Granular polymer additives and their preparation

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/13 (2006.01) B01J 2/00 (2006.01) B29B 9/00 (2006.01) B29B 9/12 (2006.01)

Patent

CA 2438893

A compacted particulate polymer additive composition in a dry granular form formed from a substantially uniform mixture of the following components: (a) at least one particulate sterically-hindered phenolic compound, and (b) one or more particulate polymer additives other than a sterically-hindered phenolic compound; wherein the particles of said composition are held together in compacted dry granular form exclusively or substantially exclusively by contact with dried surfaces of in situ desolvated particles from particles of one or more at least partially solvated components of (a), and optionally by contact with dried surfaces of in situ desolvated particles from particles of one or more at least partially solvated components of (b). Compositions of this type except that there is no component (b) are also described.

L'invention concerne une composition d'additifs polymères particulaires compactés, sous forme granulaire sèche, constituée à partir d'un mélange sensiblement uniforme des constituants suivants: (a) au moins un composé phénolique particulaire à empêchement stérique, et (b) un ou plusieurs additifs polymères particulaires autres qu'un composé phénolique particulaire à empêchement stérique; les particules de ladite composition étant maintenues entre elles sous forme granulaire sèche compactée, exclusivement ou sensiblement exclusivement par contact avec des surfaces séchées de particules désolvatées in situ provenant de particules d'un ou de plusieurs constituants au moins partiellement solvatés de (a), et éventuellement par contact avec des surfaces séchées de particules désolvatées in situ provenant de particules d'un ou de plusieurs constituants au moins partiellement solvatés de (b). Des compositions de ce type, à l'exception du fait qu'elles ne contiennent pas de constituant (b) sont également décrites.

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