Glass-filled PAEK molding compound

Abstract

The present invention relates to a molding material comprising polyarylene ether ketone and glass particles, the glass particles being crushed and irregularly shaped.

Description

[Technical Field]

[0001] The present invention relates to a molding material comprising polyarylene ether ketone and glass particles, the glass particles being crushed and irregularly shaped. [Background technology]

[0002] Polyarylene ether ketones (PAEKs) are naturally slightly grey in colour and are therefore less suitable for aesthetic applications. For this reason, certain amounts of dyes (e.g. titanium dioxide to give them a white colour) are added to the raw material, for example by compounding. The material is available in the form of granules for injection moulding or as semi-finished products for machining (extruded solid rods).

[0003] Regarding the use in dentistry, e.g. as a material for bridges, the PEEK currently available on the market is not suitable for use in composite bridges because it sags, in other words it is not sufficiently solidified, i.e. the tensile modulus of the material is insufficient. The tensile modulus of the available variants is approximately 3500 MPa (unfilled) to 4100 MPa (colored material).

[0004] A common material for increasing the tensile modulus of PEEK is fiber, such as carbon or glass fiber, as disclosed in U.S. Patent No. 5,629,499. This has already been commercially adopted in industry. This significantly increases the tensile modulus. However, the drawback is that the material no longer exhibits uniform behavior and becomes anisotropic. While it can absorb a large amount of force in a specific direction (the fiber direction), even a slight change in the angle relative to the fiber direction dramatically reduces the tensile modulus. Another drawback for the medical field is that, although the fiber must be biocompatible, the fiber ends that are not encapsulated in the material may cause irritation to mucous membranes, etc.

[0005] To meet the material requirements for applications such as composite bridges in dentistry, reinforced materials will need to be developed. A tensile modulus of more than 5500 MPa must be targeted. PEEK can, in principle, be reinforced by adding fillers. The added dye particles reinforce the polymer matrix. It is known that strength (expressed as tensile modulus according to EN ISO 527) increases with filler loading. On the other hand, adding fillers decreases the ductility of the material. This means that adding fillers makes the material more brittle and therefore more susceptible to breaking under stress. The tensile modulus can be increased to the desired extent by simply adding titanium dioxide, for example. However, this is not a solution, as the material becomes too brittle. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2006 / 094690 Summary of the Invention [Problem to be solved by the invention]

[0007] The objective is to find a particulate filler or mixture of fillers that not only increases the tensile modulus but also maintains as much ductility as possible of the material. [Means for solving the problem]

[0008] This objective was achieved by using specific glass particles.

[0009] The present invention is a molding material comprising polyarylene ether ketone (PAEK) and two fillers, The content of polyarylene ether ketone (PAEK) is at least 30% by weight, preferably 30% by weight to 80% by weight, more preferably 40% by weight to 70% by weight, and particularly preferably 50% by weight to 60% by weight, based on the total weight of the molding material; One of the fillers has a particle size distribution according to ISO 13320:2009 50 The present invention relates to a molding material comprising glass particles having a particle size of 0.1 μm to 10 μm.

[0010] The present invention further provides a molded article made from the molding material according to the present invention.

[0011] The present invention further provides the use of a shaped body according to the invention as a support element.

[0012] The molding material according to the present invention, the molded body made from the molding material according to the present invention, and the use according to the present invention are described below by way of illustrative examples, without intending the present invention to be limited to these exemplary embodiments. When ranges, general formulas, or groups of compounds are given below, these are intended to include not only the corresponding ranges or groups of compounds explicitly mentioned, but also all subranges and subgroups of compounds obtained by excluding individual values ​​(ranges) or compounds. When references are cited within the context of this specification, the entire contents of these references are intended to form part of the disclosure of the present invention. When percentage values ​​are given below, they are expressed in weight percent unless otherwise specified. In the case of compositions, percentage values ​​are values ​​relative to the entire composition unless otherwise specified. When average values ​​are given below, they are mass averages (weight averages) unless otherwise specified. When measured values ​​are given below, they were measured at a pressure of 101,325 Pa and a temperature of 25° C. unless otherwise specified.

[0013] The scope of protection includes the finished and packaged forms of the product according to the invention that are customary in commerce. If these are not defined in the claims, the product itself is covered, as are any possible crushed forms (e.g., grounds, granules, wires, rods, etc., in crude forms suitable for extrusion).

