Polycarbonate composition

Abstract

The present invention relates to a polycarbonate composition and the process for the production thereof and molded articles. The polycarbonate composition provided in the present invention comprises A) 8-70 wt. % of a polycarbonate component, B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer component, C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X) and D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene, with the above weight percentages based on said polycarbonate composition as 100 wt. %. The polycarbonate composition provided in the present invention has a high flame-retardant level, an excellent low-temperature impact-resistant property and good heat resistance, and is suitable for the use requirement of casings for electrical devices which have relatively high flame-retardant levels (such as UL94 5VB) and require an excellent low-temperature impact-resistant property.

Claims

1. A polycarbonate composition, comprising A) 8-70 wt. % of a polycarbonate component, B) 40-90 wt. % of a polysiloxane-polycarbonate copolymer component, wherein the siloxane blocks of the polysiloxane-polycarbonate copolymer are derived from the corresponding dihydroxy polysiloxane (I): ##STR00020## wherein, in this formula (I), R1 independently represents hydrogen atom, halogen atom, hydroxy group, alkyl group having 1 to 20 carbon atoms, alkoxy or aryl group; R2 independently represents hydrocarbon group having 1 to 13 carbon atoms or hydroxy group; R3 independently represents alkylene group having 2 to 8 carbon atoms; m independently represents an integer of 0 to 4; n independently represents an integer of 1 to 200; A represents a structure of the following chemical formula (II): ##STR00021## X represents polynuclear arylene group which has 6 to 30 carbon atoms and is unsubstituted or substituted with halogen atom, alkyl group, alkoxy group, aryl group or carboxy group, C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X) ##STR00022## wherein, k represents 1 or an integer from 1 to 10, having a trimer content (k=1) of from 60 to 98 mol %, based on component C, and wherein, R is in each case identical or different and represents an amine group; C.sub.1- to C.sub.8-alkyl, each optionally halogenated; C.sub.1- to C.sub.8-alkoxy; C.sub.5- to C.sub.6-cycloalkyl, each optionally substituted by alkyl, and/or by halogen; C.sub.6- to C.sub.20-aryloxy, each optionally substituted by alkyl, and/or by halogen, and/or by hydroxy; C.sub.7- to C.sub.12-aralkyl, each optionally substituted by alkyl, and/or by halogen; or a halogen group; or an OH group, and D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene, with the above weight percentages based on said polycarbonate composition as 100 wt. %.

2. The polycarbonate composition according to claim 1, wherein, said polysiloxane-polycarbonate copolymer comprises 4-10 wt. % of siloxane units, based on said polysiloxane-polycarbonate copolymer as 100 wt. %.

3. The polycarbonate composition according to claim 1, wherein, the content of said trimer (k=1) is 65 to 95 mol % based on component C.

4. The polycarbonate composition according to claim 3, wherein, the content of said trimer (k=1) is 65-85 mol %, the content of said tetramers (k=2) is from 10 to 20 mol %, the content of the higher oligophosphazenes (k=3, 4, 5, 6 and 7) is from 5 to 15 mol %, and the content of the phosphazene-oligomers with k≥8 is from 0 to 1 mol %, each based on component C.

5. The polycarbonate composition according to claim 1, wherein, said cyclic phosphazene is one or more selected from the group consisting of propoxyphosphazene, phenoxyphosphazene, methylphenoxyphosphazene, aminophosphazene and fluoroalkylphosphazene.

6. The polycarbonate composition according to claim 1, wherein, said methyl methacrylate-butadiene-styrene has butadiene or butadiene-styrene copolymer as the rubber phase, of which the weight percent is 60-85 wt. %, based on said methyl methacrylate-butadiene-styrene as 100 wt. %.

7. The polycarbonate composition according to claim 1, wherein, said methyl methacrylate-butadiene-styrene has PMMA or PMMA-styrene copolymer as the graft layer.

8. The polycarbonate composition according to claim 1, further comprising a component E) 0.05-1 wt. % of an anti-dripping agent, based on said polycarbonate composition as 100 wt. %.

9. The polycarbonate composition according to claim 1, further comprising lubricants, demolding agents, nucleating agents, stabilizers, antistatic agents, dyes, pigments, fillers, or reinforcing agents.

10. A method comprising utilizing the polycarbonate composition according to claim 1 in the preparation of injection- or thermo-formed molded articles.

