Seals produced from alpha-olefin/vinylidene aromatic and/or...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 23/02 (2006.01) C08F 210/00 (2006.01) C08F 212/04 (2006.01) C08L 23/08 (2006.01) C08L 25/00 (2006.01) C08L 25/08 (2006.01) C09J 123/08 (2006.01) C09K 3/10 (2006.01) C08F 210/02 (2006.01)

Patent

CA 2314994

The present invention discloses seals including container closure liners, gaskets and barrier membranes, comprising a polymer composition having an oxygen transmission coefficient at a temperature of 25 ~C of less than about 300 cm3.mil/100 in2.day.atm. (1.2 cm3/cm.day.MPa), wherein the polymer composition comprises at least one substantially random interpolymer (or a blend comprising at least one substantially random interpolymer and at least one other polymer) and from 0 to 80 percent by weight (based on the total weight of the composition) of at least one filler. The present invention also discloses sealing systems which include container closures such as bottle caps comprising these seals. The interpolymers or blends used to produce the seals of the present invention (as well as the novel seals themselves) exhibit a unique balance of properties including low oxygen permeability, low Shore A hardness and excellent tensile strain recovery.

La présente invention concerne des joints, dont des chemises pour fermeture de récipients, garnitures et membranes écran renfermant une composition polymère avec un coefficient de transmission de l'oxygène, sous une température de 25 ·C, de moins de 300 cm?3¿.mil/100 po?2¿.jour.atm. (1,2 cm?3¿/cm.jour.MPa) environ. Cette composition polymère comprend au moins un interpolymère essentiellement aléatoire (ou un mélange renfermant au moins un interpolymère essentiellement aléatoire et au moins un autre polymère) et de 0 à 80 % en poids (par rapport au poids total de la composition) d'au moins une charge. Cette invention concerne des systèmes d'étanchéité, dont des systèmes de fermeture pour récipients tels que des bouchons de bouteille dotés de tels joints. Les interpolymères ou les mélanges utilisés pour la fabrication des joints selon l'invention (ainsi que les nouveaux joints eux-mêmes) se distinguent par un remarquable dosage de propriétés diverses, dont une faible perméabilité à l'oxygène, une faible dureté Shore A et une excellente reprise élastique.

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