / 054999 discloses a polymer (meth)acrylic acid composition comprising a (meth)acrylic acid polymer and a copolymer, which contains at least 41% by weight of a vinyl aromatic monomer, a (meth)acrylate monomer and a dicarboxylic anhydride monomer for increasing chemical resistance.

[0017] The prior art discloses a polymer composition comprising a (meth)acrylic acid copolymer blended with another polymer. None of the prior art polymer compositions comprising monomers of methyl methacrylate and methacrylic acid in the copolymer disclose anything about chemical resistance or use in chemical resistant applications or articles. Summary of the invention

[0018] Surprisingly, it was found that a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50000 g / mol and 300000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight, increases chemical resistance.

[0019] It has also surprisingly been found that a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) containing monomers of methyl methacrylate and methacrylic acid, characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50000 g / mol and 300000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight, can be used to increase chemical resistance. It has also been found that a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) containing monomers of methyl methacrylate and methacrylic acid, characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50000 g / mol and 300000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight, can be used to produce molded articles with increased chemical resistance.

[0020] It has also been found that a molding comprising a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50000 g / mol and 300000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight; possesses increased chemical resistance. DETAILED DESCRIPTION

[0021] According to a first aspect, the present invention relates to a polymer composition (PC1) suitable for producing chemically resistant moldings, said composition containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, said polymer composition being characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50,000 g / mol and 300,000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight.

[0022] According to a second aspect, the present invention relates to the use of a polymer composition (PC1) suitable for the manufacture of a moulding, said composition containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, said polymer composition being characterised in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50 000 g / mol and 300 000 g / mol and the proportion of monomer units from methacrylic acid in said (meth)acrylic copolymer (MP1) is between 4% and 20% by weight in order to increase chemical resistance.

[0023] According to a third aspect, the present invention relates to a molding comprising a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, the polymer composition being characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50,000 g / mol and 300,000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight.

[0024] According to a fourth aspect, the present invention relates to the use of a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid for the production of molded articles with increased chemical resistance, the polymer composition being characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50,000 g / mol and 300,000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight.

[0025] A further aspect of the present invention is a molded article in the form of an assembled display stand made from a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, the polymer composition being characterized in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50,000 g / mol and 300,000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% and 20% by weight.

[0026] Another aspect of the present invention is a method for producing a molded article having increased chemical resistance by converting a polymer composition containing a (meth)acrylic copolymer comprising monomers of methyl methacrylate and methacrylic acid, the method comprising the steps of:

[0027] a) providing a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, characterised in that the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50000 g / mol and 300000 g / mol and the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4 wt % and 20 wt %

[0028] b) Conversion polymer composition (PC1)

[0029] c) Assembly.

[0030] The term "alkyl (meth)acrylate" as used refers to both alkyl acrylates and alkyl methacrylates.

[0031] The term "copolymer" is used to denote a polymer composed of at least two different monomers.

[0032] The term "part(s)" used herein means "part(s) by weight".

[0033] The term "thermoplastic polymer" as used herein refers to a polymer that transforms into a liquid or becomes more liquid or less viscous when heated and that can assume a new shape by the application of heat and pressure.

[0034] The term "PMMA" used in the present invention refers to a copolymer of methyl methacrylate (MMA), and in the case of the copolymer of MMA, the weight ratio of MMA in PMMA is at least 80 weight %.

[0035] The range of x to y mentioned in the present invention is intended to include the upper and lower limits of the range, which is equivalent to at least x and at most y.

[0036] The term "increased chemical resistance" means that the composition of the present invention withstands exposure to chemicals, particularly liquid chemicals, for a longer period of time than a comparative composition.

[0037] The range between x and y mentioned in the present invention does not include the upper limit and the lower limit of the range, which is equivalent to being greater than x and less than y.

[0038] Regarding a polymer composition (PC1) suitable for producing a chemically resistant molded article, the composition contains a (meth)acrylic copolymer (MP1) containing monomers of methyl methacrylate and methacrylic acid. The weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 50000 g / mol and 300000 g / mol, and the proportion of monomer units derived from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4% by weight and 20% by weight.