11. Molded articles, prepared from the polycarbonate composition according to claim 1.

12. A process for the preparation of a polycarbonate composition, comprising the following steps: mixing components for the preparation of said polycarbonate composition, said components including: A) 8-70 wt. % of a polycarbonate component, B) 40-90 wt. % of a polysiloxane-polycarbonate copolymer component, wherein the siloxane blocks of the polysiloxane-polycarbonate copolymer are derived from the corresponding dihydroxy polysiloxane (I): ##STR00023## wherein, in this formula (I), R1 independently represents hydrogen atom, halogen atom, hydroxy group, alkyl group having 1 to 20 carbon atoms, alkoxy or aryl group; R2 independently represents hydrocarbon group having 1 to 13 carbon atoms or hydroxy group; R3 independently represents alkylene group having 2 to 8 carbon atoms; m independently represents an integer of 0 to 4; n independently represents an integer of 1 to 200; A represents a structure of the following chemical formula (II): ##STR00024## X represents polynuclear arylene group which has 6 to 30 carbon atoms and is unsubstituted or substituted with halogen atom, alkyl group, alkoxy group, aryl group or carboxy group, C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X) ##STR00025## wherein, k represents 1 or an integer from 1 to 10, having a trimer content (k=1) of from 60 to 98 mol %, based on component C, and wherein R is in each case identical or different and represents an amine group; C.sub.1- to C.sub.8-alkyl, each optionally halogenated; C.sub.1- to C.sub.8-alkoxy; C.sub.5- to C.sub.6-cycloalkyl, each optionally substituted by alkyl, and/or by halogen; C.sub.6- to C.sub.20-aryloxy, each optionally substituted by alkyl, and/or by halogen, and/or by hydroxy; C.sub.7- to C.sub.12-aralkyl, each optionally substituted by alkyl, and/or by halogen; or a halogen group; or an OH group, and D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene, with the above weight percentages based on said polycarbonate composition as 100 wt. %.

13. A polycarbonate composition, consisting of: A) 8-70 wt. % of a polycarbonate component, B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer component, C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X) ##STR00026## wherein, k represents 1 or an integer from 1 to 10, having a trimer content (k=1) of from 60 to 98 mol %, based on component C, and wherein, R is in each case identical or different and represents an amine group; C.sub.1- to C.sub.8-alkyl, each optionally halogenated; C.sub.1- to C.sub.8-alkoxy; C.sub.5- to C.sub.6-cycloalkyl, each optionally substituted by alkyl, and/or by halogen; C.sub.6- to C.sub.20-aryloxy, each optionally substituted by alkyl, and/or by halogen, and/or by hydroxy; C.sub.7- to C.sub.12-aralkyl, each optionally substituted by alkyl, and/or by halogen; or a halogen group; or an OH group, and D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene, optionally, E) 0.05-1 wt. % of an anti-dripping agent, based on said polycarbonate composition as 100 wt. %, and optionally lubricants, demolding agents, nucleating agents, stabilizers, antistatic agents, dyes, pigments, fillers and reinforcing agents, with the above weight percentages based on said polycarbonate composition as 100 wt. %.

14. The polycarbonate composition according to claim 13, wherein the siloxane blocks of the polysiloxane-polycarbonate copolymer are derived from the corresponding dihydroxy polysiloxane (I): ##STR00027## wherein, in this formula (I), R1 independently represents hydrogen atom, halogen atom, hydroxy group, alkyl group having 1 to 20 carbon atoms, alkoxy or aryl group; R2 independently represents hydrocarbon group having 1 to 13 carbon atoms or hydroxy group; R3 independently represents alkylene group having 2 to 8 carbon atoms; m independently represents an integer of 0 to 4; n independently represents an integer of 1 to 200; A represents a structure of the following chemical formula (II): ##STR00028## X represents polynuclear arylene group which has 6 to 30 carbon atoms and is unsubstituted or substituted with halogen atom, alkyl group, alkoxy group, aryl group or carboxy group.

15. A method comprising utilizing the polycarbonate composition according to claim 13 in the preparation of injection- or thermo-formed molded articles.

