HK1096982B - Polymer mixture and the utilization thereof for injection molded parts - Google Patents

Description

Polymer mixture and use thereof for injection-molded parts

The invention relates to polymer mixtures and to the use thereof for injection-molded parts.

Prior Art

Due to the demand for lower and lower levels of fuel consumption, the automotive industry is striving to further reduce the deadweight of motor vehicles. Although in the past most generally steel components have been used for manufacturing in the exterior of motor vehicles, it is desirable for economic reasons to produce these elements from materials having a lower density, while reducing the manufacturing costs.

The property profile of these moldings is determined by low dead weight and at the same time high weathering resistance, high stiffness, good impact strength, good dimensional stability, in particular even when heated in the temperature range of continuous use, good chemical resistance, such as resistance to cleaning compositions, good scratch resistance and high gloss.

In addition to the disadvantage of the dead weight of the steel sheet, a further disadvantage in the use of such materials is that the mouldings have to be lacquered after production in order to achieve a "class A surface". Steel components are therefore increasingly being replaced by plastic components in order to reduce weight, while at the same time taking into account the desire of motor vehicle designers for greater design freedom in terms of component geometry.

Various thermoplastics have been used in this field to date, such as PC, ASA, ASA/PC, PMMA, and glass fiber filled polymers, such as GF-polyamides. Since the moldings are generally produced by injection molding processes, the use of thermoplastics requires, in addition, a good flowability of the plastic melt in view of the component geometry (long flow paths with small layer thicknesses), so that waste parts are avoided. In order to achieve a substantially free choice of color for the motor vehicle manufacturer, the plastic should additionally have little intrinsic color and at the same time a high transparency.

Although the use of glass-fibre-reinforced plastics leads to moldings having good mechanical properties, here too, like steel, subsequent painting is required to achieve a uniform, glossy class a surface quality.

Polycarbonates have very good toughness in addition to high heat distortion resistance. However, insufficient weather resistance, which leads to yellowing, and low surface hardness also require surface painting here. In addition, insufficient rigidity of the material is also a problem for said applications.

Thermoplastic materials such as ASA, PMMA and blends of ASA with PC have improved weatherability relative to polycarbonate. However, in the case of ASA and ASA/PC, the rigidity and surface hardness of the material are not sufficient to meet the requirements for the component, which results in insufficient scratch resistance.

PMMA is a material with excellent weathering resistance and optical quality, as well as high rigidity, high surface hardness, good heat distortion resistance and good melt flow ability. However, the toughness of PMMA is too low for the application. To compensate for this deficiency, PMMA can be optimized by blending with impact modifiers known in the art. However, the heat distortion resistance and the surface hardness are reduced to such an extent by this modification that even impact-modified PMMA is not satisfactory.

A large number of commercially available molding compositions based on polymethyl methacrylate are known which have good material properties.

Objects and solutions

Many commercially available molding compositions based on polymethyl methacrylate have very satisfactory material properties, but have the disadvantage that the property profile required for producing high-quality injection-molded parts, for example for exterior automotive parts, is not achieved exactly identically in all individual requirements (cf. comparative examples 4 to 9). This has so far severely limited the possibilities of use of these components.

The object of the present invention is therefore to provide a thermoplastic material having a balanced property profile and not having the above-mentioned disadvantages.

This object is achieved by a polymer mixture comprising:

a) low molecular weight (meth) acrylate (co) polymers,

characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is less than or equal to 55ml/g,

b) impact modifiers based on crosslinked poly (meth) acrylates,

c) (meth) acrylate (co) polymers of relatively high molecular weight,

characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is greater than or equal to 65ml/g, and/or

d) Other (meth) acrylate (co) polymers than a),

characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is 50 to 55ml/g,

wherein each of the components a), b), c) and/or d) may individually be a single polymer or a mixture of polymers,

wherein a), b), c) and/or d) add up to 100% by weight,

and wherein the polymer mixture may also contain conventional additives, auxiliaries and/or fillers and

wherein the test pieces produced from the polymer mixture simultaneously have the following properties:

I. a tensile modulus (ISO 527) of at least 2600MPa,

a Vicat softening temperature VET (ISO 306-B50) of at least 109 ℃,

an impact strength (ISO 179-2D, flat mode) of at least 17kJ/m²And are and

melt index MVR (ISO 1133, 230 ℃/3.8kg) of at least 1.5cm³/10min。

Description of the invention

Polymer mixture

The invention provides polymer mixtures comprising components a), b) and c) and/or d). The polymer mixture can thus consist of components a), b) and c) or of components a), b) and d), or of all four components. The individual components a), b), c) and/or d) can be present individually as individual polymers or else as mixtures of correspondingly defined polymers.

