Thermoplastic moulding composition with water-repellent properties
It was found that water-repellent thermoplastic moulding compositions, which comprise a) from 66 to 72% by weight of one or more styrene-acrylonitrile copolymers as component A, b) from 25 to 35% by weight of one or more polyacrylate rubbers as component B, c) from 1 to 5% by weight of one or more fluorine-containing polymer components C, selected from the group of polyvinyliden-difluoride and polyvinyliden-tetrafluoride, d) from 0.05 to 6% by weight of one or more further additives, which are different from C, as component D, where each of the % by weight values is based on the total weight of components A to D and these give a total of 100% by weight, have good replication properties and lead to highly water-repellent surfaces.
1. A water-repellent thermoplastic moulding composition, which comprises:
a) from 66 to 72% by weight of one or more styrene-acrylonitrile copolymers as component A,
b) from 28 to 33% by weight of one or more polyacrylate rubbers as component B,
c) from 1 to 5% by weight of one or more fluorine-containing polymer components C, selected from the group consisting of polyvinyliden-difluoride and polyvinyliden-tetrafluoride,
d) from 0.05 to 6% by weight of one or more plasticizers, which are different from C, as component D,
where each of the % by weight values is based on the total weight of components A to D and these give a total of 100% by weight.
2. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises:
a) from 66 to 70% by weight of a styrene-acrylonitrile copolymer as component A,
b) from 28 to 33% by weight of one or more polyacrylate rubbers as component B,
c) from 1 to 5% by weight of one or more fluorine-containing polymer component C, selected from the group consisting of polyvinyliden-difluoride and polyvinyliden-tetrafluoride,
d) from 0.5 to 6% by weight of one or more further plasticizers as component D.
3. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises:
a) from 66 to 70% by weight of a styrene-acrylonitrile copolymer as component A,
b) from 28 to 33% by weight of one or more polyacrylate rubbers as component B,
c) from 1 to 4% by weight of one or more fluorine-containing polymer component C, selected from the group consisting of polyvinyliden-difluoride and polyvinyliden-tetrafluoride,
d) from 0.5 to 6% by weight of one or more plasticizers as component D.
4. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises from 0.5 to 6% by weight of dialkyl-adipate as component D.
5. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises at least one polyvinyliden-difluoride having a MFI (230° C./5 kg) from 6 g to 24 g/10 min.
6. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises from 66 to 72% by weight of a styrene-acrylonitrile copolymer as component A, having a viscosity number VN of from 50 to 120 ml/g, made, based on (A), from 64 to 76% by weight of at least one vinyl aromatic monomer, and from 24 to 36% by weight of acrylonitrile.
7. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises from 28 to 33% by weight of one or more polyacrylate rubbers as component B, made by emulsion polymerization from, based on (B), from 70 to 98% by weight of at least one C1-8-alkyl acrylate, and from 1 to 29% by weight of at least one other mono-ethylenically unsaturated monomer and from 1 to 10% by weight of at least one polyfunctional, cross linking monomer.
8. A water-repellent thermoplastic moulding composition according to claim 1 , which comprises from 1 to 4% by weight of polyvinyliden-difluoride as component C and from 0.05 to 6% by weight of an dialkyl-adipate additive as component D.
9. A process for producing a water-repellent thermoplastic moulding composition according to claim 1 , comprising the step of mixing the components:
a) from 66 to 72% by weight of one or more styrene-acrylonitrile copolymers as component A,
b) from 28 to 33% by weight of one or more polyacrylate rubbers as component B,
c) from 1 to 5% by weight of one or more fluorine-containing polymer components C, selected from the group consisting of polyvinyliden-difluoride and polyvinyliden-tetrafluoride, and
d) from 0.05 to 6% by weight of one or more plasticizers, which are different from C, as component D,
where each of the % by weight values is based on the total weight of components A to D and these give a total of 100% by weight.
10. The process according to claim 9 , where in a first step, the components (A), (B), (C), and (D) are mixed by co-extruding, kneading, or roll-milling the components at temperatures of from 180 to 300° C., and in a second step, the granulate obtained in the first step is cooled.
11. A water-repellent moulding produced from a thermoplastic moulding composition according to claim 1 .
12. A method of use of a water-repellent thermoplastic moulding composition, according to claim 1 for producing water-repellent mouldings.
13. A method of use of a water-repellent moulding according to claim 11 for producing automotive parts.
14. A method of use of a water-repellent moulding according to claim 11 for producing parts of devices for health care and diagnostics.