[0014] An advantage of the molding material according to the invention is that the glass particles are uniformly dispersed in the polymer matrix, and another advantage is that this uniform dispersion is achieved without the addition of dispersing agents.

[0015] The advantage of the moldings according to the invention is that at the same filler content (wt%) the elongation at break and the notched Charpy impact value are higher than molding materials made from prior art fillers (e.g. titanium dioxide or fumed silica) that do not contain glass particles.

[0016] The polyarylene ether ketone (PAEK) is preferably selected from polyether ether ketone (PEEK), polyether ketone (PEK), polyether diphenyl ether ketone (PEDEK), polyether ketone ether ketone ketone (PEKEKK), polyether ketone ketone (PEKK), and mixtures and copolymers thereof. More preferred aromatic polyethers are polyether ether ketone (PEEK), polyether ketone (PEK), polyether diphenyl ether ketone (PEDEK), polyether ketone ether ketone ketone (PEKEKK), polyether ketone ketone (PEKK), and more preferred are polyether ether ketone (PEEK) and polyether diphenyl ether ketone (PEDEK).

[0017] In the case of copolymers, the various units of polyarylene ether ketone (PAEK) exhibit a statistical distribution. The statistical distribution can be a block structure with any number of blocks and any order, or a random distribution. They can have an alternating structure or form a gradient on the polymer chain. In particular, they can also be in any mixed form, in which groups with different distributions can follow each other arbitrarily. Certain embodiments may result in a statistical distribution that is limited by the embodiment. In all regions not affected by such limitations, the statistical distribution remains unchanged. The polyarylene ether ketone (PAEK) more preferably has the following units: *-Ph-CO-Ph-O-Ph-O-* (where Ph is a phenyl radical and the asterisks indicate other components of the polymer chain.) The polyarylene ether ketone (PAEK) even more preferably has units of formula (I).

[0018] [ka] (I)

[0019] A particularly preferred polyarylene ether ketone (PAEK) is polyether ether ketone (PEEK).

[0020] The glass particles are solid, crushed, and irregularly shaped particles. The glass is preferably an inorganic glass containing silicates, borates, and aluminates as crosslinking units. In product specifications, silicates are identified and converted as SiO2, borates as B2O3, and aluminates as Al2O3. More preferably, silicates constitute the majority of the crosslinking units. This type of glass is known to those skilled in the art as aluminoborosilicate glass. More preferably, the SiO2 content is 35% by weight or more, more preferably 45% by weight or more, and particularly preferably 50% by weight or more, based on the total mass of the glass. The SiO2 content is preferably 95% by weight or less, 85% by weight or less, 80% by weight or less, and particularly preferably 75% by weight or less. Preferably, the content of phosphate-based crosslinking units (identified and converted as P2O5) is less than 5% by weight, preferably less than 2% by weight, based on the glass content. In particular, the glass is completely phosphate-free.

[0021] Particularly preferred are glasses comprising: 35% to 85% by weight, 40% to 75% by weight, preferably 45% to 55% by weight of SiO2, - 5% to 20% by weight, preferably 9% to 16% by weight, of B2O3, - 0.5% to 20% by weight, 1% to 19% by weight, 5% to 18% by weight, preferably 9% to 16% by weight of Al2O3, - 0% to 10% by weight of K2O, and - up to 40% by weight, preferably 5% to 30% by weight, in particular 10% to 20% by weight, of at least one metal oxide. The percentages are based on the total mass of the glass. The content of impurities such as lead, cadmium, mercury, and hexavalent chromium compounds is 100 ppm or less and is negligible. These metal oxides can give the glass a certain opacity to X-rays. Suitable metal oxides may be selected from BaO, SrO, Cs2O, and SnO2.

[0022] The glass contains SiO2 as a glass-forming component in a proportion of 35% to 85% by weight. In an advantageous embodiment, the upper limit of SiO2 can be set at 73% by weight, preferably 70% by weight, more preferably 68.5% by weight. The lower limit according to the invention is 35% by weight. A low content can have a negative effect on chemical resistance.

[0023] The impurities generally do not exceed 0.2% by weight, in particular 0.1% by weight. This includes, of course, the complete absence of each component. Thus, "free of component" means that the component is essentially absent from the glass, i.e., the component is present in the glass at most as an impurity, but is not added to the glass composition as an individual component.

[0024] Contamination of the glass by unwanted materials should generally not exceed 300 ppm for Fe2O3, preferably not more than 100 ppm, 30 ppm for PbO, 20 ppm for As2O3, 20 ppm for Sb2O3, and 100 ppm for other impurities.