Properties of the Polymer mixture

The quantitative ratios of the components a), b) and c) and/or d) are selected such that the test pieces produced from the polymer mixture simultaneously have the following properties:

I. a tensile modulus (ISO 527) of at least 2600MPa, preferably at least 2750MPa, particularly preferably at least 2850 or 3000MPa,

a Vicat softening temperature VET (ISO 306-B50) of at least 109 ℃, preferably at least 110 ℃, in particular at least 112 ℃, such as from 110 to 125 ℃,

impact Strength (ISO 179-2D, planar mode) of at least 17kJ/m²Preferably at least 18, 20, 25 or 30kJ/m²，

Melt index MVR (ISO 1133, 230 ℃/3.8kg) of at least 1.5cm³A/10 min, preferably at least 1.65, 2.0, or 3.0cm³/10min。

The conventional additives, auxiliaries and/or fillers are selected so as to impair the abovementioned property profile as little as possible or at most slightly.

Other properties

In addition, the quantitative ratios of the components a), b) and c) and/or d) can be selected in such a way that the test pieces produced from the polymer mixture also have at least some of the following properties:

inherent color

Transmittance T according to DIN 5033/7_D65At least 50%, preferably at least 55%.

Yellowness index

The yellowness index, which can be determined according to DIN 6167 (illuminant type D65, 10 ℃ for a 3mm layer thickness), should be below 20, preferably below 17.

Chemical resistance

Time to break at the following constant edge fiber elongation (Randfaserehnng) upon wetting the surface with isopropanol

·0.39％：＞1800s

·0.50％：＞700s

Time to break at the following constant edge fiber elongation when wetting a surface with an ethanol/water mixture in a ratio of 70: 30

·0.39％：＞1800s

·0.50％：＞200s

Surface hardness

Taber scratch hardness under the following applied force

0.7N: no detectable surface damage

1.5N: < 2.0 μm, preferably < 1.6 μm

3.0N: < 6 μm, preferably < 5 μm

Surface gloss

R (60 °): greater than 48%, preferably greater than 50%

Quantitative ratio of the components

The components are present in quantitative proportions which add up to 100% by weight.

Component a): 25 to 75% by weight, preferably 40 to 60% by weight, in particular 45 to 55% by weight.

Component b): 10 to 60 wt.%, preferably 10 to 20 wt.%.

Component c) and/or d): 10 to 50 wt.%, preferably 12 to 40 wt.%.

If c) is present in an amount of from 30 to 45% by weight, preferably from 35 to 40% by weight, and d) is preferably absent (cf. example 3), test pieces having very high VET values in the range from 116 to 120 ℃ are obtained.

If both c) and d) are present, preferably in a quantitative proportion of c) of from 10 to 15% by weight and a quantitative proportion of d) of from 15 to 25% by weight (cf. example 2), it is possible to obtain test pieces having high VET values in the range from 114 to 118 ℃ and at the same time high gloss, R (60 °) of from 48 to 50.

If d) is present in an amount of from 30 to 40% by weight, preferably from 33 to 38% by weight, and c) is preferably absent (cf. example 1), it is possible to obtain a light transmittance T to DIN 5033/7 having a VET value in the range from 109 to 113 ℃ and at the same time a low level of intrinsic color_D6560 to 65% of the test pieces.

The polymer mixture may also comprise conventional additives, auxiliaries and/or fillers.

Production of polymer mixtures

The polymer mixture can be produced by dry blending of the components, which can be present as powder, granules or preferably pellets.

