FLAME-RETARDANT POLYCARBONATE MOULDING MATERIALS IV
The present invention relates to flame-retardant, impact-modified polycarbonate (PC) compositions and moulding compositions which have good mechanical properties, good resistance to chemicals and high hydrolytic stability. The present application additionally relates to the use of the compositions in the production of moulded articles, and to moulded articles produced from the compositions.
1 . Composition comprising
A) from 45.5 to 95.0 parts by weight of aromatic polycarbonate and/or aromatic polyester carbonate,
B) from 1.0 to 15.0 parts by weight of rubber-modified graft polymer,
C) from 1.0 to 9.5 parts by weight of at least one cyclic phosphazene according to formula (X)
wherein
k represents 1 or an integer from 1 to 10, optionally a number from 1 to 8, optionally from 1 to 5,
wherein the trimer content (k=1) is from 60 to 98 mol %, based on component C,
and wherein
R is in each case identical or different and represents an amine radical; C 1 - to C 8 -alkyl, optionally methyl, ethyl, propyl or butyl, each optionally halogenated, optionally halogenated with fluorine; C 1 - to C 8 -alkoxy, optionally methoxy, ethoxy, propoxy or butoxy; C 5 - to C 6 -cycloalkyl each optionally substituted by alkyl, preferably C 1 -C 4 -alkyl, and/or by halogen, optionally chlorine and/or bromine; C 6 - to C 20 -aryloxy, optionally phenoxy, naphthyloxy, each optionally substituted by alkyl, optionally C 1 -C 4 -alkyl, and/or by halogen, optionally chlorine, bromine, and/or by hydroxy; C 7 - to C 12 -aralkyl, optionally phenyl-C 1 -C 4 -alkyl, each optionally substituted by alkyl, optionally C 1 -C 4 -alkyl, and/or by halogen, optionally chlorine and/or bromine; or a halogen radical, preferably chlorine; or an OH radical,
D) from 0 to 15.0 parts by weight of rubber-free vinyl (co)polymer or polyalkylene terephthalate,
E) from 1.0 to 25.0 parts by weight, optionally from 0.05 to 20.0 parts by weight, optionally from 2.0 to 15.0 parts by weight, optionally from 4.0 to 10.0 parts by weight, of talc having a mean particle size d 50 of from 0.1 to 4.0 μm,
F) from 0 to 5.0 parts by weight, optionally from 0.05 to 3.00 parts by weight, optionally from 0.2 to 2.0 parts by weight, optionally from 0.4 to 1.0 part by weight, of one or more additives,
G) from 0.05 to 5.0 parts by weight, optionally from 0.1 to 2.0 parts by weight, optionally from 0.1 to 1.0 part by weight, of one or more antidripping agents,
wherein all the parts by weight are optionally normalised that the sum of the parts by weight of all the components A+B+C+D+E+F+G in the composition is 100.
2 . Composition according to claim 1 , wherein the content of trimers (k=1) is from 60 to 98 mol %, optionally from 65 to 95 mol %, optionally from 65 to 90 mol %, based on component C.
3 . Composition according to claim 1 , wherein the amount of component C is from 4.5 to 8.0 parts by weight.
4 . Composition according to claim 1 , wherein component C is selected from the group consisting of propoxyphosphazenes, phenoxyphosphazenes, methylphenoxyphosphazenes, aminophosphazenes and fluoroalkylphosphazenes.
5 . Composition according to claim 1 , wherein R is phenoxy.
6 . Composition according to claim 1 , in that wherein the content of trimers (k=1) is from 65 to 85 mol %, based on component C.
7 . Composition according to claim 1 , wherein the trimer content (k=1) is from 65 to 85 mol %, the tetramer content (k=2) is from 10 to 20 mol %, the content of higher oligomeric phosphazenes (k=3, 4, 5, 6 and 7) is from 5 to 15 mol %, and the content of phosphazene oligomers with k>=8 is from 0 to 1 mol %, in each case based on component C.
8 . Composition according to claim 1 , wherein component E is present in an amount of from 4.0 to 10.0 parts by weight.
9 . Composition according to claim 1 , wherein the talc has a mean particle size d 50 of from 0.7 to 1.8 μm.
10 . Composition according to claim 1 , wherein the thermoplastic aromatic polycarbonates have a mean molecular weight (weight-average) of from 22,000 to 30,000 g/mol.
11 . Composition according to claim 1 , comprising as component F at least one additive selected from the group consisting of flame-retardant synergists, antidripping agents, lubricants and demoulding agents, nucleating agents, stabilisers, antistatics, colourants and pigments.
12 . Composition according to claim 1 , wherein the graft base of component B is selected from the group consisting of diene rubbers, EP(D)M rubbers, acrylate, polyurethane, silicone, chloroprene and ethylene/vinyl acetate rubbers.
13 . A cyclic phosphazene according to formula (X)
Capable of being used in production of a flame-retardant polymer composition having high stiffness and high notched impact strength with consistently good mechanical properties,
wherein
k represents 1 or an integer from 1 to 10, optionally a number from 1 to 8, optionally from 1 to 5,
wherein the trimer content (k=1) is from 60 to 98 mol %, based on component C,
R is in each case identical or different and represents an amine radical; C 1 - to C 8 -alkyl, optionally methyl, ethyl, propyl or butyl, each optionally halogenated, optionally halogenated with fluorine; C 1 - to C 8 -alkoxy, optionally methoxy, ethoxy, propoxy or butoxy; C 5 - to C 6 -cycloalkyl each optionally substituted by alkyl, optionally C 1 -C 4 -alkyl, and/or by halogen, optionally chlorine and/or bromine; C 6 - to C 20 -aryloxy, optionally phenoxy, naphthyloxy, each optionally substituted by alkyl, optionally C 1 -C 4 -alkyl, and/or by halogen, optionally chlorine, bromine, and/or by hydroxy; C 7 - to C 12 -aralkyl, optionally phenyl-C 1 -C 4 -alkyl, each optionally substituted by alkyl, optionally C 1 -C 4 -alkyl, and/or by halogen, optionally chlorine and/or bromine; or a halogen radical, optionally chlorine; or an OH radical,
14 . A composition according to claim 1 capable of being used in production of injection-moulded and/or thermoformed moulded articles.
15 . Moulded article obtainable from a composition according to claim 1 .