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    • 6. 发明申请
    • PELLETIZATION OF A POLYMER STABILIZER MIXTURE
    • WO2022189112A1
    • 2022-09-15
    • PCT/EP2022/053891
    • 2022-02-17
    • BASF SE
    • GFROERER, Thomas Georg
    • B29B9/08B29B9/12C08J3/22C08K5/01C08K5/134C08K5/526
    • The invention relates to a method for manufacturing a pellet in a pellet mill, which method comprises the steps of (A) pressing a mixture for compaction by a roller through a nozzle to obtain a strand, and (B) comminuting the strand to obtain the pellet, wherein the mixture for compaction comprises (i) 87 to 97 wt.% of a polymer stabilizer mixture polymer stabilizer mixture, which comprises the polymer stabilizers (i-1) 62 to 72 wt.% of tris(2,4-ditert-butylphenyl) phosphite (CAS-No. 31570-04-4), (i-2) 28 to 38 wt.% of tetrakis-[3-(3,5-ditert-butyl-4-hydroxy-phenyl)-propionyloxymethyl]me- thane (CAS-No. 6683-19-8), and wt.% of the polymer stabilizers (i-1) and (i-2) are based on the weight of the polymer stabilizer mixture, and (ii) 3 to 13 wt.% of a processing aid, which is a polyethylene and which possesses a weight average molecular weight above 2500 Da and below 16000 Da. The pellet is useful for a dust-free handling of its polymer stabilizer mixture at a manufacturing of a stabilized polymer. Furthermore, a method for stabilizing a polymer, which is a polyolefin, a polystyrene or a mixture thereof, is disclosed, which comprises the dosing of the pellet to the polymer.