The polymer mixture can also be processed to give ready-to-use molding compositions by melting and blending the individual components in the molten state or by melting a dry premix of the individual components. This can be done, for example, in a single or twin screw extruder. The resulting extrudate can then be pelletized. Conventional additives, auxiliaries and/or fillers can be mixed in directly or subsequently added as desired by the end user.

Component a)

Component a) is a low molecular weight (meth) acrylate (co) polymer, characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is less than or equal to 55ml/g, preferably less than or equal to 50ml/g, in particular from 45 to 55 ml/g.

This may correspond to a molecular weight M_w(weight average) 95000g/mol (M)_wDetermined using gel permeation chromatography relative to polymethyl methacrylate as a calibration standard). For example, moleculesThe amount Mw can be determined by gel permeation chromatography or by light scattering (see, for example, H.F. Mark et al, Encyclopedia of Polymer Science and engineering, second edition, Vol.10, p.1 and later, J.Wiley, 1989). Component a) is preferably a copolymer of methyl methacrylate, styrene and maleic anhydride.

For example, a suitable quantitative ratio may be:

from 50 to 90% by weight, preferably from 70 to 80% by weight, of methyl methacrylate,

from 10 to 20% by weight, preferably from 12 to 18% by weight, of styrene and

from 5 to 15% by weight, preferably from 8 to 12% by weight, of maleic anhydride.

The corresponding copolymers can be obtained in a manner known per se by free-radical polymerization. For example, EP-A264590 describes a process for producing molding compositions from monomer mixtures of methyl methacrylate, vinylaromatic compounds, maleic anhydride and, if appropriate, alkyl lower acrylates, in which the polymerization is carried out up to a conversion of 50% in the presence or absence of a non-polymerizable organic solvent and in which the polymerization is continued from a conversion of at least 50% up to a conversion of at least 80% in the presence of an organic solvent at a temperature in the range from 75 to 150 ℃ and the low molecular weight volatile constituents are subsequently evaporated.

JP-A60-147417 describes a process for producing highly heat-resistant polymethacrylate moulding compositions, in which a monomer mixture of methyl methacrylate, maleic anhydride and at least one vinylaromatic compound is fed at a temperature of from 100 to 180 ℃ into a polymerization reactor suitable for solution polymerization or bulk polymerization and polymerized. DE-OS 4440219 describes a further production process.

For example, component a) can be produced in the following manner: to a monomer mixture of, for example, 6355g of methyl methacrylate, 1271g of styrene and 847g of maleic anhydride, 1.9g of tert-butyl perneodecanoate and 0.85g of tert-butyl 3, 5, 5-trimethylhexanoate as polymerization initiators and 19.6g of 2-mercaptoethanol as molecular weight regulator were incorporated, as well as 4.3g of palmitic acid. The resulting mixture can be filled into a polymerization cell and degassed, for example, for 10 minutes. The polymerization can then be carried out in a water bath, for example at 60 ℃ for 6 hours and then at a water bath temperature of 55 ℃ for 30 hours. After about 30 hours, the polymerization mixture reached its maximum temperature at about 126 ℃. After the polymerization cell has been removed from the water bath, the polymer is tempered for about 7 hours in an air oven, for example at 117 ℃ in accordance with component a) in the polymerization cell.

Component b)

Component b) is an impact modifier based on crosslinked poly (meth) acrylates. Component b) preferably has a two-or three-shell structure. Impact modifiers for polymethacrylates are well known. The production and construction of impact-modified polymethacrylate molding compositions is described, for example, in EP-A0113924, EP-A0522351, EP-A0465049, EP-A0683028 and US 3,793,402. For example, a suitable commercially available product is METABLEN ® IR 441 available from Mitsubishi Rayon.

Impact modifier

The polymethacrylate matrix contains 1 to 30 wt.%, preferably 2 to 20 wt.%, particularly preferably 3 to 15 wt.%, in particular 5 to 12 wt.% of impact modifier. These impact modifiers comprise an elastomeric phase composed of crosslinked polymer particles. The impact modifiers are obtained in a manner known per se by bead polymerization or by emulsion polymerization.