[0025] The glass according to the present invention is expected to be free of CeO2 and TiO2, if necessary, except as impurities. CeO2 and TiO2, due to their absorbance in the UV range, can shift the UV edge of the glass and result in an undesirable yellowish color. In a preferred embodiment, the glass according to the present invention is free of TiO2. Particularly preferred embodiments of the glass are free of TiO2 and ZrO2.

[0026] Of course, for optical or other technical applications, it is also possible to adjust the color appearance of the glass by adding oxides customary for this purpose. Oxides suitable for coloring glass are known to those skilled in the art. Examples are CuO and CoO, which may be added for such purposes preferably in a content of more than 0% by weight and up to 0.5% by weight.

[0027] Furthermore, the addition of Ag2O, for example, in a content greater than 0 wt% and not greater than 3 wt%, can impart a bactericidal effect to the glass. To completely melt the glass, alkali metal oxides from the group Li2O, Na2O, and K2O may be necessary. K2O is used to adjust the melting temperature and simultaneously strengthen the glass network. Therefore, according to the present invention, it is present in the glass composition in a proportion of 0 wt% to 10 wt%. The range is preferably 0 wt% to 7 wt%, more preferably 0 wt% to 5 wt%. Since the presence of alkali oxides reduces chemical resistance, the upper limit of 10 wt% according to the present invention should not be exceeded. An upper limit of 7 wt%, preferably 5 wt%, and more preferably 4 wt% can also be advantageously selected.

[0028] The small size of sodium and lithium ions means that they can more easily leach from the glass matrix, potentially reducing chemical resistance, especially hydrolysis resistance. Preferably, the total content of the oxides K2O, Na2O, and Li2O is 6 wt. % or less, preferably 5 wt. % or less, more preferably 4 wt. % or less. In an advantageous embodiment of the invention, the glass does not contain Li2O, except at most as an impurity. In an even more preferred embodiment, the glass does not contain Na2O or Li2O.

[0029] The glass particles are preferably solid. In the context of this specification, "solid" means that, in addition to glass, the particles contain no more than 10% by volume, preferably no more than 5% by volume, more preferably no more than 2% by volume, and particularly preferably no more than 1% by volume of gaseous inclusions, and particularly preferably contain nothing other than glass. The term "solid" preferably excludes hollow bodies such as hollow glass beads or hollow glass bubbles.

[0030] The glass particles are preferably crushed. "Crushed" in the context of this specification means that the particles are a product (e.g., preferably a ground product) obtained from a crushing process. The glass particles are preferably irregularly shaped. The particles are preferably not so-called spherical particles, such as spheres or ellipsoids. The particles are also preferably not fibrous material. More preferably, the glass particles are solid, crushed, and irregularly shaped.

[0031] The glass preferably has a refractive index of 1.48 to 1.56, which is measured by known methods, preferably on an unground body.

[0032] So-called dental glasses are particularly preferred.

[0033] The molding material according to the present invention preferably contains no more than 5% by weight, no more than 3% by weight, no more than 2% by weight, no more than 1% by weight, or particularly preferably no glass particles of any shape not conforming to the specifications described herein. All weight percentages specified for glass are in each case relative to the glass content.

[0034] In a preferred embodiment, the surface of the glass powder, i.e., the surface of the glass powder particles, is silanized using conventional methods, which can improve the bonding of the inorganic filler to the plastic matrix.

[0035] Glass particle size distribution according to ISO 13320:2009 50 is 0.1 μm to 10 μm, preferably 0.4 to 2 μm, particularly 0.5 to 1.2 μm.

[0036] The glass particles preferably do not contain particles with a particle size of more than 50 μm, more preferably more than 40 μm, even more preferably more than 30 μm, particularly preferably more than 20 μm, very particularly preferably more than 15 μm, and particularly preferably more than 10 μm. 99 The value is preferably d 50 This is less than four times the value.

[0037] The molding material according to the present invention preferably contains 10 to 50% by weight of glass particles relative to the entire molding material.

[0038] The molding material according to the present invention preferably further contains a filler in an amount of 10 to 60% by weight, more preferably 20 to 55% by weight, 30 to 50% by weight, or 40 to 45% by weight, based on the total weight of the molding material. Preferred fillers are TiO2 and BaSO4. These additional fillers do not contain any particles smaller than 100 nm, as they constitute dyes. Particle size distribution measurements are carried out according to ISO 13320 using dry dispersion particles. Particle size is preferably measured according to ISO 13320 using a Malvern Mastersizer 3000 in a dry air stream.