[0039] In a first preferred embodiment, the polymer composition (PC1) comprises at least 80% by weight of the (meth)acrylic copolymer (MP1). More preferably, the polymer composition (PC1) comprises at least 85% by weight of the (meth)acrylic copolymer (MP1), still more preferably at least 90% by weight of the (meth)acrylic copolymer (MP1), advantageously at least 95% by weight of the (meth)acrylic copolymer (MP1), and most advantageously at least 96% by weight of the (meth)acrylic copolymer (MP1). In a first preferred embodiment, the polymer composition (PC1) comprises from 80% to 100% by weight of the (meth)acrylic copolymer (MP1), preferably from 85% to 100% by weight, still more preferably from 90% to 100% by weight, advantageously from 95% to 100% by weight, and most advantageously from 96% to 100% by weight of the (meth)acrylic copolymer (MP1).

[0040] In a second preferred embodiment, the polymer composition (PC1) is a (meth)acrylic copolymer (MP1).

[0041] In a third preferred embodiment, the polymer composition (PC1) comprises less than 100 wt.% of (meth)acrylic copolymer (MP1). More preferably, the polymer composition (PC1) comprises less than 99.99 wt.% of (meth)acrylic copolymer (MP1), still more preferably less than 99.95 wt.% of (meth)acrylic copolymer (MP1), advantageously less than 99.9 wt.% of (meth)acrylic copolymer (MP1), and most advantageously less than 99.8 wt.% of (meth)acrylic copolymer (MP1).

[0042] In a fourth preferred embodiment, the polymer composition (PC1) comprises less than 100 wt.-% and more than 80 wt.-% of the (meth)acrylic copolymer (MP1), more preferably less than 99.99 wt.-% and more than 85 wt.-%, still more preferably less than 99.95 wt.-% and more than 90 wt.-%, advantageously less than 99.9 wt.-% and more than 96 wt.-%, and most advantageously less than 99.8 wt.-% and more than 99 wt.-%.

[0043] In a fifth preferred embodiment, the polymer composition (PC1) comprises at least 99% by weight of the (meth)acrylic acid copolymer (MP1).

[0044] Preferably, the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 55000 and 260000 g / mol, and more preferably between 57000 and 200000 g / mol, and even more preferably between 60000 and 150000 g / mol.

[0045] In a first advantageous embodiment, the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 70,000 g / mol and 190,000 g / mol, and more advantageously between 80,000 g / mol and 190,000 g / mol.

[0046] In a second advantageous embodiment, the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 60,000 g / mol and 190,000 g / mol, and more advantageously between 60,000 g / mol and 150,000 g / mol.

[0047] In a third advantageous embodiment, the weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) is between 60,000 g / mol and 105,000 g / mol, and more advantageously between 60,000 g / mol and 100,000 g / mol.

[0048] The ratio of the monomer units derived from methacrylic acid in the (meth)acrylic acid copolymer (MP1) is between 4% and 20% by weight, which means that the units may still be present as comonomers in the copolymer, but they do not necessarily have to be present. Part of the methacrylic acid units that have been copolymerized may, for example, be dehydrated, and two adjacent methacrylic acid units may form anhydrides, for example of the glutaric anhydride type.

[0049] Preferably, the proportion of monomer units derived from methacrylic acid in the (meth)acrylic acid copolymer (MP1) is between 4% and 15% by weight.

[0050] In one embodiment, at least 5% of the polymerized methacrylic acid units are converted to anhydride.

[0051] In another embodiment, at least 20% of the polymerized methacrylic acid units are converted to anhydride.

[0052] In yet another embodiment, at least 0.5% of the polymerized methacrylic acid units are converted to anhydride.

[0053] Preferably, between 0.5% and 50% of the polymerized methacrylic acid units in the (meth)acrylic copolymer (MP1) are converted to anhydride, and more preferably between 5% and 50%.

[0054] The (meth)acrylic copolymer (MP1) preferably comprises at least 80% by weight of methyl methacrylate, and more preferably at least 85% by weight of methyl methacrylate. The (meth)acrylic copolymer (MP1) preferably comprises at most 96% by weight of methyl methacrylate, and more preferably at most 95.5% by weight of methyl methacrylate.

