Polymer mixture and the utilization thereof for injection molded parts

1. A polymer composition consisting essentially of:

a mixture of the following components:

a) a low-molecular-weight (meth)acrylate (co)polymer composed of 50 to 90% by weight of methyl methacrylate, from 10 to 20% by weight of styrene, and from 5 to 15% by weight of maleic anhydride having a solution viscosity in chloroform at 25° C. (ISO 1628—Part 6) of 45 to 55 ml/g,

b) an impact modifier based on crosslinked poly(meth)acrylates,

c) a relatively high-molecular-weight (meth)acrylate (co)polymer composed of 50 to 90% by weight of methyl methacrylate, from 10 to 20% by weight of styrene, and from 5 to 15% by weight of maleic anhydride having a solution viscosity in chloroform at 25° C. (ISO 1628—Part 6) greater than or equal to 65 ml/g, and/or

d) a (meth)acrylate (co)polymer other than a) having a solution viscosity in chloroform at 25° C. (ISO 1628—Part 6) of 50 to 55 ml/g,

where each of the individual components a), b), c) and/or d) may be individual polymers or a mixture of polymers, where the entirety of a), b), c) and/or d) is 100% by weight of the polymer mixture; and

where a test specimen produced from the polymer mixture simultaneously has the following properties:

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

II. a Vicat softening point VSP (ISO 306 B50) of at least 109° C.,

III. an impact strength (ISO 179 2D, flatwise) of at least 17 kJ/m 2 , and

IV. a melt index MVR (ISO 1133, 230° C./3.8 kg) of at least 1.5 cm 3 /10 min.

2. The polymer composition according to claim 1 , wherein the components are present in the following quantitative proportions, their entirety being 100% by weight:

a) from 25 to 75% by weight

b) from 10 to 60% by weight

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

3. The polymer composition according to claim 1 , wherein component b) has a two or three-shell structure.

4. The polymer composition according to claim 1 , wherein 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.

5. The polymer composition according to claim 4 , 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.

6. An object prepared by injection moulding the polymer composition according to claim 1 .

7. A method for producing a molded object, comprising:

injection moulding the polymer composition of claim 1 into the shape of an object which has the following properties:

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

II. a Vicat softening point VSP (ISO 306 B50) of at least 109° C.,

III. an impact strength (ISO 179 2D, flatwise) of at least 17 kJ/m 2 , and

IV. a melt index MVR (ISO 1133, 230° C./3.8 kg) of at least 1.5 cm 3 /10 min.

8. A molded part of a household device, a communication device, or a sport of a hobby device or a bodywork component employed in the construction of automobiles, ships or aircraft, comprising:

a shaped object prepared by injection molding of the polymer composition according to claim 1 .