In the simplest case, this means crosslinked particles having an average particle size of from 50 to 500. mu.m, preferably from 80 to 120 μm, obtainable by means of a bead polymerization. These are generally composed of at least 40% by weight, preferably from 50 to 70% by weight, of methyl methacrylate,from 20 to 40% by weight, preferably from 25 to 35% by weight, of butyl acrylate and from 0.1 to 2% by weight, preferably from 0.5 to 1% by weight, of crosslinking monomers, such as polyfunctional (meth) acrylates, such as allyl methacrylate, and, if appropriate, further monomers, such as from 0 to 10% by weight, preferably from 0.5 to 5% by weight, of C (meth) acrylic acid₁-C₄Alkyl esters, such as ethyl acrylate or butyl acrylate, preferably methyl acrylate, or other monomers capable of vinyl polymerization, such as styrene.

Preferred impact modifiers are core-shell structures having two, particularly preferably three, layers and polymer particles obtainable by emulsion polymerization (see, for example, EP-A0113924, EP-A0522351, EP-A0465049 and EP-A0683028). Typical particle sizes (diameters) of these emulsion polymerization products are from 100 to 500nm, preferably from 200 to 400 nm.

A three-layer or three-phase structure having one core and two shells can be obtained as follows. The innermost (hard) shell may, for example, consist essentially of methyl methacrylate, a small proportion of a comonomer, such as ethyl acrylate, and a proportion of a cross-linking agent, such as allyl methacrylate. The middle (soft) shell can be composed, for example, of butyl acrylate and, if appropriate, styrene, while the outermost (hard) shell corresponds substantially mostly to the matrix polymer, thus leading to compatibility and good bonding to the matrix. The proportion of polybutyl acrylate in the impact modifier is decisive for the impact resistance and is preferably from 20 to 40% by weight, particularly preferably from 25 to 35% by weight.

Component c)

Component c) is an optional component which may be present alone or together with component d).

Component c) of the monomer composition may correspond to component a). Production can be carried out substantially similarly, except that the polymerization parameters are selected so as to obtain a higher molecular weight polymer. This can be achieved, for example, by reducing the amount of molecular weight regulator used.

Component c) is a relatively high molecular weight (meth) acrylate (co) polymer characterized by a solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) of greater than or equal to 65ml/g, preferably 68 to 75 ml/g.

This may correspond to a molecular weight M_w(weight average) 160000g/mol (M)_wDetermined using gel permeation chromatography relative to polymethyl methacrylate as a calibration standard). For example, the molecular weight Mw can be determined by gel permeation chromatography or by light scattering methods (see, e.g., h.f. mark et al, large encyclopedia of polymer science and engineering, second edition, volume 10, pages 1 and beyond, j.wiley, 1989).

Component c) of the monomer composition may correspond to component a). Component c) is preferably a copolymer of methyl methacrylate, styrene and maleic anhydride.

For example, a suitable quantitative ratio may be:

from 50 to 90% by weight, preferably from 70 to 80% by weight, of methyl methacrylate,

from 10 to 20% by weight, preferably from 12 to 18% by weight, of styrene and

from 5 to 15% by weight, preferably from 8 to 12% by weight, of maleic anhydride.

Component d)

Component d) is an optional component which may be used/applied alone or together with component c).

Component d) is a further (meth) acrylate (co) polymer, different from a), characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is from 50 to 55ml/g, preferably from 52 to 54 ml/g.

This may correspond to a molecular weight Mw (weight average) of 80000 to 200000(g/mol), preferably 100000 to 150000 (g/mol). For example, molecular weight M_wCan be determined by gel permeation chromatography or by light scattering methods (see, e.g., h.f. mark et al, polymer scienceAnd engineering major, second edition, volume 10, page 1 and later, j.wiley, 1989).

Component d) is a homopolymer or copolymer of at least 80% by weight of methyl methacrylate and, if appropriate, up to 20% by weight of other monomers copolymerizable with methyl methacrylate. Component d) comprises from 80 to 100% by weight, preferably from 90 to 99.5% by weight, of free-radically polymerized methyl methacrylate units and, if appropriate, from 0 to 20% by weight, preferably from 0.5 to 10% by weight, of other comonomers capable of free-radical polymerization, such as (meth) acrylic acid-C₁-C₄Alkyl esters, in particular methyl acrylate, ethyl acrylate or butyl acrylate. Average molecular weight M of the matrix_wPreference is given to 90000 to 200000g/mol, in particular 100000 to 150000 g/mol.

