Antistatic polycarbonate moulding compositions
Polymer compositions containing A) at least one compound selected from the group consisting of polycarbonate, polyester and polyester carbonate, B) optionally one or more optionally rubber-modified vinyl (co)polymers, C) at least one compound selected from the group consisting of polyether amides, polyester amides and polyether ester amides, D) at least one Brönstedt-acidic compound selected from the group consisting of organic fruit acids, inorganic acidic phosphorus compounds and compounds of formula IV wherein R 9 and R 10 independently of one another denote C 1 - to C 9 -alkyl, optionally substituted C 5 - to C 6 -cycloalkyl, C 6 - to C 10 -aryl or C 7 - to C 12 -aralkyl, and Y denotes S or CZ 1 Z 2 , wherein Z 1 and Z 2 independently of one another represent H, C 1 - to C 6 -alkyl, cyclohexenyl or cyclohexyl, and E) optionally further additives have permanent antistatic behavior and have improved heat distortion resistance, low-temperature strength, processing stability, stress cracking resistance and, in particular, hydrolytic stability.
1. A polymer composition comprising
A) at least one compound selected from the group consisting of polycarbonate, polyester and polyester carbonate,
B) optionally at least one or more optionally rubber-modified vinyl (co)polymer,
C) at least one compound selected from the group consisting of polyether amides, polyester amides and polyether ester amides,
D) at least one compound selected from the group consisting of dihydrogen phosphates, wherein alkaline earth ions are used as a cation and monohydrogen phosphates, wherein alkali and/or alkaline earth ion are used as a cation,
and
E) optionally one or more further additives.
2. A composition according to claim 1 , wherein
A) is present in an amount of from 10 to 100 parts by weight, based on the sum of components A and B,
B) is present in an amount of from 0 to 90 parts by weight, based on the sum of components A and B,
C) is present in an amount of from 0.5 to 20 wt. %, based on the total composition,
D) is present in an amount of from 0.001 to 3 wt. %, based on the total composition, and
E) is present in an amount of from 0 to 30 wt. %, based on the total composition, wherein the sum of the wt. % of components A and B in the total composition is calculated as the difference of 100 wt. % minus the sum of the wt. % of components C, D and E, and
wherein total composition is to be understood as meaning the sum of the wt. % of all the components A+B+C+D+E=100 wt. %.
3. A composition according to claim 1 , wherein
A) is present in an amount of from 50 to 70 parts by weight, based on the sum of components A and B,
B) is present in an amount of from 30 to 50 parts by weight, based on the sum of components A and B,
C) is present in an amount of from 2 to 5 wt. %, based on the total composition,
D) is present in an amount of from 0.05 to 0.5 wt. %, based on the total composition, and
E) is present in an amount of from 0.3 to 5 wt. %, based on the total composition, wherein the sum of the wt. % of components A and B in the total composition is calculated as the difference of 100 wt. % minus the sum of the wt. % of components C, D and E, and
wherein total composition is to be understood as meaning the sum of the wt. % of all the components A+B+C+D+E=100 wt. %.
4. A composition according to claim 1 , wherein
A) is present in an amount of from 10 to 100 parts by weight, based on the sum of components A and B,
B) is present in an amount of from 0 to 90 parts by weight, based on the sum of components A and B,
C) is present in an amount of from 0.5 to 20 wt. %, based on the total composition,
D) is present in an amount of from 0.01 to 3 wt. %, based on the total composition, and
E) is present in an amount of from 0 to 30 wt. %, based on the total composition,
wherein the sum of the wt. % of components A and B in the total composition is calculated as the difference of 100 wt. % minus the sum of the wt. % of components C, D and E, and wherein total composition is to be understood as meaning the sum of the wt. % of all the components A+B+C+D+E=100 wt. %.
5. A composition according to claim 1 , wherein
A) is present in an amount of from 10 to 100 parts by weight, based on the sum of components A and B,
B) is present in an amount of from 0 to 90 parts by weight, based on the sum of components A and B,
C) is present in an amount of from 0.5 to 20 wt. %, based on the total composition,
D) is present in an amount of from 0.1 to 3 wt. %, based on the total composition, and
E) is present in an amount of from 0 to 30 wt. %, based on the total composition, and wherein the sum of the wt. % of components A and B in the total composition is calculated as the difference of 100 wt. % minus the sum of the wt. % of components C, D and E, and
wherein total composition is to be understood as meaning the sum of the wt. % of all the components A+B+C+D+E=100 wt. %.
6. A composition according to claim 1 , wherein
A) is present in an amount of from 10 to 100 parts by weight, based on the sum of components A and B,
B) is present in an amount of from 0 to 90 parts by weight, based on the sum of components A and B,
C) is present in an amount of from 0.5 to 20 wt. %, based on the total composition,
D) is present in an amount of from 0.01 to 1 wt. %, based on the total composition, and
E) is present in an amount of from 0 to 30 wt. %, based on the total composition, wherein the sum of the wt. % of components A and B in the total composition is calculated as the difference of 100 wt. % minus the sum of the wt. % of components C, D and E, and
wherein total composition is to be understood as meaning the sum of the wt. % of all the components A+B+C+D+E=100 wt. %.
7. A composition according to claim 1 , wherein component D is monopotassium dihydrogen phosphate.
8. A composition according to claim 1 , wherein the specific electric surface resistance of the composition and components produced therefrom, measured according to IEC 60093, from 10 8 to 10 15 ohms.
9. A composition according to claim 1 , having improved hydrolytic stability characterised by a change in the MVR (ΔMVR), measured according to ISO 1133 at 260° C. with a die load of 5 kg, after storage of the granules for 7 days at 95° C. and 100% atmospheric humidity, of less than 50 ml/10 min.
10. A composition according to claim 1 , wherein component E is present and comprises at least one component selected from the group consisting of flameproofing agents, antidripping agents, lubricants and demoulding agents, nucleating agents, stabilisers, fillers, reinforcing substances colourings and pigments.
11. A composition according to claim 1 , wherein component A is polycarbonate.
12. A composition according to claim 1 , wherein component B is present and comprises acrylonitrile-butadiene-styrene.
13. A composition according to claim 1 , wherein component C is polyether amide.
14. A composition according to claim 1 , wherein component E is present and comprises pentaerythritol tetrastearate or 2,6-di-tert-butyl-4-(octadecanoxycarbonylethyl)phenol.