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US 11,535,747 B2Granted
Talc-filled polycarbonate compositions
AssigneeCovestro Deutschland AG
InventorsTim Hungerland, Tanja Cassel
Life of this patent
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Abstract
The invention relates to the use of PMMI copolymers for reducing the decrease in molecular weight of the polymer induced by addition of talc in compositions based on aromatic polycarbonate. At the same time, the mechanical, optical and rheological properties of the thermoplastic composition, in spite of the addition of the PMMI copolymer, remain good and are in some cases even improved.
Claims10
A composition comprising
- A) at least 60% by weight of aromatic polycarbonate,
- B) 5% to 35% by weight talc,
- C) 2% to 8% by weight of PMMI copolymer, wherein the PMMI copolymer has 4% to 55% by weight of methyl methacrylate units, at least 36% to 95% by weight of methylmethacrylimide units, a total of 0.5% to 12%% by weight of methylmethacrylic acid units and methylmethacrylic anhydride units, based in each case on the total weight of the PMMI copolymer, and an acid number, determined according to DIN 53240-1:2013-06, of 15 to 50 mg KOH/g, and
- D) optionally further additives.
1 more element
A composition comprising
- A) at least 60% by weight of aromatic polycarbonate,
- B) 5% to 30% by weight talc,
- C) 2% to 8% by weight of PMMI copolymer, wherein the PMMI copolymer has 4% to 55% by weight of methyl methacrylate units, at least 36% to 95% by weight of methylmethacrylimide units, a total of 0.5% to 12%% by weight of methylmethacrylic acid units and methylmethacrylic anhydride units, based in each case on the total weight of the PMMI copolymer, and an acid number, determined according to DIN 53240-1:2013-06, of 15 to 50 mg KOH/g, and
- D) optionally further additives.
1 more element
Dependencies are inferred from the claim text.