[0039] The molding material according to the present invention preferably contains glass particles in an amount of 50% by weight or more, preferably 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, and more preferably 75% by weight or more, based on the total mass of the filler.

[0040] The matrix of the molding material according to the present invention, i.e., the proportion of the molding material minus the filler, is such that polyaryletherketone (PAEK) accounts for 80% by weight to 100% by weight, preferably 85% by weight to 99% by weight, more preferably 90% by weight to 95% by weight, and particularly preferably 90% by weight to 92% by weight of the total mass of the polymer matrix. In addition to the polyarylene ether ketone (PAEK), the matrix may contain the following further components: For polymer matrices, - 0% to 5% by weight, preferably 0.1% to 4% by weight, of an X-ray contrast agent (excluding the filler BaSO4), - 0% to 10% by weight, preferably 0.1% to 5% by weight, more preferably 0.2% to 3% by weight, in particular 0.3% to 1% by weight of dye (excluding filler TiO2), - 0% to 5% by weight, preferably 0.1% to 2% by weight, of an impact modifier, - 0% to 10% by weight of other polymers, - 0% to 10% by weight of other additives.

[0041] The other polymer is preferably not polyphenylsulfone (PPSU), polysulfone (PSU), fluoropolymer, polyamide (PA), polyacrylate (e.g., polymethyl methacrylate (PMMA)), polyester, polyurethane, polyoxymethylene (POM), or acetal polymer.

[0042] More preferably, the molding material according to the present invention does not include polyphenylsulfone (PPSU), polysulfone (PSU), fluoropolymers, polyamide (PA), polyacrylate (e.g., polymethyl methacrylate (PMMA)), polyester, polyurethane, polyoxymethylene (POM), and acetal polymers.

[0043] X-ray contrast agents can be any substance approved for human and animal use and that produces a corresponding shade in an X-ray image. Preferred substances are barium oxide, strontium sulfate, and / or strontium oxide.

[0044] The dye may be any substance that provides the appropriate color and is approved for human or animal use.

[0045] Preferred colorants are inorganic pigments, preferably metal oxides. Particularly preferred are iron oxides as red pigments and rutile pigments for other colors (e.g., chrome titanium yellow and nickel titanium yellow as yellow pigments). Metal oxides, which have already been claimed as fillers, should not be considered inorganic pigments.

[0046] Furthermore, the molding material according to the present invention does not contain any fibrous material in the entire molding material. The fibrous material is characterized by an aspect ratio of more than 5, preferably more than 3. The aspect ratio is known to those skilled in the art as the ratio of the largest dimension to the smallest dimension. The fibrous material includes glass fibers or carbon fibers, such as so-called carbon nanotubes.

[0047] The molding material according to the present invention preferably contains PEEK, 10 to 60% by weight of a filler relative to the entire molding material, and 50% by weight or more, preferably 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, and more preferably 75% by weight or more of glass particles relative to the total amount of the filler.

[0048] More preferably, the molding material according to the present invention contains PEEK, TiO2 as a filler, and glass particles in an amount of 50% by weight or more, preferably 55% by weight or more, 60% by weight or more, 65% by weight or more, 70% by weight or more, and more preferably 75% by weight or more, based on the total amount of the filler.

[0049] More preferably, the molding material according to the invention comprises PEEK, TiO as filler, and 60% or more by weight of glass particles, the glass of which comprises silicate, borate, and aluminate bridging units (identified and calculated as SiO, BO, and AIIO), preferably with a content of phosphate-based bridging units (identified and calculated as PO) of less than 5% by weight, preferably less than 2% by weight, based on the glass content, and in particular the glass is completely phosphate-free.

[0050] Similarly, the molding material according to the present invention more preferably comprises PEEK, TiO2 as a filler, and 50% by weight or more of glass particles. The glass of the glass particles contains silicate, borate, and aluminate bridging units (identified and converted as SiO2, B2O3, Al2O3), and preferably contains less than 2% by weight of phosphate bridging units (identified and converted as P2O5) based on the glass content. The particle size distribution of the glass particles according to ISO 13320:2009 d 50 is 0.4 to 2 μm, particularly 0.5 to 1.2 μm.

