Polymer molding compositions

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 23/08 (2006.01)

Patent

CA 2563272

The invention relates to formulated compositions which can be easily formed into bottle caps, without the need for a liner, while still maintaining pressure requirements, such as for carbonated beverages. The compositions may include an ethylene polymer having a density in the range of from about 0.947 to 0.962 g/cm3, a melt index of from about 1 to about 10 g/10 min., and another ethylene polymer having a density in the range of from about 0.912 to 0.932 g/cm3, a melt index of from about 0.25 to about 6 g/10 min., wherein the two ethylene polymers have a density difference of equal to or greater than 0.03 g/cm3. In other cases, the composition may include a single component resin with a density in the 0.935 - 0.955 g/cm3 range with a melt index in the range of 0.3 - 1.2 g/10minutes, and wherein the resin comprises a polyethylene polymer.

Des compositions formulées pouvant être facilement préparées dans des capsules de bouteille sans qu'il soit nécessaire d'utiliser une garniture et tout en préservant les conditions requises de pression, notamment pour les boissons gazeuses. Les compositions peuvent contenir un polymère éthylène ayant une densité comprise entre environ 0,947 et 0,962 g/cm3, un indice de fluidité allant d'environ 1 à environ 10 g/10 min., et un autre polymère éthylène ayant une densité comprise entre environ 0,912 et 0,932 g/cm3, un indice de fluidité compris entre environ 0,25 et environ 6 g/10 min., les deux polymères éthylène ayant une différence de densité égale ou supérieure à 0,03 g/cm3. Dans d'autres cas, la composition peut comporter une résine à un seul composant ayant une densité comprise entre 0,935 et 0,955 g/cm3 avec un indice de fluidité allant de 0,3 à 1.2 g/10 minutes, et la résine comprend un polymère de polyéthylène.

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