Dry-coated oxygen-scavenging particles and methods of making...

Details Dry-coated oxygen-scavenging particles and methods of making... Dry-coated oxygen-scavenging particles and methods of making...

B - Operations, Transporting

32

B

B32B 15/02 (2006.01) B05D 7/00 (2006.01)

Patent

CA 2616032

Heterogeneous oxygen-scavenging particles are formed by dry coating activating component particles onto oxidizable component particles, largely through a succession of mechanical motions. The component particles are repeatedly mixed, compressed, and sheared. Smaller activating component particles coat the surface of larger oxidizing component particles by force-induced contact, while irregularities are removed by abrasion among the particles. The oxygen- scavenging particles can be blended together with a base polymer into a masterbatch having a higher concentration than required for use as an active barrier to oxygen permeation. The masterbatch can be diluted with the same or a compatible polymer to form the active barrier.

L'invention concerne des particules désoxygénantes hétérogènes formées par enrobage à sec de particules constituantes activantes sur des particules constituantes oxydables, l'opération étant réalisée essentiellement par une succession de mouvements mécaniques. Les particules constituantes sont mélangées de façon répétées, comprimées et cisaillées. Des particules constituantes activantes plus petites recouvrent la surface de particules constituantes oxydantes plus grandes par contact forcé, pendant que des irrégularités sont éliminées par abrasion des particules. Les particules désoxygénantes de l'invention peuvent être mélangées ensemble avec un polymère de base pour former un mélange maître dont la concentration est supérieure à celle requise pour utilisation comme barrière active contre la perméabilité à l'oxygène. Le mélange maître peut être dilué avec un polymère identique ou compatible pour former la barrière active.

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