16. Molded articles, prepared from the polycarbonate composition according to claim 13.

17. A process for the preparation of a polycarbonate composition, comprising the following steps: mixing components for the preparation of said polycarbonate composition, said components consisting of: A) 8-70 wt. % of a polycarbonate component, B) 25-90 wt. % of a polysiloxane-polycarbonate copolymer component, C) a flame retardant component, which comprises 0.5-6 wt. % of a cyclic phosphazene of formula (X) ##STR00029## wherein, k represents 1 or an integer from 1 to 10, having a trimer content (k=1) of from 60 to 98 mol %, based on component C, and wherein, R is in each case identical or different and represents an amine group; C.sub.1- to C.sub.8-alkyl, each optionally halogenated; C.sub.1- to C.sub.8-alkoxy; C.sub.5- to C.sub.6-cycloalkyl, each optionally substituted by alkyl, and/or by halogen; C.sub.6- to C.sub.20-aryloxy, each optionally substituted by alkyl, and/or by halogen, and/or by hydroxy; C.sub.7- to C.sub.12-aralkyl, each optionally substituted by alkyl, and/or by halogen; or a halogen group; or an OH group, and D) an impact modifier component, which comprises 0.5-6 wt. % of methyl methacrylate-butadiene-styrene, optionally, E) 0.05-1 wt. % of an anti-dripping agent, based on said polycarbonate composition as 100 wt. %, and optionally lubricants, demolding agents, nucleating agents, stabilizers, antistatic agents, dyes, pigments, fillers and reinforcing agents, with the above weight percentages based on said polycarbonate composition as 100 wt. %.

Description

EXAMPLES

(1) The following Examples aim at exemplifying rather than limiting.

(2) Components used in Examples and the brief introduction thereof are as follows:

(3) TABLE-US-00001 Names Description Suppliers M.2800 BPA type polycarbonate, with a Covestro Co., Ltd. weight average molecular weight of about 28,000 g/mol M.2600 BPA type polycarbonate, with a Covestro Co., Ltd. weight average molecular weight of about 26,000 g/mol M.2400 BPA type polycarbonate, with a Covestro Co., Ltd. weight average molecular weight of about 24,000 g/mol polysiloxane-polycarbonate polysiloxane-polycarbonate Samyang copolymer Trirex ST6- copolymer, with a siloxane 3022PJ(1) content of 9% FS200 (PTFE MB) anti-dripping agent, SAN coated Han Nano tech Co., Ltd PTFE Phosphazene Rabitle FP-110 Phenoxyphosphazene of formula Fushimi Pharmaceutical (XI) having a content of Co., Ltd. oligomers with k = 1 of 70 mol %, a content of oligomers with k = 2 of 18 mol % and a content of oligomers with k ≥ 3 of 12 mol %. (XI) AKD STAB FP-800 phosphate flame retardant ADEKA Corporation Kane ACE M732 methyl methacrylate-butadiene- KANEKA Corporation styrene impact modifier Paraloid EXL2300 acrylate impact modifier Dow Chemicals Paraloid EXL2311 acrylate impact modifier Dow Chemicals Paraloid EXL2313 acrylate impact modifier Dow Chemicals

(4) In comparative Examples and inventive Examples, unless particularly explained, the amount in percent of each component refers to the weight percent of the component relative to the resulting polycarbonate composition, with polycarbonate composition as 100 wt. %.

(5) The polycarbonate combination in the comparative Examples and the inventive Examples in the present invention were prepared by the following process: 1) premixing an impact modifier, a flame retardant and other additives for about 2 minutes by a high-speed mixer (Reimelt Henschel mixer, model No. FML40) to obtain a premix; 2) mixing the premix with other components, such as a polycarbonate component, a polysiloxane-polycarbonate copolymer component in a twin-screw extruder (apparatus and model No. Coperion ZSK26) and granulating by extrusion so as to obtain granules.

(6) Produce test samples corresponding to the resulting polycarbonate composition granules according to the requirements of the test standards in Tables 1-4, and conduct the corresponding tests according to the corresponding test standards.

(7) The weight average molecular weights of the polycarbonates used in the examples were measured by GPC (gel permeation chromatography) with polycarbonate standard.

Comparative Examples 1-7

(8) Table 1 lists comparative Examples 1-7. In the comparative Examples listed in Table 1, phosphazene (FR-110) serves as the major flame retardant in the polycarbonate composition.

