Invention Publication
- Patent Title: PELLETIZATION OF A POLYMER STABILIZER MIXTURE
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Application No.: US18278641Application Date: 2022-02-18
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Publication No.: US20240149496A1Publication Date: 2024-05-09
- Inventor: Thomas Georg GFROERER , Oliver REICH , Heinz HERBST , Gazi TUERKOGLU
- Applicant: BASF SE
- Applicant Address: DE Ludwigshafen am Rhein
- Assignee: BASF SE
- Current Assignee: BASF SE
- Current Assignee Address: DE Ludwigshafen am Rhein
- Priority: EP 159436.1 2021.02.25
- International Application: PCT/EP2022/054088 2022.02.18
- Date entered country: 2023-08-24
- Main IPC: B29B9/06
- IPC: B29B9/06 ; B29B9/12 ; C08J3/12 ; C08K5/098 ; C08K5/134 ; C08K5/526 ; C08L23/16

Abstract:
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) 35 to 45 wt. % of tris(2,4-ditert-butylphenyl) phosphite (CAS-No. 31570-04-4), (i-2) 15 to 25 wt. % of tetrakis-[3-(3,5-ditert-butyl-4-hydroxy-phenyl)-propionyloxymethyl]methane (CAS-No. 6683-19-8), (i-3) 35 to 45 wt. % of a C16-C18 fatty acid calcium salt, and wt. % of the polymer stabilizers (i-1), (i-2) and (i-3) are based on the weight of the polymer N stabilizer mixture, and (ii) 3 to 13 wt. % of a processing aid, which is a propylene-ethylene copolymer and which possesses a melting enthalpy below 100 J/g at 101.32 kPa. 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.
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