PREPARATION OF LOW-DUST STABILISERS

摘要

A description is given of an extrusion process for the preparation of a lowdust stabiliser, using a subcooled melt as granulation liquid, as well as of amorphous modifications of different stabilisers, including 2,2'methylenebis(4-¢1,1,3,3-tetramethylbutyl!-6-benzotriazol-2-yl-phenol), and of the .beta.-crystalline modification of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole and of the preparation thereof. The process affords products which are easy to handle and which are flowable, and the modifications have advantages as regards their preparation, processing and their use as stabiliser.