(9) As shown in Table 1, with the increase of the addition amount of phosphazene from 2.5 wt. % to 4.5 wt % from comparative Example 1 to comparative Example 3, though the Vicat softening temperature of the polycarbonate compositions was maintained at a relatively high temperature (not lower than 134° C.), the flame-retardant level increased from V1 (test conditions: 1.0 mm, 2 days, 23° C.) to V0 (test conditions: 1.0 mm, 2 days, 23° C.). However, the flame-retardant level still failed to reach the requirement of UL94 5VB (test conditions: 2.0 mm, 2 days, 23° C.). Meanwhile, at low temperatures between −20° C. and −40° C., the notched impact strength was between 8.1 and 9.3 kJ/m.sup.2, showing that the polycarbonate compositions exhibited brittleness, and the notched impact strength was not satisfying.

(10) In comparative Examples 4-5, the addition amount of phosphazene was maintained at 2.5 wt. %, and 1 wt. % and 2 wt. % of methyl methacrylate-butadiene-styrene impact modifier Kane Ace M732 were added respectively to increase the impact strength, with the weight percent based on the polycarbonate composition as 100 wt. %. As shown in Table 1, though the polycarbonate compositions in comparative Examples 4-5 passed UL94 5VB standard, the flame-retardant property decreased from V1 (test conditions: 1.0 mm, 2 days, 23° C.) to V2 (test conditions: 1.0 mm, 2 days, 23° C.), and at low temperatures between −20° C. and −40° C., the notched impact strength increased but was not improved significantly, and only reached 12-16 kJ/m.sup.2.

(11) In comparative Examples 6-7, 40 wt. % of a polysiloxane-polycarbonate copolymer (ST6-3022PJ(1)) was added to increase the notched impact strength at low temperatures, with the weight percent based on the polycarbonate composition as 100 wt. %. As shown in Table 1, the low-temperature impact-resistant property of the polycarbonate compositions prepared in comparative Examples 6-7 increased significantly, which could reach 58 kJ/m.sup.2 and 51 kJ/m.sup.2 at −20° C. respectively, and the flame-retardant property increased from V2 (test conditions: 1.0 mm, 2 days, 23° C.) to V0 (test conditions: 1.0 mm, 2 days, 23° C.), but it no longer satisfied the requirement of flame-retardant level UL94 5VB (test conditions: 2.0 mm, 2 days, 23° C.).

(12) Table 2 lists inventive Examples 1-6 of the polycarbonate compositions according to the invention.

(13) Compared to comparative Examples 1-7, surprisingly, by adding 1 wt. % of methyl methacrylate-butadiene-styrene impact modifier, with the weight percent based on the polycarbonate composition as 100 wt. %, to the blend of polycarbonate, polysiloxane-polycarbonate copolymer and phosphazene, the inventive Example 1 made the polycarbonate composition reach the requirement of flame-retardant level UL94 5VB (test conditions: 1.5 mm, 2 days, 23° C.). Meanwhile, at low temperatures between −20° C. and −40° C., the notched impact strength could reach 59-51 kJ/m.sup.2. The low-temperature impact-resistant property was improved.

(14) In the inventive Example 2, by increasing the content of methyl methacrylate-butadiene-styrene impact modifier to 2 wt. %, with the weight percent based on the polycarbonate composition as 100 wt. %, the resulting polycarbonate composition reached flame-retardant level UL94 5VB (test conditions: 1.5 mm, 2 days, 23° C.). Meanwhile, at low temperatures between −20° C. and −40° C., the notched impact strength could reach 61-54 kJ/m.sup.2. The low-temperature impact-resistant property was improved.

(15) In view of the main failure mode which is burning and dripping of the tested material in the test of flame-retardant level UL94 5VB, inventive Examples 3 and 4 verified the influence of impact modifier methyl methacrylate-butadiene-styrene on the flame retardance property of the polycarbonate composition under the condition of reducing the amount of the anti-dripping agent. As shown in Table 2, in inventive Examples 3 and 4, the amount of the anti-dripping agent (PTFE) reduced from 0.8 wt. % to 0.3 wt. %, with the weight percent based on the weight of the polycarbonate composition as 100%. The resulting polycarbonate composition could still reach the requirement of the flame-retardant level UL94 5VB (test conditions: 1.5 mm, 2 days, 23° C.), and the notched impact strength could reach 60 kJ/m.sup.2 (test conditions: −20° C., 3 mm, 5.5 J). The low-temperature impact-resistant property was improved.