[0051] The molding material according to the present invention particularly preferably comprises PEEK, TiO as a filler, and 50% by weight or more of glass particles. The glass particles contain silicate, borate, and aluminate crosslinking units (identified and calculated as SiO, B, O, and Al, O), preferably with a phosphate crosslinking unit content (identified and calculated as P, O) of less than 2% by weight based on the glass content. In particular, the glass is completely phosphate-free. The molding material is completely fibrous.

[0052] The present invention further provides the use of the inventive molding material for producing a medical device, preferably an implantable artificial bone or dental prosthesis.

[0053] The molding materials according to the invention are preferably produced from the individual components by melt mixing in a kneading unit, i.e. by the use of shear forces.

[0054] The molding material of the present invention may contain further additives. Preferred additives are oxidation stabilizers, UV stabilizers, hydrolysis stabilizers, impact modifiers, pigments, dyes, and / or processing aids.

[0055] In a preferred embodiment, the molding material contains an effective amount of an oxidative stabilizer, more preferably an effective amount of an oxidative stabilizer together with an effective amount of a copper-containing stabilizer. Examples of suitable oxidative stabilizers include aromatic amines, sterically hindered phenols, phosphates, phosphonites, thiosynergists, hydroxylamines, benzofuranone derivatives, acryloyl-modified phenols, and the like. A wide variety of such oxidative stabilizers are commercially available, for example, under the trade names Naugard 445, Irganox 1010, Irganox 1098, Irgafos 168, P-EPQ, or Lowinox DSTDP. Generally, the molding material contains about 0.01% to about 2% by weight of the oxidative stabilizer, preferably about 0.1% to about 1.5% by weight.

[0056] The molding material may also contain a UV stabilizer or a HALS-type light stabilizer. Suitable UV stabilizers are primarily organic UV absorbers, such as benzophenone derivatives, benzotriazole derivatives, oxalanilides, or phenyltriazines. HALS-type light stabilizers are tetramethylpiperidine derivatives. These are inhibitors that act as radical scavengers. UV stabilizers and light stabilizers may be advantageously used in combination. A wide variety of both are commercially available. The manufacturer's instructions regarding dosage may be followed.

[0057] The molding composition may additionally contain hydrolysis stabilizers (eg monomeric, oligomeric or polymeric carbodiimides or bisoxazolines).

[0058] The molding material may further contain an impact modifier. Impact-modifying rubbers for polyamide molding materials are part of the prior art. They contain functional groups derived from unsaturated functional compounds either contained in the main chain polymer or grafted onto the main chain. The most commonly used are EPM or EPDM rubbers free-radical grafted with maleic anhydride. This type of rubber can also be used together with non-functionalized polyolefins, such as isotactic polypropylene, as described in European Patent Publication No. 0683210A2 (U.S. Patent Publication No. 5874176A).

[0059] Examples of suitable processing aids are paraffins, fatty alcohols, fatty acid amides, stearic acid such as calcium stearate, paraffin waxes, montanates, or polysiloxanes.

[0060] The shaped bodies according to the invention are preferably semi-finished products produced by extrusion, these semi-finished products preferably being solid blanks, such as so-called milling blanks, from which shaped pieces, such as prostheses, are subsequently produced by machining.

[0061] Another molded body according to the invention has at least one layer produced from the molding material according to the invention, which layer may be a partial molded body.

[0062] The moldings are preferably produced entirely from the molding material according to the invention.

[0063] Preferably, according to DIN EN 527-2 (2012), the moldings according to the invention have a tensile modulus of more than 5500 MPa.

[0064] More preferably, the moulded bodies according to the invention have a tensile modulus of more than 4300 MPa and an elongation at break of 15% or more according to DIN EN 527-2 (2012) 2012.

[0065] Even more preferably, in accordance with DIN EN 527-2 (2012), the moldings according to the invention have a tensile modulus of more than 4300 MPa, preferably between 4300 and 5300 MPa, and an X value of more than 100, preferably more than 150. The upper limit of the X value may be 500.

[0066] The X-value is the elongation at break (measured in %) according to DIN EN 527-2 (2012) and the Charpy notched impact value (kJ / m 2 It is defined as the value obtained by multiplying the measured value by the

[0067] Particularly preferably, the moldings according to the invention have a tensile modulus of more than 5500 MPa and an X value of more than 30 according to DIN EN 527-2 (2012).