[0055] In a first more preferred embodiment, the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 4.5% and 14% by weight.

[0056] In a second more preferred embodiment, the proportion of monomer units from methacrylic acid in the (meth)acrylic acid copolymer (MP1) is between 6% and 14% by weight.

[0057] In a third more preferred embodiment, the proportion of monomer units from methacrylic acid in the (meth)acrylic acid copolymer (MP1) is between 6.5% and 14% by weight.

[0058] In a fourth more preferred embodiment, the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 7% and 14% by weight.

[0059] As mentioned above, the (meth)acrylic acid copolymer (MP1) preferably contains between 4% and 15% by weight of monomer units from methacrylic acid in the (meth)acrylic acid copolymer (MP1). This means that polymerized methacrylic acid no longer necessarily exists as a simple monomer unit in the polymer chain. Two methacrylic acid units may form one anhydride unit. The fraction of anhydride units in the (meth)acrylic acid copolymer (MP1) is between 0 and 15% by weight.

[0060] In a first preferred embodiment, the ratio of anhydride units in the (meth)acrylic copolymer (MP1) is between 0.1% and 14% by weight, more preferably between 0.2% and 12% by weight, and still more preferably between 0.3% and 10% by weight.

[0061] In a second preferred embodiment, the proportion of anhydride units in the (meth)acrylic copolymer (MP1) is between 5% and 14% by weight.

[0062] In a third preferred embodiment, the proportion of anhydride units in the (meth)acrylic copolymer (MP1) is between 0.5% and 14% by weight.

[0063] According to the present invention, the preferred and advantageous embodiments of the different corresponding features of the (meth)acrylic copolymer (MP1) can be combined in any combination. For example, the preferred weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) can be combined with the preferred ratio of the monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1); or for example, the preferred weight average molecular weight Mw of the (meth)acrylic copolymer (MP1) can be combined with the preferred ratio of the anhydride units in the (meth)acrylic copolymer (MP1) or the contact angle of the (meth)acrylic copolymer (MP1).

[0064] The contact angle of the (meth)acrylic copolymer (MP1) is at least 8°. The contact angle was measured with diethyl phthalate according to the method described in the experimental part.

[0065] In a first preferred embodiment, the contact angle is between 8° and 20°.

[0066] In a second preferred embodiment, the contact angle is between 9° and 20°.

[0067] In a third preferred embodiment, the contact angle is between 9° and 17°.

[0068] According to another aspect, the present invention relates to a process for producing a moulding, said process comprising a step of converting a polymer composition (PC1) suitable for producing a moulding resistant to chemicals.

[0069] The conversion can be carried out by injection molding, extrusion, coextrusion or extrusion / blow molding. Preferably, the conversion is carried out by injection or extrusion and more preferably by injection molding.

[0070] The method for producing a molded article according to the present invention comprises the following steps:

[0071] - Melting of a polymer composition (PC1) comprising a (meth)acrylic acid copolymer (MP1)

[0072] - Injection or extrusion of the molten composition.

[0073] In a first preferred embodiment, the method according to the invention for producing a molding comprises the following steps:

[0074] - Melting of a polymer composition (PC1) comprising a (meth)acrylic acid copolymer (MP1)

[0075] - Inject the molten composition into the mold

[0076] - Applying pressure to the mould at least until the mould is completely filled with the molten composition.

[0077] According to a further aspect, the present invention relates to the use of the composition for producing a moulding.

[0078] The compositions according to the invention can be converted by injection moulding, extrusion, coextrusion or extrusion / blow moulding, for example for the production of parts, shaped elements, sheets or films, or for the production of mouldings or articles.

[0079] According to a further aspect, the present invention relates to a moulding made from the polymer composition (PC1).

[0080] According to a further aspect, the present invention relates to the use of the polymer composition (PC1) in a moulding.

[0081] The moldings of the invention may be in the form of sheets, blocks, films, tubes or shaped elements.

