Flame retardant impact-modified polycarbonate composition

1. A flame retardant impact-modified polycarbonate composition comprising, relative to the total weight of the polycarbonate composition:

A) 50-90 wt. % of at least one aromatic polycarbonates,

B) 3-15 wt. % of at least one rubber-modified vinyl (co)polymer,

C) 5-17 wt. % of a flame retardant combination of i) a DiDOPO compound and ii) a monomeric and/or oligomeric phosphoric and/or phosphonic acid ester, wherein the DiDOPO compound represents from 10 wt. % to 90 wt. % of the flame retardant combination, wherein the DiDOPO compound is selected from the compounds of formula (IV):

wherein

Ar denotes C 3 -C 18 heteroaryl or C 6 -C 18 aryl;

R 1 and R 2 , independently of one another, denote hydrogen, C 1 -C 18 alkyl, C 3 -C 18 heteroaryl or C 6 -C 18 aryl;

R 3 , R 4 , R 5 and R 6 , independently of one another, denote hydrogen, C 1 -C 18 alkyl, C 3 -C 18 heteroaryl or C 6 -C 18 aryl;

m, n, k, and p individually selectable from 0, 1, 2, 3, 4;

any hydrogen atom on the aryl or heteroaryl aromatic ring can be independently replaced by any C 1 -C 18 alkyl group.

2. The polycarbonate composition according to claim 1 , wherein the rubber-modified vinyl (co)polymer comprises

B1) 5 to 95 wt. %, of at least one vinyl monomer on

B2) 95 to 5 wt. %, of one or more graft bases having a glass transition temperature of <10° C.,

the wt. % is calculated based on the weight of the rubber-modified vinyl (co)polymer.

3. The polycarbonate composition according to claim 2 , wherein the at least one vinyl monomer B1 is a mixture of

B1.1) 50 to 99 wt. %, of vinylaromatics and/or vinylaromatics substituted on the nucleus and/or methacrylic acid (C 1 -C 8 )-alkyl esters and

B1.2) 1 to 50 wt. %, of vinyl cyanides (unsaturated nitriles, and/or (meth)acrylic acid (C 1 -C 8 )-alkyl esters, and/or derivatives of unsaturated carboxylic acids,

the wt. % is calculated based on the weight of the vinyl monomer B1;

and/or

the graft base B2 is chosen from diene rubbers, or mixtures of diene rubbers or copolymers of diene rubbers or mixtures thereof with further copolymerizable monomer, with the proviso that the glass transition temperature of component B2 is below <10° C.

4. The polycarbonate composition according to claim 1 , wherein the monomeric and/or oligomeric phosphoric and/or phosphonic acid ester is selected from compounds of formula (V)

wherein

R 1 , R 2 , R 3 and R 4 , independently of one another, denote C 1 -C 8 alkyl, C 5 -C 6 cycloalkyl, C 6 -C 20 aryl or C 7 -C 12 aralkyl each optionally substituted by alkyl,

n independently of one another, denotes 0 or 1,

q denotes a number ranging from 0 to 30, and

X denotes a mononuclear or polynuclear aromatic residue with 6 to 30 C atoms or a linear or branched aliphatic residue with 2 to 30 C atoms, which optionally being OH-substituted and containing up to eight ether bonds.

5. The polycarbonate composition according to claim 1 , further comprising D) a rubber-free vinyl copolymer made of

D1) from 65 to 85% by weight, based on the rubber-free vinyl copolymer, of at least one monomer selected from the group of the vinyl aromatics and ring-substituted vinyl aromatics, and

D2) from 15 to 35% by weight, based on the rubber-free vinyl copolymer, of at least one monomer selected from the group of the vinyl cyanides, (C 1 -C 8 )-alkyl (meth)acrylates, unsaturated carboxylic acids and derivatives of unsaturated carboxylic acids.

6. The polycarbonate composition according to claim 1 , wherein the total amount of the rubber-modified vinyl (co)polymer and rubber-free vinyl copolymer is from 5 wt. % to 10 wt. %, the total amount of the flame retardant combination of i) a DiDOPO compound and ii) a monomeric and/or oligomeric phosphoric and/or phosphonic acid ester ranges from 4 wt. % to 9 wt. %, relative to the total weight of the polycarbonate composition, wherein the DiDOPO compound represents 20 wt. % to 80 wt. % of the flame retardant combination.

7. The polycarbonate composition according to claim 1 , wherein the total amount of the rubber-modified vinyl (co)polymer and rubber-free vinyl copolymer is from 10 wt. % to 15 wt. %, the total amount of the flame retardant combination of i) a DiDOPO compound and ii) a monomeric and/or oligomeric phosphoric and/or phosphonic acid ester ranges from 9 wt. % to 14 wt. %, relative to the total weight of the polycarbonate composition, wherein the DiDOPO compound represents 10 wt. % to 60 wt. % of the flame retardant combination.

8. The polycarbonate composition according to claim 1 , further comprising one or more additive selected from antidripping agents, internal and external lubricants, mould release agents, flowability auxiliary agents, antistatic agents, conductivity additives, stabilizers, additives for improving scratch resistance, IR absorbents, optical brighteners, fluorescent additives, and dyestuffs and pigments.

9. A shaped article made from the polycarbonate composition according to claim 1 .

10. The shaped article according to claim 9 , wherein the shaped article is a part for adaptor, charger, projector, network device, TV, or notebook.

11. A method for preparing a shaped article comprising injection moulding, extrusion moulding, blowing moulding process or thermoforming a polycarbonate composition according to claim 1 .