Ciba Specialty Chemicals Corporation

Andr&eacute; Geoffroy

Daniel Thibaut

Benjamin Breitenstein

Andr&eacute; Schmitter

Christoph Kleiner

Matthias Von Frieling

Martin Von B&uuml;ren

Peter Rohringer

Andreas Burkhard

Josef Zelger

Erwin Marti

Werner Schreiber

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

Preparation of low-dust stabilisers

The present invention provides a hydrate of the 4,4&prime;-di-triazinylamino-2,2&prime;-di-sulfostilbene compound having the formula:

Triazinylaminostilbene compounds

A description is given of an extrusion process for the preparation of a low-dust stabilizer, using a subcooled melt as granulation liquid, as well as of novel amorphous modifications of different stabilizers, including 2,2&prime;-methylenebis(4-&lsqb;1,1,3,3-tetramethylbutyl&rsqb;-6-benzotriazol-2-yl-phenol), and of the &bgr;-crystalline modification of 2-(2-hydroxy-3,5-di-tert-butylphenyl)-5-chlorobenzotriazole and of the preparation thereof. The novel process affords products which are easy to handle and which are flowable, and the novel modifications have advantages as regards their preparation, processing and their use as stabilizer.

Preparation of low-dust stabilizers

Growing community of inventors

Habsheim, France

André Geoffroy

Growing community of inventors

Habsheim, France

Andr&eacute; Geoffroy

André Geoffroy