METHOD FOR PREPARING EXPANDABLE POLYSTYRENE BY CONTINUOUSLY INJECTING LIQUID ORGANIC PEROXIDE

摘要

The present invention relates to a method for preparing expandable polystyrene, the method including the following steps: i°) heating an aqueous suspension containing a styrene monomer and at least one organic peroxide initiator of formula (I): 1-alkoxy-1-t-alkylperoxycyclohexane, where the alkoxy grouping includes 1 to 4 carbon atoms, the t-alkyl grouping includes 4 to 12 carbon atoms, and the cyclohexane ring is optionally substituted by 1 to 3 alkyl groupings, each independently comprising 1 to 3 carbon atoms, at a temperature of 100 to 120°C; and ii°) adding a blowing agent selected from the group consisting of alkanes comprising 4 to 6 carbon atoms, and the mixtures thereof. The present invention also relates to expandable polystyrene that can be produced by such a method, and to insulating parts and packaging including such expandable polystyrene.