(16) In inventive Examples 5 and 6, M2600 polycarbonate component having a higher molecular weight was replaced with M2400 which has a lower molecular weight. Moreover, in inventive Example 6, the content of the polysiloxane-polycarbonate copolymer was reduced to 30 wt. % relative to inventive Examples 1-5, with the weight percent based on the weight of the polycarbonate composition as 100%, and the polycarbonate composition could still reach the requirement of the flame-retardant level UL94 5VB (test conditions: 1.5 mm, 2 days, 23° C.), and the notched impact strength could still reach 54-56 kJ/m.sup.2 (test conditions: −20° C., 3 mm, 5.5 J). The low-temperature impact-resistant property was improved.

(17) Compared with comparative Example 7 which used the phosphate flame retardant AKD STAB FP-800, inventive Example 1 shows that flame retardant phosphazene under a synergy with the polysiloxane-polycarbonate copolymer and the impact modifier methyl methacrylate-butadiene-styrene could enable the polycarbonate composition reach the requirement of flame-retardant level UL94 5VB (test conditions: 1.5 mm, 2 days, 23° C. and 2.0 mm, 2 days, 23° C.).

(18) TABLE-US-00002 TABLE 1 Comparative Examples 1-7 Comparative Examples 1 2 3 4 5 6 7 M.2800 95.3 94.3 M.2600 96.3 95.3 94.3 56.3 56.3 M.2400 polysiloxane-polycarbonate copolymer ST6-3022PJ(1) 40 40 FS200 (PTFE MB) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 phosphazene FP-110 2.5 3.5 4.5 2.5 2.5 2.5 AKD STAB FP-800 2.5 Kane ACE M732 1 2 1 Properties Test Conditions Units Test Standards melt volume flow rate MVR 300° C., 1.2 kg cm.sup.3/10 min ISO 1133-1: 10.40 11.90 12.20 9.73 8.78 8.05 7.20 2011 Izod notched impact strength −20° C., 3 mm, kJ/m.sup.2 according to 8.1C 8.6C 9.0C 12C 16C 58 61 5.5 J ISO −30° C., 3 mm, kJ/m.sup.2 180/A: 2000 9.3C 8.7C 8.8C 11C 15C 29 56 5.5 J −40° C., 3 mm, kJ/m.sup.2 9.1C 8.6C 8.7C 9.9C  12C 19 24 5.5 J thermal property Vicat softening temperature 50N; 120K/h ° C. ISO 306: 2013 138 135 134 138 138 138 135 flame retardance 1.5 mm 2 days Class UL94: 2006 V0 V0 V0 V0 V0 V0 V0 property UL94 1.0 mm 2 days Class UL94: 2006 V1 V1 V0 V1 V2 V0 V0 flame retardance 2.0 mm 2 days Class UL94: 2006 not not not pass pass not not property UL94 5VB pass pass pass pass pass flame retardance 1.5 mm 2 days Class UL94: 2007 pass pass property UL94 5VB

(19) TABLE-US-00003 TABLE 2 Inventive Examples 1-6 inventive Examples 1 2 3 4 5 6 M.2600 55.3 54.3 55.6 55.8 M.2400 55.6 64.6 polysiloxane-polycarbonate copolymer ST6-3022PJ(1) 40 40 40 40 40 30 FS200 (PTFE MB) 0.8 0.8 0.5 0.3 0.5 0.5 phosphazene FP-110 2.5 2.5 2.5 2.5 2.5 2.5 Kane ACE M732 1 2 1 1 1 2 Properties Test Conditions Units Standards melt volume flow 300° C., 1.2 kg cm.sup.3/10 min ISO 1133-1: 7.05 6.98 7.68 7.94 9.42 10.4 rate MVR 2011 Izod notched −20° C., 3 mm, kJ/m.sup.2 according to 59 61 60 60 54 56 impact strength 5.5 J ISO −30° C., 3 mm, kJ/m.sup.2 180/A: 2000 59 56 58 59 50 51 5.5 J −40° C., 3 mm, kJ/m.sup.2 51 54 54 53 36 41 5.5 J thermal property Vicat softening temperature 50N; 120K/h ° C. ISO 306: 2013 136 136 138 137 137 137 flame retardance 1.5 mm 2 days Class UL94: 2006 V0 V0 V0 V0 V0 V0 property UL94 1.0 mm 2 days Class UL94: 2006 V0 V0 V0 V0 V0 V1 flame retardance 2.0 mm 2 days Class UL94: 2006 pass pass pass pass pass pass property UL94 5VB flame retardance 1.5 mm 2 days Class UL94: 2007 pass pass pass pass pass pass property UL94 5VB

