PREPARATION OF LOW-DUST STABILISERS

摘要

A description is given of an extrusion process for the preparation of a low- dust stabiliser using a sub subcooled melt as granulation liquid, as well as of novel 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 preparatio n thereof. The novel process affords products which are easy to handle ani which are flowable, and the novel modifications have advantage s as regards their preparation, processing and their use as stabiliser.