Impact-resistance-modified filled polycarbonate compositions
View Patent ↗A thermoplastic molding composition that features good mechanical properties as well as processability is disclosed. The composition that contains aromatic polycarbonate and/or aromatic polyester carbonate, rubber-modified graft polymer and a plurality of hollow ceramic beads is suitable for making molded articles characterized by good ESC behavior and flammability rating.
1. A thermoplastic molding composition consisting of
A) 10-90 parts by weight of at least one member selected from the group consisting of aromatic polycarbonate and aromatic polyester carbonate,
B) 0.5-30 parts by weight of rubber-modified graft polymer,
C) 0.1-50 parts by weight of a plurality of hollow ceramic beads having a density of 2-3 g/cm 3 and a mean particle size from 0.5 to 100 μm,
D) optionally phosphorous-containing flame proofing agent,
E) optionally vinyl (co)polymer, and
F) optionally at least one conventional functional additive selected from the group consisting of flame-retardant synergist, anti-dripping agent, lubricant, mold-release agent, nucleating agent, stabilizer, antistatic agent, conductive carbon black, carbon fibers, metal fibers, carbon nanotubes, dyestuffs and pigment.
2. The composition of claim 1 , wherein the phosphorous-containing flame proofing agent is present in 1-18 parts by weight.
3. The composition of claim 1 , wherein the vinyl(co)polymer is present in 1-30 parts by weight.
4. The composition of claim 1 , wherein the conventional functional additive is present in 0.5-5 parts by weight.
5. The composition according to claim 1 , wherein Al 2 O 3 content of the hollow ceramic beads is 15 to 45 percent relative to their weight.
6. The composition according to claim 1 , wherein the hollow ceramic beads exhibit compressive strengths of 50-700 MPa.
7. The composition according to claim 2 , wherein said phosphorus-containing flameproofing agent conforms to formula (IV)
wherein
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, in each instance optionally substituted by alkyl, and/or halogen,
n denotes, independently of one another, 0 or 1,
q denotes 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.
8. The composition according to claim 7 , wherein said X is the residue of bisphenol A.
9. A molded article comprising the composition according to claim 1 .