(20) As shown in inventive Examples 1-6 in Table 2, the polycarbonate compositions comprising a polycarbonate component, a polysiloxane-polycarbonate copolymer, phosphazene and methyl methacrylate-butadiene-styrene exhibit good impact resistance property, flame retardance and thermal resistance simultaneously.

(21) Table 3 lists comparative Examples 8-11 of the invention. In comparative Examples 8-11, impact modifiers other than methyl methacrylate-butadiene-styrene were used in the polycarbonate composition, while methyl methacrylate-butadiene-styrenes, such as acrylic rubber-based impact modifiers, Paraloid EXL2300, Paraloid EXL2311, Paraloid EXL2313, were not used. The results of comparative Examples 8-11 show that far from making the polycarbonate compositions reach the requirement of flame-retardant level UL94 5VB (test conditions: 2.0 mm, 2 days, 23° C.), they reduced the flame retardance property of the polycarbonate compositions from UL94 V0 (test conditions: 1.0 mm, 2 days, 23° C.) in inventive Examples 1 and 2 to UL94 V1 (test conditions: 1.0 mm, 2 days, 23° C.) in comparative Examples 8-11, and the decrease of low-temperature impact-resistant property was also observed.

(22) Table 4 lists inventive Examples 7-18 according to the present invention. As shown in Table 4, in inventive Examples 7-18, phosphazene was in an amount of 1.5 wt. % to 5 wt. %; methyl methacrylate-butadiene-styrene was in an amount of 1 wt. % to 5 wt. %; polysiloxane-polycarbonate copolymer was in an amount of 40 wt. % to 80 wt. %; with the weight percent based on the polycarbonate composition as 100 wt. %. Inventive Examples 1-18 show that synergy among polycarbonate, polysiloxane-polycarbonate copolymer, phosphazene and methyl methacrylate-butadiene-styrene enables the polycarbonate composition to realize a good low-temperature impact-resistant property within a broad scope of amount selections, e.g., reaching a low-temperature impact strength at −40° C., good flame retardance, e.g., reaching UL94 5VB (test conditions: 1.5 mm, 2 days, 23° C.) and UL94 5V0 (test conditions: 1.0 mm, 2 days, 23° C., as well as good thermal resistance, e.g., the Vicat softening temperature can be greater than 127° C.

(23) Inventive Examples show that in the present invention, the inventive combination of a polycarbonate component, a polysiloxane-polycarbonate copolymer, methyl methacrylate-butadiene-styrene, and phosphazene compound realizes synergistically the high flame retardance and the strong impact-resistant property of the polycarbonate composition.

(24) TABLE-US-00004 TABLE 3 Comparative Examples 8-13 Comparative Examples 8 9 10 11 polycarbonate M.2600 000000 55.3 54.3 55.3 55.3 polysiloxane-polycarbonate copolymer ST6-3022PJ(1) 40 40 40 40 anti-dripping agent FS200 (PTFE MB) 0.8 0.8 0.8 0.8 phosphazene FP-110 2.5 2.5 2.5 2.5 impact modifier Kane ACE M732 impact modifier Paraloid EXL2300 1 2 impact modifier Paraloid EXL2311 1 impact modifier Paraloid EXL2313 1 Properties Test Conditions Units Standards melt volume flow rate MVR 300° C., 1.2 kg cm.sup.3/10 min ISO 1133-1: 2011 7.2 6.9 7.7 7.3 Izod notched impact strength −20° C., 3 mm, kJ/m.sup.2 according to ISO 62 60 60 63 5.5 J 180/A: 2000 −30° C., 3 mm, kJ/m.sup.2 55 57 56 56 5.5 J −40° C., 3 mm, kJ/m.sup.2 31 53 29 28 5.5 J Vicat softening temperature 50N; 120K/h ° C. ISO 306: 2013 137 137 138 137 flame retardance property UL94 1.5 mm 2 days Class UL94: 2006 V0 V1 V0 V0 1.0 mm 2 days Class UL94: 2006 V1 V1 V1 V1 flame retardance property UL94 5VB 2.0 mm 2 days Class UL94: 2006 not not not not pass pass pass pass flame retardance property UL94 5VB 1.5 mm 2 days Class UL94: 2007