[0082] Examples of molded articles or articles are light guides, lenses, automotive trims, automotive rear and headlight parts, taillights, front covers, light clusters, oven covers, household appliance parts, optical films, decorative films, capstock layers or containers.

[0083] According to a further aspect, the present invention relates to an article comprising or made from the polymer composition (PC1). The article can be manufactured directly or by assembling several mouldings.

[0084] In a first preferred embodiment, the article is a multi-layer structure comprising a fabric layer, a container, and a sales terminal.

[0085] In a second preferred embodiment, the article is a display stand, particularly a cosmetic display stand; a point of purchase display, sign holder, box, stand, rack or showcase; cosmetic packaging.

[0086] [Experimental part]

[0087] [method]

[0088] Molecular weight was measured by size exclusion chromatography (SEC). The column was calibrated with PMMA standards with molecular weights between 402 g / mol and 1,900,000 g / mol. The average molecular weights are expressed in g / mol as number average molecular weight and weight average molecular weight Mn and Mw, respectively. For the measurements, the concentration was 1 g / L.

[0089] As explained in the Examples, the solvent resistance was measured with regard to cleaning solutions.

[0090] The contact angle is measured with a device called DIGIDROP. Liquid diethyl phthalate is used. A drop of 1 μl is placed on the substrate via a syringe and a mobile stage, and the profile of this drop is monitored by recording at least 6 pictures per second. Software that allows automatic extraction of the contact angle is used. Since the drop spreads relatively quickly, only 5 to 6 seconds of measurement are performed, and only the values ​​during the first 4 seconds are evaluated, and the values ​​between 2 and 4 seconds are taken.

[0091] The optical properties of the polymers were measured according to the following methods: The light transmittance was measured according to standard ASTM D1003.

[0092] The Vicat temperature of polymers is measured according to specification ISO 306 method B50.

[0093] [Example]

[0094] This series of examples relates to different (meth)acrylic acid copolymers (MP1) for use in or as polymer compositions (PC1).

[0095] The monomers of the (meth)acrylic acid copolymers are abbreviated as follows:

[0096] MMA-Methyl Methacrylate

[0097] MAA – Methacrylic Acid

[0098] EA – Ethyl Acrylate

[0099] MA – Methyl acrylate

[0100] Table 1 - Composition of the corresponding (meth)acrylic acid copolymer (MP1)

[0101]

[0102] The compositions in Table 1 refer to the monomer units used during the polymerization. As explained previously, methacrylic acid can form anhydrides, so there are glutaric anhydride-type structures in the polymer chain, which come from the anhydride formation of the two initially bonded methacrylic acid units in the polymer chain.

[0103] The test specimens were prepared from the corresponding compositions in the form of sheets having a size of 100 mm*100 mm*3 mm.

[0104] Chemical resistance was tested by spraying 3 times a liquid composition LC1 composed of 70 wt% ethanol, 20% turpentine and 10% ethyl phthalate on the surface of a test sample in the form of a sheet. Whether the sample surface was chemically attacked such as surface dissolution or cracking was evaluated as an indication of chemical resistance. Resistance was evaluated by cleaning the surface of the sheet in a dry state or cleaning the surface of the sheet with the liquid composition LC1 after different exposure times.

[0105] Therefore, the evaluation was performed by creating three levels: 1 = good resistance; 2 = medium resistance, 3 = poor resistance.

[0106] Good resistance means that the surface can be easily cleaned by wiping it with a paper towel without using any cleaning solutions or solvents. The aesthetics of the surface remain unchanged after the test.

[0107] Moderate resistance means that the surface can be cleaned by wiping it, but additional use of cleaning solutions (e.g. solvents, perfumes, alcohol) is required to remove all deposits. Cleaning by wiping with a paper towel alone is not sufficient. The aesthetics of the surface remain unchanged after the test.

[0108] Poor resistance means that the surface of the item is damaged (dissolved and / or cracked), which is irreversible.

[0109] Table 2 - Test results of sheets cleaned with LCl

[0110]

[0111] Table 3 - Test results of dry clean sheets

[0112]

[0113] The samples according to the invention have better chemical resistance.

