Impact-modified polycarbonate blends
AssigneeBayer Aktiengesellschaft
InventorsAndreas Seidel, Thomas Eckel
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Abstract
A thermoplastic molding composition having improved flammability rating and mechanical properties is disclosed. The composition contains aromatic polycarbonate having a weight-average molecular weight Mw≧25,000 g/mol., polyalkylene terephthalate, graft (co)polymer characterized in that its grafted phase includes structural units derived from acrylate monomers, an oligomeric organic phosphoric acid ester, and an optional fluorinated polyolefin. In a preferred embodiment the graft (co)polymer is characterized in its core-shell morphology.
Claims20
A thermoplastic molding composition comprising
- A) from 40 to 90 parts by weight of aromatic poly(ester) carbonate having a weight-average molecular weight Mw≧25,000 g/mol.,
- B) from 0.5 to 12 parts by weight of polyalkylene terephthalate,
- C) from 1 to 20 parts by weight of graft (co)polymer consisting of from 10 to 90 wt. % (based on the weight of the graft (co)polymer) of a graft base having a glass transition temperature below 0° C., and from 90 to 10 wt. % (based on the weight of the graft (co)polymer) of polymerized vinyl monomers as a grafted phase, the vinyl monomers containing at least 20 wt. % (based on the weight of the grafted phase) of acrylate monomers,
- D) an oligomeric organic phosphonic acid ester or from 2 to 20 parts by weight of an oligomeric organic phosphoric acid ester, and
- E) from 0 to 1 part by weight of fluorinated polyolefin,
- the sum of the parts by weight of all the components A) through E) being 100.
A thermoplastic molding composition comprising
- A) from 40 to 90 parts by weight of aromatic poly(ester) carbonate having a weight-average molecular weight Mw≧25,000 g/mol.,
- B) from 0.5 to 12 parts by weight of polyalkylene terephthalate,
- C) from 1 to 20 parts by weight of graft (co)polymer consisting of from 10 to 90 wt. % (based on the weight of the graft (co)polymer) of a graft base having a glass transition temperature below 0° C., and from 90 to 10 wt. % (based on the weight of the graft (co)polymer) of polymerized vinyl monomers as a grafted phase, the vinyl monomers containing at least 20 wt. % (based on the weight of the grafted phase) of acrylate monomers,
- D) from 2 to 20 parts by weight of an oligomeric organic phosphoric acid ester,
- E) from 0 to 1 part by weight of fluorinated polyolefin, and
- F) from 0 to 10 parts by weight of at least one additive selected from the group consisting of lubricants, mold-release agents, nucleating agents, antistatic agents, stabilisers, colorants, fillers, reinforcing agents, flameproofing agents other than component D), and flameproofing synergists,
- the sum of the parts by weight of all the components A) through F) being 100.
Dependencies are inferred from the claim text.