(25) TABLE-US-00005 TABLE 4 Inventive Examples 7-18 Inventive Examples serial No. of the Examples 7 8 9 10 11 12 13 14 15 16 17 18 polycarbonate M.2600 35 15 14 53 51 33 13 11 56 53 51 49 polysiloxane-polycarbonate copolymer ST6-3022PJ(1) 60 80 80 40 40 60 80 80 40 40 40 40 anti-dripping agent FS200 (PTFE MB) 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 phosphazene FP-110 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 1.5 3.5 4.5 5 MBS impact modifier Kane ACE M732 1 1 2 3.5 5 3.5 3.5 5 1 2 3 5 Test Properties Conditions Units Standards melt volume 300° C., 1.2 kg cm.sup.3/10 min ISO 1133-1: 7.73 5.5 4.9 6.7 6.0 5.5 4.2 3.5 8.7 9.2 8.9 7.9 flow rate 2011 MVR Izod notched −20° C., 3 mm, kJ/m.sup.2 according to 56P 55P 57P 57P 55P 56P 53P 51P 63P 56P 55P 53P impact 5.5 J ISO strength −30° C., 3 mm, kJ/m.sup.2 180/A: 2000 54P 54P 54P 55P 52P 53P 51P 49P 57P 53P 53P 53P 5.5 J −40° C., 3 mm, kJ/m.sup.2 50P 51P 50P 50P 49P 52P 50P 48P 49P 48P 48P 51P 5.5 J Vicat 50N; 120K/h ° C. ISO 306: 2013 136 135 133 135 135 134 132 132 138 133 130 127 softening temperature flame 1.5 mm 2 days Class UL94: 2006 V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 retardance 1.0 mm 2 days Class UL94: 2006 V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 V0 property UL94 flame 2.0 mm 2 days Class UL94: 2006 pass pass pass pass pass pass pass pass pass pass pass pass retardance property UL94 5VB flame 1.5 mm 2 days Class UL94: 2007 pass pass pass pass pass pass pass pass pass pass pass pass retardance property UL94 5VB

(26) TABLE-US-00006 TABLE 5 Comparative examples 12 to 14 and inventive example 19 comparative inventive 19 20 21 22 M.2600 90.3 85.3 75.3 65.3 Polysiloxane-polycarbonate copolymer ST6-3022PJ(1) 5 10 20 30 FS200 (PTFE MB) 0.8 0.8 0.8 0.8 Phosphazene FP-110 2.5 2.5 2.5 2.5 Kane ACE M732 1 1 1 1 Properties Test conditions Units Standards MVR 300° C., 1.2 kg cm.sup.3/10 min ISO 1133-1: 2011 10.9 10.0 8.8 8.1 Izod notched impact strength −20° C., 3 mm. 5.5 J kJ/m.sup.2 Based on ISO 14C 19C 59P 64P −30° C., 3 mm. 5.5 J kJ/m.sup.2 180/A: 2000 12C 16C 40P 57P −40° C., 3 mm. 5.5 J kJ/m.sup.2 10C 11C 15C 21C Vicat softening temperature 50N; 120K/h ° C. ISO 306: 2013 139 139 138 138 Burning behaviour UL94 1.5 mm 2 days Class UL94: 2006 V0 V0 V0 V0 1.0 mm 2 days Class UL94: 2006 V0 V1 V1 V0 Burning behaviour UL94 5VB 2.0 mm 2 days Class UL94: 2006 Pass Pass Pass Pass Burning behaviour UL94 5VB 1.5 mm 2 days Class UL94: 2007 Pass Pass Pass Pass

(27) As can be seen from table 5, the compositions of the present invention provide an excellent property profile in that flame retardancy and mechanical properties are optimized when an amount of at least 25 wt.-% of the polysiloxane-polycarbonate copolymer is used.

(28) Although the above text explains the present invention in detail with respect to the object of the present invention, it should be understood that such detailed explanation is only exemplary, apart from the contents that can be defined by the claims, persons skilled in the art can make various changes under the condition of not deviating from the spirit and the scope of the present invention.