Claims

1. A polymer composition (PC1) suitable for producing chemically resistant mouldings, the composition containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, the polymer composition being characterised in that the (meth)acrylic copolymer (MP1) has a weight average molecular weight Mw of between 50,000 g / mol and 100,000 g / mol, the proportion of monomer units from methacrylic acid in the (meth)acrylic copolymer (MP1) is between 6.5% by weight and 14% by weight, the polymer composition comprising at least 99% by weight of the (meth)acrylic copolymer (MP1) and the (meth)acrylic copolymer (MP1) comprising at least 80% by weight of methyl methacrylate.

2. The polymer composition (PC1) according to claim 1, characterized in that The weight average molecular weight Mw is between 60,000 g / mol and 100,000 g / mol.

3. The polymer composition (PC1) according to claim 1, characterized in that The weight average molecular weight Mw is between 80,000 g / mol and 100,000 g / mol.

4. The polymer composition (PC1) according to claim 1, characterized in that The (meth)acrylic acid copolymer (MP1) comprises at least 85% by weight of methyl methacrylate.

5. The polymer composition (PC1) according to any one of claims 1 to 3, characterized in that The (meth)acrylic acid copolymer (MP1) contains anhydride units, and the ratio of the anhydride units in the (meth)acrylic acid copolymer (MP1) is between 0.1% by weight and 14% by weight.

6. The polymer composition (PC1) according to any one of claims 1 to 3, characterized in that The (meth)acrylic acid copolymer (MP1) contains anhydride units, and the ratio of the anhydride units in the (meth)acrylic acid copolymer (MP1) is between 0.5% by weight and 14% by weight.

7. The polymer composition (PC1) according to any one of claims 1 to 3, characterized in that The contact angle of the (meth)acrylic acid copolymer (MP1) is at least 8°.

8. The polymer composition (PC1) according to any one of claims 1 to 3, characterized in that The contact angle of the (meth)acrylic acid copolymer (MP1) is between 8° and 20°.

9. A method for producing a molded article by converting a polymer composition (PC1) containing a (meth)acrylic copolymer (MP1) comprising monomers of methyl methacrylate and methacrylic acid, the method comprising the following steps: a) providing a polymer composition (PC1) according to any one of claims 1 to 8 b) Conversion polymer composition (PC1) c) Assembly.

10. The method according to claim 9, characterized in that The polymer composition (PC1) is converted by injection moulding, extrusion, coextrusion or extrusion / blow moulding.

11. The method according to claim 9, characterized in that The method comprises the following steps: - melting the polymer composition (PC1) comprising the (meth)acrylic acid copolymer (MP1) - Injecting or extruding the molten composition.

12. The method according to claim 9, characterized in that The method comprises the following steps: - melting the polymer composition (PC1) comprising the (meth)acrylic acid copolymer (MP1) - injecting the molten composition into a mold - applying pressure to the mould at least until the mould is completely filled with the molten composition.

13. Use of the polymer composition (PC1) according to any one of claims 1 to 8 for producing a molding.

14. Use of a polymer composition (PC1) according to any one of claims 1 to 8 for producing a molding having increased chemical resistance.

15. Use of the polymer composition (PC1) according to any one of claims 1 to 8 for point of sale.

16. A molded article comprising the polymer composition (PC1) according to any one of claims 1 to 8 or obtained by the process according to any one of claims 9 to 12, said molded article being in the form of a sheet, a block, a film, a tube or a shaped element.

17. A molded article comprising a polymer composition (PC1) according to any one of claims 1 to 8 or obtained by a method according to any one of claims 9 to 12, the molded article being selected from a multilayer structure including a facestock layer, a container and a sales terminal.

18. A molded article comprising the polymer composition (PC1) according to any one of claims 1 to 8 or obtained by the process according to any one of claims 9 to 12, said molded article being selected from a display stand; a sign holder, a box, a riser, a shelf or a display case; a cosmetic packaging.

19. The molded article according to claim 18, wherein the display stand is a cosmetic display stand.

20. A moulding in the form of an assembled display stand made from the polymer composition (PC1) according to any one of claims 1 to 8.

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