Flameproofed impact-strength-modified poly(ester)carbonate compositions
View Patent ↗A poly(ester)carbonate compositions characterized by its flame resistance and high impact strength is disclosed. The composition that contains branched aromatic poly(ester)carbonate, a graft polymer wherein the graft base is silicone rubber or silicone-acrylate rubber, talc, phosphorus-containing flameproofing agent, and an inorganic boron compound, and an optional anti-dripping agent satisfies enhanced fire-protection requirements.
1. A thermoplastic composition comprising
A) 40-95 parts by weight of branched aromatic polycarbonate and/or aromatic poly(ester)carbonate,
B) 1-25 parts by weight of a graft polymer including at least one graft base selected from the group consisting of silicone rubber and silicone-acrylate rubber,
C) 9-18 parts by weight of talc,
D) 0.4-20 parts by weight of phosphorus-containing flameproofing agent,
E) 1-6 parts by weight of at least one inorganic boron compound selected from the group consisting of Zn 4 B 2 O 7 .H 2 O, Zn 2 B 6 O 11 .3.5H 2 O and ZnB 4 O 7 .4H 2 O, and
F) 0-3 parts by weight of an anti-dripping agent.
2. The composition according to claim 1 , wherein the branched poly(ester)carbonate contains residues of at least one amine functionality.
3. The composition according to claim 1 wherein the graft polymer (B) is synthesised from
B.1 5 wt. % to 95 wt. % of one or more vinyl monomers on
B.2 95 wt. % to 5 wt. % of one or more graft bases exhibiting a glass transition temperature <10° C. selected from the group consisting of silicone rubber and silicone-acrylate rubber.
4. The composition according to claim 1 wherein the phosphorus-containing flameproofing agent conforms to formula (VIII)
in which
R 1 , R 2 , R 3 and R 4 independently of one another denote C 1 to C 8 alkyl, C 5 to C 6 cycloalkyl, C 6 to C 20 aryl or C 7 to C 12 aralkyl,
n independently of one another denote 0 or 1,
q is 0 to 30 and
X is a residue of an aromatic compound having 6 to 30 C atoms, or of a linear or branched aliphatic compound having 2 to 30 C atoms.
5. The composition according to claim 4 , wherein X is the residue of bisphenol A.
6. The composition according to claim 1 wherein said graft polymer is present in amount of 4.7 to 6.6 parts by weight.
7. The composition according to claim 1 wherein said talc is present in an amount of 10 to 12 parts by weight.
8. The composition according to claim 1 wherein the mean particle size of the talc is 1.1 μm to 5 μm.
9. The composition according to claim 1 wherefrom thermoplastic vinyl (co)polymers and polyalkylene terephthalates are absent.
10. The composition according to claim 1 further containing at least one member selected from the group consisting of lubricant, mold-release agent, nucleating agent, antistatic agent, stabilizer, dyestuff, pigment, filler, and reinforcing material different from talc.
11. The composition according to claim 1 further containing at least one inorganic compound with an average particle diameter of less than or equal to 200 nm.
12. An article of manufacture comprising the composition of claim 1 .
13. The composition according to claim 1 , wherein the inorganic boron compound is present in 2-4 parts by weight.
14. The composition according to claim 1 , wherein the inorganic boron compound is Zn 2 B 6 O 11 .3.5H 2 O.
15. The composition according to claim 13 , wherein the inorganic boron compound is Zn 2 B 6 O 11 .3.5H 2 O.