Component d) is preferably a copolymer of from 95 to 99.5% by weight of methyl methacrylate and from 0.5 to 5% by weight, preferably from 1 to 4% by weight, of methyl acrylate.

Component d) may have a Vicat softening temperature VET (ISO 306-B50) of at least 107 ℃ and preferably from 108 to 114 ℃. The melt index MVR (ISO 1133, 230 ℃/3.8kg) may, for example, be greater than or equal to 2.5cm³/10min。

Conventional additives, auxiliaries and/or fillers

The polymer mixture may also comprise conventional additives, auxiliaries and/or fillers, such as heat stabilizers, UV absorbers, antioxidants, in a manner known per se.

For the injection molding process, lubricants or mold release agents are particularly important, which can reduce or completely prevent possible adhesion of the polymer mixture to the injection mold.

As auxiliaries, lubricants may therefore be present, selected, for example, from those having less than C₂₀Preferably C₁₆To C₁₈Saturated fatty acids of carbon atoms, or having less than C₂₀Preferably C₁₆To C₁₈Saturated aliphatic alcohols of carbon atoms. Superior foodIt is preferred that a low quantitative proportion of up to 0.25% by weight, such as from 0.05 to 0.2% by weight, based on the polymer mixture, is present.

Suitable are, for example, stearic acid, palmitic acid, technical mixtures of stearic acid and palmitic acid. Other suitable examples are n-hexadecanol, n-octadecanol, and also technical mixtures of n-hexadecanol and n-octadecanol.

One particularly preferred lubricant or mold release agent is stearyl alcohol.

Injection-molded part

The polymer mixtures according to the invention can be used in a manner known per se for producing corresponding injection-molded parts by means of an injection-molding process.

Use of

The polymer mixtures can be used for producing injection-molded parts having the following properties:

I. a tensile modulus (ISO 527) of at least 2600MPa, preferably at least 2750MPa, particularly preferably at least 2850MPa,

a Vicat softening temperature VET (ISO 306-B50) of at least 109 ℃, preferably at least 110 ℃, in particular at least 112 ℃, such as 110 to 118 ℃,

impact Strength (ISO 179-2D, planar mode) of at least 17kJ/m²Preferably 18kJ/m²And are and

melt index MVR (ISO 1133, 230 ℃/3.8kg) of at least 1.5cm³A/10 min, preferably at least 1.65cm³/10min。

The injection-molded parts can be used as parts for household appliances, communication equipment, hobby equipment or sports equipment, or as fuselage parts or components of fuselage parts in the manufacture of automobiles, boats or airplanes. Typical examples of body parts or components of body parts of motor vehicles are, for example, spoilers, shades (Blenden), sunroof assemblies or exterior mirror housings.

Advantageous effects of the invention

The polymer mixtures or molding compositions according to the invention can be used to produce moldings, in particular injection-molded parts, which meet high material requirements, for example those which are present for exterior automotive parts. Four particularly important requirements have been successfully ensured here at the same time in an order of magnitude suitable for processing and use: tensile modulus, vicat softening temperature, impact strength, and melt index. In particular, good flow properties lead to the desired processability in injection molding, even for highly demanding part geometries. Surprisingly, it has now been found that injection-molded parts can be obtained which have both sufficient toughness and high weathering resistance and high temperature resistance. In addition, a number of other desirable properties are also achieved in a fully satisfactory manner, such as chemical resistance, yellowness index and inherent color. The property profile can be individually adjusted to the requirements in a particular case by means of the mixing ratios of the components a) to d).

Examples

Production of component a):

a monomer mixture of 6355g of methyl methacrylate, 1271g of styrene and 847g of maleic anhydride was admixed with 1.9g of tert-butyl perneodecanoate and 0.85g of tert-butyl 3, 5, 5-trimethylhexanoate as polymerization initiator and 19.6g of 2-mercaptoethanol as molecular weight regulator and 4.3g of palmitic acid.