[0068] The molded articles of the present invention are preferably dental prostheses, such as partial or complete dentures, crowns, and bridges. Teeth and bridges may be made from a variety of materials, but are preferably made from one or more molded materials of the present invention that differ in color, etc.

[0069] Mechanical tests are known to those skilled in the art and are preferably carried out in accordance with DIN EN 527-2 (2012). Tests are preferably carried out using so-called dumbbell specimens of type 1BA. Notched impact strength tests are preferably carried out in accordance with ISO 180 or ISO 179. [Example]

[0070] The following components and molding materials were used in the experimental examples: Vestakeep is a trademark of Evonik GmbH (Germany) and refers to molding materials based on polyetheretherketone with or without additives.

[0071] Vestakeep® Dental DC4420 G (a white PEEK molding material used in dentistry), Vestakeep® Dental DC4450 G (a yellow PEEK molding material used in dentistry), and Vestakeep® Dental D4 G were used. Glasses with different compositions and particle sizes were tested. -Glass Type 1 SiO2 approx. 50% by weight SrO approx. 20% by weight B2O3 approx. 15% by weight Al2O3 approx. 15% by weight BaO approx. 1% by weight -Glass Type 2 SiO2 approx. 55% by weight BaO approx. 25% by weight B2O3 approx. 10% by weight Al2O3 approx. 10% by weight

[0072] Glass 1 was used with particle sizes a) = 0.4 μm, b) = 0.8 μm, c) = 1.0 μm, and Glass 2 with particle sizes a) = 0.4 μm, b) = 0.7 μm, c) = 1.0 μm, and d) 3.0 μm. The particle size is d 50 The glass particle size was measured by laser diffraction using a Cilas 1064L according to ISO 13320:2009.

[0073] TiO2 Titanium Dioxide Yellow pigment Chrome Titanium Yellow BaSO4 Barium Sulfate Molding material A with various filler contents

[0074] [Table 1]

[0075] [Table 2]

[0076] Experimental Example 2 Mechanical Test The measured values ​​(according to DIN EN ISO 527-2 (2012)) shown in Table 3 (notched Charpy impact strength, abbreviated as Charpy according to DIN 179) are the arithmetic mean values ​​of 5 molded units (tensile test) and 10 molded units (impact test).

[0077] [Table 3a]

[0078] The results show that dental glass has a beneficial effect on the mechanical properties of the compacts: it hardens the material to a similar extent (tensile modulus) as the TiO2 filler material, but keeps the elongation at break values ​​relatively high.

[0079] [Table 3b]

Claims

1. A molding material comprising polyarylene ether ketone (PAEK) and at least two fillers, The polyarylene ether ketone is contained in an amount of at least 30% by weight based on the total weight of the molding material, One of the fillers has a particle size distribution according to ISO 13320:2009 ５０ and the glass particles have irregular shapes with a diameter of 0.4 μm to 2 μm. The glass of the glass particles is SiO ２ , B ２ O ３ , Al ２ O ３ an inorganic glass consisting of silicate, borate and aluminate bridged units identified and calculated as At least one remaining filler is TiO ２ and is free of particles smaller than 100 nm as measured in accordance with ISO 13320, It does not contain any fiber materials, When forming the molding, the tensile modulus according to DIN EN 527-2 (2012) is 4300 to 5300 MPa and the X value is greater than 100, or the tensile modulus according to DIN EN 527-2 (2012) is greater than 5500 MPa and the X value is greater than 30, Molding material.

2. The glass is (P ２ O ５ 2. The molding material according to claim 1, wherein the content of phosphate-based crosslinking units (specified and calculated as phosphate-based crosslinking units) is less than 5% by weight based on the content in the glass.

3. The glass contains 6% by weight or less of K in total based on the content of the glass. ２ O, Na ２ O, and Li ２ The molding material according to claim 1 or claim 2, further comprising O.

4. 4. The molding material according to claim 1, wherein the glass particles are solid, crushed, and irregularly shaped.

5. The glass particles have a particle size distribution according to ISO 13320:2009 of d ５０ The molding material according to any one of claims 1 to 4, wherein the particle size is 0.5 to 1.2 µm.

6. The molding material according to any one of claims 1 to 5, wherein the molding material contains 10% by weight to 60% by weight of the at least two fillers in total.

7. The molding material according to any one of claims 1 to 6, wherein the glass particles are contained in an amount of 50% by weight or more relative to the total mass of the filler.

8. A molded article made from the molding material according to claim 1.

9. Use of the molded article according to claim 8 as a medical device.

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