US 11,912,865 B2
Heat-conducting polycarbonates having improved flame protection by means of barium sulfate
Christopher Schirwitz, Leverkusen (DE); Tim Hungerland, Cologne (DE); Tanja Grueter-Reetz, Krefeld (DE); and Helmut Kruells, Meerbusch (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Appl. No. 17/604,078
Filed by COVESTRO INTELLECTUAL PROPERTY GMBH & CO. KG, Leverkusen (DE)
PCT Filed Apr. 9, 2020, PCT No. PCT/EP2020/060151
§ 371(c)(1), (2) Date Oct. 15, 2021,
PCT Pub. No. WO2020/212245, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 19170116 (EP), filed on Apr. 18, 2019.
Prior Publication US 2022/0220301 A1, Jul. 14, 2022
Int. Cl. C08L 69/00 (2006.01); C08K 3/34 (2006.01); C08K 3/30 (2006.01); C08K 5/42 (2006.01); C08G 64/04 (2006.01); C08J 3/00 (2006.01); C08K 3/22 (2006.01); C08L 51/06 (2006.01)
CPC C08L 69/00 (2013.01) [C08G 64/04 (2013.01); C08J 3/005 (2013.01); C08K 2003/2241 (2013.01); C08K 2003/3045 (2013.01); C08L 51/06 (2013.01); C08L 2201/02 (2013.01)] 13 Claims
 
1. A thermoplastic composition, comprising:
A) at least one aromatic polycarbonate;
B) talc;
C) at least one anhydride-modified alpha-olefin polymer having an acid number of ≥30 mg KOH/g and an average molecular weight MW of ≥4000 to ≤40 000 g/mol, wherein the average molecular weight MW is determined by gel permeation chromatography in ortho-dichlorobenzene at 150° C. with polystyrene calibration and the acid number is determined by potentiometric titration with alcoholic potassium hydroxide solution according to DIN ISO 17025:2005, wherein the anhydride-modified alpha-olefin polymer C) comprises ≥90.0% to ≤98.0% by weight of alpha-olefin polymer and ≥2.0% to ≤10.0% by weight of anhydride, wherein the reported % by weight values are based on the total weight of the anhydride-modified alpha-olefin polymer and sum to ≤100% by weight;
FR) at least one organic flame retardant selected from: fluoropolymer-containing anti-drip agents, fluorinated sulfonic acid salts, organic phosphoric acid esters, phosphazenes or mixtures of at least two of the abovementioned agents;
D) at least one inorganic compound distinct from talc;
wherein
the composition contains barium sulfate in an amount of ≥3% by weight based on the total weight of the composition;
the composition contains alkaline earth metal sulfates distinct from barium sulfate in an amount of ≥0% by weight to ≤25% by weight based on the total weight of the alkaline earth metal sulfates present in the composition;
the composition contains organic phosphoric acid esters in an amount of ≥0% by weight to ≤7.5% by weight based on the total weight of the composition and
the composition contains ≥0.5% by weight based on the total weight of the composition of fluoropolymer-containing anti-drip agents,
wherein in the case where the composition contains ≥0.1% by weight based on the total weight of the composition of fluorinated sulfonic acid salts, the content of fluoropolymer-containing anti-drip agents is ≥0.7% by weight based on the total weight of the composition.