Improved polyester compositions for multilayer extrusion and...

B - Operations – Transporting – 32 – B

Patent

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B32B 27/08 (2006.01) C08L 29/04 (2006.01) C08L 67/00 (2006.01) C08L 67/02 (2006.01) C08L 77/00 (2006.01) C08L 77/02 (2006.01) C08L 77/06 (2006.01) B29C 49/00 (2006.01) B29C 49/22 (2006.01)

Patent

CA 2408229

Improved multi-layer coextruded blow-molded objects (such as fuel containers) having at least a barrier layer and a support layer are disclosed together with improved methods for preparing such objects. The barrier layer includes an amount of modified polyolefin having approximately the same density as the support layer, wherein the modified polyolefin is prepared by grafting an unsaturated carboxylic acid or a derivative thereof to the polyolefin, the modified polyolefin being added in an amount such that the gas-barrier layer sufficiently adheres to the adjacent layer and such that the gas barrier properties of the fabricated article are still adequate. The present invention also relates to modification of the rheology of base resins, such as PET (a preferred material for the barrier layer), so that they more closely match the rheology of high density polyethylene (a preferred material for the support layer).

L'invention concerne des objets multicouches coextrudés-soufflés améliorés (tels que des réservoirs à carburant) présentant au moins une couche barrière et une couche de support, ainsi que de nouveaux procédés de préparation de tels objets. La couche barrière comprend une quantité d'une polyoléfine modifiée ayant approximativement la même densité que la couche de support. La polyoléfine modifiée est préparée par greffage à la polyoléfine d'un acide carboxylique insaturé ou d'un dérivé dudit acide. La polyoléfine modifiée est ajoutée en quantité telle que la couche étanches aux gaz adhère suffisamment à la couche adjacente et que les propriétés de la couche étanches aux gaz de l'article fabriqué demeurent appropriées. L'invention concerne en outre la modification rhéologique de résines de base, telles que le PET (une matière préférée pour la couche barrière), qui s'adaptent ainsi plus étroitement à la rhéologie du polyéthylène à haute densité (une matière préférée pour la couche de support).

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