The resulting mixture was filled into a polymerization cell and degassed for 10 minutes. It was then polymerized in a water bath at 60 ℃ for 6 hours and subsequently at a water bath temperature of 55 ℃ for 30 hours. After about 30 hours, the polymerization mixture reached its maximum temperature at 126 ℃. After the polymerization cell had been removed from the water bath, the polymerization product was tempered in the polymerization cell for a further 7 hours at 117 ℃ in an air oven.

The resulting copolymer was clear and almost colorless,and has a solution viscosity of V.N (according to ISO 1628-6, 25 ℃, chloroform) of 48.7 ml/g. The flowability of the copolymer, determined according to ISO1133 at 230 ℃ and 3.8kg, is 3.27cm MVR³/10min。

Component a) is the above-described copolymer formed from 75% by weight of methyl methacrylate, 15% by weight of styrene and 10% by weight of maleic anhydride.

The components b) used are: a commercially available impact modifier METABLEN available from Mitsubishi Rayon corporation^®IR 441。

The component c) used is: a commercially available copolymer formed from 75% by weight of methyl methacrylate, 15% by weight of styrene and 10% by weight of maleic anhydride and having a solution viscosity according to ISO 1628-6(25 ℃, chloroform) of 68 ml/g.

The components d) used are: commercially available copolymers formed from 99 wt.% methyl methacrylate and 1 wt.% methyl acrylate having a solution viscosity (ISO 1628-part 6) in chloroform at 25 ℃ of about 52 to 54 ml/g.

Inventive examples 1 to 3

Example 1:

the polymer mixture consisted of:

component a): 50% by weight

Component b): 15.6% by weight

Component c): -

Component d): 34.4% by weight

Lubricant: 0.1% by weight of n-octadecanol (based on the sum of components a) to d))

Example 2:

the polymer mixture consisted of:

component a): 50% by weight

Component b): 13% by weight

Component c): 15% by weight

Component d): 22% by weight

Example 3:

the polymer mixture consisted of:

component a): 50% by weight

Component b): 13% by weight

Component c): 37% by weight

Component d): -

Comparative examples (comparative examples 4 to 9)

Comparative example 4:

commercially available impact-modified molding compositions having a matrix formed from 99% by weight of methyl methacrylate and 1% by weight of ethyl acrylate comprise 34% by weight of an impact modifier.

Comparative example 5:

a commercially available molding composition was formed from 96% by weight of methyl methacrylate and 4% by weight of methacrylic acid.

Comparative example 6:

commercially available molding compositions formed from 99% by weight of methyl methacrylate and 1% by weight of methyl acrylate, M_WAbout 110000.

Comparative example 7:

commercially available impact-modified molding compositions having a matrix of 99.5% by weight of methyl methacrylate and 0.5% by weight of n-butyl acrylate, M_WAbout 125000(g/mol), 20 wt.% impact modifier in three phases.

Comparative example 8:

commercially available molding compositions formed from 99% by weight of methyl methacrylate and 1% by weight of methyl acrylate, M_WAbout 110000 (different from other manufacturers of comparative example 6)

Comparative example 9:

a commercially available molding composition, formed from 75% by weight of methyl methacrylate, 15% by weight of styrene and 10% by weight of maleic anhydride, had a solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) of 68ml/g (corresponding to component c) in examples 1 to 3).

Performance of	Example 1	Example 2	Example 3	Comparative example 4	Comparative example 5	Comparative example 6	Comparative example 7	Comparative example 8	Comparative example 9
										Tensile modulus [ MPa ]]	2900	3000	3100	1700	3500	3300	2500	3300	3600
VET[℃]	111.5	115.8	118.5	93	121	107	105	108	119
										SZ[kJ/m]	39	28.5	20.6	70	11	20	53	20	20
MVR[cm/10min]	3.5	2.3	1.7	0.8	2	2.8	0.9	3	1.2
										TD65/10°[％]	63	58.5	52	90	92	92	92	92	90
Yellowness index	13.09	14.46	15.87	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
										Chemical resistance isopropyl alcohol (Isoprop.) edge fiber elongation time to break [ s]
0.39％	＞1800	＞1800	＞1800	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
										0.50％	722	1345	＞1800	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
Time to break at elongation of chemical resistant EtOH/Water edge fiber [ s ]]
										0.39％	＞1800	＞1800	＞1800	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
0.50％	210	777	＞1800	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
										Taber scratch hardness [ mu.m ]]
0.7N	0	0	0	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
										1.5N	1.5	1.1	1.2	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
3.0N	4.2	3.5	3.9	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.
										Degree of gloss
R(60°)[％]	43.4	49.1	45.8	n.b.	n.b.	n.b.	n.b.	n.b.	n.b.

n.b. ═ not determined

Claims (13)

1. A polymer mixture comprising the following components:

a) low molecular weight (meth) acrylate (co) polymers,

characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is less than or equal to 55ml/g,

b) impact modifiers based on crosslinked poly (meth) acrylates,

c) (meth) acrylate (co) polymers of relatively high molecular weight,

characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is greater than or equal to 65ml/g, and/or

d) Other (meth) acrylate (co) polymers than a),

characterized in that the solution viscosity in chloroform at 25 ℃ (ISO 1628-part 6) is 50 to 55ml/g,

wherein each of the components a), b), c) and/or d) may refer to a single polymer or to a mixture of polymers,

wherein a), b), c) and/or d) add up to 100% by weight and are present in the following quantitative ratios:

a) from 25 to 75% by weight of a water-soluble polymer,

b) from 10 to 60% by weight of a polymer,

c) and/or d) from 10 to 50% by weight,

and wherein the polymer mixture may also contain conventional additives, auxiliaries and/or fillers and wherein the test pieces produced from the polymer mixture simultaneously have the following properties:

I. a tensile modulus (ISO 527) of at least 2600MPa,

a Vicat softening temperature VET (ISO 306-B50) of at least 109 ℃,

impact Strength (ISO 179-2D, planar mode) of at least 17kJ/m²And are and

melt index MVR (ISO 1133, 230 ℃/3.8kg) of at least 1.5cm³/10min。

2. Polymer mixture according to claim 1, wherein component a) is a copolymer of methyl methacrylate, styrene and maleic anhydride.

3. A polymer mixture according to claim 2, characterized in that component a) is a copolymer formed from:

from 50 to 90% by weight of methyl methacrylate,

10 to 20% by weight of styrene and

5 to 15 wt% maleic anhydride.

4. Polymer mixture according to any one of claims 1 to 3, characterized in that component b) has a two-or three-shelled structure.

5. Polymer mixture according to any one of claims 1 to 3, characterized in that component c) is a copolymer formed from methyl methacrylate, styrene and maleic anhydride.

6. Polymer mixture according to claim 5, wherein component c) is a copolymer formed from:

from 50 to 90% by weight of methyl methacrylate,

10 to 20% by weight of styrene and

5 to 15 wt% maleic anhydride.

7. A polymer mixture as claimed in any of claims 1 to 3, characterized in that component d) is a homopolymer or copolymer of at least 80% by weight of methyl methacrylate and optionally up to 20% by weight of other monomers copolymerizable with methyl methacrylate.

8. A polymer mixture as claimed in claim 7, wherein component d) is a copolymer of from 95 to 99.5% by weight of methyl methacrylate and from 0.5 to 5% by weight of methyl acrylate.

9. Polymer mixture according to any one of claims 1 to 3, characterized in that a lubricant is present as an auxiliary.

10. Polymer mixture according to claim 9, characterized in that it contains stearyl alcohol as mould release agent.

11. Injection molded part consisting of a polymer mixture according to any of claims 1 to 10.

12. Use of a polymer mixture according to any one of claims 1 to 10 for producing injection moldings having the following properties:

I. a tensile modulus (ISO 527) of at least 2600MPa,

a Vicat softening temperature VET (ISO 306-B50) of at least 109 ℃,

impact Strength (ISO 179-2D, planar mode) of at least 17kJ/m²And are and

melt index MVR (ISO 1133, 230 ℃/3.8kg) of at least 1.5cm³/10min。

13. Use of the injection-molded parts according to claim 11 as parts for household appliances, communication equipment, hobby equipment or sports equipment, or as fuselage parts or components of fuselage parts in the manufacture of automobiles, boats or aircraft.